fm.last.moji.impl.FileDownloadInputStream.java Source code

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Here is the source code for fm.last.moji.impl.FileDownloadInputStream.java

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/*
 * Copyright 2012 Last.fm
 *
 *  Licensed 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 fm.last.moji.impl;

import java.io.IOException;
import java.io.InputStream;
import java.util.concurrent.locks.Lock;

import org.apache.commons.io.input.CountingInputStream;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

class FileDownloadInputStream extends InputStream {

    private static final Logger log = LoggerFactory.getLogger(FileDownloadInputStream.class);

    private final CountingInputStream delegate;
    private final Lock readLock;

    FileDownloadInputStream(InputStream delegate, Lock readLock) {
        this.readLock = readLock;
        this.delegate = new CountingInputStream(delegate);
    }

    @Override
    public int read() throws IOException {
        return delegate.read();
    }

    @Override
    public int read(byte[] b) throws IOException {
        return delegate.read(b);
    }

    @Override
    public int read(byte[] b, int off, int len) throws IOException {
        return delegate.read(b, off, len);
    }

    @Override
    public long skip(long n) throws IOException {
        return delegate.skip(n);
    }

    @Override
    public int available() throws IOException {
        return delegate.available();
    }

    @Override
    public void close() throws IOException {
        log.debug("Read {} bytes", delegate.getByteCount());
        try {
            delegate.close();
        } finally {
            unlockQuietly(readLock);
        }
    }

    @Override
    public void mark(int readlimit) {
        delegate.mark(readlimit);
    }

    @Override
    public void reset() throws IOException {
        delegate.reset();
    }

    @Override
    public boolean markSupported() {
        return delegate.markSupported();
    }

    private void unlockQuietly(Lock lock) {
        try {
            lock.unlock();
        } catch (IllegalMonitorStateException e) {
        }
    }

}