Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||||||
PatternHandler |
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| 1.65;1.65 |
1 | /* |
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2 | * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/pattern/PatternHandler.java,v 1.6 2005/06/28 13:44:44 elharo Exp $ |
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3 | * $Revision: 1.6 $ |
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4 | * $Date: 2005/06/28 13:44:44 $ |
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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: PatternHandler.java,v 1.6 2005/06/28 13:44:44 elharo Exp $ |
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60 | */ |
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61 | ||
62 | ||
63 | package org.jaxen.pattern; |
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64 | ||
65 | import java.util.LinkedList; |
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66 | ||
67 | import org.jaxen.JaxenException; |
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68 | import org.jaxen.JaxenHandler; |
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69 | import org.jaxen.expr.Expr; |
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70 | import org.jaxen.expr.FilterExpr; |
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71 | import org.jaxen.saxpath.Axis; |
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72 | ||
73 | /** SAXPath <code>XPathHandler</code> implementation capable |
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74 | * of building Jaxen expression trees which can walk various |
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75 | * different object models. |
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76 | * |
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77 | * @author bob mcwhirter (bob@werken.com) |
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78 | */ |
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79 | public class PatternHandler extends JaxenHandler |
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80 | { |
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81 | private Pattern pattern; |
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82 | ||
83 | public PatternHandler() |
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84 | 0 | { |
85 | 0 | } |
86 | ||
87 | /** Retrieve the simplified Jaxen Pattern expression tree. |
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88 | * |
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89 | * <p> |
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90 | * This method is only valid once <code>XPathReader.parse(...)</code> |
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91 | * successfully returned. |
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92 | * </p> |
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93 | * |
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94 | * @return The Pattern expression tree. |
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95 | */ |
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96 | public Pattern getPattern() |
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97 | { |
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98 | 0 | return getPattern( true ); |
99 | } |
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100 | ||
101 | /** Retrieve the Jaxen Pattern expression tree, optionally |
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102 | * simplified. |
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103 | * |
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104 | * <p> |
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105 | * This method is only valid once <code>XPathReader.parse(...)</code> |
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106 | * successfully returned. |
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107 | * </p> |
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108 | * |
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109 | * @return The Pattern expression tree. |
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110 | */ |
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111 | public Pattern getPattern(boolean shouldSimplify) |
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112 | { |
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113 | 0 | if ( shouldSimplify && ! this.simplified ) |
114 | { |
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115 | //System.err.println("simplifyin...."); |
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116 | 0 | this.pattern.simplify(); |
117 | 0 | this.simplified = true; |
118 | } |
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119 | ||
120 | 0 | return this.pattern; |
121 | } |
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122 | ||
123 | ||
124 | ||
125 | ||
126 | public void endXPath() throws JaxenException |
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127 | { |
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128 | 0 | this.pattern = (Pattern) pop(); |
129 | ||
130 | 0 | System.out.println( "stack is: " + stack ); |
131 | ||
132 | 0 | popFrame(); |
133 | 0 | } |
134 | ||
135 | public void endPathExpr() throws JaxenException |
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136 | { |
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137 | //System.err.println("endPathExpr()"); |
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138 | ||
139 | // PathExpr ::= LocationPath |
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140 | // | FilterExpr |
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141 | // | FilterExpr / RelativeLocationPath |
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142 | // | FilterExpr // RelativeLocationPath |
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143 | // |
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144 | // If the current stack-frame has two items, it's a |
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145 | // FilterExpr and a LocationPath (of some flavor). |
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146 | // |
