JavaTypeHierarchyProvider.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.ide.hierarchy.type;

import com.intellij.codeInsight.TargetElementUtil;
import com.intellij.ide.hierarchy.HierarchyBrowser;
import com.intellij.ide.hierarchy.HierarchyProvider;
import com.intellij.ide.hierarchy.TypeHierarchyBrowserBase;
import com.intellij.openapi.actionSystem.CommonDataKeys;
import com.intellij.openapi.actionSystem.DataContext;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.project.Project;
import com.intellij.psi.*;
import org.jetbrains.annotations.NotNull;

/**
 * @author yole
 */
public class JavaTypeHierarchyProvider implements HierarchyProvider {
  private static final Logger LOG = Logger.getInstance("#com.intellij.ide.hierarchy.type.JavaTypeHierarchyProvider");
  public PsiElement getTarget(@NotNull final DataContext dataContext) {
    final Project project = CommonDataKeys.PROJECT.getData(dataContext);
    if (project == null) return null;

    final Editor editor = CommonDataKeys.EDITOR.getData(dataContext);
    if (LOG.isDebugEnabled()) {
      LOG.debug("editor " + editor);
    }
    if (editor != null) {
      final PsiFile file = PsiDocumentManager.getInstance(project).getPsiFile(editor.getDocument());
      if (file == null) return null;

      final PsiElement targetElement = TargetElementUtil.findTargetElement(editor, TargetElementUtil.ELEMENT_NAME_ACCEPTED |
                                                                                   TargetElementUtil.REFERENCED_ELEMENT_ACCEPTED |
                                                                                   TargetElementUtil.LOOKUP_ITEM_ACCEPTED);
      if (LOG.isDebugEnabled()) {
        LOG.debug("target element " + targetElement);
      }
      if (targetElement instanceof PsiClass) {
        return targetElement;
      }

      final int offset = editor.getCaretModel().getOffset();
      PsiElement element = file.findElementAt(offset);
      while (element != null) {
        if (LOG.isDebugEnabled()) {
          LOG.debug("context element " + element);
        }
        if (element instanceof PsiFile) {
          if (!(element instanceof PsiClassOwner)) return null;
          final PsiClass[] classes = ((PsiClassOwner)element).getClasses();
          return classes.length == 1 ? classes[0] : null;
        }
        if (element instanceof PsiClass && !(element instanceof PsiAnonymousClass) && !(element instanceof PsiSyntheticClass)) {
          return element;
        }
        element = element.getParent();
      }

      return null;
    }
    else {
      final PsiElement element = CommonDataKeys.PSI_ELEMENT.getData(dataContext);
      return element instanceof PsiClass ? (PsiClass)element : null;
    }
  }

  @NotNull
  public HierarchyBrowser createHierarchyBrowser(final PsiElement target) {
    return new TypeHierarchyBrowser(target.getProject(), (PsiClass) target);
  }

  public void browserActivated(@NotNull final HierarchyBrowser hierarchyBrowser) {
    final TypeHierarchyBrowser browser = (TypeHierarchyBrowser)hierarchyBrowser;
    final String typeName =
      browser.isInterface() ? TypeHierarchyBrowserBase.SUBTYPES_HIERARCHY_TYPE : TypeHierarchyBrowserBase.TYPE_HIERARCHY_TYPE;
    browser.changeView(typeName);
  }
}