org.i3xx.step.mongo.core.util.IdGen.java Source code

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Here is the source code for org.i3xx.step.mongo.core.util.IdGen.java

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package org.i3xx.step.mongo.core.util;

/*
 * #%L
 * NordApp OfficeBase :: mongo
 * %%
 * Copyright (C) 2014 - 2015 I.D.S. DialogSysteme GmbH
 * %%
 * 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.
 * #L%
 */

import java.math.BigInteger;
import java.nio.ByteBuffer;
import java.util.UUID;

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

public class IdGen {

    /**
     * Gets 128 bit IdRep representation with a generated UUID
     * 
     * @return The IdRep object
     */
    public static final IdRep getUUID() {
        return new JavaIdRep(UUID.randomUUID());
    }

    /**
     * Gets 128 bit IdRep representation from an UUID-String
     * 
     * @param uuid
     * @return The IdRep object
     */
    public static final IdRep fromString(String uuid) {
        return new JavaIdRep(UUID.fromString(uuid));
    }

    /**
     * Gets a 128 bit IdRep in an URL save representation (slow)
     * 
     * @return The IdRep object
     */
    public static final String getURLSafeString(IdRep ui) {
        return Base64.encodeBase64URLSafeString(ui.getBytes());
    }

    /**
     * Gets a 128 bit IdRep from an URL save representation
     * 
     * @param urlSave
     * @return The IdRep object
     */
    public static final IdRep fromURLSaveString(String urlSave) {

        byte[] bytes = Base64.decodeBase64(urlSave);
        ByteBuffer buffer = ByteBuffer.wrap(bytes);
        UUID uuid = new UUID(buffer.getLong(0), buffer.getLong(8));

        return new JavaIdRep(uuid);
    }

    /**
     * Gets a 128 bit IdRep from a BigInteger
     * 
     * @return The IdRep object
     */
    public static final IdRep fromBigInteger(BigInteger ui) {

        UUID uuid = new UUID(ui.shiftRight(64).longValue(), ui.longValue());

        return new JavaIdRep(uuid);
    }
}