Virtual filesystem support for dart_analyzer.

compiler/java/com/google/dart/compiler/SystemLibraryProvider.java

Index: compiler/java/com/google/dart/compiler/SystemLibraryProvider.java
===================================================================
--- compiler/java/com/google/dart/compiler/SystemLibraryProvider.java	(revision 0)
+++ compiler/java/com/google/dart/compiler/SystemLibraryProvider.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.compiler;
+
+import com.google.dart.compiler.SystemLibrariesReader.DartLibrary;
+
+import java.net.URI;
+import java.util.Map;
+
+/**
+ * A provider for System libraries.
+ */
+public interface SystemLibraryProvider {
+
+  /**
+   * Get a URI describing the root of the SDK. 
+   */
+  URI getSdkLibPathUri();
+
+  /**
+   * Get a mapping of symbolic names (e.g., "dart:html") to {@link DartLibrary}s.
+   */
+  Map<String, DartLibrary> getLibraryMap();
+
+  /**
+   * Constructs a new URI by parsing the given host string and then resolving it against this URI.
+   * 
+   * @param host the host string 
+   * @param uri the uri to resolve against
+   * @return the resulting URI
+   */
+  URI resolveHost(String host, URI uri);
+
+  /**
+   * Tests whether the resource denoted by this abstract URI exists.
+   * 
+   * @param uri the URI to test
+   * @return <code>true</code> if and only if the resource denoted by this URI exists; <code>false</code> otherwise
+   */
+  boolean exists(URI uri);
+
+  /**
+   * Define a new system library.
+   * 
+   * @param name the short name of the library
+   * @param host the host
+   * @param pathToLib the path to the library
+   * @param category the library category
+   * @param documented <code>true</code> if documented, <code>false</code> otherwise
+   * @param implementation <code>true</code> if an implementation library, <code>false</code> otherwise
+   * @return the resulting {@link SystemLibrary}
+   */
+  SystemLibrary createSystemLibrary(String name, String host, String pathToLib, String category, boolean documented, boolean implementation);
+
+}