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/**
 * Copyright (c) 2012, University of Konstanz, Distributed Systems Group All rights reserved.
 * 
 * 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. * Neither the name of the University of Konstanz nor the names of its contributors may 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  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 org.jscsi.parser.digest;

/**
 * DigestFactory
 * 
 * A factory to create instances of the supported digest algorithms.
 * 
 * @author Volker Wildi
 */
public final class DigestFactory {

    // --------------------------------------------------------------------------
    // --------------------------------------------------------------------------

    /**
     * Constructor to create new, empty DigestFactory instance.
     */
    public DigestFactory () {

    }

    // --------------------------------------------------------------------------
    // --------------------------------------------------------------------------

    /**
     * This method creates an IDigest instance of the given type.
     * 
     * @param digestName The name of the digest type.
     * @return The IDigest instance of the given type.
     */
    public final IDigest create (final String digestName) {

        IDigest digest;
        if (digestName.compareTo("None") == 0) {
            digest = new NullDigest();
        } else if (digestName.compareTo("CRC32C") == 0) {
            digest = new CRC32CDigest();
        } else {
            throw new IllegalArgumentException("Digest Type (" + digestName + ") is unknown.");
        }

        return digest;
    }

    // --------------------------------------------------------------------------
    // --------------------------------------------------------------------------
    // --------------------------------------------------------------------------
    // --------------------------------------------------------------------------

}