fix mapping of html files to libraries http://code.google.com/p/dart/issues/detail?id=3586

editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/utilities/resource/IResourceUtilities.java

Index: editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/utilities/resource/IResourceUtilities.java
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--- editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/utilities/resource/IResourceUtilities.java	(revision 0)
+++ editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/utilities/resource/IResourceUtilities.java	(revision 0)
@@ -0,0 +1,51 @@
+/*
+ * 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.core.utilities.resource;
+
+import com.google.dart.tools.core.internal.util.ResourceUtil;
+import com.google.dart.tools.core.model.DartModelException;
+
+import org.eclipse.core.resources.IFile;
+import org.eclipse.core.resources.IResource;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * The class <code>IResourceUtilities</code> defines utility methods used to work with resources.
+ */
+public final class IResourceUtilities {
+
+  /**
+   * Given a list of file names, resolves them against the given resource and returns a list of file
+   * paths
+   * 
+   * @param resource used to resolve the paths
+   * @param fileNames list of file names to resolve
+   * @return list of resolved file paths
+   * @throws DartModelException
+   */
+  public static List<String> getResolvedFilePaths(IResource resource, List<String> fileNames)
+      throws DartModelException {
+    List<String> filePaths = new ArrayList<String>();
+    for (String name : fileNames) {
+      IFile file = ResourceUtil.getFile(resource.getLocationURI().resolve(name));
+      if (file != null) {
+        filePaths.add(file.getLocation().toPortableString());
+      }
+    }
+    return filePaths;
+  }
+
+}