com.emc.codec.compression.CompressionUtil Maven / Gradle / Ivy

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/*
 * Copyright (c) 2015, 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.codec.compression;

import com.emc.codec.util.CodecUtil;

public class CompressionUtil {
    public static int getCompressionLevel(String encodeSpec, int defaultLevel) {
        int level = defaultLevel;
        String algorithm = CodecUtil.getEncodeAlgorithm(encodeSpec);

        if (algorithm != null && algorithm.contains("/"))
            level = Integer.parseInt(algorithm.substring(algorithm.indexOf("/") + 1));

        validateCompressionLevel(level);
        return level;
    }

    public static String getEncodeSpec(String algorithm, int compressionLevel) {
        validateCompressionLevel(compressionLevel);
        return CodecUtil.getEncodeSpec(CompressionConstants.COMPRESSION_TYPE, algorithm + "/" + compressionLevel);
    }

    public static void validateCompressionLevel(int compressionLevel) {
        if (compressionLevel > 9 || compressionLevel < 0)
            throw new IllegalArgumentException("Invalid compression level: " + compressionLevel);
    }
}