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147 | // If the current stack-frame has one item, it's simply |
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148 | // a FilterExpr, and more than like boils down to a |
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149 | // primary expr of some flavor. But that's for another |
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150 | // method... |
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151 | ||
152 | 0 | LinkedList frame = popFrame(); |
153 | ||
154 | 0 | System.out.println( "endPathExpr(): " + frame ); |
155 | ||
156 | 0 | push( frame.removeFirst() ); |
157 | /* |
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158 | LocationPathPattern locationPath = new LocationPathPattern(); |
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159 | push( locationPath ); |
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160 | while (! frame.isEmpty() ) |
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161 | { |
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162 | Object filter = frame.removeLast(); |
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163 | if ( filter instanceof NodeTest ) |
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164 | { |
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165 | locationPath.setNodeTest( (NodeTest) filter ); |
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166 | } |
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167 | else if ( filter instanceof FilterExpr ) |
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168 | { |
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169 | locationPath.addFilter( (FilterExpr) filter ); |
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170 | } |
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171 | else if ( filter instanceof LocationPathPattern ) |
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172 | { |
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173 | LocationPathPattern parent = (LocationPathPattern) filter; |
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174 | locationPath.setParentPattern( parent ); |
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175 | locationPath = parent; |
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176 | } |
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177 | else if ( filter != null ) |
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178 | { |
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179 | throw new JaxenException( "Unknown filter: " + filter ); |
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180 | } |
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181 | } |
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182 | */ |
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183 | 0 | } |
184 | ||
185 | public void startAbsoluteLocationPath() throws JaxenException |
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186 | { |
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187 | //System.err.println("startAbsoluteLocationPath()"); |
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188 | 0 | pushFrame(); |
189 | ||
190 | 0 | push( createAbsoluteLocationPath() ); |
191 | 0 | } |
192 | ||
193 | public void endAbsoluteLocationPath() throws JaxenException |
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194 | { |
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195 | //System.err.println("endAbsoluteLocationPath()"); |
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196 | 0 | endLocationPath(); |
197 | 0 | } |
198 | ||
199 | public void startRelativeLocationPath() throws JaxenException |
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200 | { |
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201 | //System.err.println("startRelativeLocationPath()"); |
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202 | 0 | pushFrame(); |
203 | ||
204 | 0 | push( createRelativeLocationPath() ); |
205 | 0 | } |
206 | ||
207 | public void endRelativeLocationPath() throws JaxenException |
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208 | { |
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209 | //System.err.println("endRelativeLocationPath()"); |
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210 | 0 | endLocationPath(); |
211 | 0 | } |
212 | ||
213 | protected void endLocationPath() throws JaxenException |
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214 | { |
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215 | // start at the back, its the main pattern then add everything else as |
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216 | 0 | LinkedList list = popFrame(); |
217 | ||
218 | 0 | System.out.println( "endLocationPath: " + list ); |
219 | ||
220 | 0 | LocationPathPattern locationPath = (LocationPathPattern) list.removeFirst(); |
221 | 0 | push( locationPath ); |
222 | 0 | boolean doneNodeTest = false; |
223 | 0 | while ( ! list.isEmpty() ) |
224 | { |
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225 | 0 | Object filter = list.removeFirst(); |
226 | 0 | if ( filter instanceof NodeTest ) |
227 | { |
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228 | 0 | if ( doneNodeTest ) |
229 | { |
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230 | 0 | LocationPathPattern parent = new LocationPathPattern( (NodeTest) filter ); |
231 | 0 | locationPath.setParentPattern( parent ); |
232 | 0 | locationPath = parent; |
233 | 0 | doneNodeTest = false; |
234 | } |
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235 | else |
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236 | { |
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237 | 0 | locationPath.setNodeTest( (NodeTest) filter ); |
238 | } |
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239 | } |
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240 | 0 | else if ( filter instanceof FilterExpr ) |
241 | { |
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242 | 0 | locationPath.addFilter( (FilterExpr) filter ); |
243 | } |
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244 | 0 | else if ( filter instanceof LocationPathPattern ) |
245 | { |
