vgritsenko 2002/10/22 21:17:56
Modified: src/java/org/apache/cocoon/transformation
ReadDOMSessionTransformer.java
Log:
Rework transformer to use xsp:expr.
So now it's not about only DOM anymore...
Revision Changes Path
1.9 +77 -79
xml-cocoon2/src/java/org/apache/cocoon/transformation/ReadDOMSessionTransformer.java
Index: ReadDOMSessionTransformer.java
===================================================================
RCS file:
/home/cvs/xml-cocoon2/src/java/org/apache/cocoon/transformation/ReadDOMSessionTransformer.java,v
retrieving revision 1.8
retrieving revision 1.9
diff -u -r1.8 -r1.9
--- ReadDOMSessionTransformer.java 10 Sep 2002 12:15:49 -0000 1.8
+++ ReadDOMSessionTransformer.java 23 Oct 2002 04:17:56 -0000 1.9
@@ -51,15 +51,12 @@
package org.apache.cocoon.transformation;
import org.apache.avalon.framework.parameters.Parameters;
-import org.apache.cocoon.Constants;
import org.apache.cocoon.ProcessingException;
import org.apache.cocoon.environment.ObjectModelHelper;
import org.apache.cocoon.environment.Request;
import org.apache.cocoon.environment.Session;
import org.apache.cocoon.environment.SourceResolver;
-import org.apache.cocoon.xml.EmbeddedXMLPipe;
-import org.apache.cocoon.xml.dom.DOMStreamer;
-import org.w3c.dom.Node;
+import org.apache.cocoon.xml.XMLUtils;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
@@ -68,120 +65,121 @@
/**
- * With this transformer, a DOM-object that is stored in the session, can be
inserted
- * in the SAX stream at a given position.
+ * With this transformer, an object that is stored in the session, can be inserted
+ * in the SAX stream at a given position, using usual <xsp:expr> rules.
+ * Object can be DOM Node, XMLizable, or any other object supported by
<xsp:expr>.
*
* Usage in sitemap:
- * <map:transform type="readDOMsession">
- * <map:parameter name="dom-name" value="companyInfo"/>
+ * <pre>
+ * <map:transform type="read-session">
+ * <map:parameter name="attribute-name" value="companyInfo"/>
* <map:parameter name="trigger-element" value="company"/>
* <map:parameter name="position" value="after"/>
* </map:transform>
+ * </pre>
*
- * where:
- * dom-name is the name of the DOM object in the session
- * trigger-element is the element that we need to insert the SAX events
- * postion is the actual place where the stream will be inserted, ie before, after
or in
+ * Where:
+ * <ul>
+ * <li><b>attribute-name</b> is the name of the object in the session
+ * <li><b>trigger-element</b> is the element that we need to insert the SAX events
+ * <li><b>postion</b> is the actual place where the stream will be inserted, ie
before, after or in
* the trigger-element
+ * </ul>
*
* @author <a href="mailto:sven.beauprez@;the-ecorp.com">Sven Beauprez</a>
+ * @author <a href="mailto:vgritsenko@;apache.org">Vadim Gritsenko</a>
* @version CVS $Id$
*/
-
public class ReadDOMSessionTransformer extends AbstractTransformer {
- public static final String DOM_NAME = "dom-name";
+ public static final String ATTRIBUTE_NAME = "attribute-name";
public static final String TRIGGER_ELEMENT = "trigger-element";
+
/*
position where the sax events from the dom should be insterted
this can be: 'before', 'after' or 'in'
*/
public static final String POSITION = "position";
- Node node;
- DOMStreamer streamer;
Session session;
-
- String DOMName;
+ String attributeName;
String trigger;
String position;
/** BEGIN SitemapComponent methods **/
- public void setup(SourceResolver resolver, Map objectModel,
- String source, Parameters parameters)
- throws ProcessingException, SAXException, IOException {
- Request request = ObjectModelHelper.getRequest(objectModel);
- session = request.getSession(false);
- if (session != null) {
- DOMName = parameters.getParameter(ReadDOMSessionTransformer.DOM_NAME,null);
- trigger =
parameters.getParameter(ReadDOMSessionTransformer.TRIGGER_ELEMENT,null);
- position = parameters.getParameter(ReadDOMSessionTransformer.POSITION,"in");
- if (this.getLogger().isDebugEnabled()) {
- getLogger().debug("ReadSessionTransformer: SessioID="+session.getId());
- getLogger().debug("ReadSessionTransformer: Session available, try to
read from it");
- getLogger().debug("ReadSessionTransformer: " +
ReadDOMSessionTransformer.DOM_NAME + "="+
