asn1boolean.java

来自「CmisJavaApi」· Java 代码 · 共 114 行

/*
 * The contents of this file are subject to the Dyade Public License, 
 * as defined by the file DYADE_PUBLIC_LICENSE.TXT
 *
 * You may not use this file except in compliance with the License. You may
 * obtain a copy of the License on the Dyade web site (www.dyade.fr).
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
 * the specific terms governing rights and limitations under the License.
 *
 * The Original Code is CmisJava API, including the java package 
 * fr.dyade.cmis, released September 5, 2000.
 *
 * The Initial Developer of the Original Code is Dyade. The Original Code and
 * portions created by Dyade are Copyright Bull and Copyright INRIA. 
 * All Rights Reserved.
 */

/*      Copyright 1996-2000 by Institut National de Recherche en Informatique 
 *                             et en Automatique (INRIA)
 *          All rights reserved.  See COPYRIGHT in top-level directory.
 *
 *      Authors: Laurent Andrey, Eric Dillon, Olivier Festor
 */

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//  CVS Info
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//
//  $Id: ASN1Boolean.java,v 1.2 2000/09/05 13:30:23 festor Exp $
//

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//  Todo
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package fr.dyade.cmis.api.types;
import java.io.ObjectStreamException;
/**
  *  Java representation of the ASN.1 Boolean type.
  *  <p>
  *  The implementation is done by encapsulating a simple Java boolean value into this class.
  *
  * @see fr.dyade.cmis.api.types.ASN1Integer
  */
public class ASN1Boolean  extends Value {
      /** Unique ASN1Boolean instance for true.
	* You can use expression such as myASN1BooleanRef == ASN1Boolean.TRUE
	* This is a singleton-like pattern.
	*/
      public static final ASN1Boolean TRUE= new ASN1Boolean(true);
      /** Unique ASN1Boolean instance for false
	* This is a singleton-like pattern.
	*/
      public static final ASN1Boolean FALSE=new ASN1Boolean(false);
      /** Pseudo static constructor to access the singleton.
	* @param pValueBool the java primitive boolean associated the wanted singleton.
	* You write expression like:
	*/
      public static final ASN1Boolean ASN1_BOOLEAN(boolean pValueBool) {
	 return pValueBool?TRUE:FALSE;
      }
      /**
	*  Creates a new instance of ASN1Boolean class.
	*  This is a private constructor as user should access "Singleton TRUE & FALSE"
	*  @param pValue The Java boolean value to set the ASN1Boolean with.
	*/
      private ASN1Boolean(boolean pValue) {
	 super(VALUE_BOOLEAN);
	 fValue = pValue;
      }
      /**
	*  Returns the Java boolean value of this ASN1Boolean object.
	*  @return The boolean value of the ASN1Boolean.
	*/
      public boolean getValue(){
	 return fValue;
      }      
      /**
	*  Returns the Java boolean value of this ASN1Boolean object.
	*  This is an alias for getValue, a-la java.lang naning 
	*  @return The boolean value of the ASN1Boolean.
	*/
      public boolean toBoolean(){
	 return fValue;
      }
      public final ASN1Boolean and( ASN1Boolean b ) {
	 return ASN1_BOOLEAN(fValue && b.fValue);
      }
      public final ASN1Boolean or( ASN1Boolean b ) {
	 return ASN1_BOOLEAN(fValue || b.fValue);
      }
      public final ASN1Boolean not() {
	 return ASN1_BOOLEAN(!fValue);
      }
      public String toString() {
	 return fValue ? "TRUE":"FALSE";
      }
      private boolean fValue;
       /** Filtering instance created after deserialization.
	* <a HREF="http://www.javasoft.com/products/jdk/1.2/docs/guide/serialization/spec/input.doc6.html">
	* Read javasof doc</a> about this method. We are exactly is the example shown here:
	* "The readResolve method would be implemented to determine if that symbol was already defined 
	* and substitute the preexisting equivalent Symbol object to maintain the identity constraint...",
	* where Symbol objects are ASN1_TRUE/FALSE objects.
	*/
      public Object readResolve() throws ObjectStreamException {
	 return ASN1_BOOLEAN(fValue);
      }
} // ASN1Boolean