org.elasticsearch.hadoop.mr.WritableValueWriter Maven / Gradle / Ivy
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* 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
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* specific language governing permissions and limitations
* under the License.
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package org.elasticsearch.hadoop.mr;
import java.util.Map;
import java.util.Map.Entry;
import org.apache.hadoop.io.AbstractMapWritable;
import org.apache.hadoop.io.ArrayWritable;
import org.apache.hadoop.io.BooleanWritable;
import org.apache.hadoop.io.ByteWritable;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.DoubleWritable;
import org.apache.hadoop.io.FloatWritable;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.MD5Hash;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.UTF8;
import org.apache.hadoop.io.VIntWritable;
import org.apache.hadoop.io.VLongWritable;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableUtils;
import org.elasticsearch.hadoop.serialization.Generator;
import org.elasticsearch.hadoop.serialization.builder.FilteringValueWriter;
public class WritableValueWriter extends FilteringValueWriter {
private final boolean writeUnknownTypes;
public WritableValueWriter() {
writeUnknownTypes = false;
}
public WritableValueWriter(boolean writeUnknownTypes) {
this.writeUnknownTypes = writeUnknownTypes;
}
@Override
@SuppressWarnings({ "unchecked", "deprecation" })
public Result write(Writable writable, Generator generator) {
if (writable == null || writable instanceof NullWritable) {
generator.writeNull();
}
else if (writable instanceof Text) {
Text text = (Text) writable;
generator.writeUTF8String(text.getBytes(), 0, text.getLength());
}
else if (writable instanceof UTF8) {
UTF8 utf8 = (UTF8) writable;
generator.writeUTF8String(utf8.getBytes(), 0, utf8.getLength());
}
else if (WritableCompatUtil.isShortWritable(writable)) {
generator.writeNumber(WritableCompatUtil.unwrap(writable));
}
else if (writable instanceof IntWritable) {
generator.writeNumber(((IntWritable) writable).get());
}
else if (writable instanceof LongWritable) {
generator.writeNumber(((LongWritable) writable).get());
}
else if (writable instanceof VLongWritable) {
generator.writeNumber(((VLongWritable) writable).get());
}
else if (writable instanceof VIntWritable) {
generator.writeNumber(((VIntWritable) writable).get());
}
else if (writable instanceof ByteWritable) {
generator.writeNumber(((ByteWritable) writable).get());
}
else if (writable instanceof DoubleWritable) {
generator.writeNumber(((DoubleWritable) writable).get());
}
else if (writable instanceof FloatWritable) {
generator.writeNumber(((FloatWritable) writable).get());
}
else if (writable instanceof BooleanWritable) {
generator.writeBoolean(((BooleanWritable) writable).get());
}
else if (writable instanceof BytesWritable) {
BytesWritable bw = (BytesWritable) writable;
generator.writeBinary(bw.getBytes(), 0, bw.getLength());
}
else if (writable instanceof MD5Hash) {
generator.writeString(writable.toString());
}
else if (writable instanceof ArrayWritable) {
generator.writeBeginArray();
for (Writable wrt : ((ArrayWritable) writable).get()) {
Result result = write(wrt, generator);
if (!result.isSuccesful()) {
return result;
}
}
generator.writeEndArray();
}
else if (writable instanceof AbstractMapWritable) {
Map map = (Map) writable;
generator.writeBeginObject();
// ignore handling sets (which are just maps with null values)
for (Entry entry : map.entrySet()) {
String fieldName = entry.getKey().toString();
if (shouldKeep(generator.getParentPath(), fieldName)) {
generator.writeFieldName(fieldName);
Result result = write(entry.getValue(), generator);
if (!result.isSuccesful()) {
return result;
}
}
}
generator.writeEndObject();
}
else {
if (writeUnknownTypes) {
return handleUnknown(writable, generator);
}
return Result.FAILED(writable);
}
return Result.SUCCESFUL();
}
protected Result handleUnknown(Writable value, Generator generator) {
generator.writeBinary(WritableUtils.toByteArray(value));
return Result.SUCCESFUL();
}
}