org.apache.hadoop.hive.serde2.DelimitedJSONSerDe Maven / Gradle / Ivy
/**
* 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.hadoop.hive.serde2;
import java.io.IOException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.hive.serde.serdeConstants;
import org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe;
import org.apache.hadoop.hive.serde2.lazy.LazySerDeParameters;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector.Category;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory;
import org.apache.hadoop.io.Writable;
/**
* DelimitedJSONSerDe.
*
* This serde can only serialize, because it is just intended for use by the FetchTask class and the
* TRANSFORM function.
*/
public class DelimitedJSONSerDe extends LazySimpleSerDe {
public static final Logger LOG = LoggerFactory.getLogger(DelimitedJSONSerDe.class.getName());
public DelimitedJSONSerDe() throws SerDeException {
}
/**
* Not implemented.
*/
@Override
public Object doDeserialize(Writable field) throws SerDeException {
LOG.error("DelimitedJSONSerDe cannot deserialize.");
throw new SerDeException("DelimitedJSONSerDe cannot deserialize.");
}
@Override
protected void serializeField(ByteStream.Output out, Object obj, ObjectInspector objInspector,
LazySerDeParameters serdeParams) throws SerDeException {
if (!objInspector.getCategory().equals(Category.PRIMITIVE) || (objInspector.getTypeName().equalsIgnoreCase(serdeConstants.BINARY_TYPE_NAME))) {
//do this for all complex types and binary
try {
serialize(out, SerDeUtils.getJSONString(obj, objInspector, serdeParams.getNullSequence().toString()),
PrimitiveObjectInspectorFactory.javaStringObjectInspector, serdeParams.getSeparators(),
1, serdeParams.getNullSequence(), serdeParams.isEscaped(), serdeParams.getEscapeChar(),
serdeParams.getNeedsEscape());
} catch (IOException e) {
throw new SerDeException(e);
}
} else {
//primitives except binary
super.serializeField(out, obj, objInspector, serdeParams);
}
}
}