hadoop DataOutputOutputStream 源码
haddop DataOutputOutputStream 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/DataOutputOutputStream.java
/**
* 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);
}
}
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