/*
* 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.
*
*/
/* $Id: LanguageExistsAction.java,v 1.4 2004/03/01 16:18:21 gregor Exp $ */
package org.apache.lenya.cms.cocoon.acting;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import org.apache.avalon.framework.parameters.Parameters;
import org.apache.cocoon.acting.AbstractAction;
import org.apache.cocoon.environment.Redirector;
import org.apache.cocoon.environment.SourceResolver;
import org.apache.lenya.cms.publication.Document;
import org.apache.lenya.cms.publication.DocumentDoesNotExistException;
import org.apache.lenya.cms.publication.DocumentException;
import org.apache.lenya.cms.publication.PageEnvelope;
import org.apache.lenya.cms.publication.PageEnvelopeException;
import org.apache.lenya.cms.publication.PageEnvelopeFactory;
/**
* Action that checks the sitetree if there is a node with the
* current document-id and the current language, i.e. if the
* current document has a version in the current language.
*/
public class LanguageExistsAction extends AbstractAction {
/**
* Check if the current document-id has a document for the
* currently requested language.
*
* If yes return an empty map, if not return null.
*
* @param redirector a <code>Redirector</code> value
* @param resolver a <code>SourceResolver</code> value
* @param objectModel a <code>Map</code> value
* @param source a <code>String</code> value
* @param parameters a <code>Parameters</code> value
*
* @return an empty <code>Map</code> if there is a version of this
* document for the current language, null otherwiese
*
* @exception DocumentDoesNotExistException if there is no document with the specified document-id.
* @exception PageEnvelopeException if the PageEnvelope could not be created.
* @exception DocumentException if the language information could not be fetched from the document.
*/
public Map act(
Redirector redirector,
SourceResolver resolver,
Map objectModel,
String source,
Parameters parameters)
throws PageEnvelopeException, DocumentDoesNotExistException, DocumentException {
PageEnvelope pageEnvelope =
PageEnvelopeFactory.getInstance().getPageEnvelope(objectModel);
Document doc = pageEnvelope.getDocument();
String language = doc.getLanguage();
if (!doc.existsInAnyLanguage()) {
throw new DocumentDoesNotExistException("Document " + doc.getId() + " does not exist");
}
List availableLanguages = Arrays.asList(doc.getLanguages());
if (availableLanguages.contains(language)) {
return Collections.unmodifiableMap(Collections.EMPTY_MAP);
}
return null;
}
}