| /*- |
| * 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.impl.function; |
| |
| import java.util.Iterator; |
| import java.util.function.Predicate; |
| |
| import org.apache.sling.query.api.SearchStrategy; |
| import org.apache.sling.query.api.internal.ElementToIteratorFunction; |
| import org.apache.sling.query.api.internal.IteratorToIteratorFunction; |
| import org.apache.sling.query.api.internal.Option; |
| import org.apache.sling.query.api.internal.TreeProvider; |
| import org.apache.sling.query.impl.iterator.EmptyElementFilter; |
| import org.apache.sling.query.impl.selector.SelectorFunction; |
| import org.apache.sling.query.impl.util.IteratorUtils; |
| |
| public class HasFunction<T> implements ElementToIteratorFunction<T> { |
| |
| private final IteratorToIteratorFunction<T> findFunction; |
| |
| private final IteratorToIteratorFunction<T> filter; |
| |
| private HasFunction(FindFunction<T> findFunction, IteratorToIteratorFunction<T> filter) { |
| this.findFunction = new IteratorToIteratorFunctionWrapper<T>(findFunction); |
| this.filter = filter; |
| } |
| |
| public HasFunction(String selectorString, SearchStrategy searchStrategy, TreeProvider<T> provider) { |
| this(new FindFunction<T>(searchStrategy, provider, selectorString), |
| new SelectorFunction<T>(selectorString, provider, searchStrategy)); |
| } |
| |
| public HasFunction(Predicate<T> predicate, SearchStrategy searchStrategy, TreeProvider<T> provider) { |
| this(new FindFunction<>(searchStrategy, provider, ""), new FilterFunction<T>(predicate)); |
| } |
| |
| public HasFunction(Iterable<T> iterable, TreeProvider<T> provider) { |
| this.findFunction = new DescendantFunction<>(iterable, provider); |
| this.filter = new IdentityFunction<>(); |
| } |
| |
| @Override |
| public Iterator<T> apply(T input) { |
| Iterator<Option<T>> iterator = IteratorUtils.singleElementIterator(Option.of(input, 0)); |
| iterator = findFunction.apply(iterator); |
| iterator = filter.apply(iterator); |
| if (new EmptyElementFilter<>(iterator).hasNext()) { |
| return IteratorUtils.singleElementIterator(input); |
| } else { |
| return IteratorUtils.emptyIterator(); |
| } |
| } |
| } |