| /* DomXPathExpression.java -- |
| Copyright (C) 2004 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| package gnu.xml.dom; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.List; |
| import javax.xml.namespace.QName; |
| import javax.xml.xpath.XPath; |
| import javax.xml.xpath.XPathConstants; |
| import javax.xml.xpath.XPathExpression; |
| import javax.xml.xpath.XPathExpressionException; |
| import javax.xml.xpath.XPathFactory; |
| import org.w3c.dom.DOMException; |
| import org.w3c.dom.Node; |
| import org.w3c.dom.xpath.XPathException; |
| import org.w3c.dom.xpath.XPathNSResolver; |
| import org.w3c.dom.xpath.XPathResult; |
| import gnu.xml.xpath.DocumentOrderComparator; |
| |
| /** |
| * An XPath expression. |
| * |
| * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a> |
| */ |
| class DomXPathExpression |
| implements org.w3c.dom.xpath.XPathExpression |
| { |
| |
| final DomDocument doc; |
| final XPathExpression expression; |
| final XPathNSResolver resolver; |
| |
| DomXPathExpression(DomDocument doc, String expression, |
| XPathNSResolver resolver) |
| throws XPathException |
| { |
| this.doc = doc; |
| this.resolver = resolver; |
| |
| XPathFactory factory = XPathFactory.newInstance(); |
| XPath xpath = factory.newXPath(); |
| if (resolver != null) |
| { |
| xpath.setNamespaceContext(new DomNSResolverContext(resolver)); |
| } |
| try |
| { |
| this.expression = xpath.compile(expression); |
| } |
| catch (XPathExpressionException e) |
| { |
| throw new XPathException(XPathException.INVALID_EXPRESSION_ERR, |
| e.getMessage ()); |
| } |
| } |
| |
| public Object evaluate(Node contextNode, short type, Object result) |
| throws XPathException, DOMException |
| { |
| try |
| { |
| QName typeName = null; |
| switch (type) |
| { |
| case XPathResult.BOOLEAN_TYPE: |
| typeName = XPathConstants.BOOLEAN; |
| break; |
| case XPathResult.NUMBER_TYPE: |
| typeName = XPathConstants.NUMBER; |
| break; |
| case XPathResult.STRING_TYPE: |
| typeName = XPathConstants.STRING; |
| break; |
| case XPathResult.ANY_UNORDERED_NODE_TYPE: |
| case XPathResult.FIRST_ORDERED_NODE_TYPE: |
| typeName = XPathConstants.NODE; |
| break; |
| case XPathResult.UNORDERED_NODE_ITERATOR_TYPE: |
| case XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE: |
| case XPathResult.ORDERED_NODE_ITERATOR_TYPE: |
| case XPathResult.ORDERED_NODE_SNAPSHOT_TYPE: |
| typeName = XPathConstants.NODESET; |
| break; |
| default: |
| throw new XPathException(XPathException.TYPE_ERR, null); |
| } |
| Object val = expression.evaluate(contextNode, typeName); |
| switch (type) |
| { |
| case XPathResult.ORDERED_NODE_ITERATOR_TYPE: |
| case XPathResult.ORDERED_NODE_SNAPSHOT_TYPE: |
| // Sort the nodes |
| List ns = new ArrayList((Collection) val); |
| Collections.sort(ns, new DocumentOrderComparator()); |
| val = ns; |
| } |
| return new DomXPathResult(val, type); |
| } |
| catch (javax.xml.xpath.XPathException e) |
| { |
| throw new XPathException(XPathException.TYPE_ERR, e.getMessage()); |
| } |
| } |
| |
| public String toString () |
| { |
| return getClass ().getName () + "[expression=" + expression + "]"; |
| } |
| |
| } |