com.intellij.util.MergeQuery Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of core-api Show documentation
A packaging of the IntelliJ Community Edition core-api library. This is release number 1 of trunk branch 142.
The newest version!
/*
 * 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 implements Query{
  private final Query myQuery1;
  private final Query myQuery2;

  public MergeQuery(@NotNull Query query1, @NotNull Query query2) {
    myQuery1 = query1;
    myQuery2 = query2;
  }

  @Override
  @NotNull
  public Collection findAll() {
    List results = new ArrayList();
    forEach(new CommonProcessors.CollectProcessor(results));
    return results;
  }

  @Override
  public T findFirst() {
    final CommonProcessors.FindFirstProcessor processor = new CommonProcessors.FindFirstProcessor();
    forEach(processor);
    return processor.getFoundValue();
  }

  @Override
  public boolean forEach(@NotNull final Processor consumer) {
    return processSubQuery(consumer, myQuery1) && processSubQuery(consumer, myQuery2);
  }

  @NotNull
  @Override
  public AsyncFuture forEachAsync(@NotNull final Processor consumer) {
    final AsyncFutureResult result = AsyncFutureFactory.getInstance().createAsyncFutureResult();

    final AsyncFuture fq = processSubQueryAsync(consumer, myQuery1);

    fq.addConsumer(SameThreadExecutor.INSTANCE, new DefaultResultConsumer(result) {
      @Override
      public void onSuccess(Boolean value) {
        if (value.booleanValue()) {
          final AsyncFuture fq2 = processSubQueryAsync(consumer, myQuery2);
          fq2.addConsumer(SameThreadExecutor.INSTANCE, new DefaultResultConsumer(result));
        }
        else {
          result.set(false);
        }
      }
    });
    return result;
  }


  private  boolean processSubQuery(@NotNull final Processor consumer, @NotNull Query query1) {
    // Query.forEach(Processor consumer) should be actually Query.forEach(Processor consumer) but it is too late now
    return query1.forEach((Processor)consumer);
  }

  private  AsyncFuture processSubQueryAsync(@NotNull final Processor consumer, @NotNull Query query1) {
    return query1.forEachAsync((Processor)consumer);
  }

  @NotNull
  @Override
  public T[] toArray(@NotNull final T[] a) {
    final Collection results = findAll();
    return results.toArray(a);
  }

  @Override
  public Iterator iterator() {
    return findAll().iterator();
  }
}