    001    /*
    002     * Licensed to the Apache Software Foundation (ASF) under one or more
    003     *  contributor license agreements.  See the NOTICE file distributed with
    004     *  this work for additional information regarding copyright ownership.
    005     *  The ASF licenses this file to You under the Apache License, Version 2.0
    006     *  (the "License"); you may not use this file except in compliance with
    007     *  the License.  You may obtain a copy of the License at
    008     *
    009     *      http://www.apache.org/licenses/LICENSE-2.0
    010     *
    011     *  Unless required by applicable law or agreed to in writing, software
    012     *  distributed under the License is distributed on an "AS IS" BASIS,
    013     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014     *  See the License for the specific language governing permissions and
    015     *  limitations under the License.
    016     *
    017     */
    018
    019    package org.apache.commons.exec;
    020
    021    import java.io.IOException;
    022    import java.io.InputStream;
    023    import java.io.OutputStream;
    024
    025    /**
    026     * Used by <code>Execute</code> to handle input and output stream of
    027     * subprocesses.
    028     */
    029    public interface ExecuteStreamHandler {
    030
    031        /**
    032         * Install a handler for the input stream of the subprocess.
    033         *
    034         * @param os
    035         *            output stream to write to the standard input stream of the
    036         *            subprocess
    037         */
    038        void setProcessInputStream(OutputStream os) throws IOException;
    039
    040        /**
    041         * Install a handler for the error stream of the subprocess.
    042         *
    043         * @param is
    044         *            input stream to read from the error stream from the subprocess
    045         */
    046        void setProcessErrorStream(InputStream is) throws IOException;
    047
    048        /**
    049         * Install a handler for the output stream of the subprocess.
    050         *
    051         * @param is
    052         *            input stream to read from the error stream from the subprocess
    053         */
    054        void setProcessOutputStream(InputStream is) throws IOException;
    055
    056        /**
    057         * Start handling of the streams.
    058         */
    059        void start() throws IOException;
    060
    061        /**
    062         * Stop handling of the streams - will not be restarted.
    063         */
    064        void stop();
    065    }