code: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements. See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership. The ASF licenses this file
   * to you 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.
   */
  /*
   * $Id$
   */
  package org.apache.xpath.objects;
  
  /**
   * This class represents an XPath boolean object, and is capable of
   * converting the boolean to other types, such as a string.
   * @xsl.usage advanced
   */
  public class XBoolean extends XObject
  {
      static final long serialVersionUID = -2964933058866100881L;
  
    /**
     * A true boolean object so we don't have to keep creating them.
     * @xsl.usage internal
     */
    public static final XBoolean S_TRUE = new XBooleanStatic(true);
  
    /**
     * A true boolean object so we don't have to keep creating them.
     * @xsl.usage internal
     */
    public static final XBoolean S_FALSE = new XBooleanStatic(false);
  
    /** Value of the object.
     *  @serial         */
    private final boolean m_val;
  
    /**
     * Construct a XBoolean object.
     *
     * @param b Value of the boolean object
     */
    public XBoolean(boolean b)
    {
  
      super();
  
      m_val = b;
    }
    
    /**
     * Construct a XBoolean object.
     *
     * @param b Value of the boolean object
     */
    public XBoolean(Boolean b)
    {
  
      super();
  
      m_val = b.booleanValue();
      setObject(b);
    }
  
  
    /**
     * Tell that this is a CLASS_BOOLEAN.
     *
     * @return type of CLASS_BOOLEAN
     */
    public int getType()
    {
      return CLASS_BOOLEAN;
    }
  
    /**
     * Given a request type, return the equivalent string.
     * For diagnostic purposes.
     *
     * @return type string "#BOOLEAN"
     */
    public String getTypeString()
    {
      return "#BOOLEAN";
    }
  
    /**
     * Cast result object to a number.
     *
     * @return numeric value of the object value
     */
    public double num()
    {
      return m_val ? 1.0 : 0.0;
    }
  
    /**
     * Cast result object to a boolean.
     *
     * @return The object value as a boolean
     */
    public boolean bool()
    {
      return m_val;
    }
  
    /**
     * Cast result object to a string.
     *
     * @return The object's value as a string
     */
    public String str()
    {
      return m_val ? "true" : "false";
    }
  
    /**
     * Return a java object that's closest to the representation
     * that should be handed to an extension.
     *
     * @return The object's value as a java object
     */
    public Object object()
    {
      if(null == m_obj)
        setObject(m_val ? Boolean.TRUE : Boolean.FALSE);
      return m_obj;
    }
  
    /**
     * Tell if two objects are functionally equal.
     *
     * @param obj2 Object to compare to this  
     *
     * @return True if the two objects are equal
     *
     * @throws javax.xml.transform.TransformerException
     */
    public boolean equals(XObject obj2)
    {
  
      // In order to handle the 'all' semantics of 
      // nodeset comparisons, we always call the 
      // nodeset function.
      if (obj2.getType() == XObject.CLASS_NODESET)
        return obj2.equals(this);
  
      try
      {
        return m_val == obj2.bool();
      }
      catch(javax.xml.transform.TransformerException te)
      {
        throw new org.apache.xml.utils.WrappedRuntimeException(te);
      }
    }
  
  }
  