/*--
$Id: JDOMSource.java,v 1.18 2004/08/31 04:43:48 jhunter Exp $
Copyright (C) 2001-2004 Jason Hunter & Brett McLaughlin.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions, and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions, and the disclaimer that follows
these conditions in the documentation and/or other materials
provided with the distribution.
3. The name "JDOM" must not be used to endorse or promote products
derived from this software without prior written permission. For
written permission, please contact <request_AT_jdom_DOT_org>.
4. Products derived from this software may not be called "JDOM", nor
may "JDOM" appear in their name, without prior written permission
from the JDOM Project Management <request_AT_jdom_DOT_org>.
In addition, we request (but do not require) that you include in the
end-user documentation provided with the redistribution and/or in the
software itself an acknowledgement equivalent to the following:
"This product includes software developed by the
JDOM Project (http://www.jdom.org/)."
Alternatively, the acknowledgment may be graphical using the logos
available at http://www.jdom.org/images/logos.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE JDOM AUTHORS OR THE PROJECT
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
This software consists of voluntary contributions made by many
individuals on behalf of the JDOM Project and was originally
created by Jason Hunter <jhunter_AT_jdom_DOT_org> and
Brett McLaughlin <brett_AT_jdom_DOT_org>. For more information
on the JDOM Project, please see <http://www.jdom.org/>.
*/
package org.jdom.transform;
import java.io.*;
import java.util.*;
import javax.xml.transform.sax.*;
import org.jdom.*;
import org.jdom.output.*;
import org.xml.sax.*;
/**
* A holder for an XML Transformation source: a Document, Element, or list of
* nodes.
* <p>
* The is provides input to a
* {@link javax.xml.transform.Transformer JAXP TrAX Transformer}.
* <p>
* The following example shows how to apply an XSL Transformation
* to a JDOM document and get the transformation result in the form
* of a list of JDOM nodes:
* <pre><code>
* public static List transform(Document doc, String stylesheet)
* throws JDOMException {
* try {
* Transformer transformer = TransformerFactory.newInstance()
* .newTransformer(new StreamSource(stylesheet));
* JDOMSource in = new JDOMSource(doc);
* JDOMResult out = new JDOMResult();
* transformer.transform(in, out);
* return out.getResult();
* }
* catch (TransformerException e) {
* throw new JDOMException("XSLT Transformation failed", e);
* }
* }
* </code></pre>
*
* @see org.jdom.transform.JDOMResult
*
* @version $Revision: 1.18 $, $Date: 2004/08/31 04:43:48 $
* @author Laurent Bihanic
* @author Jason Hunter
*/
public class JDOMSource extends SAXSource {
private static final String CVS_ID =
"@(#) $RCSfile: JDOMSource.java,v $ $Revision: 1.18 $ $Date: 2004/08/31 04:43:48 $ $Name: jdom_1_0 $";
/**
* If {@link javax.xml.transform.TransformerFactory#getFeature}
* returns <code>true</code> when passed this value as an
* argument, the Transformer natively supports JDOM.
* <p>
* <strong>Note</strong>: This implementation does not override
* the {@link SAXSource#FEATURE} value defined by its superclass
* to be considered as a SAXSource by Transformer implementations
* not natively supporting JDOM.
* </p>
*/
public final static String JDOM_FEATURE =
"http://org.jdom.transform.JDOMSource/feature";
/**
* The XMLReader object associated to this source or
* <code>null</code> if no XMLReader has yet been requested.
*
* @see #getXMLReader
*/
private XMLReader xmlReader = null;
/**
* Creates a JDOM TrAX source wrapping a JDOM document.
*
* @param source the JDOM document to use as source for the
* transformations
*
* @throws IllegalArgumentException if <code>source</code> is
* <code>null</code>.
*/
public JDOMSource(Document source) {
setDocument(source);
}
/**
* Creates a JDOM TrAX source wrapping a list of JDOM nodes.
*
* @param source the JDOM nodes to use as source for the
* transformations
*
* @throws IllegalArgumentException if <code>source</code> is
* <code>null</code>.
