[ 
https://issues.apache.org/jira/browse/ARROW-1717?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16250679#comment-16250679
 ] 

ASF GitHub Bot commented on ARROW-1717:
---------------------------------------

wesm closed pull request #1290: ARROW-1717: Refactor JsonReader
URL: https://github.com/apache/arrow/pull/1290
 
 
   

This is a PR merged from a forked repository.
As GitHub hides the original diff on merge, it is displayed below for
the sake of provenance:

As this is a foreign pull request (from a fork), the diff is supplied
below (as it won't show otherwise due to GitHub magic):

diff --git 
a/java/vector/src/main/java/org/apache/arrow/vector/BaseNullableVariableWidthVector.java
 
b/java/vector/src/main/java/org/apache/arrow/vector/BaseNullableVariableWidthVector.java
index 6587cde63..47daeee7f 100644
--- 
a/java/vector/src/main/java/org/apache/arrow/vector/BaseNullableVariableWidthVector.java
+++ 
b/java/vector/src/main/java/org/apache/arrow/vector/BaseNullableVariableWidthVector.java
@@ -909,52 +909,6 @@ protected final void handleSafe(int index, int dataLength) 
{
       }
    }
 
-
-   /******************************************************************
-    *                                                                *
-    *                helper methods currently                        *
-    *                used by JsonFileReader and                      *
-    *                JsonFileWriter                                  *
-    *                                                                *
-    ******************************************************************/
-
-
-   /**
-    * Method used by Json Reader to explicitly set the data of the variable
-    * width vector elements. The method takes care of allocating the memory
-    * for the vector if caller hasn't done so.
-    *
-    * This method should not be used externally.
-    *
-    * @param data ArrowBuf for storing variable width elements in the vector
-    * @param offset offset of the element
-    * @param allocator memory allocator
-    * @param index position of the element in the vector
-    * @param value array of bytes for the element
-    * @param valueCount number of elements in the vector
-    * @return buffer holding the variable width data.
-    */
-   public static ArrowBuf set(ArrowBuf data, ArrowBuf offset,
-                              BufferAllocator allocator, int index, byte[] 
value,
-                              int valueCount) {
-      if (data == null) {
-         data = allocator.buffer(INITIAL_BYTE_COUNT);
-      }
-      final int currentBufferCapacity = data.capacity();
-      final int currentStartOffset = offset.getInt(index * OFFSET_WIDTH);
-      while (currentBufferCapacity < currentStartOffset + value.length) {
-         final ArrowBuf newBuf = allocator.buffer(currentBufferCapacity * 2);
-         newBuf.setBytes(0, data, 0, currentBufferCapacity);
-         data.release();
-         data = newBuf;
-      }
-      data.setBytes(currentStartOffset, value, 0, value.length);
-      if (index == (valueCount - 1)) {
-         data.writerIndex(offset.getInt(valueCount * OFFSET_WIDTH));
-      }
-      return data;
-   }
-
    /**
     * Method used by Json Writer to read a variable width element from
     * the variable width vector and write to Json.
diff --git 
a/java/vector/src/main/java/org/apache/arrow/vector/NullableBigIntVector.java 
b/java/vector/src/main/java/org/apache/arrow/vector/NullableBigIntVector.java
index ee40d708c..253427333 100644
--- 
a/java/vector/src/main/java/org/apache/arrow/vector/NullableBigIntVector.java
+++ 
b/java/vector/src/main/java/org/apache/arrow/vector/NullableBigIntVector.java
@@ -34,7 +34,7 @@
  * maintained to track which elements in the vector are null.
  */
 public class NullableBigIntVector extends BaseNullableFixedWidthVector {
-   private static final byte TYPE_WIDTH = 8;
+   public static final byte TYPE_WIDTH = 8;
    private final FieldReader reader;
 
    /**
@@ -290,41 +290,6 @@ public void setSafe(int index, int isSet, long value) {
       set(index, isSet, value);
    }
 
-
-   /******************************************************************
-    *                                                                *
-    *          helper routines currently                             *
-    *          used in JsonFileReader and JsonFileWriter             *
-    *                                                                *
-    ******************************************************************/
-
-
-   /**
-    * Given a data buffer, this method sets the element value at a particular
-    * position. Reallocates the buffer if needed.
-    *
-    * This method should not be used externally.
-    *
-    * @param buffer data buffer
-    * @param allocator allocator
-    * @param valueCount number of elements in the vector
-    * @param index position of the new element
-    * @param value element value
-    * @return data buffer
-    */
-   public static ArrowBuf set(ArrowBuf buffer, BufferAllocator allocator,
-                              int valueCount, int index, long value) {
-      if (buffer == null) {
-         buffer = allocator.buffer(valueCount * TYPE_WIDTH);
-      }
-      buffer.setLong(index * TYPE_WIDTH, value);
-      if (index == (valueCount - 1)) {
-         buffer.writerIndex(valueCount * TYPE_WIDTH);
-      }
-
-      return buffer;
-   }
-
    /**
     * Given a data buffer, get the value stored at a particular position
     * in the vector.
diff --git 
a/java/vector/src/main/java/org/apache/arrow/vector/NullableDateDayVector.java 
b/java/vector/src/main/java/org/apache/arrow/vector/NullableDateDayVector.java
index 949287eca..e6b5b590f 100644
--- 
a/java/vector/src/main/java/org/apache/arrow/vector/NullableDateDayVector.java
+++ 
b/java/vector/src/main/java/org/apache/arrow/vector/NullableDateDayVector.java
@@ -292,40 +292,6 @@ public void setSafe(int index, int isSet, int value) {
       set(index, isSet, value);
    }
 
