auto import from //depot/cupcake/@135843
diff --git a/tools/idegen/src/IntelliJ.java b/tools/idegen/src/IntelliJ.java
new file mode 100644
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+++ b/tools/idegen/src/IntelliJ.java
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * 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.
+ */
+
+import java.io.File;
+import java.io.IOException;
+import java.util.SortedSet;
+
+/**
+ * Generates an IntelliJ project.
+ */
+public class IntelliJ {
+
+    private static final String IDEA_IML = "android.iml";
+    private static final String IDEA_IPR = "android.ipr";
+
+    /**
+     * Generates IntelliJ configuration files from the given configuration.
+     */
+    public static void generateFrom(Configuration c) throws IOException {
+        File templatesDirectory = new File(c.toolDirectory, "templates");
+        String ipr = Files.toString(new File(templatesDirectory, IDEA_IPR));
+        Files.toFile(ipr, new File(IDEA_IPR));
+
+        String iml = Files.toString(new File(templatesDirectory, IDEA_IML));
+
+        StringBuilder sourceRootsXml = new StringBuilder();
+        for (File sourceRoot : c.sourceRoots) {
+            sourceRootsXml.append("<sourceFolder url=\"file://$MODULE_DIR$/")
+                .append(sourceRoot.getPath())
+                .append("\" isTestSource=\"").append(isTests(sourceRoot))
+                .append("\"/>\n");
+        }
+
+        /*
+         * IntelliJ excludes are module-wide. We explicitly exclude directories
+         * under source roots but leave the rest in so you can still pull
+         * up random non-Java files.
+         */
+        StringBuilder excludeXml = new StringBuilder();
+        for (File excludedDir : c.excludesUnderSourceRoots()) {
+            sourceRootsXml.append("<excludeFolder url=\"file://$MODULE_DIR$/")
+                .append(excludedDir.getPath())
+                .append("\"/>\n");
+        }
+
+        // Exclude Eclipse's output directory.
+        sourceRootsXml.append("<excludeFolder "
+                + "url=\"file://$MODULE_DIR$/out/eclipse\"/>\n");
+
+        StringBuilder jarsXml = new StringBuilder();
+        for (File jar : c.jarFiles) {
+            jarsXml.append("<orderEntry type=\"module-library\">"
+                    + "<library><CLASSES><root url=\"jar://$MODULE_DIR$/")
+                .append(jar.getPath())
+            .append("!/\"/></CLASSES><JAVADOC/><SOURCES/></library>"
+                    + "</orderEntry>\n");
+        }
+
+        iml = iml.replace("SOURCE_FOLDERS",
+                sourceRootsXml.toString() + excludeXml.toString());
+        iml = iml.replace("JAR_ENTRIES", jarsXml.toString());
+
+        Files.toFile(iml, new File(IDEA_IML));
+    }
+
+    private static boolean isTests(File file) {
+        String path = file.getPath();
+
+        // test-runner is testing infrastructure, not test code.
+        if (path.contains("test-runner")) {
+            return false;
+        }
+
+        return path.toUpperCase().contains("TEST");
+    }
+}
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