/*
* ModeShape (http://www.modeshape.org)
*
* 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.
*/
package org.modeshape.jcr.cache.change;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import org.modeshape.jcr.ExecutionContext;
import org.modeshape.jcr.cache.CachedNode.Properties;
import org.modeshape.jcr.cache.NodeKey;
import org.modeshape.jcr.value.BinaryKey;
import org.modeshape.jcr.value.Name;
import org.modeshape.jcr.value.Path;
import org.modeshape.jcr.value.Path.Segment;
import org.modeshape.jcr.value.Property;
/**
* An adapter class that processes {@link ChangeSet} instances and for each {@link Change} calls the appropriate protected method
* that, by default, do nothing. Implementations simply override at least one of the relevant methods for the kind of changes they
* expect.
*
* @author Randall Hauch (rhauch@redhat.com)
*/
public abstract class ChangeSetAdapter implements ChangeSetListener {
public static interface NodeTypePredicate {
/**
* Determine if the given primary type and mixin types satisfies the node type requirements of an event.
*
* @param primaryType the primary type of the event
* @param mixinTypes
* @return true if the event should be processed, or false otherwise
*/
boolean matchesType( Name primaryType,
Set<Name> mixinTypes );
}
protected final ExecutionContext context;
protected final NodeTypePredicate predicate;
/**
* @param context the execution context in which this adapter is supposed to run; may not be null
*/
public ChangeSetAdapter( ExecutionContext context ) {
this(context, null);
}
public ChangeSetAdapter( ExecutionContext context,
NodeTypePredicate predicate ) {
assert context != null;
this.context = context;
this.predicate = predicate;
}
@Override
public void notify( ChangeSet changeSet ) {
final String workspaceName = changeSet.getWorkspaceName();
if (workspaceName != null) {
if (includesWorkspace(workspaceName)) {
try {
beginWorkspaceChanges();
final Map<Name, AbstractPropertyChange> propChanges = new HashMap<>();
NodeKey lastKey = null;
for (Change change : changeSet) {
if (change instanceof AbstractNodeChange) {
AbstractNodeChange anc = (AbstractNodeChange)change;
if (!matchesType(anc.getPrimaryType(), anc.getMixinTypes())) continue;
if (change instanceof NodeAdded) {
firePropertyChanges(lastKey, propChanges);
NodeAdded added = (NodeAdded)change;
addNode(workspaceName, added.getKey(), added.getPath(), added.getPrimaryType(),
added.getMixinTypes(), props(added.getProperties()), added.isQueryable());
} else if (change instanceof NodeRemoved) {
firePropertyChanges(lastKey, propChanges);
NodeRemoved removed = (NodeRemoved)change;
removeNode(workspaceName, removed.getKey(), removed.getParentKey(), removed.getPath(),
removed.getPrimaryType(), removed.getMixinTypes(), removed.isQueryable());
} else if (change instanceof AbstractPropertyChange) {
AbstractPropertyChange propChange = (AbstractPropertyChange)change;
if (!propChange.getKey().equals(lastKey)) firePropertyChanges(lastKey, propChanges);
propChanges.put(propChange.getProperty().getName(), propChange);
} else if (change instanceof NodeChanged) {
firePropertyChanges(lastKey, propChanges);
NodeChanged nodeChanged = (NodeChanged)change;
changeNode(workspaceName, nodeChanged.getKey(), nodeChanged.getPath(),
nodeChanged.getPrimaryType(), nodeChanged.getMixinTypes(), nodeChanged.isQueryable());
} else if (change instanceof NodeMoved) {
firePropertyChanges(lastKey, propChanges);
NodeMoved moved = (NodeMoved)change;
moveNode(workspaceName, moved.getKey(), moved.getPrimaryType(), moved.getMixinTypes(),
moved.getNewParent(), moved.getOldParent(), moved.getNewPath(), moved.getOldPath(),
moved.isQueryable());
} else if (change instanceof NodeRenamed) {
firePropertyChanges(lastKey, propChanges);
NodeRenamed renamed = (NodeRenamed)change;
renameNode(workspaceName, renamed.getKey(), renamed.getPath(), renamed.getOldSegment(),
renamed.getPrimaryType(), renamed.getMixinTypes(), renamed.isQueryable());
} else if (change instanceof NodeReordered) {
firePropertyChanges(lastKey, propChanges);
NodeReordered reordered = (NodeReordered)change;
reorderNode(workspaceName, reordered.getKey(), reordered.getPrimaryType(),
reordered.getMixinTypes(), reordered.getParent(), reordered.getPath(),
reordered.getOldPath(), reordered.getReorderedBeforePath(), reordered.isQueryable());
} else if (change instanceof NodeSequenced) {
firePropertyChanges(lastKey, propChanges);
NodeSequenced s = (NodeSequenced)change;
sequenced(workspaceName, s.getKey(), s.getPath(), s.getPrimaryType(), s.getMixinTypes(),
s.getOutputNodeKey(), s.getOutputNodePath(), s.getOutputPath(), s.getUserId(),
s.getSelectedPath(), s.getSequencerName(), s.isQueryable());
} else if (change instanceof NodeSequencingFailure) {
firePropertyChanges(lastKey, propChanges);
