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WebDAV server implementations for JCR
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
package org.apache.jackrabbit.webdav.simple;
import org.apache.jackrabbit.webdav.DavException;
import org.apache.jackrabbit.webdav.DavMethods;
import org.apache.jackrabbit.webdav.DavResource;
import org.apache.jackrabbit.webdav.DavResourceFactory;
import org.apache.jackrabbit.webdav.DavResourceLocator;
import org.apache.jackrabbit.webdav.DavServletRequest;
import org.apache.jackrabbit.webdav.DavServletResponse;
import org.apache.jackrabbit.webdav.DavSession;
import org.apache.jackrabbit.webdav.jcr.JcrDavSession;
import org.apache.jackrabbit.webdav.lock.LockManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.jcr.Item;
import javax.jcr.Node;
import javax.jcr.PathNotFoundException;
import javax.jcr.RepositoryException;
import javax.jcr.Repository;
import javax.jcr.Session;
import javax.jcr.version.Version;
import javax.jcr.version.VersionHistory;
/**
* ResourceFactoryImpl implements a simple DavResourceFactory
*/
public class ResourceFactoryImpl implements DavResourceFactory {
private static Logger log =LoggerFactory.getLogger(ResourceFactoryImpl.class);
private final LockManager lockMgr;
private final ResourceConfig resourceConfig;
/**
* Create a new ResourceFactory that uses the given lock
* manager and resource filter.
*
* @param lockMgr
* @param resourceConfig
*/
public ResourceFactoryImpl(LockManager lockMgr, ResourceConfig resourceConfig) {
this.lockMgr = lockMgr;
this.resourceConfig = resourceConfig;
}
/**
* Create a new DavResource from the given locator and
* request.
*
* @param locator
* @param request
* @param response
* @return DavResource
* @throws DavException
* @see DavResourceFactory#createResource(DavResourceLocator,
* DavServletRequest, DavServletResponse)
*/
public DavResource createResource(DavResourceLocator locator, DavServletRequest request,
DavServletResponse response) throws DavException {
try {
Node node = getNode(request.getDavSession(), locator);
DavResource resource;
if (node == null) {
log.debug("Creating resource for non-existing repository node.");
boolean isCollection = DavMethods.isCreateCollectionRequest(request);
resource = createNullResource(locator, request.getDavSession(), isCollection);
} else {
resource = createResource(node, locator, request.getDavSession());
}
resource.addLockManager(lockMgr);
return resource;
} catch (RepositoryException e) {
throw new DavException(DavServletResponse.SC_INTERNAL_SERVER_ERROR, e);
}
}
/**
* Create a new DavResource from the given locator and webdav
* session.
*
* @param locator
* @param session
* @return
* @throws DavException
* @see DavResourceFactory#createResource(DavResourceLocator, DavSession)
*/
public DavResource createResource(DavResourceLocator locator, DavSession session) throws DavException {
try {
Node node = getNode(session, locator);
DavResource resource = createResource(node, locator, session);
resource.addLockManager(lockMgr);
return resource;
} catch (RepositoryException e) {
throw new DavException(DavServletResponse.SC_INTERNAL_SERVER_ERROR, e);
}
}
/**
* Returns the Node corresponding to the given locator or
* null if it does not exist or if the existing item represents
* a Property.
*
* @param sessionImpl
* @param locator
* @return
* @throws RepositoryException
*/
private Node getNode(DavSession sessionImpl, DavResourceLocator locator)
throws RepositoryException {
Node node = null;
try {
String repoPath = locator.getRepositoryPath();
if (repoPath != null) {
Session session = ((JcrDavSession)sessionImpl).getRepositorySession();
Item item = session.getItem(repoPath);
if (item instanceof Node) {
node = (Node)item;
} // else: item is a property -> return null
}
} catch (PathNotFoundException e) {
// item does not exist (yet). return null -> create null-resource
}
return node;
}
/**
* Create a 'null resource'
*
* @param locator
* @param session
* @param isCollection
* @return
* @throws DavException
*/
private DavResource createNullResource(DavResourceLocator locator,
DavSession session,
boolean isCollection) throws DavException {
JcrDavSession.checkImplementation(session);
JcrDavSession sessionImpl = (JcrDavSession)session;
DavResource resource;
if (versioningSupported(sessionImpl.getRepositorySession())) {
resource = new VersionControlledResourceImpl(locator, this, sessionImpl, resourceConfig, isCollection);
} else {
resource = new DavResourceImpl(locator, this, sessionImpl, resourceConfig, isCollection);
}
return resource;
}
/**
* Tries to retrieve the repository item defined by the locator's resource
* path and build the corresponding WebDAV resource. If the repository
* supports the versioning option different resources are created for
* version, versionhistory and common nodes.
*
* @param node
* @param locator
* @param session
* @return
* @throws DavException
*/
private DavResource createResource(Node node, DavResourceLocator locator,
DavSession session) throws DavException {
JcrDavSession.checkImplementation(session);
JcrDavSession sessionImpl = (JcrDavSession)session;
DavResource resource;
if (versioningSupported(sessionImpl.getRepositorySession())) {
// create special resources for Version and VersionHistory
if (node instanceof Version) {
resource = new VersionResourceImpl(locator, this, sessionImpl, resourceConfig, node);
} else if (node instanceof VersionHistory) {
resource = new VersionHistoryResourceImpl(locator, this, sessionImpl, resourceConfig, node);
} else {
resource = new VersionControlledResourceImpl(locator, this, sessionImpl, resourceConfig, node);
}
} else {
resource = new DavResourceImpl(locator, this, session, resourceConfig, node);
}
return resource;
}
/**
* @param repoSession
* @return true if the JCR repository supports versioning.
*/
private static boolean versioningSupported(Session repoSession) {
String desc = repoSession.getRepository().getDescriptor(Repository.OPTION_VERSIONING_SUPPORTED);
return Boolean.valueOf(desc);
}
}