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: * The self axis matches the current node.
039: */
040: public class FromSelf extends Axis {
041: public FromSelf(AbstractPattern parent) {
042: super (parent);
043: }
044:
045: /**
046: * The self axis always matches.
047: *
048: * @param node the current node
049: * @param env the variable environment
050: *
051: * @return true
052: */
053: public boolean match(Node node, ExprEnvironment env)
054: throws XPathException {
055: return _parent == null || _parent.match(node, env);
056: }
057:
058: /**
059: * Only one node in the self axis.
060: */
061: public int position(Node node, Env env, AbstractPattern pattern) {
062: return 1;
063: }
064:
065: /**
066: * Only one node in the self axis.
067: */
068: public int count(Node node, Env env, AbstractPattern pattern) {
069: return 1;
070: }
071:
072: /**
073: * Returns the first node in the selection order.
074: *
075: * @param node the current node
076: *
077: * @return the first node
078: */
079: public Node firstNode(Node node, ExprEnvironment env) {
080: return node;
081: }
082:
083: /**
084: * Returns the next node in the selection order.
085: *
086: * @param node the current node
087: * @param lastNode the last node
088: *
089: * @return the next node
090: */
091: public Node nextNode(Node node, Node lastNode) {
092: return null;
093: }
094:
095: /**
096: * Returns true if the two patterns are equal.
097: */
098: public boolean equals(Object b) {
099: if (!(b instanceof FromSelf))
100: return false;
101:
102: FromSelf bPattern = (FromSelf) b;
103:
104: return (_parent == bPattern._parent || (_parent != null && _parent
105: .equals(bPattern._parent)));
106: }
107:
108: public String toString() {
109: return getPrefix() + "self::";
110: }
111: }
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