SizedInputStream.java

/**
 * Copyright French Prime minister Office/SGMAP/DINSIC/Vitam Program (2015-2019)
 *
 * contact.vitam@culture.gouv.fr
 *
 * This software is a computer program whose purpose is to implement a digital archiving back-office system managing
 * high volumetry securely and efficiently.
 *
 * This software is governed by the CeCILL 2.1 license under French law and abiding by the rules of distribution of free
 * software. You can use, modify and/ or redistribute the software under the terms of the CeCILL 2.1 license as
 * circulated by CEA, CNRS and INRIA at the following URL "http://www.cecill.info".
 *
 * As a counterpart to the access to the source code and rights to copy, modify and redistribute granted by the license,
 * users are provided only with a limited warranty and the software's author, the holder of the economic rights, and the
 * successive licensors have only limited liability.
 *
 * In this respect, the user's attention is drawn to the risks associated with loading, using, modifying and/or
 * developing or reproducing the software by the user in light of its specific status of free software, that may mean
 * that it is complicated to manipulate, and that also therefore means that it is reserved for developers and
 * experienced professionals having in-depth computer knowledge. Users are therefore encouraged to load and test the
 * software's suitability as regards their requirements in conditions enabling the security of their systems and/or data
 * to be ensured and, more generally, to use and operate it in the same conditions as regards security.
 *
 * The fact that you are presently reading this means that you have had knowledge of the CeCILL 2.1 license and that you
 * accept its terms.
 **/

package fr.gouv.vitam.common.stream;

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

/**
 * Input stream with read size
 */
public class SizedInputStream extends InputStream {

    private final InputStream is;
    private long size = 0;

    /**
     * Default constructor
     *
     * @param is the InputStream source
     */
    public SizedInputStream(InputStream is) {
        this.is = is;
    }

    @Override
    public int read() throws IOException {
        final int res = is.read();
        if (res != -1) {
            size++;
        }
        return res;
    }

    @Override
    public int read(byte[] b) throws IOException {
        final int res = is.read(b);
        if (res != -1) {
            size += res;
        }
        return res;
    }

    @Override
    public int read(byte[] b, int off, int len) throws IOException {
        final int res = is.read(b, off, len);
        if (res != -1) {
            size += res;
        }
        return res;
    }

    /**
     * Get read size
     *
     * @return the read size
     */
    public long getSize() {
        return size;
    }
}