com.github.shyiko.hmp.ExecutionStreamHandler.java Source code

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Here is the source code for com.github.shyiko.hmp.ExecutionStreamHandler.java

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/*
 * Copyright 2012 Stanley Shyiko
 *
 * 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 com.github.shyiko.hmp;

import org.apache.commons.exec.PumpStreamHandler;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.OutputStream;

/**
 * @author <a href="mailto:stanley.shyiko@gmail.com">Stanley Shyiko</a>
 */
class ExecutionStreamHandler extends PumpStreamHandler {

    /**
     * Used instead of null as a workaround to NameNode/DataNode freezes on Mac OS X.
     */
    private static final NullOutputStream NULL_OUTPUT_STREAM = new NullOutputStream();

    public ExecutionStreamHandler(boolean suppressOutput) {
        this(suppressOutput, null);
    }

    public ExecutionStreamHandler(boolean suppressOutput, String input) {
        super(suppressOutput ? NULL_OUTPUT_STREAM : System.out, suppressOutput ? NULL_OUTPUT_STREAM : System.err,
                input == null ? null : new ByteArrayInputStream(input.getBytes()));
    }

    private static class NullOutputStream extends OutputStream {

        public void write(byte[] b, int off, int len) throws IOException {
        }

        public void write(int b) throws IOException {
        }
    }
}