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.operations;
  
  import org.apache.xpath.XPathContext;
  import org.apache.xpath.objects.XBoolean;
  import org.apache.xpath.objects.XObject;
  
  /**
   * The 'and' operation expression executer.
   */
  public class And extends Operation
  {
      static final long serialVersionUID = 392330077126534022L;
  
    /**
     * AND two expressions and return the boolean result. Override
     * superclass method for optimization purposes.
     *
     * @param xctxt The runtime execution context.
     *
     * @return {@link org.apache.xpath.objects.XBoolean#S_TRUE} or 
     * {@link org.apache.xpath.objects.XBoolean#S_FALSE}.
     *
     * @throws javax.xml.transform.TransformerException
     */
    public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
    {
  
      XObject expr1 = m_left.execute(xctxt);
  
      if (expr1.bool())
      {
        XObject expr2 = m_right.execute(xctxt);
  
        return expr2.bool() ? XBoolean.S_TRUE : XBoolean.S_FALSE;
      }
      else
        return XBoolean.S_FALSE;
    }
    
    /**
     * Evaluate this operation directly to a boolean.
     *
     * @param xctxt The runtime execution context.
     *
     * @return The result of the operation as a boolean.
     *
     * @throws javax.xml.transform.TransformerException
     */
    public boolean bool(XPathContext xctxt)
            throws javax.xml.transform.TransformerException
    {
      return (m_left.bool(xctxt) && m_right.bool(xctxt));
    }
  
  }
  