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Apache Hadoop MapReduce Streaming
/**
* 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.record;
import java.io.DataInput;
import java.io.IOException;
import java.io.DataInputStream;
import java.io.InputStream;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
/**
* @deprecated Replaced by Avro.
*/
@Deprecated
@InterfaceAudience.Public
@InterfaceStability.Stable
public class BinaryRecordInput implements RecordInput {
private DataInput in;
static private class BinaryIndex implements Index {
private int nelems;
private BinaryIndex(int nelems) {
this.nelems = nelems;
}
@Override
public boolean done() {
return (nelems <= 0);
}
@Override
public void incr() {
nelems--;
}
}
private BinaryRecordInput() {}
private void setDataInput(DataInput inp) {
this.in = inp;
}
private static final ThreadLocal B_IN =
new ThreadLocal() {
@Override
protected BinaryRecordInput initialValue() {
return new BinaryRecordInput();
}
};
/**
* Get a thread-local record input for the supplied DataInput.
* @param inp data input stream
* @return binary record input corresponding to the supplied DataInput.
*/
public static BinaryRecordInput get(DataInput inp) {
BinaryRecordInput bin = B_IN.get();
bin.setDataInput(inp);
return bin;
}
/** Creates a new instance of BinaryRecordInput */
public BinaryRecordInput(InputStream strm) {
this.in = new DataInputStream(strm);
}
/** Creates a new instance of BinaryRecordInput */
public BinaryRecordInput(DataInput din) {
this.in = din;
}
@Override
public byte readByte(final String tag) throws IOException {
return in.readByte();
}
@Override
public boolean readBool(final String tag) throws IOException {
return in.readBoolean();
}
@Override
public int readInt(final String tag) throws IOException {
return Utils.readVInt(in);
}
@Override
public long readLong(final String tag) throws IOException {
return Utils.readVLong(in);
}
@Override
public float readFloat(final String tag) throws IOException {
return in.readFloat();
}
@Override
public double readDouble(final String tag) throws IOException {
return in.readDouble();
}
@Override
public String readString(final String tag) throws IOException {
return Utils.fromBinaryString(in);
}
@Override
public Buffer readBuffer(final String tag) throws IOException {
final int len = Utils.readVInt(in);
final byte[] barr = new byte[len];
in.readFully(barr);
return new Buffer(barr);
}
@Override
public void startRecord(final String tag) throws IOException {
// no-op
}
@Override
public void endRecord(final String tag) throws IOException {
// no-op
}
@Override
public Index startVector(final String tag) throws IOException {
return new BinaryIndex(readInt(tag));
}
@Override
public void endVector(final String tag) throws IOException {
// no-op
}
@Override
public Index startMap(final String tag) throws IOException {
return new BinaryIndex(readInt(tag));
}
@Override
public void endMap(final String tag) throws IOException {
// no-op
}
}