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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.
*/
/*
* @author max
*/
package com.intellij.util;
import com.intellij.concurrency.*;
import org.jetbrains.annotations.NotNull;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
public class MergeQuery<T> implements Query<T>{
private final Query<? extends T> myQuery1;
private final Query<? extends T> myQuery2;
public MergeQuery(@NotNull Query<? extends T> query1, @NotNull Query<? extends T> query2) {
myQuery1 = query1;
myQuery2 = query2;
}
@Override
@NotNull
public Collection<T> findAll() {
List<T> results = new ArrayList<T>();
forEach(new CommonProcessors.CollectProcessor<T>(results));
return results;
}
@Override
public T findFirst() {
final CommonProcessors.FindFirstProcessor<T> processor = new CommonProcessors.FindFirstProcessor<T>();
forEach(processor);
return processor.getFoundValue();
}
@Override
public boolean forEach(@NotNull final Processor<T> consumer) {
return processSubQuery(consumer, myQuery1) && processSubQuery(consumer, myQuery2);
}
@NotNull
@Override
public AsyncFuture<Boolean> forEachAsync(@NotNull final Processor<T> consumer) {
final AsyncFutureResult<Boolean> result = AsyncFutureFactory.getInstance().createAsyncFutureResult();
final AsyncFuture<Boolean> fq = processSubQueryAsync(consumer, myQuery1);
fq.addConsumer(SameThreadExecutor.INSTANCE, new DefaultResultConsumer<Boolean>(result) {
@Override
public void onSuccess(Boolean value) {
if (value.booleanValue()) {
final AsyncFuture<Boolean> fq2 = processSubQueryAsync(consumer, myQuery2);
fq2.addConsumer(SameThreadExecutor.INSTANCE, new DefaultResultConsumer<Boolean>(result));
}
else {
result.set(false);
}
}
});
return result;
}
private <V extends T> boolean processSubQuery(@NotNull final Processor<T> consumer, @NotNull Query<V> query1) {
// Query.forEach(Processor<T> consumer) should be actually Query.forEach(Processor<? super T> consumer) but it is too late now
return query1.forEach((Processor<V>)consumer);
}
private <V extends T> AsyncFuture<Boolean> processSubQueryAsync(@NotNull final Processor<T> consumer, @NotNull Query<V> query1) {
return query1.forEachAsync((Processor<V>)consumer);
}
@NotNull
@Override
public T[] toArray(@NotNull final T[] a) {
final Collection<T> results = findAll();
return results.toArray(a);
}
@Override
public Iterator<T> iterator() {
return findAll().iterator();
}
}
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