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The source code/* * Copyright 1999-2004 The Apache Software Foundation * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.commons.jxpath; import java.net.URL; import javax.xml.transform.Source; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerFactory; import javax.xml.transform.dom.DOMResult; import org.apache.commons.jxpath.xml.DocumentContainer; import org.w3c.dom.Document; /** * An XML document container reads and parses XML only when it is * accessed. JXPath traverses Containers transparently - * you use the same paths to access objects in containers as you * do to access those objects directly. You can create * XMLDocumentContainers for various XML documents that may or * may not be accessed by XPaths. If they are, they will be automatically * read, parsed and traversed. If they are not - they won't be * read at all. * * @deprecated 1.1 Please use org.apache.commons.jxpath.xml.DocumentContainer * * @author Dmitri Plotnikov * @version $Revision: 1.11 $ $Date: 2004/02/29 14:17:42 $ */ public class XMLDocumentContainer implements Container { private DocumentContainer delegate; private Object document; private URL xmlURL; private Source source; private String parser; /** * @param URL is a URL for an XML file. Use getClass().getResource * (resourceName) to load XML from a resource file. */ public XMLDocumentContainer(URL xmlURL) { delegate = new DocumentContainer(xmlURL); } public XMLDocumentContainer(Source source) { this.source = source; if (source == null) { throw new RuntimeException("Source is null"); } } /** * Reads XML, caches it internally and returns the Document. */ public Object getValue() { if (document == null) { try { if (source != null) { DOMResult result = new DOMResult(); Transformer trans = TransformerFactory.newInstance().newTransformer(); trans.transform(source, result); document = (Document) result.getNode(); } else { document = delegate.getValue(); } } catch (Exception ex) { throw new JXPathException( "Cannot read XML from: " + (xmlURL != null ? xmlURL.toString() : (source != null ? source.getSystemId() : "< |
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