Source Code Cross Referenced for XMLDocumentContainer.java in  » Library » Apache-commons-jxpath-1.2-src » org » apache » commons » jxpath » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Apache commons jxpath 1.2 src » org.apache.commons.jxpath 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * Copyright 1999-2004 The Apache Software Foundation
03:         *
04:         * Licensed under the Apache License, Version 2.0 (the "License");
05:         * you may not use this file except in compliance with the License.
06:         * You may obtain a copy of the License at
07:         *
08:         *     http://www.apache.org/licenses/LICENSE-2.0
09:         *
10:         * Unless required by applicable law or agreed to in writing, software
11:         * distributed under the License is distributed on an "AS IS" BASIS,
12:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13:         * See the License for the specific language governing permissions and
14:         * limitations under the License.
15:         */
16:        package org.apache.commons.jxpath;
17:
18:        import java.net.URL;
19:
20:        import javax.xml.transform.Source;
21:        import javax.xml.transform.Transformer;
22:        import javax.xml.transform.TransformerFactory;
23:        import javax.xml.transform.dom.DOMResult;
24:
25:        import org.apache.commons.jxpath.xml.DocumentContainer;
26:        import org.w3c.dom.Document;
27:
28:        /**
29:         * An XML document container reads and parses XML only when it is
30:         * accessed.  JXPath traverses Containers transparently -
31:         * you use the same paths to access objects in containers as you
32:         * do to access those objects directly.  You can create
33:         * XMLDocumentContainers for various XML documents that may or
34:         * may not be accessed by XPaths.  If they are, they will be automatically
35:         * read, parsed and traversed. If they are not - they won't be
36:         * read at all.
37:         *
38:         * @deprecated 1.1 Please use org.apache.commons.jxpath.xml.DocumentContainer
39:         *
40:         * @author Dmitri Plotnikov
41:         * @version $Revision: 1.11 $ $Date: 2004/02/29 14:17:42 $
42:         */
43:        public class XMLDocumentContainer implements  Container {
44:
45:            private DocumentContainer delegate;
46:            private Object document;
47:            private URL xmlURL;
48:            private Source source;
49:            private String parser;
50:
51:            /**
52:             * @param  URL is a URL for an XML file. Use getClass().getResource
53:             * (resourceName) to load XML from a resource file.
54:             */
55:            public XMLDocumentContainer(URL xmlURL) {
56:                delegate = new DocumentContainer(xmlURL);
57:            }
58:
59:            public XMLDocumentContainer(Source source) {
60:                this .source = source;
61:                if (source == null) {
62:                    throw new RuntimeException("Source is null");
63:                }
64:            }
65:
66:            /**
67:             * Reads XML, caches it internally and returns the Document.
68:             */
69:            public Object getValue() {
70:                if (document == null) {
71:                    try {
72:                        if (source != null) {
73:                            DOMResult result = new DOMResult();
74:                            Transformer trans = TransformerFactory
75:                                    .newInstance().newTransformer();
76:                            trans.transform(source, result);
77:                            document = (Document) result.getNode();
78:                        } else {
79:                            document = delegate.getValue();
80:                        }
81:                    } catch (Exception ex) {
82:                        throw new JXPathException("Cannot read XML from: "
83:                                + (xmlURL != null ? xmlURL.toString()
84:                                        : (source != null ? source
85:                                                .getSystemId()
86:                                                : "<<undefined source>>")), ex);
87:                    }
88:                }
89:                return document;
90:            }
91:
92:            /**
93:             * Throws an UnsupportedOperationException
94:             */
95:            public void setValue(Object value) {
96:                throw new UnsupportedOperationException();
97:            }
98:        }
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