org.apache.hadoop.io.DataOutputOutputStream.java Source code

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Here is the source code for org.apache.hadoop.io.DataOutputOutputStream.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 org.apache.hadoop.io;

import java.io.DataOutput;
import java.io.IOException;
import java.io.OutputStream;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;

/**
 * OutputStream implementation that wraps a DataOutput.
 */
@InterfaceAudience.Public
@InterfaceStability.Unstable
public class DataOutputOutputStream extends OutputStream {

    private final DataOutput out;

    /**
     * Construct an OutputStream from the given DataOutput. If 'out'
     * is already an OutputStream, simply returns it. Otherwise, wraps
     * it in an OutputStream.
     * @param out the DataOutput to wrap
     * @return an OutputStream instance that outputs to 'out'
     */
    public static OutputStream constructOutputStream(DataOutput out) {
        if (out instanceof OutputStream) {
            return (OutputStream) out;
        } else {
            return new DataOutputOutputStream(out);
        }
    }

    private DataOutputOutputStream(DataOutput out) {
        this.out = out;
    }

    @Override
    public void write(int b) throws IOException {
        out.writeByte(b);
    }

    @Override
    public void write(byte[] b, int off, int len) throws IOException {
        out.write(b, off, len);
    }

    @Override
    public void write(byte[] b) throws IOException {
        out.write(b);
    }

}