/*
$Id: LanguageExistsAction.java,v 1.2 2003/09/03 12:07:03 egli Exp $
<License>
============================================================================
The Apache Software License, Version 1.1
============================================================================
Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
Redistribution and use in source and binary forms, with or without modifica-
tion, 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 following disclaimer in the documentation
and/or other materials provided with the distribution.
3. The end-user documentation included with the redistribution, if any, must
include the following acknowledgment: "This product includes software
developed by the Apache Software Foundation (http://www.apache.org/)."
Alternately, this acknowledgment may appear in the software itself, if
and wherever such third-party acknowledgments normally appear.
4. The names "Apache Lenya" and "Apache Software Foundation" must not be
used to endorse or promote products derived from this software without
prior written permission. For written permission, please contact
apache@apache.org.
5. Products derived from this software may not be called "Apache", nor may
"Apache" appear in their name, without prior written permission of the
Apache Software Foundation.
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
APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
DING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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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 Apache Software Foundation and was originally created by
Michael Wechner <michi@apache.org>. For more information on the Apache Soft-
ware Foundation, please see <http://www.apache.org/>.
Lenya includes software developed by the Apache Software Foundation, W3C,
DOM4J Project, BitfluxEditor, Xopus, and WebSHPINX.
</License>
*/
package org.apache.lenya.cms.cocoon.acting;
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;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Map;
/**
* 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.
*
* @author <a href="mailto:egli@apache.org">Christian Egli</a>
*/
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;
}
}