edu.indiana.lib.osid.component.id.Id.java Source code

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Here is the source code for edu.indiana.lib.osid.component.id.Id.java

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/**********************************************************************************
 * $URL$
 * $Id$
 ***********************************************************************************
 *
 * Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008 The Sakai Foundation
 *
 * Licensed under the Educational Community 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.opensource.org/licenses/ECL-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 edu.indiana.lib.osid.component.id;

import java.util.Random;

/**
 * @inheritDoc
 */
public class Id implements org.osid.shared.Id {
    private static org.apache.commons.logging.Log _log = edu.indiana.lib.twinpeaks.util.LogUtils.getLog(Id.class);

    private static long idBase = System.currentTimeMillis();
    private String idString = null;

    private synchronized long getIdBase() {
        return idBase++;
    }

    private void log(String entry) throws org.osid.shared.SharedException {
        _log.debug("Id: " + entry);
    }

    protected Id() throws org.osid.shared.SharedException {
        long base;
        Random random;

        base = getIdBase();
        random = new Random(base);

        idString = String.valueOf(base) + "-" + String.valueOf(random.nextLong());
        random = null;
    }

    protected Id(String idString) throws org.osid.shared.SharedException {
        if (idString == null) {
            throw new org.osid.shared.SharedException(org.osid.id.IdException.NULL_ARGUMENT);
        }
        this.idString = idString;
    }

    public String getIdString() throws org.osid.shared.SharedException {
        return this.idString;
    }

    public boolean isEqual(org.osid.shared.Id id) throws org.osid.shared.SharedException {
        return id.getIdString().equals(this.idString);
    }
}