| /* |
| * 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 org.apache.jackrabbit.oak.api.PropertyState; |
| import org.apache.jackrabbit.oak.plugins.observation.filter.UniversalFilter.Selector; |
| import org.apache.jackrabbit.oak.spi.state.NodeState; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| /** |
| * A selector for selecting a node at a relative path from the node selected by |
| * an initial selector. |
| * <p> |
| * <em>Note:</em> selecting the parent of the root node will return a non existing |
| * {@code NodeState} instance. |
| */ |
| public class RelativePathSelector implements Selector { |
| private final Iterable<String> path; |
| private final Selector selector; |
| |
| /** |
| * @param path path to select from |
| * @param selector selector to base {@code path} upon |
| */ |
| public RelativePathSelector(@NotNull String path, @NotNull Selector selector) { |
| this.path = elements(checkNotNull(path)); |
| this.selector = checkNotNull(selector); |
| } |
| |
| @NotNull |
| @Override |
| public NodeState select(@NotNull UniversalFilter filter, |
| @Nullable PropertyState before, @Nullable PropertyState after) { |
| return select(selector.select(filter, before, after)); |
| } |
| |
| @NotNull |
| @Override |
| public NodeState select(@NotNull UniversalFilter filter, |
| @NotNull String name, @NotNull NodeState before, @NotNull 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; |
| } |
| |
| } |