Android Open Source - paperchains Decompressing Entity

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License

The source code is released under:

Apache License

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Java Source Code

/*
 * The MIT License/*  w  w  w  .j  a  va  2  s.com*/
 *
 * Copyright (c) 2011, SoundCloud Ltd., Jan Berkel
 * Portions Copyright (c) 2010 Xtreme Labs and Pivotal Labs
 * Portions Copyright (c) 2009 urbanSTEW
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package com.soundcloud.playerapi;

import org.apache.http.HttpEntity;
import org.apache.http.entity.HttpEntityWrapper;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

abstract class DecompressingEntity extends HttpEntityWrapper {
    /**
     * Default buffer size.
     */
    private static final int BUFFER_SIZE = 1024 * 2;

    /**
     * {@link #getContent()} method must return the same {@link InputStream}
     * instance when DecompressingEntity is wrapping a streaming entity.
     */
    private InputStream content;

    /**
     * Creates a new {@link DecompressingEntity}.
     *
     * @param wrapped the non-null {@link HttpEntity} to be wrapped
     */
    public DecompressingEntity(final HttpEntity wrapped) {
        super(wrapped);
    }

    abstract InputStream decorate(final InputStream wrapped) throws IOException;

    private InputStream getDecompressingStream() throws IOException {
        final InputStream in = wrappedEntity.getContent();
        try {
            return decorate(in);
        } catch (final IOException ex) {
            in.close();
            throw ex;
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public InputStream getContent() throws IOException {
        if (wrappedEntity.isStreaming()) {
            if (content == null) {
                content = getDecompressingStream();
            }
            return content;
        } else {
            return getDecompressingStream();
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void writeTo(final OutputStream outstream) throws IOException {
        final InputStream instream = getContent();
        try {
            final byte[] buffer = new byte[BUFFER_SIZE];
            int l;
            while ((l = instream.read(buffer)) != -1) {
                outstream.write(buffer, 0, l);
            }
        } finally {
            instream.close();
        }
    }
}

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