java/java-impl/src/com/intellij/codeInsight/JavaContainerProvider.java

/*
 * Copyright 2000-2012 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;

import com.intellij.psi.PsiClass;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiMember;
import com.intellij.psi.PsiTypeParameter;
import org.jetbrains.annotations.NotNull;

/**
 * @author Max Medvedev
 */
public class JavaContainerProvider implements ContainerProvider {
  @Override
  public PsiElement getContainer(@NotNull PsiElement item) {
    if (item instanceof PsiTypeParameter) return item.getParent().getParent();
    if (item instanceof PsiClass) {
      final PsiClass containingClass = ((PsiClass)item).getContainingClass();
      return containingClass != null ? containingClass : item.getContainingFile();
    }
    if (item instanceof PsiMember) return ((PsiMember)item).getContainingClass();

    return null;
  }
}