com.qwazr.utils.HashUtils.java Source code

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Here is the source code for com.qwazr.utils.HashUtils.java

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/**
 * Copyright 2015-2016 Emmanuel Keller / QWAZR
 * <p/>
 * 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
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * 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 com.qwazr.utils;

import com.google.common.hash.HashFunction;
import com.google.common.hash.Hashing;
import org.apache.commons.codec.digest.DigestUtils;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.nio.charset.Charset;

public class HashUtils {

    public static final int getMurmur3Mod(final String hashString, Charset charset, final int mod) {
        HashFunction m3 = Hashing.murmur3_128();
        if (charset == null)
            charset = Charset.defaultCharset();
        return (Math.abs(m3.hashString(hashString, charset).asInt()) % mod);
    }

    public static String md5Hex(File file) throws IOException {
        FileInputStream fis = new FileInputStream(file);
        try {
            BufferedInputStream bis = new BufferedInputStream(fis);
            try {
                return DigestUtils.md5Hex(bis);
            } finally {
                IOUtils.closeQuietly(bis);
            }
        } finally {
            IOUtils.closeQuietly(fis);
        }
    }

    public static String md5Hex(String text) {
        return DigestUtils.md5Hex(text);
    }
}