platform/lang-impl/src/com/intellij/ide/projectView/impl/ProjectAbstractTreeStructureBase.java

   1 /*
   2  * Copyright 2000-2009 JetBrains s.r.o.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package com.intellij.ide.projectView.impl;
  18
  19 import com.intellij.ide.projectView.TreeStructureProvider;
  20 import com.intellij.ide.util.treeView.AbstractTreeStructureBase;
  21 import com.intellij.openapi.extensions.Extensions;
  22 import com.intellij.openapi.project.Project;
  23
  24 import java.util.Arrays;
  25 import java.util.List;
  26
  27 public abstract class ProjectAbstractTreeStructureBase extends AbstractTreeStructureBase {
  28   private List<TreeStructureProvider> myProviders;
  29
  30   protected ProjectAbstractTreeStructureBase(Project project) {
  31     super(project);
  32   }
  33
  34   public List<TreeStructureProvider> getProviders() {
  35     if (myProviders == null) {
  36       final TreeStructureProvider[] providers = Extensions.getExtensions(TreeStructureProvider.EP_NAME, myProject);
  37       myProviders = Arrays.asList(providers);
  38     }
  39     return myProviders;
  40   }
  41
  42   public void setProviders(TreeStructureProvider... treeStructureProviders) {
  43     myProviders = treeStructureProviders == null ? null : Arrays.asList(treeStructureProviders);
  44   }
  45 }