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diff --git a/src/java/org/anarres/cpp/VirtualFile.java b/src/java/org/anarres/cpp/VirtualFile.java
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+++ b/src/java/org/anarres/cpp/VirtualFile.java
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+/*
+ * Anarres C Preprocessor
+ * Copyright (c) 2007-2008, Shevek
+ *
+ * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+ *
+ * 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 org.anarres.cpp;
+
+import java.io.IOException;
+
+/**
+ * An extremely lightweight virtual file interface.
+ */
+public interface VirtualFile {
+	// public String getParent();
+	public boolean isFile();
+	public String getPath();
+	public String getName();
+	public VirtualFile getParentFile();
+	public VirtualFile getChildFile(String name);
+	public Source getSource() throws IOException;
+}