edu.stolaf.cs.wmrserver.testjob.CappedInputStream.java Source code

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Here is the source code for edu.stolaf.cs.wmrserver.testjob.CappedInputStream.java

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/*
 * Copyright 2010 WebMapReduce Developers
 * Licensed 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 edu.stolaf.cs.wmrserver.testjob;

import java.io.InputStream;
import java.io.IOException;
import org.apache.commons.io.input.CountingInputStream;

public class CappedInputStream extends CountingInputStream {
    private long _maximumCount;

    public CappedInputStream(InputStream input, long maximumCount) {
        super(input);
        _maximumCount = maximumCount;
    }

    public int read() throws IOException {
        long count = getByteCount();
        if (count < _maximumCount)
            return super.read();
        return 0;
    }

    public int read(byte[] buffer) throws IOException {
        long count = getByteCount();
        if (count >= _maximumCount)
            return 0;
        else if ((count + buffer.length) <= _maximumCount)
            return super.read(buffer);
        return super.read(buffer, 0, (int) (_maximumCount - count));
    }

    public int read(byte[] buffer, int offset, int length) throws IOException {
        long count = getByteCount();
        if (count >= _maximumCount)
            return 0;
        else if ((count + length) <= _maximumCount)
            return super.read(buffer, offset, length);
        return super.read(buffer, offset, (int) (_maximumCount - count));
    }
}