Hello fadi,
Tuesday, April 5, 2005, 5:01:15 PM, you wrote:
fq> The second match pattern builds a session context and loads
fq> its data from the first match pattern. How can I tell cocoon to
fq> automatically execute the second match pattern (i.e. without
fq> explicitly requesting it via the Internet explorer). is it
fq> possible to do this ?
Maybe flowscript would be better approach ... but I've written simple action
which can call another pipeline and eventually creates sitemap
parameter with returned XML as DOM tree:
import org.apache.avalon.excalibur.component.ComponentHandler;
import org.apache.avalon.framework.activity.Disposable;
import org.apache.avalon.framework.configuration.Configuration;
import org.apache.avalon.framework.configuration.ConfigurationException;
import org.apache.avalon.framework.parameters.Parameters;
import org.apache.avalon.framework.thread.ThreadSafe;
import org.apache.cocoon.acting.ConfigurableComposerAction;
import org.apache.cocoon.components.sax.XMLByteStreamCompiler;
import org.apache.cocoon.components.sax.XMLByteStreamFragment;
import org.apache.cocoon.environment.ObjectModelHelper;
import org.apache.cocoon.environment.Redirector;
import org.apache.cocoon.environment.Request;
import org.apache.cocoon.environment.SourceResolver;
import org.apache.cocoon.generation.FileGenerator;
import org.apache.cocoon.xml.AbstractXMLConsumer;
import org.w3c.dom.Document;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
public class CallPipelineAction extends ConfigurableComposerAction implements
Disposable, ThreadSafe {
ComponentHandler generatorHandler;
public void configure(Configuration conf) throws ConfigurationException {
try {
this.generatorHandler = ComponentHandler.getComponentHandler(
FileGenerator.class, conf, this.manager, null,
null,
null,
null,
"N/A"
);
this.generatorHandler.enableLogging(getLogger());
this.generatorHandler.initialize();
} catch (Exception e) {
throw new ConfigurationException("Cannot set up component handler", e);
}
}
public void dispose() {
if (this.generatorHandler != null) {
this.generatorHandler.dispose();
this.generatorHandler = null;
}
}
public Map act(Redirector redirector, SourceResolver resolver,
Map objectModel, String source, Parameters parameters) throws Exception {
String pipeline = parameters.getParameter("pipeline");
String discard = parameters.getParameter("discard", "false");
String outputParamName = parameters.getParameter("output", "output");
FileGenerator generator = (FileGenerator) this.generatorHandler.get();
XMLByteStreamCompiler compiler = null;
Map map = new HashMap();
try {
Parameters genParams = new Parameters();
generator.enableLogging(getLogger());
generator.setup(resolver, objectModel, pipeline, genParams);
if (discard.equals("true")) {
generator.setConsumer(new AbstractXMLConsumer() {
});
generator.generate();
} else {
compiler = new XMLByteStreamCompiler();
generator.setConsumer(compiler);
generator.generate();
XMLByteStreamFragment fragment = new XMLByteStreamFragment(compiler
.getSAXFragment());
DocumentBuilder builder = DocumentBuilderFactory.newInstance()
.newDocumentBuilder();
Document doc = builder.newDocument();
fragment.toDOM(doc);
Request request = ObjectModelHelper.getRequest(objectModel);
request.setAttribute(outputParamName, doc);
}
} catch (Exception e) {
if (getLogger().isErrorEnabled())
getLogger().error("Error while calling another pipeline " + e);
map = null;
} finally {
generatorHandler.put(generator);
}
return map;
}
}
Sample usage:
<map:act type="call-pipeline">
<map:parameter name="pipeline"
value="cocoon:/some-pipe-2-execute"/>
<map:parameter name="discard" value="true"/>
</map:act>
--
Best regards,
Grzegorz Sikora
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