| /* |
| * Copyright 2000-2014 JetBrains s.r.o. |
| * |
| * Licensed 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 com.intellij.util; |
| |
| import com.intellij.concurrency.AsyncFuture; |
| import com.intellij.concurrency.AsyncUtil; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| import java.util.Collection; |
| import java.util.Iterator; |
| |
| /** |
| * @author peter |
| */ |
| public abstract class AbstractQuery<Result> implements Query<Result> { |
| private boolean myIsProcessing = false; |
| |
| @Override |
| @NotNull |
| public Collection<Result> findAll() { |
| assertNotProcessing(); |
| final CommonProcessors.CollectProcessor<Result> processor = new CommonProcessors.CollectProcessor<Result>(); |
| forEach(processor); |
| return processor.getResults(); |
| } |
| |
| @Override |
| public Iterator<Result> iterator() { |
| assertNotProcessing(); |
| return new UnmodifiableIterator<Result>(findAll().iterator()); |
| } |
| |
| @Override |
| @Nullable |
| public Result findFirst() { |
| assertNotProcessing(); |
| final CommonProcessors.FindFirstProcessor<Result> processor = new CommonProcessors.FindFirstProcessor<Result>(); |
| forEach(processor); |
| return processor.getFoundValue(); |
| } |
| |
| private void assertNotProcessing() { |
| assert !myIsProcessing : "Operation is not allowed while query is being processed"; |
| } |
| |
| @NotNull |
| @Override |
| public Result[] toArray(@NotNull Result[] a) { |
| assertNotProcessing(); |
| |
| final Collection<Result> all = findAll(); |
| return all.toArray(a); |
| } |
| |
| @Override |
| public boolean forEach(@NotNull Processor<Result> consumer) { |
| assertNotProcessing(); |
| |
| myIsProcessing = true; |
| try { |
| return processResults(consumer); |
| } |
| finally { |
| myIsProcessing = false; |
| } |
| } |
| |
| @NotNull |
| @Override |
| public AsyncFuture<Boolean> forEachAsync(@NotNull Processor<Result> consumer) { |
| return AsyncUtil.wrapBoolean(forEach(consumer)); |
| } |
| |
| protected abstract boolean processResults(@NotNull Processor<Result> consumer); |
| |
| @NotNull |
| protected AsyncFuture<Boolean> processResultsAsync(@NotNull Processor<Result> consumer) { |
| return AsyncUtil.wrapBoolean(processResults(consumer)); |
| } |
| } |