NodeSequencingFailure f = (NodeSequencingFailure)change;
sequenceFailure(workspaceName, f.getKey(), f.getPath(), f.getPrimaryType(), f.getMixinTypes(),
f.getOutputPath(), f.getUserId(), f.getSelectedPath(), f.getSequencerName(),
f.isQueryable(), f.getCause());
}
lastKey = ((AbstractNodeChange)change).getKey();
}
}
if (lastKey != null) {
firePropertyChanges(lastKey, propChanges);
}
} finally {
completeWorkspaceChanges();
}
}
} else {
beginChanges();
for (Change change : changeSet) {
if (change instanceof WorkspaceAdded) {
WorkspaceAdded added = (WorkspaceAdded)change;
addWorkspace(added.getWorkspaceName());
} else if (change instanceof WorkspaceRemoved) {
WorkspaceRemoved removed = (WorkspaceRemoved)change;
removeWorkspace(removed.getWorkspaceName());
} else if (change instanceof RepositoryMetadataChanged) {
repositoryMetadataChanged();
} else if (change instanceof BinaryValueUnused) {
BinaryValueUnused bvu = (BinaryValueUnused)change;
binaryValueUnused(bvu.getKey());
}
}
completeChanges();
}
}
private boolean matchesType( Name primaryType,
Set<Name> mixinTypes ) {
return predicate == null ? true : predicate.matchesType(primaryType, mixinTypes);
}
/**
* Signals the beginning of processing for the workspace-related changes in a transaction described by a single
* {@link ChangeSet}.
*
* @see #completeWorkspaceChanges()
*/
protected void beginWorkspaceChanges() {
}
/**
* Signals the end of processing for the workspace-related changes in a transaction described by a single {@link ChangeSet}.
*
* @see #beginWorkspaceChanges()
*/
protected void completeWorkspaceChanges() {
}
/**
* Signals the beginning of processing for the changes in a transaction described by a single {@link ChangeSet}.
*
* @see #completeChanges()
*/
protected void beginChanges() {
}
/**
* Signals the end of processing for the changes in a transaction described by a single {@link ChangeSet}.
*
* @see #beginChanges()
*/
protected void completeChanges() {
}
private void firePropertyChanges( NodeKey key,
Map<Name, AbstractPropertyChange> propChanges ) {
if (!propChanges.isEmpty()) {
modifyProperties(key, propChanges);
propChanges.clear();
}
}
/**
* Handle the addition, change, and removal of one or more properties of a single node. This method is called once for each
* existing node whose properties are modified.
*
* @param key the unique key for the node; may not be null
* @param propChanges the map of property modification events, keyed by the names of the properties; never null and never
* empty
*/
protected void modifyProperties( NodeKey key,
Map<Name, AbstractPropertyChange> propChanges ) {
}
private final Properties props( final Map<Name, Property> properties ) {
return new Properties() {
@Override
public org.modeshape.jcr.value.Property getProperty( Name name ) {
return properties.get(name);
}
@Override
public Iterator<Property> iterator() {
return properties.values().iterator();
}
};
}
/**
* Determine whether changes in the named workspace should be processed. By default this method returns {@code true}, which
* means changes to content in all workspaces are handled by this adapter.
*
* @param workspaceName the workspace that has changes in content
* @return true if the changes should be processed, or false otherwise
*/
protected boolean includesWorkspace( String workspaceName ) {
return true;
}
/**
* Handle the addition of a node.
*
* @param workspaceName the workspace in which the node information should be available; may not be null
* @param key the unique key for the node; may not be null
* @param path the path of the node; may not be null
* @param primaryType the primary type of the node; may not be null
* @param mixinTypes the mixin types for the node; may not be null but may be empty
* @param properties the properties of the node; may not be null but may be empty
* @param queryable true if the node is queryable, false otherwise
*/
protected void addNode( String workspaceName,
NodeKey key,
Path path,
Name primaryType,
Set<Name> mixinTypes,
Properties properties,
boolean queryable ) {
}
/**
* Handle the reindexing of a node.
*
* @param workspaceName the workspace in which the node information should be available; may not be null
* @param key the unique key for the node; may not be null
* @param path the path of the node; may not be null
* @param primaryType the primary type of the node; may not be null
* @param mixinTypes the mixin types for the node; may not be null but may be empty
* @param properties the properties of the node; may not be null but may be empty
* @param queryable true if the node is queryable, false otherwise
*/
protected void reindexNode( String workspaceName,
NodeKey key,
Path path,
Name primaryType,
Set<Name> mixinTypes,
Properties properties,
boolean queryable ) {
}
/**
* Handle the removal of a node.
