com.google.nigori.common.Revision.java Source code

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Here is the source code for com.google.nigori.common.Revision.java

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/*
 * Copyright (C) 2012 Daniel Thomas (drt24)
 * 
 * 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 com.google.nigori.common;

import static com.google.nigori.common.MessageLibrary.bytesToString;

import java.io.UnsupportedEncodingException;
import java.util.Arrays;

import org.apache.commons.codec.binary.Base64;

/**
 * @author drt24
 * 
 */
public class Revision {

    public static final Revision EMPTY = new Revision(new byte[] {});
    private final byte[] revision;

    public byte[] getBytes() {
        return revision;
    }

    public Revision(byte[] revision) {
        if (revision == null) {
            throw new NullPointerException("Null revisons not allowed");
        }
        this.revision = revision;
    }

    /**
     * This methods exists as a convenience for when writing tests, use is not encouraged in general.
     * @param revision
     * @throws UnsupportedEncodingException
     */
    public Revision(String revision) throws UnsupportedEncodingException {
        if (revision == null) {
            throw new NullPointerException("Null revisons not allowed");
        }
        this.revision = MessageLibrary.toBytes(revision);
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + Arrays.hashCode(revision);
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        Revision other = (Revision) obj;
        if (!Arrays.equals(revision, other.revision))
            return false;
        return true;
    }

    @Override
    public String toString() {
        return bytesToString(Base64.encodeBase64(revision));
    }
}