AAPT2: Refactor flags into commands

Refactors the flag based command invocation into classes that make using
subcommands easier.

Test: manual tests of printing
Change-Id: Ic8df6af0be30db552e32150afebecbfeec7e1075
diff --git a/tools/aapt2/cmd/Convert.h b/tools/aapt2/cmd/Convert.h
new file mode 100644
index 0000000..fcec23d
--- /dev/null
+++ b/tools/aapt2/cmd/Convert.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2018 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 AAPT2_CONVERT_H
+#define AAPT2_CONVERT_H
+
+#include "Command.h"
+#include "format/binary/TableFlattener.h"
+
+namespace aapt {
+
+class ConvertCommand : public Command {
+ public:
+  explicit ConvertCommand() : Command("convert") {
+    SetDescription("Converts an apk between binary and proto formats.");
+    AddRequiredFlag("-o", "Output path", &output_path_);
+    AddOptionalFlag("--output-format", android::base::StringPrintf("Format of the output. "
+            "Accepted values are '%s' and '%s'. When not set, defaults to '%s'.",
+        kOutputFormatProto, kOutputFormatBinary, kOutputFormatBinary), &output_format_);
+    AddOptionalSwitch("--enable-sparse-encoding",
+        "Enables encoding sparse entries using a binary search tree.\n"
+            "This decreases APK size at the cost of resource retrieval performance.",
+        &options_.use_sparse_entries);
+    AddOptionalSwitch("-v", "Enables verbose logging", &verbose_);
+  }
+
+  int Action(const std::vector<std::string>& args) override;
+
+ private:
+  const static char* kOutputFormatProto;
+  const static char* kOutputFormatBinary;
+
+  TableFlattenerOptions options_;
+  std::string output_path_;
+  Maybe<std::string> output_format_;
+  bool verbose_ = false;
+};
+
+}// namespace aapt
+
+#endif //AAPT2_CONVERT_H