| Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||||||
| PredicateSet |
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| 2.25;2.25 |
| 1 | /* |
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| 2 | * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/expr/PredicateSet.java,v 1.19 2005/06/28 13:44:44 elharo Exp $ |
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| 3 | * $Revision: 1.19 $ |
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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: PredicateSet.java,v 1.19 2005/06/28 13:44:44 elharo Exp $ |
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| 60 | */ |
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| 61 | ||
| 62 | ||
| 63 | ||
| 64 | package org.jaxen.expr; |
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| 65 | ||
| 66 | import java.io.Serializable; |
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| 67 | import java.util.ArrayList; |
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| 68 | import java.util.Collections; |
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| 69 | import java.util.Iterator; |
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| 70 | import java.util.List; |
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| 71 | import org.jaxen.Context; |
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| 72 | import org.jaxen.ContextSupport; |
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| 73 | import org.jaxen.JaxenException; |
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| 74 | import org.jaxen.function.BooleanFunction; |
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| 75 | ||
| 76 | public class PredicateSet implements Serializable |
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| 77 | { |
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| 78 | private List predicates; |
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| 79 | ||
| 80 | public PredicateSet() |
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| 81 | 29502 | { |
| 82 | 29502 | this.predicates = Collections.EMPTY_LIST; |
| 83 | 29502 | } |
| 84 | ||
| 85 | public void addPredicate(Predicate predicate) |
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| 86 | { |
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| 87 | 2346 | if ( this.predicates == Collections.EMPTY_LIST ) |
| 88 | { |
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| 89 | 2268 | this.predicates = new ArrayList(); |
| 90 | } |
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| 91 | ||
| 92 | 2346 | this.predicates.add( predicate ); |
| 93 | 2346 | } |
| 94 | ||
| 95 | public List getPredicates() |
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| 96 | { |
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| 97 | 13560 | return this.predicates; |
| 98 | } |
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| 99 | ||
| 100 | public void simplify() |
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| 101 | { |
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| 102 | 29010 | Iterator predIter = this.predicates.iterator(); |
| 103 | 29010 | Predicate eachPred = null; |
| 104 | ||
| 105 | 31302 | while ( predIter.hasNext() ) |
| 106 | { |
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| 107 | 2292 | eachPred = (Predicate) predIter.next(); |
| 108 | 2292 | eachPred.simplify(); |
| 109 | } |
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| 110 | 29010 | } |
| 111 | ||
| 112 | public String getText() |
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| 113 | { |
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| 114 | 72 | StringBuffer buf = new StringBuffer(); |
| 115 | ||
| 116 | 72 | Iterator predIter = this.predicates.iterator(); |
| 117 | 72 | Predicate eachPred = null; |
| 118 | ||
| 119 | 72 | while ( predIter.hasNext() ) |
| 120 | { |
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| 121 | 0 | eachPred = (Predicate) predIter.next(); |
| 122 | 0 | buf.append( eachPred.getText() ); |
| 123 | } |
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| 124 | ||
| 125 | 72 | return buf.toString(); |
| 126 | } |
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| 127 | ||
| 128 | // FIXME: Note - this could be *MUCH* more efficient |
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| 129 | // currently this creates many redundant collections and should halt |
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| 130 | // evaluation on the first matching item. |
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| 131 | protected boolean evaluateAsBoolean(List contextNodeSet, |
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| 132 | ContextSupport support) throws JaxenException |
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| 133 | { |
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| 134 | 0 | List result = evaluatePredicates( contextNodeSet, support ); |
| 135 | ||
| 136 | 0 | return ! result.isEmpty(); |
| 137 | } |
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| 138 | ||
| 139 | protected List evaluatePredicates(List contextNodeSet, ContextSupport support) |
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| 140 | throws JaxenException { |
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| 141 | // Easy way out (necessary) |
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| 142 | 54288 | if (predicates.size() == 0) { |
| 143 | 38118 | return contextNodeSet; |
| 144 | } |
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| 145 | 16170 | Iterator predIter = predicates.iterator(); |
| 146 | ||
| 147 | // initial list to filter |
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| 148 | 16170 | List nodes2Filter = contextNodeSet; |
| 149 | // apply all predicates |
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| 150 | 32406 | while(predIter.hasNext()) { |
| 151 | 16248 | nodes2Filter = |
| 152 | applyPredicate((Predicate)predIter.next(), nodes2Filter, support); |
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| 153 | } |
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| 154 | ||
| 155 | 16158 | return nodes2Filter; |
| 156 | } |
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| 157 | ||
| 158 | public List applyPredicate(Predicate predicate, List nodes2Filter, ContextSupport support) |
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| 159 | throws JaxenException { |
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| 160 | 16248 | final int nodes2FilterSize = nodes2Filter.size(); |
| 161 | 16248 | List filteredNodes = new ArrayList(nodes2FilterSize); |
| 162 | // Set up a dummy context with a list to hold each node |
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| 163 | 16248 | Context predContext = new Context(support); |
| 164 | 16248 | List tempList = new ArrayList(1); |
| 165 | 16248 | predContext.setNodeSet(tempList); |
| 166 | // loop through the current nodes to filter and add to the |
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| 167 | // filtered nodes list if the predicate succeeds |
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| 168 | 39780 | for (int i = 0; i < nodes2FilterSize; ++i) { |
| 169 | 23544 | Object contextNode = nodes2Filter.get(i); |
| 170 | 23544 | tempList.clear(); |
| 171 | 23544 | tempList.add(contextNode); |
| 172 | 23544 | predContext.setNodeSet(tempList); |
| 173 | // ???? |
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| 174 | 23544 | predContext.setPosition(i + 1); |
| 175 | 23544 | predContext.setSize(nodes2FilterSize); |
| 176 | 23544 | Object predResult = predicate.evaluate(predContext); |
| 177 | 23532 | if (predResult instanceof Number) { |
| 178 | // Here we assume nodes are in forward or reverse order |
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| 179 | // as appropriate for axis |
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| 180 | 4482 | int proximity = ((Number) predResult).intValue(); |
| 181 | 4482 | if (proximity == (i + 1)) { |
| 182 | 942 | filteredNodes.add(contextNode); |
| 183 | } |
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| 184 | } |
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| 185 | else { |
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| 186 | 19050 | Boolean includes = |
| 187 | BooleanFunction.evaluate(predResult, |
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| 188 | predContext.getNavigator()); |
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| 189 | 19050 | if (includes.booleanValue()) { |
| 190 | 2922 | filteredNodes.add(contextNode); |
| 191 | } |
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| 192 | } |
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| 193 | } |
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| 194 | 16236 | return filteredNodes; |
| 195 | } |
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| 196 | } |