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/*
* 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));
}
}
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