/*
 * Copyright 2000-2006 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 gnu.trove.THashSet;
import org.jetbrains.annotations.NotNull;

import java.util.*;

/**
 * @author max
 */
public class UniqueResultsQuery<T> implements Query<T> {
  private Query<T> myOriginal;

  public UniqueResultsQuery(final Query<T> original) {
    myOriginal = original;
  }

  public T findFirst() {
    return myOriginal.findFirst();
  }

  public boolean forEach(final Processor<T> consumer) {
    final Set<T> processedElements = new THashSet<T>();
    myOriginal.forEach(new Processor<T>() {
      public boolean process(final T t) {
        if (processedElements.contains(t)) return true;
        processedElements.add(t);

        if (!consumer.process(t)) return false;

        return true;
      }
    });

    return true;
  }

  @NotNull
  public Collection<T> findAll() {
    final List<T> result = new ArrayList<T>();
    forEach(new Processor<T>() {
      public boolean process(final T t) {
        result.add(t);
        return true;
      }
    });

    return result;
  }

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

  public Iterator<T> iterator() {
    return findAll().iterator();
  }
}

@@ -1090,24 +1090,31 @@
 t%3CT%3E();%0A    
+return 
 myOriginal.f
@@ -1363,26 +1363,8 @@
  %7D);
-%0A%0A    return true;
 %0A  %7D

correct return value for UniqueResultsQuery.forEach (fixes delete of referenced fields in UI Designer)