-   /******************************************************************
-    *                                                                *
-    *          helper routines currently                             *
-    *          used in JsonFileReader                                *
-    *                                                                *
-    ******************************************************************/
-
-
-   /**
-    * Given a data buffer, this method sets the element value at a particular
-    * position. Reallocates the buffer if needed.
-    *
-    * This method should not be used externally.
-    *
-    * @param buffer data buffer
-    * @param allocator allocator
-    * @param valueCount number of elements in the vector
-    * @param index position of the new element
-    * @param value element value
-    * @return data buffer
-    */
-   public static ArrowBuf set(ArrowBuf buffer, BufferAllocator allocator,
-                              int valueCount, int index, int value) {
-      if (buffer == null) {
-         buffer = allocator.buffer(valueCount * TYPE_WIDTH);
-      }
-      buffer.setInt(index * TYPE_WIDTH, value);
-      if (index == (valueCount - 1)) {
-         buffer.writerIndex(valueCount * TYPE_WIDTH);
-      }
-
-      return buffer;
-   }
-
    /**
     * Given a data buffer, get the value stored at a particular position
     * in the vector.
diff --git 
a/java/vector/src/main/java/org/apache/arrow/vector/NullableDateMilliVector.java
 
b/java/vector/src/main/java/org/apache/arrow/vector/NullableDateMilliVector.java
index a0bdccede..8e15100f7 100644
--- 
a/java/vector/src/main/java/org/apache/arrow/vector/NullableDateMilliVector.java
+++ 
b/java/vector/src/main/java/org/apache/arrow/vector/NullableDateMilliVector.java
@@ -296,40 +296,6 @@ public void setSafe(int index, int isSet, long value) {
       set(index, isSet, value);
    }
 
-   /******************************************************************
-    *                                                                *
-    *          helper routines currently                             *
-    *          used in JsonFileReader                                *
-    *                                                                *
-    ******************************************************************/
-
-
-   /**
-    * Given a data buffer, this method sets the element value at a particular
-    * position. Reallocates the buffer if needed.
-    *
-    * This method should not be used externally.
-    *
-    * @param buffer data buffer
-    * @param allocator allocator
-    * @param valueCount number of elements in the vector
-    * @param index position of the new element
-    * @param value element value
-    * @return data buffer
-    */
-   public static ArrowBuf set(ArrowBuf buffer, BufferAllocator allocator,
-                              int valueCount, int index, long value) {
-      if (buffer == null) {
-         buffer = allocator.buffer(valueCount * TYPE_WIDTH);
-      }
-      buffer.setLong(index * TYPE_WIDTH, value);
-      if (index == (valueCount - 1)) {
-         buffer.writerIndex(valueCount * TYPE_WIDTH);
-      }
-
-      return buffer;
-   }
-
    /**
     * Given a data buffer, get the value stored at a particular position
     * in the vector.
diff --git 
a/java/vector/src/main/java/org/apache/arrow/vector/NullableDecimalVector.java 
b/java/vector/src/main/java/org/apache/arrow/vector/NullableDecimalVector.java
index 8320f9083..2a611c6a2 100644
--- 
a/java/vector/src/main/java/org/apache/arrow/vector/NullableDecimalVector.java
+++ 
b/java/vector/src/main/java/org/apache/arrow/vector/NullableDecimalVector.java
@@ -37,7 +37,7 @@
  * maintained to track which elements in the vector are null.
  */
 public class NullableDecimalVector extends BaseNullableFixedWidthVector {
-   private static final byte TYPE_WIDTH = 16;
+   public static final byte TYPE_WIDTH = 16;
    private final FieldReader reader;
 
    private final int precision;
@@ -357,41 +357,6 @@ public void setSafe(int index, int isSet, int start, 
ArrowBuf buffer) {
 
    /******************************************************************
     *                                                                *
-    *          helper routines currently                             *
-    *          used in JsonFileReader                                *
-    *                                                                *
-    ******************************************************************/
-
-
-   /**
-    * Given a data buffer, this method sets the element value at a particular
-    * position. Reallocates the buffer if needed.
-    *
-    * This method should not be used externally.
-    *
-    * @param buffer data buffer
-    * @param allocator allocator
-    * @param valueCount number of elements in the vector
-    * @param index position of the new element
-    * @param value element value as array of bytes
-    * @return data buffer
-    */
-   public static ArrowBuf set(ArrowBuf buffer, BufferAllocator allocator,
-                              int valueCount, int index, byte[] value) {
-      if (buffer == null) {
-         buffer = allocator.buffer(valueCount * TYPE_WIDTH);
-      }
-      DecimalUtility.writeByteArrayToArrowBuf(value, buffer, index);
-      if (index == (valueCount - 1)) {
-         buffer.writerIndex(valueCount * TYPE_WIDTH);
-      }
-
-      return buffer;
-   }
-
-
-   /******************************************************************
-    *                                                                *
     *                      vector transfer                           *
     *                                                                *
     ******************************************************************/
diff --git 
a/java/vector/src/main/java/org/apache/arrow/vector/NullableFloat4Vector.java 
b/java/vector/src/main/java/org/apache/arrow/vector/NullableFloat4Vector.java
index 5b28065c4..3ba5cfcea 100644
--- 
a/java/vector/src/main/java/org/apache/arrow/vector/NullableFloat4Vector.java
+++ 
b/java/vector/src/main/java/org/apache/arrow/vector/NullableFloat4Vector.java
@@ -34,7 +34,7 @@
  * maintained to track which elements in the vector are null.
  */
 public class NullableFloat4Vector extends BaseNullableFixedWidthVector {
-   private static final byte TYPE_WIDTH = 4;
+   public static final byte TYPE_WIDTH = 4;
    private final FieldReader reader;
 
    /**
@@ -291,41 +291,6 @@ public void setSafe(int index, int isSet, float value) {
       set(index, isSet, value);
    }
 
