1 /* 2 * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/expr/DefaultPathExpr.java,v 1.10 2003/08/26 19:54:15 ssanders Exp $ 3 * $Revision: 1.10 $ 4 * $Date: 2003/08/26 19:54:15 $ 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: DefaultPathExpr.java,v 1.10 2003/08/26 19:54:15 ssanders Exp $ 60 */ 61 62 package org.jaxen.expr; 63 64 65 import org.jaxen.Context; 66 import org.jaxen.JaxenException; 67 68 69 class DefaultPathExpr extends DefaultExpr implements PathExpr { 70 71 private Expr filterExpr; 72 private LocationPath locationPath; 73 74 public DefaultPathExpr(Expr filterExpr, 75 LocationPath locationPath) { 76 this.filterExpr = filterExpr; 77 this.locationPath = locationPath; 78 } 79 80 public Expr getFilterExpr() { 81 return this.filterExpr; 82 } 83 84 85 public void setFilterExpr(Expr filterExpr) { 86 this.filterExpr = filterExpr; 87 } 88 89 90 public LocationPath getLocationPath() { 91 return this.locationPath; 92 } 93 94 95 public String toString() { 96 if (getLocationPath() != null) { 97 return "[(DefaultPathExpr): " + getFilterExpr() + ", " + getLocationPath() + "]"; 98 } 99 100 return "[(DefaultPathExpr): " + getFilterExpr() + "]"; 101 } 102 103 104 public String getText() { 105 StringBuffer buf = new StringBuffer(); 106 107 if (getFilterExpr() != null) { 108 buf.append(getFilterExpr().getText()); 109 } 110 111 if (getLocationPath() != null) { 112 buf.append(getLocationPath().getText()); 113 } 114 115 return buf.toString(); 116 } 117 118 119 public Expr simplify() { 120 if (getFilterExpr() != null) { 121 setFilterExpr(getFilterExpr().simplify()); 122 } 123 124 if (getLocationPath() != null) { 125 getLocationPath().simplify(); 126 } 127 128 if (getFilterExpr() == null && getLocationPath() == null) { 129 return null; 130 } 131 132 133 if (getLocationPath() == null) { 134 return getFilterExpr(); 135 } 136 137 if (getFilterExpr() == null) { 138 return getLocationPath(); 139 } 140 141 return this; 142 } 143 144 public Object evaluate(Context context) throws JaxenException { 145 Object results = null; 146 Context pathContext = null; 147 if (getFilterExpr() != null) { 148 results = getFilterExpr().evaluate(context); 149 pathContext = new Context(context.getContextSupport()); 150 pathContext.setNodeSet(convertToList(results)); 151 } 152 if (getLocationPath() != null) { 153 return getLocationPath().evaluate(pathContext); 154 } 155 return results; 156 } 157 158 public void accept(Visitor visitor) { 159 visitor.visit(this); 160 } 161 } 162