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Diffstat (limited to 'libjava/classpath/gnu/xml/dom/DomXPathExpression.java')
| -rw-r--r-- | libjava/classpath/gnu/xml/dom/DomXPathExpression.java | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/xml/dom/DomXPathExpression.java b/libjava/classpath/gnu/xml/dom/DomXPathExpression.java new file mode 100644 index 000000000..0b6962930 --- /dev/null +++ b/libjava/classpath/gnu/xml/dom/DomXPathExpression.java @@ -0,0 +1,147 @@ +/* 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., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 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 + "]"; + } + +} |