-
-   /******************************************************************
-    *                                                                *
-    *          helper routines currently                             *
-    *          used in JsonFileReader and JsonFileWriter             *
-    *                                                                *
-    ******************************************************************/
-
-
-   /**
-    * Given a data buffer, this method sets the element value at a particular
-    * position. Reallocates the buffer if needed.
-    *
-    * This method should not be used externally.
-    *
-    * @param buffer data buffer
-    * @param allocator allocator
-    * @param valueCount number of elements in the vector
-    * @param index position of the new element
-    * @param value element value
-    * @return data buffer
-    */
-   public static ArrowBuf set(ArrowBuf buffer, BufferAllocator allocator,
-                              int valueCount, int index, float value) {
-      if (buffer == null) {
-         buffer = allocator.buffer(valueCount * TYPE_WIDTH);
-      }
-      buffer.setFloat(index * TYPE_WIDTH, value);
-      if (index == (valueCount - 1)) {
-         buffer.writerIndex(valueCount * TYPE_WIDTH);
-      }
-
-      return buffer;
-   }
-
    /**
     * Given a data buffer, get the value stored at a particular position
     * in the vector.
diff --git 
a/java/vector/src/main/java/org/apache/arrow/vector/NullableFloat8Vector.java 
b/java/vector/src/main/java/org/apache/arrow/vector/NullableFloat8Vector.java
index 624abf2f2..2fb96a44f 100644
--- 
a/java/vector/src/main/java/org/apache/arrow/vector/NullableFloat8Vector.java
+++ 
b/java/vector/src/main/java/org/apache/arrow/vector/NullableFloat8Vector.java
@@ -34,7 +34,7 @@
  * maintained to track which elements in the vector are null.
  */
 public class NullableFloat8Vector extends BaseNullableFixedWidthVector {
-   private static final byte TYPE_WIDTH = 8;
+   public static final byte TYPE_WIDTH = 8;
    private final FieldReader reader;
 
    /**
@@ -291,41 +291,6 @@ public void setSafe(int index, int isSet, double value) {
       set(index, isSet, value);
    }
 
-
-   /******************************************************************
-    *                                                                *
-    *          helper routines currently                             *
-    *          used in JsonFileReader and JsonFileWriter             *
-    *                                                                *
-    ******************************************************************/
-
-
-   /**
-    * Given a data buffer, this method sets the element value at a particular
-    * position. Reallocates the buffer if needed.
-    *
-    * This method should not be used externally.
-    *
-    * @param buffer data buffer
-    * @param allocator allocator
-    * @param valueCount number of elements in the vector
-    * @param index position of the new element
-    * @param value element value
-    * @return data buffer
-    */
-   public static ArrowBuf set(ArrowBuf buffer, BufferAllocator allocator,
-                              int valueCount, int index, double value) {
-      if (buffer == null) {
-         buffer = allocator.buffer(valueCount * TYPE_WIDTH);
-      }
-      buffer.setDouble(index * TYPE_WIDTH, value);
-      if (index == (valueCount - 1)) {
-         buffer.writerIndex(valueCount * TYPE_WIDTH);
-      }
-
-      return buffer;
-   }
-
    /**
     * Given a data buffer, get the value stored at a particular position
     * in the vector.
diff --git 
a/java/vector/src/main/java/org/apache/arrow/vector/NullableIntVector.java 
b/java/vector/src/main/java/org/apache/arrow/vector/NullableIntVector.java
index 6311daf4f..93deacbdf 100644
--- a/java/vector/src/main/java/org/apache/arrow/vector/NullableIntVector.java
+++ b/java/vector/src/main/java/org/apache/arrow/vector/NullableIntVector.java
@@ -34,7 +34,7 @@
  * maintained to track which elements in the vector are null.
  */
 public class NullableIntVector extends BaseNullableFixedWidthVector {
-   private static final byte TYPE_WIDTH = 4;
+   public static final byte TYPE_WIDTH = 4;
    private final FieldReader reader;
 
    /**
@@ -291,40 +291,6 @@ public void setSafe(int index, int isSet, int value) {
       set(index, isSet, value);
    }
 
-   /******************************************************************
-    *                                                                *
-    *          helper routines currently                             *
-    *          used in JsonFileReader and JsonFileWriter             *
-    *                                                                *
-    ******************************************************************/
-
-
-   /**
-    * Given a data buffer, this method sets the element value at a particular
-    * position. Reallocates the buffer if needed.
-    *
-    * This method should not be used externally.
-    *
-    * @param buffer data buffer
-    * @param allocator allocator
-    * @param valueCount number of elements in the vector
-    * @param index position of the new element
-    * @param value element value
-    * @return data buffer
-    */
-   public static ArrowBuf set(ArrowBuf buffer, BufferAllocator allocator,
-                              int valueCount, int index, int value) {
-      if (buffer == null) {
-         buffer = allocator.buffer(valueCount * TYPE_WIDTH);
-      }
-      buffer.setInt(index * TYPE_WIDTH, value);
-      if (index == (valueCount - 1)) {
-         buffer.writerIndex(valueCount * TYPE_WIDTH);
-      }
-
-      return buffer;
-   }
-
    /**
     * Given a data buffer, get the value stored at a particular position
     * in the vector.
diff --git 
a/java/vector/src/main/java/org/apache/arrow/vector/NullableSmallIntVector.java 
b/java/vector/src/main/java/org/apache/arrow/vector/NullableSmallIntVector.java
index c45a8d5f5..ed337188b 100644
--- 
a/java/vector/src/main/java/org/apache/arrow/vector/NullableSmallIntVector.java
+++ 
b/java/vector/src/main/java/org/apache/arrow/vector/NullableSmallIntVector.java
@@ -34,7 +34,7 @@
  * maintained to track which elements in the vector are null.
  */
 public class NullableSmallIntVector extends BaseNullableFixedWidthVector {
-   private static final byte TYPE_WIDTH = 2;
+   public static final byte TYPE_WIDTH = 2;
    private final FieldReader reader;
 
    /**
@@ -319,41 +319,6 @@ public void setSafe(int index, int isSet, short value) {
       set(index, isSet, value);
    }
 
