vvysotskyi commented on a change in pull request #2068:
URL: https://github.com/apache/drill/pull/2068#discussion_r418995949
##
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/store/easy/json/extended/ExtendedTypeFieldFactory.java
##
@@ -0,0 +1,207 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.drill.exec.store.easy.json.extended;
+
+import org.apache.drill.common.types.TypeProtos.MinorType;
+import org.apache.drill.exec.record.metadata.MetadataUtils;
+import org.apache.drill.exec.store.easy.json.loader.BaseFieldFactory;
+import org.apache.drill.exec.store.easy.json.loader.FieldDefn;
+import org.apache.drill.exec.store.easy.json.loader.FieldFactory;
+import org.apache.drill.exec.store.easy.json.loader.JsonLoaderImpl;
+import org.apache.drill.exec.store.easy.json.parser.ElementParser;
+import org.apache.drill.exec.store.easy.json.parser.TokenIterator;
+import org.apache.drill.exec.store.easy.json.parser.ValueParser;
+import org.apache.drill.exec.store.easy.json.values.BinaryValueListener;
+import org.apache.drill.exec.store.easy.json.values.UtcDateValueListener;
+import org.apache.drill.exec.store.easy.json.values.DecimalValueListener;
+import org.apache.drill.exec.store.easy.json.values.IntervalValueListener;
+import org.apache.drill.exec.store.easy.json.values.StrictBigIntValueListener;
+import org.apache.drill.exec.store.easy.json.values.StrictDoubleValueListener;
+import org.apache.drill.exec.store.easy.json.values.StrictIntValueListener;
+import org.apache.drill.exec.store.easy.json.values.StrictStringValueListener;
+import org.apache.drill.exec.store.easy.json.values.TimeValueListener;
+import org.apache.drill.exec.store.easy.json.values.UtcTimestampValueListener;
+
+import com.fasterxml.jackson.core.JsonToken;
+
+public class ExtendedTypeFieldFactory extends BaseFieldFactory {
+
+ public ExtendedTypeFieldFactory(JsonLoaderImpl loader, FieldFactory child) {
+super(loader, child);
+ }
+
+ @Override
+ public ElementParser fieldParser(FieldDefn fieldDefn) {
+ElementParser parser = buildExtendedTypeParser(fieldDefn);
+if (parser == null) {
+ return child.fieldParser(fieldDefn);
+} else {
+ return parser;
+}
+ }
+
+ private ElementParser buildExtendedTypeParser(FieldDefn fieldDefn) {
+
+// Extended types are objects: { "$type": ... }
+// Extended arrays are [ { "$type": ...
+TokenIterator tokenizer = fieldDefn.tokenizer();
+JsonToken token = tokenizer.requireNext();
+ElementParser parser;
+switch (token) {
+ case START_OBJECT:
+parser = extendedTypeParserFor(fieldDefn, false);
+break;
+ case START_ARRAY:
+parser = arrayParserFor(fieldDefn);
+break;
+ default:
+parser = null;
+}
+tokenizer.unget(token);
+return parser;
+ }
+
+ private ElementParser arrayParserFor(FieldDefn fieldDefn) {
+TokenIterator tokenizer = fieldDefn.tokenizer();
+JsonToken token = tokenizer.requireNext();
+if (token != JsonToken.START_OBJECT) {
+ tokenizer.unget(token);
+ return null;
+}
+
+ValueParser element = extendedTypeParserFor(fieldDefn, true);
+tokenizer.unget(token);
+if (element == null) {
+ return null;
+}
+
+return scalarArrayParserFor(element);
+ }
+
+ private BaseExtendedValueParser extendedTypeParserFor(FieldDefn fieldDefn,
boolean isArray) {
+TokenIterator tokenizer = fieldDefn.tokenizer();
+JsonToken token = tokenizer.peek();
+if (token != JsonToken.FIELD_NAME) {
+ return null;
+}
+
+String key = tokenizer.textValue().trim();
+if (!key.startsWith(ExtendedTypeNames.TYPE_PREFIX)) {
+ return null;
+}
+return parserFor(fieldDefn, key, isArray);
+ }
+
+ private BaseExtendedValueParser parserFor(FieldDefn fieldDefn, String key,
boolean isArray) {
+switch (key) {
+case ExtendedTypeNames.LONG:
+ return numberLongParser(fieldDefn, isArray);
+case ExtendedTypeNames.DECIMAL:
+ return numberDecimalParser(fieldDefn, isArray);
+case ExtendedTypeNames.DOUBLE:
+ return numberDoubleParser(fieldDefn, isArray);
+case ExtendedTypeNames.INT:
+ return