1 /* 2 * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/expr/DefaultLocationPath.java,v 1.24 2005/04/06 09:09:19 elharo Exp $ 3 * $Revision: 1.24 $ 4 * $Date: 2005/04/06 09:09:19 $ 5 * 6 * ==================================================================== 7 * 8 * Copyright (C) 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 13 * are met: 14 * 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions, and the following disclaimer. 17 * 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions, and the disclaimer that follows 20 * these conditions in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * 3. The name "Jaxen" must not be used to endorse or promote products 24 * derived from this software without prior written permission. For 25 * written permission, please contact license@jaxen.org. 26 * 27 * 4. Products derived from this software may not be called "Jaxen", nor 28 * may "Jaxen" appear in their name, without prior written permission 29 * from the Jaxen Project Management (pm@jaxen.org). 30 * 31 * In addition, we request (but do not require) that you include in the 32 * end-user documentation provided with the redistribution and/or in the 33 * software itself an acknowledgement equivalent to the following: 34 * "This product includes software developed by the 35 * Jaxen Project (http://www.jaxen.org/)." 36 * Alternatively, the acknowledgment may be graphical using the logos 37 * available at http://www.jaxen.org/ 38 * 39 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 40 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 41 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 42 * DISCLAIMED. IN NO EVENT SHALL THE Jaxen AUTHORS OR THE PROJECT 43 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 45 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 46 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 47 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 48 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 49 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * ==================================================================== 53 * This software consists of voluntary contributions made by many 54 * individuals on behalf of the Jaxen Project and was originally 55 * created by bob mcwhirter <bob@werken.com> and 56 * James Strachan <jstrachan@apache.org>. For more information on the 57 * Jaxen Project, please see <http://www.jaxen.org/>. 58 * 59 * $Id: DefaultLocationPath.java,v 1.24 2005/04/06 09:09:19 elharo Exp $ 60 */ 61 package org.jaxen.expr; 62 63 import java.util.ArrayList; 64 import java.util.Collections; 65 import java.util.Iterator; 66 import java.util.LinkedList; 67 import java.util.List; 68 69 import org.jaxen.Context; 70 import org.jaxen.ContextSupport; 71 import org.jaxen.JaxenException; 72 73 abstract class DefaultLocationPath extends DefaultExpr implements LocationPath 74 { 75 private List steps; 76 77 public DefaultLocationPath() 78 { 79 this.steps = new LinkedList(); 80 } 81 82 public void addStep(Step step) 83 { 84 getSteps().add(step); 85 } 86 87 public List getSteps() 88 { 89 return this.steps; 90 } 91 92 public Expr simplify() 93 { 94 Iterator stepIter = getSteps().iterator(); 95 Step eachStep = null; 96 while (stepIter.hasNext()) 97 { 98 eachStep = (Step) stepIter.next(); 99 eachStep.simplify(); 100 } 101 return this; 102 } 103 104 public String getText() 105 { 106 StringBuffer buf = new StringBuffer(); 107 Iterator stepIter = getSteps().iterator(); 108 while (stepIter.hasNext()) 109 { 110 buf.append(((Step) stepIter.next()).getText()); 111 if (stepIter.hasNext()) 112 { 113 buf.append("/"); 114 } 115 } 116 return buf.toString(); 117 } 118 119 public String toString() 120 { 121 StringBuffer buf = new StringBuffer(); 122 Iterator stepIter = getSteps().iterator(); 123 while (stepIter.hasNext()) 124 { 125 buf.append(stepIter.next().toString()); 126 if (stepIter.hasNext()) 127 { 128 buf.append("/"); 129 } 130 } 131 return buf.toString(); 132 } 133 134 public boolean isAbsolute() 135 { 136 return false; 137 } 138 139 public Object evaluate(Context context) throws JaxenException 140 { 141 List nodeSet = context.getNodeSet(); 142 List contextNodeSet = new ArrayList(nodeSet.size()); 143 contextNodeSet.addAll(nodeSet); 144 ContextSupport support = context.getContextSupport(); 145 Context stepContext = new Context(support); 146 Iterator stepIter = getSteps().iterator(); 147 while ( stepIter.hasNext() ) 148 { 149 Step eachStep = (Step) stepIter.next(); 150 stepContext.setNodeSet(contextNodeSet); 151 contextNodeSet = eachStep.evaluate(stepContext); 152 // now we need to reverse the list if this is a reverse axis 153 // ???? should create an isReverseAxis method in Step to handle this 154 int axis = eachStep.getAxis(); 155 if (axis == org.jaxen.saxpath.Axis.PRECEDING 156 || axis == org.jaxen.saxpath.Axis.PRECEDING_SIBLING 157 || axis == org.jaxen.saxpath.Axis.ANCESTOR 158 || axis == org.jaxen.saxpath.Axis.ANCESTOR_OR_SELF) { 159 Collections.reverse(contextNodeSet); 160 } 161 } 162 163 if (getSteps().size() > 1) { 164 Collections.sort(contextNodeSet, new NodeComparator(support.getNavigator())); 165 } 166 167 return contextNodeSet; 168 } 169 170 } 171