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The Adobe Experience Manager SDK
/*
* 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.lock;
import org.apache.jackrabbit.webdav.DavException;
import org.apache.jackrabbit.webdav.DavResource;
import org.apache.jackrabbit.webdav.DavResourceIterator;
import org.apache.jackrabbit.webdav.DavServletResponse;
import java.util.HashMap;
import java.util.Map;
/**
* Simple manager for webdav locks.
*/
public class SimpleLockManager implements LockManager {
/** map of locks */
private Map locks = new HashMap();
/**
*
* @param lockToken
* @param resource
* @return
* @see LockManager#hasLock(String, org.apache.jackrabbit.webdav.DavResource)
*/
public boolean hasLock(String lockToken, DavResource resource) {
ActiveLock lock = locks.get(resource.getResourcePath());
if (lock != null && lock.getToken().equals(lockToken)) {
return true;
}
return false;
}
/**
* Returns the lock applying to the given resource or null if
* no lock can be found.
*
* @param type
* @param scope
* @param resource
* @return lock that applies to the given resource or null.
*/
public synchronized ActiveLock getLock(Type type, Scope scope, DavResource resource) {
if (!(Type.WRITE.equals(type) && Scope.EXCLUSIVE.equals(scope))) {
return null;
}
return getLock(resource.getResourcePath());
}
/**
* Looks for a valid lock at the given path or a deep lock present with
* a parent path.
*
* @param path
* @return
*/
private ActiveLock getLock(String path) {
ActiveLock lock = locks.get(path);
if (lock != null) {
// check if not expired
if (lock.isExpired()) {
lock = null;
}
}
if (lock == null) {
// check, if child of deep locked parent
if (!path.equals("/")) {
ActiveLock parentLock = getLock(getParentPath(path));
if (parentLock != null && parentLock.isDeep()) {
lock = parentLock;
}
}
}
return lock;
}
/**
* Adds the lock for the given resource, replacing any existing lock.
*
* @param lockInfo
* @param resource being the lock holder
*/
public synchronized ActiveLock createLock(LockInfo lockInfo,
DavResource resource)
throws DavException {
if (lockInfo == null || resource == null) {
throw new IllegalArgumentException("Neither lockInfo nor resource must be null.");
}
String resourcePath = resource.getResourcePath();
// test if there is already a lock present on this resource
ActiveLock lock = locks.get(resourcePath);
if (lock != null && lock.isExpired()) {
locks.remove(resourcePath);
lock = null;
}
if (lock != null) {
throw new DavException(DavServletResponse.SC_LOCKED, "Resource '" + resource.getResourcePath() + "' already holds a lock.");
}
// test if the new lock would conflict with any lock inherited from the
// collection or with a lock present on any member resource.
for (String key : locks.keySet()) {
// TODO: is check for lock on internal-member correct?
if (isDescendant(key, resourcePath)) {
ActiveLock l = locks.get(key);
if (l.isDeep() || (key.equals(getParentPath(resourcePath)) && !resource.isCollection())) {
throw new DavException(DavServletResponse.SC_LOCKED, "Resource '" + resource.getResourcePath() + "' already inherits a lock by its collection.");
}
} else if (isDescendant(resourcePath, key)) {
if (lockInfo.isDeep() || isInternalMember(resource, key)) {
throw new DavException(DavServletResponse.SC_CONFLICT, "Resource '" + resource.getResourcePath() + "' cannot be locked due to a lock present on the member resource '" + key + "'.");
}
}
}
lock = new DefaultActiveLock(lockInfo);
locks.put(resource.getResourcePath(), lock);
return lock;
}
/**
*
* @param lockInfo
* @param lockToken
* @param resource
* @return
* @throws DavException
* @see DavResource#refreshLock(org.apache.jackrabbit.webdav.lock.LockInfo, String)
*/
public ActiveLock refreshLock(LockInfo lockInfo, String lockToken, DavResource resource)
throws DavException {
ActiveLock lock = getLock(lockInfo.getType(), lockInfo.getScope(), resource);
if (lock == null) {
throw new DavException(DavServletResponse.SC_PRECONDITION_FAILED);
} else if (!lock.getToken().equals(lockToken)) {
throw new DavException(DavServletResponse.SC_LOCKED);
}
lock.setTimeout(lockInfo.getTimeout());
return lock;
}
/**
* Remove the lock hold by the given resource.
*
* @param lockToken
* @param resource that is the lock holder
*/
public synchronized void releaseLock(String lockToken, DavResource resource)
throws DavException {
if (!locks.containsKey(resource.getResourcePath())) {
throw new DavException(DavServletResponse.SC_PRECONDITION_FAILED);
}
ActiveLock lock = locks.get(resource.getResourcePath());
if (lock.getToken().equals(lockToken)) {
locks.remove(resource.getResourcePath());
} else {
throw new DavException(DavServletResponse.SC_LOCKED);
}
}
/**
* Return true, if the resource with the given memberPath is a internal
* non-collection member of the given resource, thus affected by a
* non-deep lock present on the resource.
*
* @param resource
* @param memberPath
* @return
*/
private static boolean isInternalMember(DavResource resource, String memberPath) {
if (resource.getResourcePath().equals(getParentPath(memberPath))) {
// find the member with the given path
DavResourceIterator it = resource.getMembers();
while (it.hasNext()) {
DavResource member = it.nextResource();
if (member.getResourcePath().equals(memberPath)) {
// return true if that member is not a collection
return !member.isCollection();
}
}
}
return false;
}
/**
* @param path Path to retrieve the parent path for.
* @return empty string if the specified path contains no '/', "/" if the
* last index of '/' is zero. Otherwise the last segment is cut off the
* specified path.
*/
private static String getParentPath(String path) {
int idx = path.lastIndexOf('/');
switch (idx) {
case -1:
return "";
case 0:
return "/";
default:
return path.substring(0, idx);
}
}
/**
* Determines if the descendant path is hierarchical a
* descendant of path.
*
* @param path the current path
* @param descendant the potential descendant
* @return true if the descendant is a descendant;
* false otherwise.
*/
private static boolean isDescendant(String path, String descendant) {
String pattern = path.endsWith("/") ? path : path + "/";
return !pattern.equals(descendant) && descendant.startsWith(pattern);
}
}
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