Add support for building split APKs

Build multiple APKs, each containing a disjoint subset
of configurations. These can then be loaded into the device
AssetManager and should operate as if they were never split.

Use the idea of building multiple sets of files, where each
set represents an APK. An ApkBuilder can place files
in a set based on its configuration, but you can actually
add directly to a set, in the case of the resources.arsc and
generated AndroidManifest.xml for splits.

Change-Id: Ic65d3f0ac1bbd290185695b9971d425c85ab1de3
diff --git a/tools/aapt/OutputSet.h b/tools/aapt/OutputSet.h
new file mode 100644
index 0000000..ea9ef70
--- /dev/null
+++ b/tools/aapt/OutputSet.h
@@ -0,0 +1,56 @@
+/*
+ * 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 __OUTPUT_SET_H
+#define __OUTPUT_SET_H
+
+#include <set>
+#include <utils/Errors.h>
+#include <utils/String8.h>
+#include <utils/StrongPointer.h>
+
+class AaptFile;
+
+class OutputEntry {
+public:
+    OutputEntry() {}
+    OutputEntry(const android::String8& path, const android::sp<const AaptFile>& file)
+        : mPath(path), mFile(file) {}
+
+    inline const android::sp<const AaptFile>& getFile() const {
+        return mFile;
+    }
+
+    inline const android::String8& getPath() const {
+        return mPath;
+    }
+
+    bool operator<(const OutputEntry& o) const { return getPath() < o.mPath; }
+    bool operator==(const OutputEntry& o) const { return getPath() == o.mPath; }
+
+private:
+    android::String8 mPath;
+    android::sp<const AaptFile> mFile;
+};
+
+class OutputSet : public virtual android::RefBase {
+public:
+    virtual const std::set<OutputEntry>& getEntries() const = 0;
+
+    virtual ~OutputSet() {}
+};
+
+#endif // __OUTPUT_SET_H