/*
* 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.oak.plugins.observation;
import javax.annotation.CheckForNull;
import org.apache.jackrabbit.oak.api.PropertyState;
import org.apache.jackrabbit.oak.plugins.observation.filter.EventFilter;
import org.apache.jackrabbit.oak.spi.state.NodeState;
/**
* Filtered event handler. This decorator class applies an {@link EventFilter}
* on all detected changes, and forwards the filtered change events to a given
* delegate handler.
*/
public class FilteredHandler extends DefaultEventHandler {
private final EventFilter filter;
private final EventHandler handler;
public FilteredHandler(EventFilter filter, EventHandler handler) {
this.filter = filter;
this.handler = handler;
}
@Override
public void enter(NodeState before, NodeState after) {
handler.enter(before, after);
}
@Override
public void leave(NodeState before, NodeState after) {
handler.leave(before, after);
}
@Override @CheckForNull
public EventHandler getChildHandler(
String name, NodeState before, NodeState after) {
EventFilter f = filter.create(name, before, after);
if (f != null) {
EventHandler h = handler.getChildHandler(name, before, after);
if (h != null) {
return new FilteredHandler(f, h);
}
}
return null;
}
@Override
public void propertyAdded(PropertyState after) {
if (filter.includeAdd(after)) {
handler.propertyAdded(after);
}
}
@Override
public void propertyChanged(PropertyState before, PropertyState after) {
if (filter.includeChange(before, after)) {
handler.propertyChanged(before, after);
}
}
@Override
public void propertyDeleted(PropertyState before) {
if (filter.includeDelete(before)) {
handler.propertyDeleted(before);
}
}
@Override
public void nodeAdded(String name, NodeState after) {
if (filter.includeAdd(name, after)) {
handler.nodeAdded(name, after);
}
}
@Override
public void nodeDeleted(String name, NodeState before) {
if (filter.includeDelete(name, before)) {
handler.nodeDeleted(name, before);
}
}
@Override
public void nodeMoved(String sourcePath, String name, NodeState moved) {
if (filter.includeMove(sourcePath, name, moved)) {
handler.nodeMoved(sourcePath, name, moved);
}
}
@Override
public void nodeReordered(String destName, String name, NodeState reordered) {
if (filter.includeReorder(destName, name, reordered)) {
handler.nodeReordered(destName, name, reordered);
}
}
}