-
-   /******************************************************************
-    *                                                                *
-    *          helper routines currently                             *
-    *          used in JsonFileReader and JsonFileWriter             *
-    *                                                                *
-    ******************************************************************/
-
-
-   /**
-    * Given a data buffer, this method sets the element value at a particular
-    * position. Reallocates the buffer if needed.
-    *
-    * This method should not be used externally.
-    *
-    * @param buffer data buffer
-    * @param allocator allocator
-    * @param valueCount number of elements in the vector
-    * @param index position of the new element
-    * @param value element value
-    * @return data buffer
-    */
-   public static ArrowBuf set(ArrowBuf buffer, BufferAllocator allocator,
-                              int valueCount, int index, short value) {
-      if (buffer == null) {
-         buffer = allocator.buffer(valueCount * TYPE_WIDTH);
-      }
-      buffer.setShort(index * TYPE_WIDTH, value);
-      if (index == (valueCount - 1)) {
-         buffer.writerIndex(valueCount * TYPE_WIDTH);
-      }
-
-      return buffer;
-   }
-
    /**
     * Given a data buffer, get the value stored at a particular position
     * in the vector.
diff --git 
a/java/vector/src/main/java/org/apache/arrow/vector/NullableTimeMicroVector.java
 
b/java/vector/src/main/java/org/apache/arrow/vector/NullableTimeMicroVector.java
index 454a4ac41..d7ea32223 100644
--- 
a/java/vector/src/main/java/org/apache/arrow/vector/NullableTimeMicroVector.java
+++ 
b/java/vector/src/main/java/org/apache/arrow/vector/NullableTimeMicroVector.java
@@ -292,40 +292,6 @@ public void setSafe(int index, int isSet, long value) {
       set(index, isSet, value);
    }
 
-
-   /******************************************************************
-    *                                                                *
-    *          helper routines currently                             *
-    *          used in JsonFileReader and JsonFileWriter             *
-    *                                                                *
-    ******************************************************************/
-
-   /**
-    * Given a data buffer, this method sets the element value at a particular
-    * position. Reallocates the buffer if needed.
-    *
-    * This method should not be used externally.
-    *
-    * @param buffer data buffer
-    * @param allocator allocator
-    * @param valueCount number of elements in the vector
-    * @param index position of the new element
-    * @param value element value
-    * @return data buffer
-    */
-   public static ArrowBuf set(ArrowBuf buffer, BufferAllocator allocator,
-                              int valueCount, int index, long value) {
-      if (buffer == null) {
-         buffer = allocator.buffer(valueCount * TYPE_WIDTH);
-      }
-      buffer.setLong(index * TYPE_WIDTH, value);
-      if (index == (valueCount - 1)) {
-         buffer.writerIndex(valueCount * TYPE_WIDTH);
-      }
-
-      return buffer;
-   }
-
    /**
     * Given a data buffer, get the value stored at a particular position
     * in the vector.
diff --git 
a/java/vector/src/main/java/org/apache/arrow/vector/NullableTimeMilliVector.java
 
b/java/vector/src/main/java/org/apache/arrow/vector/NullableTimeMilliVector.java
index 8540d1692..07d8abba4 100644
--- 
a/java/vector/src/main/java/org/apache/arrow/vector/NullableTimeMilliVector.java
+++ 
b/java/vector/src/main/java/org/apache/arrow/vector/NullableTimeMilliVector.java
@@ -294,40 +294,6 @@ public void setSafe(int index, int isSet, int value) {
    }
 
 
-   /******************************************************************
-    *                                                                *
-    *          helper routines currently                             *
-    *          used in JsonFileReader and JsonFileWriter             *
-    *                                                                *
-    ******************************************************************/
-
-
-   /**
-    * Given a data buffer, this method sets the element value at a particular
-    * position. Reallocates the buffer if needed.
-    *
-    * This method should not be used externally.
-    *
-    * @param buffer data buffer
-    * @param allocator allocator
-    * @param valueCount number of elements in the vector
-    * @param index position of the new element
-    * @param value element value
-    * @return data buffer
-    */
-   public static ArrowBuf set(ArrowBuf buffer, BufferAllocator allocator,
-                              int valueCount, int index, int value) {
-      if (buffer == null) {
-         buffer = allocator.buffer(valueCount * TYPE_WIDTH);
-      }
-      buffer.setInt(index * TYPE_WIDTH, value);
-      if (index == (valueCount - 1)) {
-         buffer.writerIndex(valueCount * TYPE_WIDTH);
-      }
-
-      return buffer;
-   }
-
    /**
     * Given a data buffer, get the value stored at a particular position
     * in the vector.
diff --git 
a/java/vector/src/main/java/org/apache/arrow/vector/NullableTimeNanoVector.java 
b/java/vector/src/main/java/org/apache/arrow/vector/NullableTimeNanoVector.java
index 015226da2..947b2392f 100644
--- 
a/java/vector/src/main/java/org/apache/arrow/vector/NullableTimeNanoVector.java
+++ 
b/java/vector/src/main/java/org/apache/arrow/vector/NullableTimeNanoVector.java
@@ -291,40 +291,6 @@ public void setSafe(int index, int isSet, long value) {
       set(index, isSet, value);
    }
 
-
-   /******************************************************************
-    *                                                                *
-    *          helper routines currently                             *
-    *          used in JsonFileReader and JsonFileWriter             *
-    *                                                                *
-    ******************************************************************/
-
-   /**
-    * Given a data buffer, this method sets the element value at a particular
-    * position. Reallocates the buffer if needed.
-    *
-    * This method should not be used externally.
-    *
-    * @param buffer data buffer
-    * @param allocator allocator
-    * @param valueCount number of elements in the vector
-    * @param index position of the new element
-    * @param value element value
-    * @return data buffer
-    */
-   public static ArrowBuf set(ArrowBuf buffer, BufferAllocator allocator,
-                              int valueCount, int index, long value) {
-      if (buffer == null) {
-         buffer = allocator.buffer(valueCount * TYPE_WIDTH);
-      }
-      buffer.setLong(index * TYPE_WIDTH, value);
-      if (index == (valueCount - 1)) {
-         buffer.writerIndex(valueCount * TYPE_WIDTH);
-      }
-
-      return buffer;
-   }
-
    /**
     * Given a data buffer, get the value stored at a particular position
     * in the vector.
diff --git 
a/java/vector/src/main/java/org/apache/arrow/vector/NullableTimeSecVector.java 
b/java/vector/src/main/java/org/apache/arrow/vector/NullableTimeSecVector.java
index 2b2375e92..0a3cfaac0 100644
--- 
a/java/vector/src/main/java/org/apache/arrow/vector/NullableTimeSecVector.java
+++ 
b/java/vector/src/main/java/org/apache/arrow/vector/NullableTimeSecVector.java
@@ -291,40 +291,6 @@ public void setSafe(int index, int isSet, int value) {
       set(index, isSet, value);
    }
 
