External file text search engine support.

editor/tools/plugins/com.google.dart.tools.search/src/com/google/dart/tools/search/internal/core/text/ExternalFilesOfScopeCalculator.java

Index: editor/tools/plugins/com.google.dart.tools.search/src/com/google/dart/tools/search/internal/core/text/ExternalFilesOfScopeCalculator.java
===================================================================
--- editor/tools/plugins/com.google.dart.tools.search/src/com/google/dart/tools/search/internal/core/text/ExternalFilesOfScopeCalculator.java	(revision 0)
+++ editor/tools/plugins/com.google.dart.tools.search/src/com/google/dart/tools/search/internal/core/text/ExternalFilesOfScopeCalculator.java	(revision 0)
@@ -0,0 +1,66 @@
+/*
+ * 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.internal.core.text;
+
+import com.google.dart.tools.search.core.text.TextSearchScope;
+
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.MultiStatus;
+
+import java.io.File;
+import java.util.ArrayList;
+
+/**
+ * Calculates external files in a given scope.
+ */
+public class ExternalFilesOfScopeCalculator {
+
+  private ArrayList<File> files;
+  private final TextSearchScope textSearchScope;
+  private final MultiStatus status;
+
+  public ExternalFilesOfScopeCalculator(TextSearchScope textSearchScope, MultiStatus status) {
+    this.textSearchScope = textSearchScope;
+    this.status = status;
+  }
+
+  public File[] process() {
+    files = new ArrayList<File>();
+    try {
+      for (File root : textSearchScope.getExternalRoots()) {
+        try {
+          if (root.canRead()) {
+            visit(root);
+          }
+        } catch (CoreException ex) {
+          // report and ignore
+          status.add(ex.getStatus());
+        }
+      }
+      return files.toArray(new File[files.size()]);
+    } finally {
+      files = null;
+    }
+  }
+
+  private void visit(File root) throws CoreException {
+    if (root.isDirectory()) {
+      for (File file : root.listFiles()) {
+        visit(file);
+      }
+    } else {
+      files.add(root);
+    }
+  }
+}