com.cloudera.ByteBufferWritable.java Source code

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Here is the source code for com.cloudera.ByteBufferWritable.java

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/**
 * 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 com.cloudera;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.nio.ByteBuffer;

import org.apache.hadoop.io.BinaryComparable;
import org.apache.hadoop.io.WritableComparable;

public class ByteBufferWritable extends BinaryComparable implements WritableComparable<BinaryComparable> {

    private ByteBuffer buffer;

    /**
     * Creates a new, 0-length ByteBufferWritable
     */
    public ByteBufferWritable() {
        this.buffer = null;
    }

    /**
     * This returns the underlying ByteBuffer.
     * <p>
     * This is a reference, not a deep copy, so be careful!
     */
    public ByteBuffer getBuffer() {
        return buffer;
    }

    public void setByteBuffer(ByteBuffer buffer) {
        this.buffer = buffer;
    }

    @Override
    public void write(DataOutput out) throws IOException {
        int oldPos = buffer.position();
        byte[] b = new byte[buffer.limit()];
        buffer.rewind();
        buffer.get(b);
        buffer.position(oldPos);
        out.writeInt(b.length);
        out.write(b);
    }

    @Override
    public void readFields(DataInput in) throws IOException {
        buffer.clear();
        int size = in.readInt();
        byte[] b = new byte[size];
        in.readFully(b);
        buffer.put(b);
        buffer.rewind();
    }

    @Override
    public int getLength() {
        return buffer.limit();
    }

    @Override
    public byte[] getBytes() {
        int oldPos = buffer.position();
        buffer.rewind();
        byte[] b = new byte[buffer.limit()];
        buffer.get(b);
        buffer.position(oldPos);
        return b;
    }

}