-   /******************************************************************
-    *                                                                *
-    *          helper routines currently                             *
-    *          used in JsonFileReader and JsonFileWriter             *
-    *                                                                *
-    ******************************************************************/
-
-
-   /**
-    * Given a data buffer, this method sets the element value at a particular
-    * position. Reallocates the buffer if needed.
-    *
-    * This method should not be used externally.
-    *
-    * @param buffer data buffer
-    * @param allocator allocator
-    * @param valueCount number of elements in the vector
-    * @param index position of the new element
-    * @param value element value
-    * @return data buffer
-    */
-   public static ArrowBuf set(ArrowBuf buffer, BufferAllocator allocator,
-                              int valueCount, int index, int value) {
-      if (buffer == null) {
-         buffer = allocator.buffer(valueCount * TYPE_WIDTH);
-      }
-      buffer.setInt(index * TYPE_WIDTH, value);
-      if (index == (valueCount - 1)) {
-         buffer.writerIndex(valueCount * TYPE_WIDTH);
-      }
-
-      return buffer;
-   }
-
    /**
     * Given a data buffer, get the value stored at a particular position
     * in the vector.
diff --git 
a/java/vector/src/main/java/org/apache/arrow/vector/NullableTimeStampVector.java
 
b/java/vector/src/main/java/org/apache/arrow/vector/NullableTimeStampVector.java
index b2a58bd45..1bf2abc38 100644
--- 
a/java/vector/src/main/java/org/apache/arrow/vector/NullableTimeStampVector.java
+++ 
b/java/vector/src/main/java/org/apache/arrow/vector/NullableTimeStampVector.java
@@ -165,42 +165,6 @@ public void setSafe(int index, int isSet, long value) {
       set(index, isSet, value);
    }
 
-
-   /******************************************************************
-    *                                                                *
-    *          helper routines currently                             *
-    *          used in JsonFileReader and                            *
-    *          JsonFileWriter                                        *
-    *                                                                *
-    ******************************************************************/
-
-
-   /**
-    * Given a data buffer, this method sets the element value at a particular
-    * position. Reallocates the buffer if needed.
-    *
-    * This method should not be used externally.
-    *
-    * @param buffer data buffer
-    * @param allocator allocator
-    * @param valueCount number of elements in the vector
-    * @param index position of the new element
-    * @param value element value
-    * @return data buffer
-    */
-   public static ArrowBuf set(ArrowBuf buffer, BufferAllocator allocator,
-                              int valueCount, int index, long value) {
-      if (buffer == null) {
-         buffer = allocator.buffer(valueCount * TYPE_WIDTH);
-      }
-      buffer.setLong(index * TYPE_WIDTH, value);
-      if (index == (valueCount - 1)) {
-         buffer.writerIndex(valueCount * TYPE_WIDTH);
-      }
-
-      return buffer;
-   }
-
    /**
     * Given a data buffer, get the value stored at a particular position
     * in the vector.
diff --git 
a/java/vector/src/main/java/org/apache/arrow/vector/NullableTinyIntVector.java 
b/java/vector/src/main/java/org/apache/arrow/vector/NullableTinyIntVector.java
index 15100530d..ccbfa32b8 100644
--- 
a/java/vector/src/main/java/org/apache/arrow/vector/NullableTinyIntVector.java
+++ 
b/java/vector/src/main/java/org/apache/arrow/vector/NullableTinyIntVector.java
@@ -318,42 +318,6 @@ public void setSafe(int index, int isSet, byte value) {
       set(index, isSet, value);
    }
 
-
-
-   /******************************************************************
-    *                                                                *
-    *          helper routines currently                             *
-    *          used in JsonFileReader and JsonFileWriter             *
-    *                                                                *
-    ******************************************************************/
-
-
-   /**
-    * Given a data buffer, this method sets the element value at a particular
-    * position. Reallocates the buffer if needed.
-    *
-    * This method should not be used externally.
-    *
-    * @param buffer data buffer
-    * @param allocator allocator
-    * @param valueCount number of elements in the vector
-    * @param index position of the new element
-    * @param value element value
-    * @return data buffer
-    */
-   public static ArrowBuf set(ArrowBuf buffer, BufferAllocator allocator,
-                              int valueCount, int index, byte value) {
-      if (buffer == null) {
-         buffer = allocator.buffer(valueCount * TYPE_WIDTH);
-      }
-      buffer.setByte(index * TYPE_WIDTH, value);
-      if (index == (valueCount - 1)) {
-         buffer.writerIndex(valueCount * TYPE_WIDTH);
-      }
-
-      return buffer;
-   }
-
    /**
     * Given a data buffer, get the value stored at a particular position
     * in the vector.
diff --git 
a/java/vector/src/main/java/org/apache/arrow/vector/file/json/JsonFileReader.java
 
b/java/vector/src/main/java/org/apache/arrow/vector/file/json/JsonFileReader.java
index c6a82510e..560b0b9c5 100644
--- 
a/java/vector/src/main/java/org/apache/arrow/vector/file/json/JsonFileReader.java
+++ 
b/java/vector/src/main/java/org/apache/arrow/vector/file/json/JsonFileReader.java
@@ -27,15 +27,17 @@
 
 import java.io.File;
 import java.io.IOException;
+import java.nio.charset.Charset;
 import java.util.*;
 
 import com.google.common.collect.ImmutableList;
+import com.google.common.collect.Lists;
 import io.netty.buffer.ArrowBuf;
 import org.apache.arrow.memory.BufferAllocator;
 import org.apache.arrow.vector.*;
-import org.apache.arrow.vector.complex.ListVector;
 import org.apache.arrow.vector.dictionary.Dictionary;
 import org.apache.arrow.vector.dictionary.DictionaryProvider;
+import org.apache.arrow.vector.file.InvalidArrowFileException;
 import org.apache.arrow.vector.schema.ArrowFieldNode;
 import org.apache.arrow.vector.schema.ArrowVectorType;
 import org.apache.arrow.vector.types.Types;
@@ -183,6 +185,282 @@ public VectorSchemaRoot read() throws IOException {
     }
   }
 
