    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    package org.apache.commons.io.output;
    018
    019    import java.io.OutputStream;
    020
    021    /**
    022     * Proxy stream that prevents the underlying output stream from being closed.
    023     * <p>
    024     * This class is typically used in cases where an output stream needs to be
    025     * passed to a component that wants to explicitly close the stream even if
    026     * other components would still use the stream for output.
    027     *
    028     * @version $Id: CloseShieldOutputStream.java 659817 2008-05-24 13:23:10Z niallp $
    029     * @since Commons IO 1.4
    030     */
    031    public class CloseShieldOutputStream extends ProxyOutputStream {
    032
    033        /**
    034         * Creates a proxy that shields the given output stream from being
    035         * closed.
    036         *
    037         * @param out underlying output stream
    038         */
    039        public CloseShieldOutputStream(OutputStream out) {
    040            super(out);
    041        }
    042
    043        /**
    044         * Replaces the underlying output stream with a {@link ClosedOutputStream}
    045         * sentinel. The original output stream will remain open, but this proxy
    046         * will appear closed.
    047         */
    048        @Override
    049        public void close() {
    050            out = new ClosedOutputStream();
    051        }
    052
    053    }