platform/lang-impl/src/com/intellij/codeInsight/completion/PriorityWeigher.java

/*
 * Copyright 2000-2009 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.codeInsight.completion;

import com.intellij.codeInsight.lookup.LookupElement;
import com.intellij.codeInsight.lookup.LookupItem;
import org.jetbrains.annotations.NotNull;

/**
 * @author peter
 */
public class PriorityWeigher extends CompletionWeigher {
  @Override
  public Double weigh(@NotNull LookupElement element, @NotNull CompletionLocation location) {
    final PrioritizedLookupElement prioritized = element.as(PrioritizedLookupElement.CLASS_CONDITION_KEY);
    if (prioritized != null) {
      return prioritized.getPriority();
    }

    final LookupItem item = element.as(LookupItem.CLASS_CONDITION_KEY);
    if (item != null) {
      return item.getPriority();
    }
    return 0.0;
  }

  public static class Negative extends PriorityWeigher {
    @Override
    public Double weigh(@NotNull LookupElement element, @NotNull CompletionLocation location) {
      return -super.weigh(element, location);
    }
  }

}