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.xml.CauchoElement;
032: import com.caucho.xml.CauchoNode;
033: import com.caucho.xml.QAttr;
034: import com.caucho.xml.QElement;
035: import com.caucho.xpath.Env;
036: import com.caucho.xpath.ExprEnvironment;
037: import com.caucho.xpath.XPathException;
038:
039: import org.w3c.dom.Attr;
040: import org.w3c.dom.Document;
041: import org.w3c.dom.Node;
042:
043: /**
044: * matches attributes of an element.
045: */
046: public class FromAttributes extends Axis {
047: public FromAttributes(AbstractPattern parent) {
048: super (parent);
049: }
050:
051: /**
052: * matches if the node is an attribute.
053: *
054: * @param node the current node
055: * @param env the variable environment
056: *
057: * @return true if the pattern matches
058: */
059: public boolean match(Node node, ExprEnvironment env)
060: throws XPathException {
061: if (!(node instanceof Attr))
062: return false;
063:
064: if (node instanceof QAttr
065: && ((QAttr) node).getNamespaceURI() == XMLNS)
066: return false;
067:
068: return _parent == null
069: || _parent.match(node.getParentNode(), env);
070: }
071:
072: /**
073: * The position of the child is the count of previous siblings
074: * matching the pattern.
075: *
076: * Technically, attributes don't have positions, but our DOM allows it.
077: */
078: public int position(Node node, Env env, AbstractPattern pattern)
079: throws XPathException {
080: int count = 1;
081:
082: for (node = node.getPreviousSibling(); node != null; node = node
083: .getPreviousSibling()) {
084: if (pattern.match(node, env))
085: count++;
086: }
087:
088: return count;
089: }
090:
091: /**
092: * counts all siblings matching the pattern.
093: */
094: public int count(Node node, Env env, AbstractPattern pattern)
095: throws XPathException {
096: int count = 0;
097:
098: CauchoElement parent = (CauchoElement) node.getParentNode();
099:
100: for (node = parent.getFirstAttribute(); node != null; node = node
101: .getNextSibling()) {
102: if (pattern.match(node, env))
103: count++;
104: }
105:
106: return count;
107: }
108:
109: /**
110: * Creates a new node iterator.
111: *
112: * @param node the starting node
113: * @param env the variable environment
114: * @param match the axis match pattern
115: *
116: * @return the node iterator
117: */
118: public NodeIterator createNodeIterator(Node node,
119: ExprEnvironment env, AbstractPattern match)
120: throws XPathException {
121: if (node instanceof CauchoNode) {
122: if (_parent == null)
123: return new AttributeIterator(null, this , node, env,
124: match);
125: else if (_parent instanceof FromRoot) {
126: if (node instanceof Document)
127: return new AttributeIterator(null, this , node, env,
128: match);
129: else
130: return new AttributeIterator(null, this , node
131: .getOwnerDocument(), env, match);
132: }
133:
134: NodeIterator parentIter;
135: parentIter = _parent.createNodeIterator(node, env, _parent
136: .copyPosition());
137:
138: return new AttributeIterator(parentIter, this , null, env,
139: match);
140: }
141:
142: if (_parent == null)
143: return new AttributeListIterator(null, env, match);
144: else if (_parent instanceof FromRoot) {
145: if (node instanceof Document)
146: return new AttributeListIterator(null, env, match);
147: else
148: return new AttributeListIterator(null, env, match);
149: }
150:
151: NodeIterator parentIter;
152: parentIter = _parent.createNodeIterator(node, env, _parent
153: .copyPosition());
154:
155: return new AttributeListIterator(parentIter, env, match);
156: }
157:
158: /**
159: * Returns the first node in the selection order.
160: *
161: * @param node the current node
162: *
163: * @return the first node
164: */
165: public Node firstNode(Node node, ExprEnvironment env) {
166: if (node instanceof QElement)
167: return ((QElement) node).getFirstAttribute();
168: else
169: return null;
170: }
171:
172: /**
173: * Returns the next node in the selection order.
174: *
175: * @param node the current node
176: * @param lastNode the last node
177: *
178: * @return the next node
179: */
180: public Node nextNode(Node node, Node lastNode) {
181: return node.getNextSibling();
182: }
183:
184: /**
185: * Returns true if the pattern is strictly ascending.
186: */
187: public boolean isStrictlyAscending() {
188: if (_parent == null)
189: return true;
190: else
191: return _parent.isStrictlyAscending();
192: }
193:
194: /**
195: * Returns true if the two patterns are equal.
196: */
197: public boolean equals(Object b) {
198: if (!(b instanceof FromAttributes))
199: return false;
200:
201: FromAttributes bPattern = (FromAttributes) b;
202:
203: return (_parent == bPattern._parent || (_parent != null && _parent
204: .equals(bPattern._parent)));
205: }
206:
207: public String toString() {
208: return getPrefix() + "attribute::";
209: }
210: }
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