/*
 * 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.platform;

import com.intellij.ide.projectView.TreeStructureProvider;
import com.intellij.ide.projectView.ViewSettings;
import com.intellij.ide.projectView.impl.nodes.ExternalLibrariesNode;
import com.intellij.ide.projectView.impl.nodes.ProjectViewModuleNode;
import com.intellij.ide.projectView.impl.nodes.ProjectViewProjectNode;
import com.intellij.ide.projectView.impl.nodes.PsiDirectoryNode;
import com.intellij.ide.util.treeView.AbstractTreeNode;
import com.intellij.openapi.project.DumbAware;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.psi.PsiDirectory;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

/**
 * @author yole
 */
public class PlatformProjectViewStructureProvider implements TreeStructureProvider, DumbAware {
  private final Project myProject;

  public PlatformProjectViewStructureProvider(Project project) {
    myProject = project;
  }

  public Collection<AbstractTreeNode> modify(final AbstractTreeNode parent, final Collection<AbstractTreeNode> children, final ViewSettings settings) {
    if (parent instanceof ProjectViewProjectNode) {
      int foundModules = 0;
      List<AbstractTreeNode> allChildren = new ArrayList<AbstractTreeNode>();
      for(AbstractTreeNode child: children) {
        if (child instanceof ProjectViewModuleNode) {
          foundModules++;
          allChildren.addAll(child.getChildren());
        }
        else if (child instanceof ExternalLibrariesNode) {
          allChildren.add(child);
        }
      }
      if (foundModules == 1) {
        return allChildren;
      }
    }
    else if (parent instanceof PsiDirectoryNode) {
      final VirtualFile vFile = ((PsiDirectoryNode)parent).getVirtualFile();
      if (vFile != null && vFile.equals(myProject.getBaseDir())) {
        final Collection<AbstractTreeNode> moduleChildren = ((PsiDirectoryNode) parent).getChildren();
        Collection<AbstractTreeNode> result = new ArrayList<AbstractTreeNode>();
        for (AbstractTreeNode moduleChild : moduleChildren) {
          if (moduleChild instanceof PsiDirectoryNode) {
            final PsiDirectory value = ((PsiDirectoryNode)moduleChild).getValue();
            if (value.getName().equals(".idea")) {
              continue;
            }
          }
          result.add(moduleChild);
        }
        return result;
      }
    }
    return children;
  }

  public Object getData(final Collection<AbstractTreeNode> selected, final String dataName) {
    return null;
  }
}

@@ -20,10 +20,10 @@
 0-20
-09
+11
  Jet
@@ -740,219 +740,8 @@
 gs;%0A
-import com.intellij.ide.projectView.impl.nodes.ExternalLibrariesNode;%0Aimport com.intellij.ide.projectView.impl.nodes.ProjectViewModuleNode;%0Aimport com.intellij.ide.projectView.impl.nodes.ProjectViewProjectNode;%0A
 impo
@@ -949,16 +949,68 @@
 roject;%0A
+import com.intellij.openapi.roots.ProjectFileIndex;%0A
 import c
@@ -1145,31 +1145,8 @@
 ion;
-%0Aimport java.util.List;
 %0A%0A/*
@@ -1576,542 +1576,8 @@
 eof 
-ProjectViewProjectNode) %7B%0A      int foundModules = 0;%0A      List%3CAbstractTreeNode%3E allChildren = new ArrayList%3CAbstractTreeNode%3E();%0A      for(AbstractTreeNode child: children) %7B%0A        if (child instanceof ProjectViewModuleNode) %7B%0A          foundModules++;%0A          allChildren.addAll(child.getChildren());%0A        %7D%0A        else if (child instanceof ExternalLibrariesNode) %7B%0A          allChildren.add(child);%0A        %7D%0A      %7D%0A      if (foundModules == 1) %7B%0A        return allChildren;%0A      %7D%0A    %7D%0A    else if (parent instanceof 
 PsiD
@@ -1700,20 +1700,44 @@
  && 
-vFile.equals
+ProjectFileIndex.SERVICE.getInstance
 (myP
@@ -1746,22 +1746,47 @@
 ject
+)
 .get
-BaseDir())
+ContentRootForFile(vFile) == vFile
 ) %7B%0A

delete the part of PlatformProjectViewStructureProvider which really is unnecessary; hide .idea under all module content roots and not only under project base dir