*/
public JDOMSource(List source) {
setNodes(source);
}
/**
* Creates a JDOM TrAX source wrapping a JDOM element.
*
* @param source the JDOM element to use as source for the
* transformations
*
* @throws IllegalArgumentException if <code>source</code> is
* <code>null</code>.
*/
public JDOMSource(Element source) {
List nodes = new ArrayList();
nodes.add(source);
setNodes(nodes);
}
/**
* Sets the source document used by this TrAX source.
*
* @param source the JDOM document to use as source for the
* transformations
*
* @throws IllegalArgumentException if <code>source</code> is
* <code>null</code>.
*
* @see #getDocument
*/
public void setDocument(Document source) {
super.setInputSource(new JDOMInputSource(source));
}
/**
* Returns the source document used by this TrAX source.
*
* @return the source document used by this TrAX source or
* <code>null</code> if the source is a node list.
*
* @see #setDocument
*/
public Document getDocument() {
Object src = ((JDOMInputSource)getInputSource()).getSource();
Document doc = null;
if (src instanceof Document) {
doc = (Document)src;
}
return doc;
}
/**
* Sets the source node list used by this TrAX source.
*
* @param source the JDOM nodes to use as source for the
* transformations
*
* @throws IllegalArgumentException if <code>source</code> is
* <code>null</code>.
*
* @see #getNodes
*/
public void setNodes(List source) {
super.setInputSource(new JDOMInputSource(source));
}
/**
* Returns the source node list used by this TrAX source.
*
* @return the source node list used by this TrAX source or
* <code>null</code> if the source is a JDOM document.
*
* @see #setDocument
*/
public List getNodes() {
Object src = ((JDOMInputSource)getInputSource()).getSource();
List nodes = null;
if (src instanceof List) {
nodes = (List)src;
}
return nodes;
}
//-------------------------------------------------------------------------
// SAXSource overwritten methods
//-------------------------------------------------------------------------
/**
* Sets the SAX InputSource to be used for the Source.
* <p>
* As this implementation only supports JDOM document as data
* source, this method always throws an
* {@link UnsupportedOperationException}.
* </p>
*
* @param inputSource a valid InputSource reference.
*
* @throws UnsupportedOperationException always!
*/
public void setInputSource(InputSource inputSource)
throws UnsupportedOperationException {
throw new UnsupportedOperationException();
}
/**
* Set the XMLReader to be used for the Source.
* <p>
* As this implementation only supports JDOM document as data
* source, this method throws an
* {@link UnsupportedOperationException} if the provided reader
* object does not implement the SAX {@link XMLFilter}
* interface. Otherwise, the JDOM document reader will be
* attached as parent of the filter chain.</p>
*
* @param reader a valid XMLReader or XMLFilter reference.
*
* @throws UnsupportedOperationException if <code>reader</code>
* is not a SAX
* {@link XMLFilter}.
* @see #getXMLReader
*/
public void setXMLReader(XMLReader reader)
throws UnsupportedOperationException {
if (reader instanceof XMLFilter) {
// Connect the filter chain to a document reader.
XMLFilter filter = (XMLFilter)reader;
while (filter.getParent() instanceof XMLFilter) {
filter = (XMLFilter)(filter.getParent());
}
filter.setParent(new DocumentReader());
// Read XML data from filter chain.
this.xmlReader = reader;
}
else {
throw new UnsupportedOperationException();
}
}
/**
* Returns the XMLReader to be used for the Source.
* <p>
* This implementation returns a specific XMLReader reading
* the XML data from the source JDOM document.
* </p>
*
* @return an XMLReader reading the XML data from the source
* JDOM document.
*/
public XMLReader getXMLReader() {
if (this.xmlReader == null) {
this.xmlReader = new DocumentReader();
}
return this.xmlReader;
}
//=========================================================================
// JDOMInputSource nested class
//=========================================================================
/**
* A subclass of the SAX InputSource interface that wraps a JDOM
* Document.
