Source Code Cross Referenced for FromChildren.java in  » EJB-Server-resin-3.1.5 » resin » com » caucho » xpath » pattern » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server resin 3.1.5 » resin » com.caucho.xpath.pattern 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
003:         *
004:         * This file is part of Resin(R) Open Source
005:         *
006:         * Each copy or derived work must preserve the copyright notice and this
007:         * notice unmodified.
008:         *
009:         * Resin Open Source is free software; you can redistribute it and/or modify
010:         * it under the terms of the GNU General Public License as published by
011:         * the Free Software Foundation; either version 2 of the License, or
012:         * (at your option) any later version.
013:         *
014:         * Resin Open Source is distributed in the hope that it will be useful,
015:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
016:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
017:         * of NON-INFRINGEMENT.  See the GNU General Public License for more
018:         * details.
019:         *
020:         * You should have received a copy of the GNU General Public License
021:         * along with Resin Open Source; if not, write to the
022:         *   Free SoftwareFoundation, Inc.
023:         *   59 Temple Place, Suite 330
024:         *   Boston, MA 02111-1307  USA
025:         *
026:         * @author Scott Ferguson
027:         */
028:
029:        package com.caucho.xpath.pattern;
030:
031:        import com.caucho.xpath.Env;
032:        import com.caucho.xpath.ExprEnvironment;
033:        import com.caucho.xpath.XPathException;
034:
035:        import org.w3c.dom.Node;
036:
037:        /**
038:         * matches child nodes.
039:         */
040:        public class FromChildren extends Axis {
041:            public FromChildren(AbstractPattern parent) {
042:                super (parent);
043:            }
044:
045:            /**
046:             * Matches all nodes except attributes and tests the parent pattern
047:             * with the parent node.
048:             *
049:             * @param node the current node
050:             * @param env the variable environment
051:             *
052:             * @return true if the pattern matches
053:             */
054:            public boolean match(Node node, ExprEnvironment env)
055:                    throws XPathException {
056:                if (node == null)
057:                    return false;
058:
059:                return _parent == null
060:                        || _parent.match(node.getParentNode(), env);
061:            }
062:
063:            /**
064:             * The position of the child is the count of previous siblings
065:             * matching the pattern.
066:             *
067:             * @param node the current node
068:             * @param env the variable environment
069:             * @param pattern the position pattern
070:             *
071:             * @return the node's position.
072:             */
073:            public int position(Node node, Env env, AbstractPattern pattern)
074:                    throws XPathException {
075:                int count = 1;
076:
077:                for (node = node.getPreviousSibling(); node != null; node = node
078:                        .getPreviousSibling()) {
079:                    if (pattern == null || pattern.match(node, env))
080:                        count++;
081:                }
082:
083:                return count;
084:            }
085:
086:            /**
087:             * Counts all siblings matching the pattern.
088:             *
089:             * @param node the current node
090:             * @param env the variable environment
091:             * @param pattern the position pattern
092:             *
093:             * @return the count of the node list.
094:             */
095:            public int count(Node node, Env env, AbstractPattern pattern)
096:                    throws XPathException {
097:                int count = 0;
098:
099:                for (node = node.getParentNode().getFirstChild(); node != null; node = node
100:                        .getNextSibling()) {
101:                    if (pattern.match(node, env))
102:                        count++;
103:                }
104:
105:                return count;
106:            }
107:
108:            /**
109:             * Returns the first node in the selection order.
110:             *
111:             * @param node the current node
112:             *
113:             * @return the first node
114:             */
115:            public Node firstNode(Node node, ExprEnvironment env) {
116:                return node.getFirstChild();
117:            }
118:
119:            /**
120:             * Returns the next node in the selection order.
121:             *
122:             * @param node the current node
123:             * @param node the last node
124:             *
125:             * @return the next node
126:             */
127:            public Node nextNode(Node node, Node lastNode) {
128:                return node.getNextSibling();
129:            }
130:
131:            /**
132:             * Returns true if the pattern nodes on a single level.
133:             */
134:            boolean isSingleLevel() {
135:                return _parent == null || _parent.isSingleLevel();
136:            }
137:
138:            /**
139:             * Returns true if the pattern is strictly ascending.
140:             */
141:            public boolean isStrictlyAscending() {
142:                if (_parent == null)
143:                    return true;
144:                else {
145:                    return _parent.isStrictlyAscending();
146:                }
147:            }
148:
149:            /**
150:             * Returns true if the two patterns are equal.
151:             */
152:            public boolean equals(Object b) {
153:                if (!(b instanceof  FromChildren))
154:                    return false;
155:
156:                FromChildren bPattern = (FromChildren) b;
157:
158:                return (_parent == bPattern._parent || (_parent != null && _parent
159:                        .equals(bPattern._parent)));
160:            }
161:
162:            public String toString() {
163:                return getPrefix() + "child::";
164:            }
165:        }
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