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246 | 0 | LocationPathPattern parent = (LocationPathPattern) filter; |
247 | 0 | locationPath.setParentPattern( parent ); |
248 | 0 | locationPath = parent; |
249 | 0 | doneNodeTest = false; |
250 | } |
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251 | } |
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252 | 0 | } |
253 | ||
254 | ||
255 | public void startNameStep(int axis, |
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256 | String prefix, |
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257 | String localName) throws JaxenException |
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258 | { |
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259 | //System.err.println("startNameStep(" + axis + ", " + prefix + ", " + localName + ")"); |
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260 | 0 | pushFrame(); |
261 | ||
262 | 0 | short nodeType = Pattern.ELEMENT_NODE; |
263 | 0 | switch ( axis ) |
264 | { |
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265 | case Axis.ATTRIBUTE: |
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266 | 0 | nodeType = Pattern.ATTRIBUTE_NODE; |
267 | 0 | break; |
268 | case Axis.NAMESPACE: |
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269 | 0 | nodeType = Pattern.NAMESPACE_NODE; |
270 | break; |
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271 | } |
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272 | ||
273 | 0 | if ( prefix != null && prefix.length() > 0 && ! prefix.equals( "*" ) ) |
274 | { |
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275 | 0 | push( new NamespaceTest( prefix, nodeType ) ); |
276 | } |
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277 | 0 | if ( localName != null && localName.length() > 0 && ! localName.equals( "*" ) ) |
278 | { |
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279 | 0 | push( new NameTest( localName, nodeType ) ); |
280 | } |
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281 | 0 | } |
282 | ||
283 | public void startTextNodeStep(int axis) throws JaxenException |
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284 | { |
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285 | //System.err.println("startTextNodeStep()"); |
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286 | 0 | pushFrame(); |
287 | ||
288 | 0 | push( new NodeTypeTest( Pattern.TEXT_NODE ) ); |
289 | 0 | } |
290 | ||
291 | public void startCommentNodeStep(int axis) throws JaxenException |
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292 | { |
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293 | //System.err.println("startCommentNodeStep()"); |
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294 | 0 | pushFrame(); |
295 | ||
296 | 0 | push( new NodeTypeTest( Pattern.COMMENT_NODE ) ); |
297 | 0 | } |
298 | ||
299 | public void startAllNodeStep(int axis) throws JaxenException |
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300 | { |
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301 | //System.err.println("startAllNodeStep()"); |
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302 | 0 | pushFrame(); |
303 | ||
304 | 0 | push( AnyNodeTest.getInstance() ); |
305 | 0 | } |
306 | ||
307 | public void startProcessingInstructionNodeStep(int axis, |
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308 | String name) throws JaxenException |
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309 | { |
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310 | //System.err.println("startProcessingInstructionStep()"); |
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311 | 0 | pushFrame(); |
312 | ||
313 | // XXXX: should we throw an exception if name is present? |
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314 | 0 | push( new NodeTypeTest( Pattern.PROCESSING_INSTRUCTION_NODE ) ); |
315 | 0 | } |
316 | ||
317 | protected void endStep() |
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318 | { |
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319 | 0 | LinkedList list = popFrame(); |
320 | 0 | if ( ! list.isEmpty() ) |
321 | { |
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322 | 0 | push( list.removeFirst() ); |
323 | ||
324 | 0 | if ( ! list.isEmpty() ) |
325 | { |
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326 | 0 | System.out.println( "List should now be empty!" + list ); |
327 | } |
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328 | } |
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329 | 0 | } |
330 | ||
331 | ||
332 | public void startUnionExpr() throws JaxenException |
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333 | { |
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334 | //System.err.println("startUnionExpr()"); |
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335 | 0 | } |
336 | ||
337 | public void endUnionExpr(boolean create) throws JaxenException |
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338 | { |
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339 | //System.err.println("endUnionExpr()"); |
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340 | ||
341 | 0 | if ( create ) |
342 | { |
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343 | //System.err.println("makeUnionExpr"); |
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344 | ||
345 | 0 | Expr rhs = (Expr) pop(); |
346 | 0 | Expr lhs = (Expr) pop(); |
347 | ||
348 | 0 | push( getXPathFactory().createUnionExpr( lhs, |
349 | rhs ) ); |
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350 | } |
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351 | 0 | } |
352 | ||
353 | protected Pattern createAbsoluteLocationPath() |
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354 | { |
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355 | 0 | return new LocationPathPattern( NodeTypeTest.DOCUMENT_TEST ); |
356 | } |
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357 | ||
358 | protected Pattern createRelativeLocationPath() |
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359 | { |
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360 | 0 | return new LocationPathPattern(); |
361 | } |
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362 | ||
363 | } |