| /*- |
| * 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.sling.query.selector; |
| |
| import org.apache.sling.query.api.Function; |
| import org.apache.sling.query.api.SearchStrategy; |
| import org.apache.sling.query.api.TreeProvider; |
| import org.apache.sling.query.function.ChildrenFunction; |
| import org.apache.sling.query.function.FindFunction; |
| import org.apache.sling.query.function.IdentityFunction; |
| import org.apache.sling.query.function.NextFunction; |
| import org.apache.sling.query.predicate.RejectingPredicate; |
| import org.apache.sling.query.selector.parser.SelectorSegment; |
| |
| public enum HierarchyOperator { |
| //@formatter:off |
| CHILD('>') { |
| @Override |
| public <T> Function<?, ?> getFunction(SelectorSegment segment, SearchStrategy strategy, TreeProvider<T> provider) { |
| return new ChildrenFunction<T>(provider); |
| } |
| }, |
| DESCENDANT(' ') { |
| @Override |
| public <T> Function<?, ?> getFunction(SelectorSegment segment, SearchStrategy strategy, TreeProvider<T> provider) { |
| return new FindFunction<T>(strategy, provider, segment); |
| } |
| }, |
| NEXT_ADJACENT('+') { |
| @Override |
| public <T> Function<?, ?> getFunction(SelectorSegment segment, SearchStrategy strategy, TreeProvider<T> provider) { |
| return new NextFunction<T>(null, provider); |
| } |
| }, |
| NEXT_SIBLINGS('~') { |
| @Override |
| public <T> Function<?, ?> getFunction(SelectorSegment segment, SearchStrategy strategy, TreeProvider<T> provider) { |
| return new NextFunction<T>(new RejectingPredicate<T>(), provider); |
| } |
| }, |
| NOOP((char)0) { |
| @Override |
| public <T> Function<?, ?> getFunction(SelectorSegment segment, SearchStrategy strategy, TreeProvider<T> provider) { |
| return new IdentityFunction<T>(); |
| } |
| }; |
| //@formatter:on |
| |
| private final char c; |
| |
| private HierarchyOperator(char c) { |
| this.c = c; |
| } |
| |
| public abstract <T> Function<?, ?> getFunction(SelectorSegment segment, SearchStrategy strategy, |
| TreeProvider<T> provider); |
| |
| public static HierarchyOperator findByCharacter(char c) { |
| for (HierarchyOperator operator : values()) { |
| if (operator.c == c) { |
| return operator; |
| } |
| } |
| return NOOP; |
| } |
| } |