/*
 * 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.usageView;

import com.intellij.lang.findUsages.DescriptiveNameUtil;
import com.intellij.psi.ElementDescriptionLocation;
import com.intellij.psi.ElementDescriptionProvider;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiNamedElement;
import com.intellij.psi.meta.PsiMetaData;
import com.intellij.psi.meta.PsiMetaOwner;
import org.jetbrains.annotations.NotNull;

/**
 * @author yole
 */
public class UsageViewShortNameLocation extends ElementDescriptionLocation {
  private UsageViewShortNameLocation() {
  }

  public static final UsageViewShortNameLocation INSTANCE = new UsageViewShortNameLocation();

  @Override
  public ElementDescriptionProvider getDefaultProvider() {
    return DEFAULT_PROVIDER;
  }

  private static final ElementDescriptionProvider DEFAULT_PROVIDER = new ElementDescriptionProvider() {
    @Override
    public String getElementDescription(@NotNull final PsiElement element, @NotNull final ElementDescriptionLocation location) {
      if (!(location instanceof UsageViewShortNameLocation)) return null;

      if (element instanceof PsiMetaOwner) {
        PsiMetaData metaData = ((PsiMetaOwner)element).getMetaData();
        if (metaData!=null) return DescriptiveNameUtil.getMetaDataName(metaData);
      }

      if (element instanceof PsiNamedElement) {
        return ((PsiNamedElement)element).getName();
      }
      return "";
    }
  };
}