guidgenerator.java

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/*
 * @author                        : Neelesh
 * @Version                       : 1.0
 *
 * Development Environment        : Oracle9i JDeveloper
 * Name of the Application        : GUIDGenerator.java
 * Creation/Modification History  :
 *
 * Neelesh    23-Feb-2003      Created
 *
 */
package oracle.otnsamples.util;


// Import to generate random number
import java.security.SecureRandom;


/**
 * This class uses a combination of current time in milliseconds and a random
 * number to generate a unique key.
 *
 * @author Neelesh
 * @version 1.0
 */
public class GUIDGenerator implements KeyGenerator {

  // Instance of secure random to generate random numbers
  private SecureRandom random;

  /**
   * Constructor. An instance of SecureRandom is initialized here.
   */
  public GUIDGenerator() {
    random = new SecureRandom();
    System.out.println(random.getProvider().getInfo());
  }

  /**
   * This method returns a key that is unique to a millisecond. The uniqueness
   * is increased by appending a random number to the key.
   *
   * @return <b>String</b> The unique key
   */
  public String getKey() {

    // Append current time in millis to a hexadecimal representation
    // of a random number.
    String key =
      "" + System.currentTimeMillis() + Long.toHexString(random.nextInt());

    return key;
  }
}