Coverage Report - org.jaxen.expr.Expr
 
Classes in this File Line Coverage Branch Coverage Complexity
Expr
N/A
N/A
1
 
 1  
 /*
 2  
  * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/expr/Expr.java,v 1.14 2006/11/30 18:49:26 elharo Exp $
 3  
  * $Revision: 1.14 $
 4  
  * $Date: 2006/11/30 18:49:26 $
 5  
  *
 6  
  * ====================================================================
 7  
  *
 8  
  * Copyright 2000-2002 bob mcwhirter & James Strachan.
 9  
  * All rights reserved.
 10  
  *
 11  
  * Redistribution and use in source and binary forms, with or without
 12  
  * modification, are permitted provided that the following conditions are
 13  
  * met:
 14  
  * 
 15  
  *   * Redistributions of source code must retain the above copyright
 16  
  *     notice, this list of conditions and the following disclaimer.
 17  
  * 
 18  
  *   * Redistributions in binary form must reproduce the above copyright
 19  
  *     notice, this list of conditions and the following disclaimer in the
 20  
  *     documentation and/or other materials provided with the distribution.
 21  
  * 
 22  
  *   * Neither the name of the Jaxen Project nor the names of its
 23  
  *     contributors may be used to endorse or promote products derived 
 24  
  *     from this software without specific prior written permission.
 25  
  * 
 26  
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 27  
  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 28  
  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 29  
  * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
 30  
  * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 31  
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 32  
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 33  
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 34  
  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 35  
  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 36  
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 37  
  *
 38  
  * ====================================================================
 39  
  * This software consists of voluntary contributions made by many 
 40  
  * individuals on behalf of the Jaxen Project and was originally 
 41  
  * created by bob mcwhirter <bob@werken.com> and 
 42  
  * James Strachan <jstrachan@apache.org>.  For more information on the 
 43  
  * Jaxen Project, please see <http://www.jaxen.org/>.
 44  
  * 
 45  
  * $Id: Expr.java,v 1.14 2006/11/30 18:49:26 elharo Exp $
 46  
  */
 47  
 
 48  
 
 49  
 
 50  
 package org.jaxen.expr;
 51  
 
 52  
 import java.io.Serializable;
 53  
 import org.jaxen.Context;
 54  
 import org.jaxen.JaxenException;
 55  
 
 56  
 /**
 57  
  * Represents an XPath expression. This is production 14 in the 
 58  
  * <a href="http://www.w3.org/TR/xpath#NT-Expr">XPath 1.0 specification</a>:
 59  
  * 
 60  
  * <pre>[14]      Expr       ::=      OrExpr</pre>
 61  
  * 
 62  
  */
 63  
 public interface Expr extends Serializable
 64  
 {
 65  
     
 66  
     
 67  
     /**
 68  
      * Returns a String containing the XPath expression.
 69  
      * 
 70  
      * @return the text form of this XPath expression
 71  
      */
 72  
     String getText();
 73  
     
 74  
     /**
 75  
      * Simplifies the XPath expression. For example, the expression
 76  
      * <code>//para[1 = 1]</code> could be simplified to 
 77  
      * <code>//para</code>. In practice, this is usually a noop.
 78  
      * Jaxen does not currently perform any simplification.
 79  
      * 
 80  
      * @return the simplified expression
 81  
      */
 82  
     Expr   simplify();
 83  
     
 84  
     
 85  
     /**
 86  
      * Evaluate the expression in the given context, and return the result.
 87  
      * The result will be a <code>java.lang.Double</code> for expressions that 
 88  
      * return a number, a <code>java.lang.String</code> for expressions that 
 89  
      * return a string, a <code>java.lang.Boolean</code> for expressions that 
 90  
      * return a boolean, and a <code>java.util.List</code> for expressions that
 91  
      * return a node-set. In the latter case, the elements of the list are 
 92  
      * the actual objects from the source document model. Copies are not made.
 93  
      * 
 94  
      * @param context the context in which the expression is evaluated
 95  
      * @return an object representing the result of the evaluation
 96  
      * @throws JaxenException
 97  
      */
 98  
     Object evaluate(Context context) throws JaxenException;
 99  
     
 100  
 }