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EMC Atmos Client for Java - provides REST access to object data on EMC platforms using the Atmos API.
There is a newer version: 3.2.1
/*
 * Copyright (c) 2013-2016, EMC Corporation.
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * + Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * + Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * + The name of EMC Corporation may not be used to endorse or promote
 *   products derived from this software without specific prior written
 *   permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package com.emc.atmos.api.jersey;

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

/**
 * A simple delegating class to attach a size to an input stream.  This class does not perform any calculation and
 * merely stores/returns the size specified in the constructor.
 */
public class MeasuredInputStream extends InputStream {
    private InputStream source;
    private long size;
    private long read = 0;

    public MeasuredInputStream( InputStream source, long size ) {
        this.source = source;
        this.size = size;
    }

    public long getSize() {
        return size;
    }

    public long getRead() {
        return read;
    }

    @Override
    public int read() throws IOException {
        int value = source.read();
        if ( value != -1 ) read++;
        return value;
    }

    @Override
    public int read( byte[] bytes ) throws IOException {
        int count = source.read( bytes );
        if ( count != -1 ) read += count;
        return count;
    }

    @Override
    public int read( byte[] bytes, int i, int i1 ) throws IOException {
        int count = source.read( bytes, i, i1 );
        if ( count != -1 ) read += count;
        return count;
    }

    @Override
    public long skip( long l ) throws IOException {
        long count = source.skip( l );
        if ( count != -1 ) read += count;
        return count;
    }

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

    @Override
    public void close() throws IOException {
        source.close();
    }

    @Override
    public void mark( int i ) {
        source.mark( i );
    }

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

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