org.apache.jackrabbit.oak.plugins.observation.filter.RelativePathSelector Maven / Gradle / Ivy
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* 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.filter;
import static com.google.common.base.Preconditions.checkNotNull;
import static org.apache.jackrabbit.oak.commons.PathUtils.elements;
import javax.annotation.CheckForNull;
import javax.annotation.Nonnull;
import org.apache.jackrabbit.oak.api.PropertyState;
import org.apache.jackrabbit.oak.plugins.observation.filter.UniversalFilter.Selector;
import org.apache.jackrabbit.oak.spi.state.NodeState;
/**
* A selector for selecting a node at a relative path from the node selected by
* an initial selector.
*
* Note: selecting the parent of the root node will return a non existing
* {@code NodeState} instance.
*/
public class RelativePathSelector implements Selector {
private final Iterable path;
private final Selector selector;
/**
* @param path path to select from
* @param selector selector to base {@code path} upon
*/
public RelativePathSelector(@Nonnull String path, @Nonnull Selector selector) {
this.path = elements(checkNotNull(path));
this.selector = checkNotNull(selector);
}
@Nonnull
@Override
public NodeState select(@Nonnull UniversalFilter filter,
@CheckForNull PropertyState before, @CheckForNull PropertyState after) {
return select(selector.select(filter, before, after));
}
@Nonnull
@Override
public NodeState select(@Nonnull UniversalFilter filter,
@Nonnull String name, @Nonnull NodeState before, @Nonnull NodeState after) {
return select(selector.select(filter, name, before, after));
}
//------------------------------------------------------------< internal >---
private NodeState select(NodeState node) {
for (String name : path) {
node = node.getChildNode(name);
}
return node;
}
}