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A packaging of the IntelliJ Community Edition core-api library. This is release number 1 of trunk branch 142.

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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 com.intellij.util.containers.ContainerUtil;
import org.jetbrains.annotations.NotNull;

import java.util.Collection;
import java.util.Iterator;

/**
 * @author max
 */
public class CollectionQuery implements Query {
  private final Collection myCollection;

  public CollectionQuery(@NotNull final Collection collection) {
    myCollection = collection;
  }

  @Override
  @NotNull
  public Collection findAll() {
    return myCollection;
  }

  @Override
  public T findFirst() {
    final Iterator i = iterator();
    return i.hasNext() ? i.next() : null;
  }

  @Override
  public boolean forEach(@NotNull final Processor consumer) {
    return ContainerUtil.process(myCollection, consumer);
  }

  @NotNull
  @Override
  public AsyncFuture forEachAsync(@NotNull Processor consumer) {
    return AsyncUtil.wrapBoolean(forEach(consumer));
  }

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

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