*
* @param workspaceName the workspace in which the node information should be available; may not be null
* @param key the unique key for the node; may not be null
* @param parentKey the unique key for the parent of the node; may not be null
* @param path the path of the node; may not be null
* @param primaryType the primary type of the node; may not be null
* @param mixinTypes the mixin types for the node; may not be null but may be empty
* @param queryable true if the node is queryable, false otherwise
*/
protected void removeNode( String workspaceName,
NodeKey key,
NodeKey parentKey,
Path path,
Name primaryType,
Set<Name> mixinTypes,
boolean queryable ) {
}
/**
* Handle the change of a node.
*
* @param workspaceName the workspace in which the node information should be available; may not be null
* @param key the unique key for the node; may not be null
* @param path the path of the node; may not be null
* @param primaryType the primary type of the node; may not be null
* @param mixinTypes the mixin types for the node; may not be null but may be empty
* @param queryable true if the node is queryable, false otherwise
*/
protected void changeNode( String workspaceName,
NodeKey key,
Path path,
Name primaryType,
Set<Name> mixinTypes,
boolean queryable ) {
}
/**
* Handle the move of a node.
*
* @param workspaceName the workspace in which the node information should be available; may not be null
* @param key the unique key for the node; may not be null
* @param primaryType the primary type of the node; may not be null
* @param mixinTypes the mixin types for the node; may not be null but may be empty
* @param oldParent the key of the node's parent before it was moved; may not be null
* @param newParent the key of the node's parent after it was moved; may not be null
* @param newPath the new path of the node after it was moved; may not be null
* @param oldPath the old path of the node before it was moved; may not be null
* @param queryable true if the node is queryable, false otherwise
*/
protected void moveNode( String workspaceName,
NodeKey key,
Name primaryType,
Set<Name> mixinTypes,
NodeKey oldParent,
NodeKey newParent,
Path newPath,
Path oldPath,
boolean queryable ) {
}
/**
* Handle the renaming of a node.
*
* @param workspaceName the workspace in which the node information should be available; may not be null
* @param key the unique key for the node; may not be null
* @param newPath the new path of the node after it was moved; may not be null
* @param oldSegment the old segment of the node before it was moved; may not be null
* @param primaryType the primary type of the node; may not be null
* @param mixinTypes the mixin types for the node; may not be null but may be empty
* @param queryable true if the node is queryable, false otherwise
*/
protected void renameNode( String workspaceName,
NodeKey key,
Path newPath,
Segment oldSegment,
Name primaryType,
Set<Name> mixinTypes,
boolean queryable ) {
}
/**
* Handle the reordering of a node.
*
* @param workspaceName the workspace in which the node information should be available; may not be null
* @param key the unique key for the node; may not be null
* @param primaryType the primary type of the node; may not be null
* @param mixinTypes the mixin types for the node; may not be null but may be empty
* @param parent the key of the node's parent; may not be null
* @param newPath the new path of the node after it was moved; may not be null
* @param oldPath the old path of the node before it was moved; may not be null
* @param reorderedBeforePath the path of the node before which the node was placed; null if it was moved to the end
* @param queryable true if the node is queryable, false otherwise
*/
protected void reorderNode( String workspaceName,
NodeKey key,
Name primaryType,
Set<Name> mixinTypes,
NodeKey parent,
Path newPath,
Path oldPath,
Path reorderedBeforePath,
boolean queryable ) {
}
protected void sequenced( String workspaceName,
NodeKey sequencedNodeKey,
Path sequencedNodePath,
Name sequencedNodePrimaryType,
Set<Name> sequencedNodeMixinTypes,
NodeKey outputNodeKey,
Path outputNodePath,
String outputPath,
String userId,
String selectedPath,
String sequencerName,
boolean queryable ) {
}
protected void sequenceFailure( String workspaceName,
NodeKey sequencedNodeKey,
Path sequencedNodePath,
Name sequencedNodePrimaryType,
Set<Name> sequencedNodeMixinTypes,
String outputPath,
String userId,
String selectedPath,
String sequencerName,
boolean queryable,
Throwable cause ) {
}
/**
* Handle the changing of the repository metadata information.
*/
protected void repositoryMetadataChanged() {
}
/**
* Handle the marking of a binary value as being unused.
*
* @param key the binary key of the binary value that is no longer used; may not be null
*/
protected void binaryValueUnused( BinaryKey key ) {
}
/**
* Handle the addition of a new workspace in the repository.
*
* @param workspaceName the name of the workspace that was added; may not be null
*/
protected void addWorkspace( String workspaceName ) {
}
/**
* Handle the removal of a workspace in the repository.
*
* @param workspaceName the name of the workspace that was removed; may not be null
*/
protected void removeWorkspace( String workspaceName ) {
}
}