Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||||||
JavaBeanXPath |
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1 | /* |
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2 | * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/javabean/JavaBeanXPath.java,v 1.4 2005/06/28 13:44:46 elharo Exp $ |
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3 | * $Revision: 1.4 $ |
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4 | * $Date: 2005/06/28 13:44:46 $ |
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5 | * |
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6 | * ==================================================================== |
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7 | * |
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8 | * Copyright (C) 2000-2002 bob mcwhirter & James Strachan. |
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9 | * All rights reserved. |
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10 | * |
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11 | * Redistribution and use in source and binary forms, with or without |
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12 | * modification, are permitted provided that the following conditions |
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13 | * are met: |
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14 | * |
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15 | * 1. Redistributions of source code must retain the above copyright |
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16 | * notice, this list of conditions, and the following disclaimer. |
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17 | * |
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18 | * 2. Redistributions in binary form must reproduce the above copyright |
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19 | * notice, this list of conditions, and the disclaimer that follows |
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20 | * these conditions in the documentation and/or other materials |
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21 | * provided with the distribution. |
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22 | * |
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23 | * 3. The name "Jaxen" must not be used to endorse or promote products |
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24 | * derived from this software without prior written permission. For |
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25 | * written permission, please contact license@jaxen.org. |
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26 | * |
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27 | * 4. Products derived from this software may not be called "Jaxen", nor |
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28 | * may "Jaxen" appear in their name, without prior written permission |
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29 | * from the Jaxen Project Management (pm@jaxen.org). |
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30 | * |
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31 | * In addition, we request (but do not require) that you include in the |
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32 | * end-user documentation provided with the redistribution and/or in the |
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33 | * software itself an acknowledgement equivalent to the following: |
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34 | * "This product includes software developed by the |
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35 | * Jaxen Project <http://www.jaxen.org/>." |
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36 | * Alternatively, the acknowledgment may be graphical using the logos |
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37 | * available at http://www.jaxen.org/ |
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38 | * |
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39 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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40 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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41 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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42 | * DISCLAIMED. IN NO EVENT SHALL THE Jaxen AUTHORS OR THE PROJECT |
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43 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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44 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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45 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
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46 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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47 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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48 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
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49 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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50 | * SUCH DAMAGE. |
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51 | * |
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52 | * ==================================================================== |
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53 | * This software consists of voluntary contributions made by many |
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54 | * individuals on behalf of the Jaxen Project and was originally |
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55 | * created by bob mcwhirter <bob@werken.com> and |
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56 | * James Strachan <jstrachan@apache.org>. For more information on the |
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57 | * Jaxen Project, please see <http://www.jaxen.org/>. |
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58 | * |
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59 | * $Id: JavaBeanXPath.java,v 1.4 2005/06/28 13:44:46 elharo Exp $ |
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60 | */ |
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61 | ||
62 | package org.jaxen.javabean; |
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63 | ||
64 | import org.jaxen.Context; |
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65 | import org.jaxen.BaseXPath; |
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66 | import org.jaxen.JaxenException; |
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67 | ||
68 | import java.util.List; |
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69 | import java.util.ArrayList; |
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70 | import java.util.Collection; |
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71 | import java.util.Iterator; |
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72 | ||
73 | /** An XPath implementation for JavaBeans. |
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74 | * |
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75 | * <p>This is the main entry point for matching an XPath against a JavaBean |
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76 | * tree. You create a compiled XPath object, then match it against |
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77 | * one or more context nodes using the {@link #selectNodes(Object)} |
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78 | * method, as in the following example:</p> |
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79 | * |
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80 | * <pre> |
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81 | * Node node = ...; |
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82 | * XPath path = new JavaBeanXPath("a/b/c"); |
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83 | * List results = path.selectNodes(node); |
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84 | * </pre> |
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85 | * |
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86 | * @see BaseXPath |
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87 | * |
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88 | * @author <a href="mailto:bob@werken.com">bob mcwhirter</a> |
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89 | * |
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90 | * @version $Revision: 1.4 $ |
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91 | */ |
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92 | public class JavaBeanXPath extends BaseXPath |
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93 | { |
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94 | /** Construct given an XPath expression string. |
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95 | * |
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96 | * @param xpathExpr The XPath expression. |
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97 | * |
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98 | * @throws JaxenException if there is a syntax error while |
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99 | * parsing the expression |
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100 | */ |
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101 | public JavaBeanXPath(String xpathExpr) throws JaxenException |
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102 | { |
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103 | 6 | super( xpathExpr, DocumentNavigator.getInstance() ); |
104 | 6 | } |
105 | ||
106 | protected Context getContext(Object node) |
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107 | { |
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108 | 6 | if ( node instanceof Context ) |
109 | { |
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110 | 0 | return (Context) node; |
111 | } |
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112 | ||
113 | 6 | if ( node instanceof Element ) |
114 | { |
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115 | 0 | return super.getContext( node ); |
116 | } |
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117 | ||
118 | 6 | if ( node instanceof List ) |
119 | { |
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120 | 0 | List newList = new ArrayList(); |
121 | ||
122 | 0 | for ( Iterator listIter = ((List)node).iterator(); |
123 | 0 | listIter.hasNext(); ) |
124 | { |
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125 | 0 | newList.add( new Element( null, "root", listIter.next() ) ); |
126 | } |
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127 | ||
128 | 0 | return super.getContext( newList ); |
129 | } |
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130 | ||
131 | 6 | return super.getContext( new Element( null, "root", node ) ); |
132 | } |
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133 | ||
134 | public Object evaluate(Object node) |
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135 | throws JaxenException |
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136 | { |
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137 | 6 | Object result = super.evaluate( node ); |
138 | ||
139 | 6 | if ( result instanceof Element ) |
140 | { |
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141 | 0 | return ((Element)result).getObject(); |
142 | } |
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143 | 6 | else if ( result instanceof Collection ) |
144 | { |
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145 | 6 | List newList = new ArrayList(); |
146 | ||
147 | 6 | for ( Iterator listIter = ((Collection)result).iterator(); |
148 | 24 | listIter.hasNext(); ) |
149 | { |
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150 | 18 | Object member = listIter.next(); |
151 | ||
152 | 18 | if ( member instanceof Element ) |
153 | { |
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154 | 18 | newList.add( ((Element)member).getObject() ); |
155 | } |
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156 | else |
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157 | { |
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158 | 0 | newList.add( member ); |
159 | } |
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160 | } |
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161 | ||
162 | 6 | return newList; |
163 | } |
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164 | ||
165 | 0 | return result; |
166 | } |
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167 | } |