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Elasticsearch Hadoop Map/Reduce
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.hadoop.serialization.json;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.util.Deque;
import java.util.LinkedList;
import org.apache.commons.logging.LogFactory;
import org.elasticsearch.hadoop.serialization.EsHadoopSerializationException;
import org.elasticsearch.hadoop.serialization.Generator;
import org.elasticsearch.hadoop.thirdparty.codehaus.jackson.JsonEncoding;
import org.elasticsearch.hadoop.thirdparty.codehaus.jackson.JsonFactory;
import org.elasticsearch.hadoop.thirdparty.codehaus.jackson.JsonGenerator;
import org.elasticsearch.hadoop.util.StringUtils;
public class JacksonJsonGenerator implements Generator {
private static final boolean HAS_UTF_8;
private static final JsonFactory JSON_FACTORY;
private final JsonGenerator generator;
private final OutputStream out;
private Deque currentPath = new LinkedList();
private String currentPathCached;
private String currentName;
static {
boolean hasMethod = false;
try {
Method m = JsonGenerator.class.getMethod("writeUTF8String", byte[].class, int.class, int.class);
hasMethod = true;
} catch (NoSuchMethodException ex) {
}
HAS_UTF_8 = hasMethod;
if (!HAS_UTF_8) {
LogFactory.getLog(JacksonJsonGenerator.class).warn(
"Old Jackson version (pre-1.7) detected; consider upgrading to improve performance");
}
JSON_FACTORY = new JsonFactory();
JSON_FACTORY.configure(JsonGenerator.Feature.QUOTE_FIELD_NAMES, true);
}
public JacksonJsonGenerator(OutputStream out) {
try {
this.out = out;
// use dedicated method to lower Jackson requirement
this.generator = JSON_FACTORY.createJsonGenerator(out, JsonEncoding.UTF8);
} catch (IOException ex) {
throw new EsHadoopSerializationException(ex);
}
}
public void usePrettyPrint() {
generator.useDefaultPrettyPrinter();
}
@Override
public Generator writeBeginArray() {
try {
generator.writeStartArray();
return this;
} catch (IOException ex) {
throw new EsHadoopSerializationException(ex);
}
}
@Override
public Generator writeEndArray() {
try {
generator.writeEndArray();
return this;
} catch (IOException ex) {
throw new EsHadoopSerializationException(ex);
}
}
@Override
public Generator writeBeginObject() {
try {
generator.writeStartObject();
if (currentName != null) {
currentPath.addLast(currentName);
currentName = null;
currentPathCached = null;
}
return this;
} catch (IOException ex) {
throw new EsHadoopSerializationException(ex);
}
}
@Override
public Generator writeEndObject() {
try {
generator.writeEndObject();
currentName = currentPath.pollLast();
currentPathCached = null;
return this;
} catch (IOException ex) {
throw new EsHadoopSerializationException(ex);
}
}
@Override
public Generator writeFieldName(String name) {
try {
generator.writeFieldName(name);
currentName = name;
return this;
} catch (IOException ex) {
throw new EsHadoopSerializationException(ex);
}
}
@Override
public Generator writeString(String text) {
try {
generator.writeString(text);
return this;
} catch (IOException ex) {
throw new EsHadoopSerializationException(ex);
}
}
@Override
public Generator writeUTF8String(byte[] text, int offset, int len) {
try {
if (HAS_UTF_8) {
generator.writeUTF8String(text, offset, len);
}
else {
generator.writeString(new String(text, offset, len, StringUtils.UTF_8));
}
return this;
} catch (IOException ex) {
throw new EsHadoopSerializationException(ex);
}
}
@Override
public Generator writeUTF8String(byte[] text) {
return writeUTF8String(text, 0, text.length);
}
@Override
public Generator writeBinary(byte[] data, int offset, int len) {
try {
generator.writeBinary(data, offset, len);
return this;
} catch (IOException ex) {
throw new EsHadoopSerializationException(ex);
}
}
@Override
public Generator writeBinary(byte[] data) {
return writeBinary(data, 0, data.length);
}
@Override
public Generator writeNumber(short s) {
return writeNumber((int) s);
}
@Override
public Generator writeNumber(byte b) {
return writeNumber((int) b);
}
@Override
public Generator writeNumber(int i) {
try {
generator.writeNumber(i);
return this;
} catch (IOException ex) {
throw new EsHadoopSerializationException(ex);
}
}
@Override
public Generator writeNumber(long l) {
try {
generator.writeNumber(l);
return this;
} catch (IOException ex) {
throw new EsHadoopSerializationException(ex);
}
}
@Override
public Generator writeNumber(double d) {
try {
generator.writeNumber(d);
return this;
} catch (IOException ex) {
throw new EsHadoopSerializationException(ex);
}
}
@Override
public Generator writeNumber(float f) {
try {
generator.writeNumber(f);
return this;
} catch (IOException ex) {
throw new EsHadoopSerializationException(ex);
}
}
@Override
public Generator writeBoolean(boolean b) {
try {
generator.writeBoolean(b);
return this;
} catch (IOException ex) {
throw new EsHadoopSerializationException(ex);
}
}
@Override
public Generator writeNull() {
try {
generator.writeNull();
return this;
} catch (IOException ex) {
throw new EsHadoopSerializationException(ex);
}
}
@Override
public Generator writeRaw(String value) {
try {
generator.writeRaw(value);
return this;
} catch (IOException ex) {
throw new EsHadoopSerializationException(ex);
}
}
@Override
public void flush() {
try {
generator.flush();
} catch (IOException ex) {
throw new EsHadoopSerializationException(ex);
}
}
@Override
public void close() {
try {
generator.close();
} catch (IOException ex) {
throw new EsHadoopSerializationException(ex);
}
}
@Override
public Object getOutputTarget() {
//return generator.getOutputTarget();
return out;
}
@Override
public String getParentPath() {
if (currentPathCached == null) {
if (currentPath.isEmpty()) {
currentPathCached = StringUtils.EMPTY;
}
else {
StringBuilder sb = new StringBuilder();
for (String level : currentPath) {
sb.append(level);
sb.append(".");
}
sb.setLength(sb.length() - 1);
currentPathCached = sb.toString();
}
}
return currentPathCached;
}
}