- DOMName + " " + ReadDOMSessionTransformer.TRIGGER_ELEMENT
+ "=" +
- trigger + " " + ReadDOMSessionTransformer.POSITION + "=" +
- position);
+ public void setup(SourceResolver resolver,
+ Map objectModel,
+ String source,
+ Parameters parameters)
+ throws ProcessingException, SAXException, IOException {
+ Request request = ObjectModelHelper.getRequest(objectModel);
+ session = request.getSession(false);
+ if (session != null) {
+ if (getLogger().isDebugEnabled()) {
+ getLogger().debug("Session is available. ID=" + session.getId());
+ }
+ this.attributeName = parameters.getParameter(ATTRIBUTE_NAME, null);
+ if (this.attributeName == null) {
+ // Try old syntax
+ this.attributeName = parameters.getParameter("dom-name", null);
+ }
+
+ this.trigger = parameters.getParameter(TRIGGER_ELEMENT, null);
+ this.position = parameters.getParameter(POSITION, "in");
+ if (getLogger().isDebugEnabled()) {
+ getLogger().debug(ATTRIBUTE_NAME + "=" + attributeName + ", "
+ + TRIGGER_ELEMENT + "=" + trigger + ", "
+ + POSITION + "=" + position);
+ }
+ } else {
+ getLogger().warn("No session object: Nothing to do.");
}
- } else {
- getLogger().error("ReadSessionTransformer: no session object");
- }
}
/** END SitemapComponent methods **/
/** BEGIN SAX ContentHandler handlers **/
public void startElement(String uri, String name, String raw, Attributes
attributes)
- throws SAXException {
- //start streaming after certain startelement is encountered
- if (name.equalsIgnoreCase(trigger)) {
- if (this.getLogger().isDebugEnabled()) {
- getLogger().debug("ReadSessionTransformer: trigger encountered");
+ throws SAXException {
+ // Start streaming after certain startelement is encountered
+ if (name.equalsIgnoreCase(trigger)) {
+ getLogger().debug("Trigger encountered");
+ if ("before".equalsIgnoreCase(position)) {
+ stream();
+ super.contentHandler.startElement(uri,name,raw,attributes);
+ } else if ("in".equalsIgnoreCase(position)) {
+ super.contentHandler.startElement(uri,name,raw,attributes);
+ stream();
+ } else if ("after".equalsIgnoreCase(position)) {
+ super.contentHandler.startElement(uri,name,raw,attributes);
+ }
+ } else {
+ super.contentHandler.startElement(uri,name,raw,attributes);
}
- if (position.equalsIgnoreCase("before")) {
- streamDOM();
- super.contentHandler.startElement(uri,name,raw,attributes);
- } else if (position.equalsIgnoreCase("in")) {
- super.contentHandler.startElement(uri,name,raw,attributes);
- streamDOM();
- } else if (position.equalsIgnoreCase("after")) {
- super.contentHandler.startElement(uri,name,raw,attributes);
- }
- } else {
- super.contentHandler.startElement(uri,name,raw,attributes);
- }
}
public void endElement(String uri,String name,String raw)
- throws SAXException {
- super.contentHandler.endElement(uri,name,raw);
- if (name.equalsIgnoreCase(trigger)) {
- if (position.equalsIgnoreCase("after")) {
- streamDOM();
+ throws SAXException {
+ super.contentHandler.endElement(uri,name,raw);
+ if (name.equalsIgnoreCase(trigger)) {
+ if ("after".equalsIgnoreCase(position)) {
+ stream();
+ }
}
- }
}
/** END SAX ContentHandler handlers **/
/** own methods **/
- private void streamDOM()
- throws SAXException {
- if (DOMName!=null) {
- node = (Node)session.getAttribute(DOMName);
- } else {
- getLogger().error("ReadSessionTransformer: no "+
ReadDOMSessionTransformer.DOM_NAME
- +" parameter specified");
- }
- if (node!=null) {
- if (this.getLogger().isDebugEnabled()) {
- getLogger().debug("ReadSessionTransformer: start streaming");
+ private void stream() throws SAXException {
+ if (attributeName != null) {
+ Object node = session.getAttribute(attributeName);
+ if (node != null) {
+ getLogger().debug("Start streaming");
+ XMLUtils.valueOf(super.xmlConsumer, node);
+ } else {
+ getLogger().error("No attribute " + attributeName + " in session");
+ }
+ } else {
+ getLogger().error("No "+ ATTRIBUTE_NAME + " parameter specified");
}
- EmbeddedXMLPipe pipe = new EmbeddedXMLPipe(super.contentHandler);
- streamer = new DOMStreamer(pipe,super.lexicalHandler);
- streamer.stream(node);
- }else {
- getLogger().error("ReadSessionTransformer: no Document in session");
- }
}
-
}
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