First commit of split-select tool

This tool emits a set of rules as JSON for when a Split APK
should match a target device.

Change-Id: I8bfbdfbdb51efcfc645889dd03e1961f16e39645
diff --git a/tools/split-select/Rule.h b/tools/split-select/Rule.h
new file mode 100644
index 0000000..8029931
--- /dev/null
+++ b/tools/split-select/Rule.h
@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2014 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.
+ */
+
+#ifndef H_ANDROID_SPLIT_RULE
+#define H_ANDROID_SPLIT_RULE
+
+#include "SplitDescription.h"
+
+#include <utils/RefBase.h>
+#include <utils/StrongPointer.h>
+#include <utils/String8.h>
+#include <utils/Vector.h>
+
+namespace split {
+
+struct Rule : public virtual android::RefBase {
+    inline Rule();
+
+    enum Operator {
+        LESS_THAN = 1,
+        GREATER_THAN,
+        EQUALS,
+        CONTAINS_ANY,
+        CONTAINS_ALL,
+        IS_TRUE,
+        IS_FALSE,
+        AND_SUBRULES,
+        OR_SUBRULES,
+        ALWAYS_TRUE,
+    };
+
+    Operator op;
+
+    enum Key {
+        NONE = 0,
+        SDK_VERSION,
+        SCREEN_DENSITY,
+        LANGUAGE,
+        NATIVE_PLATFORM,
+        TOUCH_SCREEN,
+        SCREEN_SIZE,
+        SCREEN_LAYOUT,
+    };
+
+    Key key;
+    bool negate;
+
+    android::Vector<android::String8> stringArgs;
+    android::Vector<int> longArgs;
+    android::Vector<double> doubleArgs;
+    android::Vector<android::sp<Rule> > subrules;
+
+    android::String8 toJson(int indent=0) const;
+
+    static android::sp<Rule> simplify(android::sp<Rule> rule);
+};
+
+Rule::Rule()
+: op(ALWAYS_TRUE)
+, key(NONE)
+, negate(false) {}
+
+} // namespace split
+
+#endif // H_ANDROID_SPLIT_RULE