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      1 /*
      2  * Licensed to the Apache Software Foundation (ASF) under one
      3  * or more contributor license agreements. See the NOTICE file
      4  * distributed with this work for additional information
      5  * regarding copyright ownership. The ASF licenses this file
      6  * to you under the Apache License, Version 2.0 (the  "License");
      7  * you may not use this file except in compliance with the License.
      8  * You may obtain a copy of the License at
      9  *
     10  *     http://www.apache.org/licenses/LICENSE-2.0
     11  *
     12  * Unless required by applicable law or agreed to in writing, software
     13  * distributed under the License is distributed on an "AS IS" BASIS,
     14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     15  * See the License for the specific language governing permissions and
     16  * limitations under the License.
     17  */
     18 /*
     19  * $Id: Or.java 468655 2006-10-28 07:12:06Z minchau $
     20  */
     21 package org.apache.xpath.operations;
     22 
     23 import org.apache.xpath.XPathContext;
     24 import org.apache.xpath.objects.XBoolean;
     25 import org.apache.xpath.objects.XObject;
     26 
     27 /**
     28  * The 'or' operation expression executer.
     29  */
     30 public class Or extends Operation
     31 {
     32     static final long serialVersionUID = -644107191353853079L;
     33 
     34   /**
     35    * OR two expressions and return the boolean result. Override
     36    * superclass method for optimization purposes.
     37    *
     38    * @param xctxt The runtime execution context.
     39    *
     40    * @return {@link org.apache.xpath.objects.XBoolean#S_TRUE} or
     41    * {@link org.apache.xpath.objects.XBoolean#S_FALSE}.
     42    *
     43    * @throws javax.xml.transform.TransformerException
     44    */
     45   public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
     46   {
     47 
     48     XObject expr1 = m_left.execute(xctxt);
     49 
     50     if (!expr1.bool())
     51     {
     52       XObject expr2 = m_right.execute(xctxt);
     53 
     54       return expr2.bool() ? XBoolean.S_TRUE : XBoolean.S_FALSE;
     55     }
     56     else
     57       return XBoolean.S_TRUE;
     58   }
     59 
     60   /**
     61    * Evaluate this operation directly to a boolean.
     62    *
     63    * @param xctxt The runtime execution context.
     64    *
     65    * @return The result of the operation as a boolean.
     66    *
     67    * @throws javax.xml.transform.TransformerException
     68    */
     69   public boolean bool(XPathContext xctxt)
     70           throws javax.xml.transform.TransformerException
     71   {
     72     return (m_left.bool(xctxt) || m_right.bool(xctxt));
     73   }
     74 
     75 }
     76