org.hdiv.idGenerator.RandomUidGenerator.java Source code

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Here is the source code for org.hdiv.idGenerator.RandomUidGenerator.java

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/**
 * Copyright 2005-2011 hdiv.org
 *
 * 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 org.hdiv.idGenerator;

import java.io.Serializable;
import java.util.Random;

import javax.servlet.ServletContext;

import org.springframework.web.context.ServletContextAware;

/**
 * Unique id generator based on the java.util.Random class.
 * 
 */
public class RandomUidGenerator implements UidGenerator, ServletContextAware {

    /**
      * Used to generate unique server state IDs.
      */
    protected Random random;

    /**
     * ServletContext of the application
     */
    private ServletContext servletContext;

    /**
     * Initializaiton method
     */
    public void init() {
        this.random = new Random(System.currentTimeMillis() + this.servletContext.hashCode());
    }

    /*
     * (non-Javadoc)
     * @see org.hdiv.util.UidGenerator#generateUid()
     */
    public Serializable generateUid() {

        long uid = this.random.nextLong();
        if (uid < 0) {
            uid = uid * -1;//Hacerlo positivo
        }
        return new Long(uid).toString();
    }

    /*
     * (non-Javadoc)
     * @see org.hdiv.util.UidGenerator#parseUid(java.lang.String)
     */
    public Serializable parseUid(String encodedUid) {

        return encodedUid;
    }

    /*
     * (non-Javadoc)
     * @see org.springframework.web.context.ServletContextAware#setServletContext(javax.servlet.ServletContext)
     */
    public void setServletContext(ServletContext servletContext) {

        this.servletContext = servletContext;
    }

}