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1: /* VariableReference.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 javax.xml.namespace.QName; 41: import javax.xml.xpath.XPathVariableResolver; 42: import org.w3c.dom.Node; 43: import gnu.xml.transform.Bindings; 44: 45: public class VariableReference 46: extends Expr 47: { 48: 49: final XPathVariableResolver resolver; 50: final QName name; 51: 52: public VariableReference(XPathVariableResolver resolver, QName name) 53: { 54: this.resolver = resolver; 55: this.name = name; 56: } 57: 58: public Object evaluate(Node context, int pos, int len) 59: { 60: if (resolver != null) 61: { 62: if (resolver instanceof Bindings) 63: { 64: // Needs context to operate properly 65: return ((Bindings) resolver).get(name, context, pos, len); 66: } 67: return resolver.resolveVariable(name); 68: } 69: throw new IllegalStateException("no variable resolver"); 70: } 71: 72: public Expr clone(Object context) 73: { 74: XPathVariableResolver r = resolver; 75: if (context instanceof XPathVariableResolver) 76: { 77: r = (XPathVariableResolver) context; 78: } 79: return new VariableReference(r, name); 80: } 81: 82: public boolean references(QName var) 83: { 84: return name.equals(var); 85: } 86: 87: public String toString() 88: { 89: StringBuffer buf = new StringBuffer("$"); 90: String prefix = name.getPrefix(); 91: if (prefix != null && !"".equals(prefix)) 92: { 93: buf.append(prefix); 94: buf.append(':'); 95: } 96: buf.append(name.getLocalPart()); 97: return buf.toString(); 98: } 99: 100: }