/*
* 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.nifi.processors.hadoop.util;
import org.apache.hadoop.io.Writable;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.io.InputStream;
/**
* Simple implementation of {@link Writable} that writes data from an InputStream. This class will throw an
* <tt>UnsupportedOperationException</tt> if {@link #readFields(DataInput)} is called.
*/
public class InputStreamWritable implements Writable {
private final InputStream inStream;
private final int size;
public InputStreamWritable(final InputStream inStream, final int size) {
this.inStream = inStream;
this.size = size;
}
@Override
public void write(DataOutput output) throws IOException {
int numRead, totalRead = 0;
final byte[] buffer = new byte[8192];
output.writeInt(size);
int tempSize = size == -1 ? Integer.MAX_VALUE : size;
int toRead = Math.min(tempSize, 8192);
while (totalRead < tempSize && (numRead = inStream.read(buffer, 0, toRead)) != -1) {
output.write(buffer, 0, numRead);
totalRead += numRead;
toRead = Math.min(8192, tempSize - totalRead);
}
}
@Override
public void readFields(DataInput di) throws IOException {
throw new UnsupportedOperationException("InputStreamWritable does not implement #readFields");
}
}