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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.tomitribe.util;

import java.io.InputStream;
import java.io.OutputStream;
import java.util.concurrent.Future;
import java.util.concurrent.FutureTask;

public final class Pipe implements Runnable {

    private final InputStream in;
    private final OutputStream out;

    public Pipe(final InputStream in, final OutputStream out) {
        this.in = in;
        this.out = out;
    }

    public static void pipe(final Process process) {
        pipe(process.getInputStream(), System.out);
        pipe(process.getErrorStream(), System.err);
        //        pipe(System.in, process.getOutputStream());
    }

    public static Future pipe(final InputStream in, final OutputStream out) {
        final Pipe target = new Pipe(in, out);

        final FutureTask task = new FutureTask(target, target);
        final Thread thread = new Thread(task);
        thread.setDaemon(true);
        thread.start();

        return task;
    }

    public void run() {
        try {
            int i = -1;

            final byte[] buf = new byte[1024];

            while ((i = in.read(buf)) != -1) {
                out.write(buf, 0, i);
            }
        } catch (final Exception e) {
            e.printStackTrace();
        }
    }
}