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AppsLandia Common - Java Utilities

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// The MIT License (MIT)
// Copyright © 2015 AppsLandia. All rights reserved.

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package com.appslandia.common.base;

import java.util.UUID;

/**
 *
 * @author Loc Ha
 *
 */
public class UUIDGenerator implements TextGenerator {

	@Override
	public String generate() {
		return toString(UUID.randomUUID());
	}

	public static String toString(UUID uuid) {
		// @formatter:off
        return (digits(uuid.getMostSignificantBits() >> 32, 8) +
                digits(uuid.getMostSignificantBits() >> 16, 4) +
                digits(uuid.getMostSignificantBits(), 4) +
                digits(uuid.getLeastSignificantBits() >> 48, 4) +
                digits(uuid.getLeastSignificantBits(), 12));
		// @formatter:on
	}

	private static String digits(long val, int digits) {
		long hi = 1L << (digits * 4);
		return Long.toHexString(hi | (val & (hi - 1))).substring(1);
	}
}