java/java-psi-impl/src/com/intellij/psi/impl/FindSuperElementsHelper.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.psi.impl;

import com.intellij.psi.CommonClassNames;
import com.intellij.psi.PsiClass;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiMethod;
import com.intellij.psi.util.PsiSuperMethodUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

public class FindSuperElementsHelper {
  @Nullable
  public static PsiElement[] findSuperElements(@NotNull PsiElement element) {
    if (element instanceof PsiClass) {
      PsiClass aClass = (PsiClass) element;
      List<PsiClass> allSupers = new ArrayList<PsiClass>(Arrays.asList(aClass.getSupers()));
      for (Iterator<PsiClass> iterator = allSupers.iterator(); iterator.hasNext();) {
        PsiClass superClass = iterator.next();
        if (CommonClassNames.JAVA_LANG_OBJECT.equals(superClass.getQualifiedName())) iterator.remove();
      }
      return allSupers.toArray(new PsiClass[allSupers.size()]);
    } else if (element instanceof PsiMethod) {
      PsiMethod method = (PsiMethod) element;
      if (method.isConstructor()) {
        PsiMethod constructorInSuper = PsiSuperMethodUtil.findConstructorInSuper(method);
        if (constructorInSuper != null) {
          return new PsiMethod[]{constructorInSuper};
        }
      } else {
        return method.findSuperMethods(false);
      }
    }
    return null;
  }

}