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 */
018package org.apache.commons.compress.parallel;
019
020import java.io.File;
021import java.io.FileNotFoundException;
022import java.io.FileInputStream;
023import java.io.FileOutputStream;
024import java.io.IOException;
025import java.io.InputStream;
026
027/**
028 * ScatterGatherBackingStore that is backed by a file.
029 *
030 * @since 1.10
031 */
032public class FileBasedScatterGatherBackingStore implements ScatterGatherBackingStore {
033    private final File target;
034    private final FileOutputStream os;
035    private boolean closed;
036
037    public FileBasedScatterGatherBackingStore(final File target) throws FileNotFoundException {
038        this.target = target;
039        os = new FileOutputStream(target);
040    }
041
042    @Override
043    public InputStream getInputStream() throws IOException {
044        return new FileInputStream(target);
045    }
046
047    @Override
048    @SuppressWarnings("ResultOfMethodCallIgnored")
049    public void closeForWriting() throws IOException {
050        if (!closed) {
051            os.close();
052            closed = true;
053        }
054    }
055
056    @Override
057    public void writeOut(final byte[] data, final int offset, final int length) throws IOException {
058        os.write(data, offset, length);
059    }
060
061    @Override
062    public void close() throws IOException {
063        closeForWriting();
064        target.delete();
065    }
066}