+  private abstract class BufferReader {
+    abstract protected ArrowBuf read(BufferAllocator allocator, int count) 
throws IOException;
+
+    final ArrowBuf readBuffer(BufferAllocator allocator, int count) throws 
IOException {
+      readToken(START_ARRAY);
+      ArrowBuf buf = read(allocator, count);
+      readToken(END_ARRAY);
+      return buf;
+    }
+  }
+
+  private class BufferHelper {
+     BufferReader BIT = new BufferReader() {
+
+      @Override
+      protected ArrowBuf read(BufferAllocator allocator, int count) throws 
IOException {
+        final int bufferSize = BitVectorHelper.getValidityBufferSize(count);
+        ArrowBuf buf = allocator.buffer(bufferSize);
+
+        // C++ integration test fails without this.
+        buf.setZero(0, bufferSize);
+
+        for (int i = 0; i < count; i++) {
+          parser.nextToken();
+          BitVectorHelper.setValidityBit(buf, i, 
parser.readValueAs(Boolean.class) ? 1 : 0);
+        }
+
+        return buf;
+      }
+    };
+
+    BufferReader INT1 = new BufferReader() {
+      @Override
+      protected ArrowBuf read(BufferAllocator allocator, int count) throws 
IOException {
+        ArrowBuf buf = allocator.buffer(count * 
NullableTinyIntVector.TYPE_WIDTH);
+
+        for (int i = 0; i < count; i++) {
+          parser.nextToken();
+          buf.writeByte(parser.getByteValue());
+        }
+
+        return buf;
+      }
+    };
+
+    BufferReader INT2 = new BufferReader() {
+      @Override
+      protected ArrowBuf read(BufferAllocator allocator, int count) throws 
IOException {
+        ArrowBuf buf = allocator.buffer(count * 
NullableSmallIntVector.TYPE_WIDTH);
+
+        for (int i = 0; i < count; i++) {
+          parser.nextToken();
+          buf.writeShort(parser.getShortValue());
+        }
+
+        return buf;
+      }
+    };
+
+    BufferReader INT4 = new BufferReader() {
+
+      @Override
+      protected ArrowBuf read(BufferAllocator allocator, int count) throws 
IOException {
+        ArrowBuf buf = allocator.buffer(count * NullableIntVector.TYPE_WIDTH);
+
+        for (int i = 0; i < count; i++) {
+          parser.nextToken();
+          buf.writeInt(parser.getIntValue());
+        }
+
+        return buf;
+      }
+    };
+
+    BufferReader INT8 = new BufferReader() {
+
+      @Override
+      protected ArrowBuf read(BufferAllocator allocator, int count) throws 
IOException {
+        ArrowBuf buf = allocator.buffer(count * 
NullableBigIntVector.TYPE_WIDTH);
+
+        for (int i = 0; i < count; i++) {
+          parser.nextToken();
+          buf.writeLong(parser.getLongValue());
+        }
+
+        return buf;
+      }
+    };
+
+    BufferReader FLOAT4 = new BufferReader() {
+
+      @Override
+      protected ArrowBuf read(BufferAllocator allocator, int count) throws 
IOException {
+        ArrowBuf buf = allocator.buffer(count * 
NullableFloat4Vector.TYPE_WIDTH);
+
+        for (int i = 0; i < count; i++) {
+          parser.nextToken();
+          buf.writeFloat(parser.getFloatValue());
+        }
+
+        return buf;
+      }
+    };
+
+    BufferReader FLOAT8 = new BufferReader() {
+
+      @Override
+      protected ArrowBuf read(BufferAllocator allocator, int count) throws 
IOException {
+        ArrowBuf buf = allocator.buffer(count * 
NullableFloat8Vector.TYPE_WIDTH);
+
+        for (int i = 0; i < count; i++) {
+          parser.nextToken();
+          buf.writeDouble(parser.getDoubleValue());
+        }
+
+        return buf;
+      }
+    };
+
+    BufferReader DECIMAL = new BufferReader() {
+
+      @Override
+      protected ArrowBuf read(BufferAllocator allocator, int count) throws 
IOException {
+        ArrowBuf buf = allocator.buffer(count * 
NullableDecimalVector.TYPE_WIDTH);
+
+        for (int i = 0; i < count; i++) {
+          parser.nextToken();
+          final byte[] value = decodeHexSafe(parser.getValueAsString());
+          DecimalUtility.writeByteArrayToArrowBuf(value, buf, i);
+        }
+
+        return buf;
+      }
+    };
+
+    BufferReader VARCHAR = new BufferReader() {
+      @Override
+      protected ArrowBuf read(BufferAllocator allocator, int count) throws 
IOException {
+        ArrayList<byte[]> values = Lists.newArrayList();
+        int bufferSize = 0;
+        for (int i = 0; i < count; i++) {
+          parser.nextToken();
+          final byte[] value = parser.getValueAsString().getBytes(UTF_8);
+          values.add(value);
+          bufferSize += value.length;
+
+        }
+
+        ArrowBuf buf = allocator.buffer(bufferSize);
+
+        for (byte[] value : values) {
+          buf.writeBytes(value);
+        }
+
+        return buf;
+      }
+    };
+
+    BufferReader VARBINARY = new BufferReader() {
+      @Override
+      protected ArrowBuf read(BufferAllocator allocator, int count) throws 
IOException {
+        ArrayList<byte[]> values = Lists.newArrayList();
+        int bufferSize = 0;
+        for (int i = 0; i < count; i++) {
+          parser.nextToken();
+          final byte[] value = decodeHexSafe(parser.readValueAs(String.class));
+          values.add(value);
+          bufferSize += value.length;
+
+        }
+
+        ArrowBuf buf = allocator.buffer(bufferSize);
+
+        for (byte[] value : values) {
+          buf.writeBytes(value);
+        }
+
+        return buf;
+      }
+    };
+
+  }
+
+  private ArrowBuf readBuffer(BufferAllocator allocator, ArrowVectorType 
bufferType, Types.MinorType type, int count) throws IOException {
+    ArrowBuf buf;
+
+    BufferHelper helper = new BufferHelper();
+
+    BufferReader reader = null;
+
+    if (bufferType.equals(VALIDITY)) {
+      reader = helper.BIT;
+    } else if (bufferType.equals(OFFSET)) {
+      reader = helper.INT4;
+    } else if (bufferType.equals(TYPE)) {
+      reader = helper.INT1;
+    } else if (bufferType.equals(DATA)) {
+      switch (type) {
+        case BIT:
+          reader = helper.BIT;
+          break;
+        case TINYINT:
+          reader = helper.INT1;
+          break;
+        case SMALLINT:
+          reader = helper.INT2;
+          break;
+        case INT:
+          reader = helper.INT4;
+          break;
+        case BIGINT:
+          reader = helper.INT8;
+          break;
+        case UINT1:
+          reader = helper.INT1;
+          break;
+        case UINT2:
+          reader = helper.INT2;
+          break;
+        case UINT4:
+          reader = helper.INT4;
+          break;
+        case UINT8:
+          reader = helper.INT8;
+          break;
+        case FLOAT4:
+          reader = helper.FLOAT4;
+          break;
+        case FLOAT8:
+          reader = helper.FLOAT8;
+          break;
+        case DECIMAL:
+          reader = helper.DECIMAL;
+          break;
+        case VARCHAR:
+          reader = helper.VARCHAR;
+          break;
+        case VARBINARY:
+          reader = helper.VARBINARY;
+          break;
+        case DATEDAY:
+          reader = helper.INT4;
+          break;
+        case DATEMILLI:
+          reader = helper.INT8;
+          break;
+        case TIMESEC:
+        case TIMEMILLI:
+          reader = helper.INT4;
+          break;
+        case TIMEMICRO:
+        case TIMENANO:
+          reader = helper.INT8;
+          break;
+        case TIMESTAMPNANO:
+        case TIMESTAMPMICRO:
+        case TIMESTAMPMILLI:
+        case TIMESTAMPSEC:
+        case TIMESTAMPNANOTZ:
+        case TIMESTAMPMICROTZ:
+        case TIMESTAMPMILLITZ:
+        case TIMESTAMPSECTZ:
+          reader = helper.INT8;
+          break;
+        default:
+          throw new UnsupportedOperationException("Cannot read array of type " 
+ type);
+      }
+    } else {
+      throw new InvalidArrowFileException("Unrecognized buffer type " + 
bufferType);
+    }
+
+    buf = reader.readBuffer(allocator, count);
+    assert buf != null;
+    return buf;
+  }
+
   private void readFromJsonIntoVector(Field field, FieldVector vector) throws 
JsonParseException, IOException {
     List<ArrowVectorType> vectorTypes = field.getTypeLayout().getVectorTypes();
     ArrowBuf[] vectorBuffers = new ArrowBuf[vectorTypes.size()];
@@ -209,7 +487,7 @@ private void readFromJsonIntoVector(Field field, 
FieldVector vector) throws Json
         throw new IllegalArgumentException("Expected field " + field.getName() 
+ " but got " + name);
       }
 
