io.github.maxymania.powercache.hash.Util.java Source code

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Here is the source code for io.github.maxymania.powercache.hash.Util.java

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/*
 * Copyright 2015 Simon Schmidt.
 *
 * 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 io.github.maxymania.powercache.hash;

import com.google.common.hash.HashFunction;
import com.google.common.hash.Hasher;
import java.nio.charset.Charset;

/**
 *
 * @author simon
 */
public class Util {

    private static final String HEX = "0123456789abcdef";
    public static final Charset UTF = Charset.forName("utf8");
    public static final AnyFunnel funnel = new AnyFunnel();

    public static byte[] hash(HashFunction hf, String catname, Object[] obj) {
        Hasher digest = hf.newHasher();
        digest.putString(catname, UTF);
        digest.putObject(obj, funnel);
        return digest.hash().asBytes();
    }

    public static byte[] hash(HashFunction hf, Object obj) {
        Hasher digest = hf.newHasher();
        digest.putObject(obj, funnel);
        return digest.hash().asBytes();
    }

    public static String hex(byte[] data) {
        char[] out = new char[data.length * 2];
        for (int i = 0, n = data.length; i < n; ++i) {
            out[i * 2] = HEX.charAt(data[i] & 0xf);
            out[(i * 2) + 1] = HEX.charAt((data[i] >> 4) & 0xf);
        }
        return new String(out);
    }
}