* <p>
* This class is nested in JDOMSource as it is not intented to
* be used independently of its friend: DocumentReader.
* </p>
*
* @see org.jdom.Document
*/
private static class JDOMInputSource extends InputSource {
/**
* The source as a JDOM document or a list of JDOM nodes.
*/
private Object source = null;
/**
* Builds a InputSource wrapping the specified JDOM Document.
*
* @param document the source document.
*/
public JDOMInputSource(Document document) {
this.source = document;
}
/**
* Builds a InputSource wrapping a list of JDOM nodes.
*
* @param nodes the source JDOM nodes.
*/
public JDOMInputSource(List nodes) {
this.source = nodes;
}
/**
* Returns the source.
*
* @return the source as a JDOM document or a list of JDOM nodes.
*/
public Object getSource() {
return source;
}
//-------------------------------------------------------------------------
// InputSource overwritten methods
//-------------------------------------------------------------------------
/**
* Sets the character stream for this input source.
* <p>
* This implementation always throws an
* {@link UnsupportedOperationException} as the only source
* stream supported is the source JDOM document.
* </p>
*
* @param characterStream a character stream containing
* an XML document.
*
* @throws UnsupportedOperationException always!
*/
public void setCharacterStream(Reader characterStream)
throws UnsupportedOperationException {
throw new UnsupportedOperationException();
}
/**
* Gets the character stream for this input source.
* <p>
* Note that this method is only provided to make this
* InputSource implementation acceptable by any XML
* parser. As it generates an in-memory string representation
* of the JDOM document, it is quite inefficient from both
* speed and memory consumption points of view.
* </p>
*
* @return a Reader to a string representation of the
* source JDOM document.
*/
public Reader getCharacterStream() {
Object src = this.getSource();
Reader reader = null;
if (src instanceof Document) {
// Get an in-memory string representation of the document
// and return a reader on it.
reader = new StringReader(
new XMLOutputter().outputString((Document)src));
}
else {
if (src instanceof List) {
reader = new StringReader(
new XMLOutputter().outputString((List)src));
}
// Else: No source, no reader!
}
return reader;
}
}
//=========================================================================
// DocumentReader nested class
//=========================================================================
/**
* An implementation of the SAX2 XMLReader interface that presents
* a SAX view of a JDOM Document. The actual generation of the
* SAX events is delegated to JDOM's SAXOutputter.
*
* @see org.jdom.Document
* @see org.jdom.output.SAXOutputter
*/
private static class DocumentReader extends SAXOutputter
implements XMLReader {
/**
* Public default constructor.
*/
public DocumentReader() {
super();
}
//----------------------------------------------------------------------
// SAX XMLReader interface support
//----------------------------------------------------------------------
/**
* Parses an XML document from a system identifier (URI).
* <p>
* This implementation does not support reading XML data from
* system identifiers, only from JDOM documents. Hence,
* this method always throws a {@link SAXNotSupportedException}.
* </p>
*
* @param systemId the system identifier (URI).
*
* @throws SAXNotSupportedException always!
*/
public void parse(String systemId) throws SAXNotSupportedException {
throw new SAXNotSupportedException(
"Only JDOM Documents are supported as input");
}
/**
* Parses an XML document.
* <p>
* The methods accepts only <code>JDOMInputSource</code>s
* instances as input sources.
* </p>
*
* @param input the input source for the top-level of the
* XML document.
*
* @throws SAXException any SAX exception,
* possibly wrapping
* another exception.
* @throws SAXNotSupportedException if the input source does
* not wrap a JDOM document.
*/
public void parse(InputSource input) throws SAXException {
if (input instanceof JDOMInputSource) {
try {
Object source = ((JDOMInputSource)input).getSource();
if (source instanceof Document) {
this.output((Document)source);
}
else {
this.output((List)source);
}
}
catch (JDOMException e) {
throw new SAXException(e.getMessage(), e);
}
}
else {
throw new SAXNotSupportedException(
"Only JDOM Documents are supported as input");
}
}
}
}