-      /* Initialize the vector with required capacity but don't allocate since 
we would
+      /* Initialize the vector with required capacity but don't allocateNew 
since we would
        * be doing loadFieldBuffers.
        */
       int valueCount = readNextField("count", Integer.class);
@@ -218,29 +496,13 @@ private void readFromJsonIntoVector(Field field, 
FieldVector vector) throws Json
       for (int v = 0; v < vectorTypes.size(); v++) {
         ArrowVectorType vectorType = vectorTypes.get(v);
         nextFieldIs(vectorType.getName());
-        readToken(START_ARRAY);
         int innerBufferValueCount = valueCount;
         if (vectorType.equals(OFFSET)) {
           /* offset buffer has 1 additional value capacity */
           innerBufferValueCount = valueCount + 1;
         }
-        for (int i = 0; i < innerBufferValueCount; i++) {
-          /* write data to the buffer */
-          parser.nextToken();
-          /* for variable width vectors, value count doesn't help 
pre-determining the capacity of
-           * the underlying data buffer. So we need to pass down the offset 
buffer (which was already
-           * populated in the previous iteration of this loop).
-           */
-          if (vectorType.equals(DATA) && (vector.getMinorType() == 
Types.MinorType.VARCHAR
-                  || vector.getMinorType() == Types.MinorType.VARBINARY)) {
-            vectorBuffers[v] = setValueFromParser(vectorType, vector, 
vectorBuffers[v],
-                    vectorBuffers[v-1], i, innerBufferValueCount);
-          } else {
-            vectorBuffers[v] = setValueFromParser(vectorType, vector, 
vectorBuffers[v],
-                    null, i, innerBufferValueCount);
-          }
-        }
-        readToken(END_ARRAY);
+
+        vectorBuffers[v] = readBuffer(allocator, vectorType, 
vector.getMinorType(), innerBufferValueCount);
       }
 
       vector.loadFieldBuffers(new ArrowFieldNode(valueCount, 0), 
Arrays.asList(vectorBuffers));
@@ -250,7 +512,8 @@ private void readFromJsonIntoVector(Field field, 
FieldVector vector) throws Json
       if (!fields.isEmpty()) {
         List<FieldVector> vectorChildren = vector.getChildrenFromFields();
         if (fields.size() != vectorChildren.size()) {
-          throw new IllegalArgumentException("fields and children are not the 
same size: " + fields.size() + " != " + vectorChildren.size());
+          throw new IllegalArgumentException(
+                  "fields and children are not the same size: " + 
fields.size() + " != " + vectorChildren.size());
         }
         nextFieldIs("children");
         readToken(START_ARRAY);
@@ -277,125 +540,6 @@ private void readFromJsonIntoVector(Field field, 
FieldVector vector) throws Json
     }
   }
 
