External file text search engine support.

editor/tools/plugins/com.google.dart.tools.search/src/com/google/dart/tools/search/ui/text/ExternalRootSearchScopeHelper.java

Index: editor/tools/plugins/com.google.dart.tools.search/src/com/google/dart/tools/search/ui/text/ExternalRootSearchScopeHelper.java
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--- editor/tools/plugins/com.google.dart.tools.search/src/com/google/dart/tools/search/ui/text/ExternalRootSearchScopeHelper.java	(revision 0)
+++ editor/tools/plugins/com.google.dart.tools.search/src/com/google/dart/tools/search/ui/text/ExternalRootSearchScopeHelper.java	(revision 0)
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2012, the Dart project authors.
+ * 
+ * Licensed under the Eclipse Public License v1.0 (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.eclipse.org/legal/epl-v10.html
+ * 
+ * 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.google.dart.tools.search.ui.text;
+
+import com.google.dart.tools.core.model.DartSdk;
+
+import org.eclipse.core.resources.IResource;
+
+import java.io.File;
+
+/**
+ * A helper for calculating external root search scopes.
+ */
+public class ExternalRootSearchScopeHelper {
+
+  private static final File SDK_DIR = DartSdk.getInstance().getDirectory();
+  private static final File[] DEFAULT_ROOTS = new File[] {SDK_DIR};
+
+  /**
+   * Calculate external roots based on a given set of workspace resources.
+   * 
+   * @param workspaceRoots the workspace root resources
+   * @return the calculated external roots
+   */
+  public static File[] calculateExternalRoots(IResource[] workspaceRoots) {
+    return DEFAULT_ROOTS;
+  }
+
+}