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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.jcr.lock;
import org.apache.jackrabbit.webdav.DavConstants;
import org.apache.jackrabbit.webdav.jcr.ItemResourceConstants;
import org.apache.jackrabbit.webdav.lock.AbstractActiveLock;
import org.apache.jackrabbit.webdav.lock.ActiveLock;
import org.apache.jackrabbit.webdav.lock.Scope;
import org.apache.jackrabbit.webdav.lock.Type;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.jcr.RepositoryException;
import javax.jcr.lock.Lock;
/**
* JcrActiveLock wraps a {@link Lock JCR lock} object.
*/
public class JcrActiveLock extends AbstractActiveLock implements ActiveLock, DavConstants {
private static Logger log = LoggerFactory.getLogger(JcrActiveLock.class);
private final Lock lock;
/**
* Create a new ActiveLock object with type '{@link Type#WRITE write}'
* and scope '{@link Scope#EXCLUSIVE exclusive}'.
*
* @param lock
*/
public JcrActiveLock(Lock lock) {
if (lock == null) {
throw new IllegalArgumentException("Can not create a ActiveLock with a 'null' argument.");
}
this.lock = lock;
}
/**
* Return true if the given lock token equals the token holding that lock.
*
* @param lockToken
* @return true if the given lock token equals this locks token.
* @see org.apache.jackrabbit.webdav.lock.ActiveLock#isLockedByToken(String)
*/
public boolean isLockedByToken(String lockToken) {
if (lockToken != null && lockToken.equals(getToken())) {
return true;
}
return false;
}
/**
* @see ActiveLock#isExpired()
*/
public boolean isExpired() {
try {
return !lock.isLive();
} catch (RepositoryException e) {
log.error("Unexpected error: " + e.getMessage());
return false;
}
}
/**
* Return the lock token if the {@link javax.jcr.Session} that obtained the lock
* is the lock token holder, null otherwise.
* NOTE: currently the token generated by the underlying JCR repository
* is not checked for compliance with RFC 2518 ("OpaqueLockToken-URI = "opaquelocktoken:"
* UUID [Extension] ; The UUID production is the string representation of a
* UUID, as defined in [ISO-11578]. Note that white space (LWS) is not allowed
* between elements of this production.").
*
* In case of session-scoped JCR 2.0 locks, the token is never exposed even
* if the current session is lock holder. In order to cope with DAV specific
* requirements and the fulfill the requirement stated above, the node's
* identifier is subsequently exposed as DAV-token.
*
* @see ActiveLock#getToken()
*/
public String getToken() {
try {
return LockTokenMapper.getDavLocktoken(lock);
} catch (RepositoryException e) {
// should never get here
log.warn("Unexpected error while retrieving node identifier for building a DAV specific lock token.",
e.getMessage());
return null;
}
}
/**
* @see ActiveLock#getOwner()
*/
public String getOwner() {
return lock.getLockOwner();
}
/**
* @see ActiveLock#setOwner(String)
*/
public void setOwner(String owner) {
throw new UnsupportedOperationException("setOwner is not implemented");
}
/**
* Calculates the milliseconds of the timeout from
* {@link javax.jcr.lock.Lock#getSecondsRemaining()}. If the timeout of
* jcr lock is undefined or infinite {@link #INFINITE_TIMEOUT} is
* returned.
*
* @see ActiveLock#getTimeout()
*/
public long getTimeout() {
try {
long to = lock.getSecondsRemaining();
long reportAs;
if (to == Long.MAX_VALUE) {
reportAs = INFINITE_TIMEOUT;
}
else if (to / 1000 <= Long.MAX_VALUE / 1000) {
// expressible as long?
reportAs = to * 1000;
}
else {
reportAs = INFINITE_TIMEOUT;
}
return reportAs;
} catch (RepositoryException e) {
return INFINITE_TIMEOUT;
}
}
/**
* Throws UnsupportedOperationException
*
* @see ActiveLock#setTimeout(long)
*/
public void setTimeout(long timeout) {
throw new UnsupportedOperationException("setTimeout is not implemented");
}
/**
* @see ActiveLock#isDeep()
*/
public boolean isDeep() {
return lock.isDeep();
}
/**
* @see ActiveLock#setIsDeep(boolean)
*/
public void setIsDeep(boolean isDeep) {
throw new UnsupportedOperationException("setIsDeep is not implemented");
}
/**
* Always returns {@link Type#WRITE}.
*
* @return {@link Type#WRITE}
* @see ActiveLock#getType()
*/
public Type getType() {
return Type.WRITE;
}
/**
* @return The scope of this lock, which may either by an {@link Scope#EXCLUSIVE exclusive}
* or {@link ItemResourceConstants#EXCLUSIVE_SESSION exclusive session scoped}
* lock.
* @see ActiveLock#getScope()
*/
public Scope getScope() {
return (lock.isSessionScoped()) ? ItemResourceConstants.EXCLUSIVE_SESSION : Scope.EXCLUSIVE;
}
}