/* * Copyright 2000-2016 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 com.intellij.openapi.application.ReadActionProcessor; import org.jetbrains.annotations.NotNull; import org.jetbrains.annotations.Nullable; import java.util.ArrayList; import java.util.Collection; import java.util.Iterator; import java.util.List; /** * @author peter */ public abstract class AbstractQuery<Result> implements Query<Result> { private boolean myIsProcessing; @Override @NotNull public Collection<Result> findAll() { assertNotProcessing(); List<Result> result = new ArrayList<>(); Processor<Result> processor = Processors.cancelableCollectProcessor(result); forEach(processor); return result; } @Override public Iterator<Result> iterator() { assertNotProcessing(); return new UnmodifiableIterator<>(findAll().iterator()); } @Override @Nullable public Result findFirst() { assertNotProcessing(); final CommonProcessors.FindFirstProcessor<Result> processor = new CommonProcessors.FindFirstProcessor<>(); 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)); } @NotNull public static <T> Query<T> wrapInReadAction(@NotNull final Query<T> query) { return new AbstractQuery<T>() { @Override protected boolean processResults(@NotNull Processor<T> consumer) { return query.forEach(ReadActionProcessor.wrapInReadAction(consumer)); } }; } }