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Apache Commons Compress defines an API for working with compression and archive formats. These include bzip2, gzip, pack200, LZMA, XZ, Snappy, traditional Unix Compress, DEFLATE, DEFLATE64, LZ4, Brotli, Zstandard and ar, cpio, jar, tar, zip, dump, 7z, arj.

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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.apache.commons.compress.parallel;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UncheckedIOException;
import java.nio.file.Files;
import java.nio.file.Path;

/**
 * ScatterGatherBackingStore that is backed by a path.
 *
 * @since 1.10
 */
public class FileBasedScatterGatherBackingStore implements ScatterGatherBackingStore {
    private final Path target;
    private final OutputStream outputStream;
    private boolean closed;

    public FileBasedScatterGatherBackingStore(final File target) throws FileNotFoundException {
        this(target.toPath());
    }

    /**
     * Constructs a new instance for the given path.
     *
     * @param target The path to offload compressed data into.
     * @throws FileNotFoundException if the file doesn't exist
     * @since 1.22
     */
    public FileBasedScatterGatherBackingStore(final Path target) throws FileNotFoundException {
        this.target = target;
        try {
            outputStream = Files.newOutputStream(target);
        } catch (final FileNotFoundException ex) {
            throw ex;
        } catch (final IOException ex) {
            // must convert exception to stay backwards compatible with Compress 1.10 to 1.13
            throw new UncheckedIOException(ex); // NOSONAR
        }
    }

    @Override
    public void close() throws IOException {
        try {
            closeForWriting();
        } finally {
            Files.deleteIfExists(target);
        }
    }

    @Override
    public void closeForWriting() throws IOException {
        if (!closed) {
            outputStream.close();
            closed = true;
        }
    }

    @Override
    public InputStream getInputStream() throws IOException {
        return Files.newInputStream(target);
    }

    @Override
    public void writeOut(final byte[] data, final int offset, final int length) throws IOException {
        outputStream.write(data, offset, length);
    }
}