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1: /* Root.java -- 2: Copyright (C) 2004 Free Software Foundation, Inc. 3: 4: This file is part of GNU Classpath. 5: 6: GNU Classpath is free software; you can redistribute it and/or modify 7: it under the terms of the GNU General Public License as published by 8: the Free Software Foundation; either version 2, or (at your option) 9: any later version. 10: 11: GNU Classpath is distributed in the hope that it will be useful, but 12: WITHOUT ANY WARRANTY; without even the implied warranty of 13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14: General Public License for more details. 15: 16: You should have received a copy of the GNU General Public License 17: along with GNU Classpath; see the file COPYING. If not, write to the 18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19: 02110-1301 USA. 20: 21: Linking this library statically or dynamically with other modules is 22: making a combined work based on this library. Thus, the terms and 23: conditions of the GNU General Public License cover the whole 24: combination. 25: 26: As a special exception, the copyright holders of this library give you 27: permission to link this library with independent modules to produce an 28: executable, regardless of the license terms of these independent 29: modules, and to copy and distribute the resulting executable under 30: terms of your choice, provided that you also meet, for each linked 31: independent module, the terms and conditions of the license of that 32: module. An independent module is a module which is not derived from 33: or based on this library. If you modify this library, you may extend 34: this exception to your version of the library, but you are not 35: obligated to do so. If you do not wish to do so, delete this 36: exception statement from your version. */ 37: 38: package gnu.xml.xpath; 39: 40: import java.util.Collection; 41: import java.util.Collections; 42: import javax.xml.namespace.QName; 43: import org.w3c.dom.Document; 44: import org.w3c.dom.Node; 45: 46: /** 47: * Expression that evaluates to the document root. 48: * 49: * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a> 50: */ 51: public final class Root 52: extends Path 53: { 54: 55: public boolean matches(Node node) 56: { 57: return (node.getNodeType() == Node.DOCUMENT_NODE); 58: } 59: 60: public Object evaluate(Node context, int pos, int len) 61: { 62: return evaluate(context, Collections.EMPTY_SET); 63: } 64: 65: Collection evaluate(Node context, Collection ns) 66: { 67: Document doc = (context instanceof Document) ? (Document) context : 68: context.getOwnerDocument(); 69: return Collections.singleton(doc); 70: } 71: 72: public Expr clone(Object context) 73: { 74: return new Root(); 75: } 76: 77: public boolean references(QName var) 78: { 79: return false; 80: } 81: 82: public String toString() 83: { 84: return "/"; 85: } 86: 87: }