Github user jinfengni commented on a diff in the pull request:
https://github.com/apache/drill/pull/512#discussion_r66894665
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/expr/fn/impl/CharSequenceWrapper.java
---
@@ -17,13 +17,52 @@
*/
package org.apache.drill.exec.expr.fn.impl;
+import java.nio.ByteBuffer;
+import java.nio.CharBuffer;
+import java.nio.charset.CharacterCodingException;
+import java.nio.charset.Charset;
+import java.nio.charset.CharsetDecoder;
+import java.nio.charset.CoderResult;
+import java.util.regex.Matcher;
+
import io.netty.buffer.DrillBuf;
+/**
+ * A CharSequence is a readable sequence of char values. This interface
provides
+ * uniform, read-only access to many different kinds of char sequences. A
char
+ * value represents a character in the Basic Multilingual Plane (BMP) or a
+ * surrogate. Refer to Unicode Character Representation for details.<br>
+ * Specifically this implementation of the CharSequence adapts a Drill
+ * {@link DrillBuf} to the CharSequence. The implementation is meant to be
+ * re-used that is allocated once and then passed DrillBuf to adapt. This
can be
+ * handy to exploit API that consume CharSequence avoiding the need to
create
+ * string objects.
+ *
+ */
public class CharSequenceWrapper implements CharSequence {
+ // The adapted drill buffer (in the case of US-ASCII)
+ private DrillBuf buffer;
+ // The converted bytes in the case of non ASCII
+ private CharBuffer charBuffer;
--- End diff --
Agreed. Make sense to use CharSequenceWrapper.
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