-  private ArrowBuf setValueFromParser(ArrowVectorType bufferType, FieldVector 
vector,
-                                      ArrowBuf buffer, ArrowBuf offsetBuffer, 
int index, int valueCount) throws IOException {
-    if (bufferType.equals(TYPE)) {
-      buffer = NullableTinyIntVector.set(buffer, allocator,
-              valueCount, index, parser.readValueAs(Byte.class));
-    } else if (bufferType.equals(OFFSET)) {
-      buffer = BaseNullableVariableWidthVector.set(buffer, allocator,
-              valueCount, index, parser.readValueAs(Integer.class));
-    } else if (bufferType.equals(VALIDITY)) {
-      buffer = BitVectorHelper.setValidityBit(buffer, allocator,
-              valueCount, index, parser.readValueAs(Boolean.class) ? 1 : 0);
-    } else if (bufferType.equals(DATA)) {
-      switch (vector.getMinorType()) {
-        case BIT:
-          buffer = BitVectorHelper.setValidityBit(buffer, allocator,
-                  valueCount, index, parser.readValueAs(Boolean.class) ? 1 : 
0);
-          break;
-        case TINYINT:
-          buffer = NullableTinyIntVector.set(buffer, allocator,
-                  valueCount, index, parser.readValueAs(Byte.class));
-          break;
-        case SMALLINT:
-          buffer = NullableSmallIntVector.set(buffer, allocator,
-                  valueCount, index, parser.readValueAs(Short.class));
-          break;
-        case INT:
-          buffer = NullableIntVector.set(buffer, allocator,
-                  valueCount, index, parser.readValueAs(Integer.class));
-          break;
-        case BIGINT:
-          buffer = NullableBigIntVector.set(buffer, allocator,
-                  valueCount, index, parser.readValueAs(Long.class));
-          break;
-        case FLOAT4:
-          buffer = NullableFloat4Vector.set(buffer, allocator,
-                  valueCount, index, parser.readValueAs(Float.class));
-          break;
-        case FLOAT8:
-          buffer = NullableFloat8Vector.set(buffer, allocator,
-                  valueCount, index, parser.readValueAs(Double.class));
-          break;
-        case DECIMAL:
-          buffer = NullableDecimalVector.set(buffer, allocator,
-                  valueCount, index, 
decodeHexSafe(parser.readValueAs(String.class)));
-          break;
-        case VARBINARY:
-          assert (offsetBuffer != null);
-          buffer = BaseNullableVariableWidthVector.set(buffer, offsetBuffer, 
allocator, index,
-                  decodeHexSafe(parser.readValueAs(String.class)), valueCount);
-          break;
-        case VARCHAR:
-          assert (offsetBuffer != null);
-          buffer = BaseNullableVariableWidthVector.set(buffer, offsetBuffer, 
allocator, index,
-                  parser.readValueAs(String.class).getBytes(UTF_8), 
valueCount);
-          break;
-        case DATEDAY:
-          buffer = NullableDateDayVector.set(buffer, allocator,
-                  valueCount, index, parser.readValueAs(Integer.class));
-          break;
-        case DATEMILLI:
-          buffer = NullableDateMilliVector.set(buffer, allocator,
-                  valueCount, index, parser.readValueAs(Long.class));
-          break;
-        case TIMESEC:
-          buffer = NullableTimeSecVector.set(buffer, allocator,
-                  valueCount, index, parser.readValueAs(Integer.class));
-          break;
-        case TIMEMILLI:
-          buffer = NullableTimeMilliVector.set(buffer, allocator,
-                  valueCount, index, parser.readValueAs(Integer.class));
-          break;
-        case TIMEMICRO:
-          buffer = NullableTimeMicroVector.set(buffer, allocator,
-                  valueCount, index, parser.readValueAs(Long.class));
-          break;
-        case TIMENANO:
-          buffer = NullableTimeNanoVector.set(buffer, allocator,
-                  valueCount, index, parser.readValueAs(Long.class));
-          break;
-        case TIMESTAMPSEC:
-          buffer = NullableTimeStampSecVector.set(buffer, allocator,
-                  valueCount, index, parser.readValueAs(Long.class));
-          break;
-        case TIMESTAMPMILLI:
-          buffer = NullableTimeStampMilliVector.set(buffer, allocator,
-                  valueCount, index, parser.readValueAs(Long.class));
-          break;
-        case TIMESTAMPMICRO:
-          buffer = NullableTimeStampMicroVector.set(buffer, allocator,
-                  valueCount, index, parser.readValueAs(Long.class));
-          break;
-        case TIMESTAMPNANO:
-          buffer = NullableTimeStampNanoVector.set(buffer, allocator,
-                  valueCount, index, parser.readValueAs(Long.class));
-          break;
-        case TIMESTAMPSECTZ:
-          buffer = NullableTimeStampSecTZVector.set(buffer, allocator,
-                  valueCount, index, parser.readValueAs(Long.class));
-          break;
-        case TIMESTAMPMILLITZ:
-          buffer = NullableTimeStampMilliTZVector.set(buffer, allocator,
-                  valueCount, index, parser.readValueAs(Long.class));
-          break;
-        case TIMESTAMPMICROTZ:
-          buffer = NullableTimeStampMicroTZVector.set(buffer, allocator,
-                  valueCount, index, parser.readValueAs(Long.class));
-          break;
-        case TIMESTAMPNANOTZ:
-          buffer = NullableTimeStampNanoTZVector.set(buffer, allocator,
-                  valueCount, index, parser.readValueAs(Long.class));
-          break;
-        default:
-          throw new UnsupportedOperationException("minor type: " + 
vector.getMinorType());
-      }
-    }
-
-    return buffer;
-  }
-
   @Override
   public void close() throws IOException {
     parser.close();


 

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> [Java] Remove public static helper method in vector classes for 
> JSONReader/Writer
> ---------------------------------------------------------------------------------
>
>                 Key: ARROW-1717
>                 URL: https://issues.apache.org/jira/browse/ARROW-1717
>             Project: Apache Arrow
>          Issue Type: Sub-task
>            Reporter: Li Jin
>            Assignee: Li Jin
>              Labels: pull-request-available
>             Fix For: 0.8.0
>
>




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