diff --git a/native/dicttoolkit/NativeFileList.mk b/native/dicttoolkit/NativeFileList.mk
index 2ba9859..925ec45 100644
--- a/native/dicttoolkit/NativeFileList.mk
+++ b/native/dicttoolkit/NativeFileList.mk
@@ -16,6 +16,12 @@
     dict_toolkit_main.cpp
 
 LATIN_IME_DICT_TOOLKIT_SRC_FILES := \
+    $(addprefix command_executors/, \
+        diff_executor.cpp \
+        header_executor.cpp \
+        help_executor.cpp \
+        info_executor.cpp \
+        makedict_executor.cpp) \
     utils/command_utils.cpp
 
 LATIN_IME_DICT_TOOLKIT_TEST_FILES := \
diff --git a/native/dicttoolkit/dict_toolkit_main.cpp b/native/dicttoolkit/dict_toolkit_main.cpp
index 22db3d4..53cc5e9 100644
--- a/native/dicttoolkit/dict_toolkit_main.cpp
+++ b/native/dicttoolkit/dict_toolkit_main.cpp
@@ -26,15 +26,14 @@
 int main(int argc, char **argv) {
     if (argc < MIN_ARG_COUNT) {
         usage(argc, argv);
-        return 0;
+        return 1;
     }
     using namespace latinime::dicttoolkit;
     const CommandType commandType = CommandUtils::getCommandType(argv[1]);
     if (commandType == CommandType::Unknown) {
         CommandUtils::printCommandUnknownMessage(argv[0], argv[1]);
-        return 0;
+        return 1;
     }
-    // TODO: Implement.
-    fprintf(stderr, "Command '%s' has not been implemented yet.\n", argv[1]);
-    return 0;
+    const auto executor = CommandUtils::getCommandExecutor(commandType);
+    return executor(argc - 1, argv + 1);
 }
diff --git a/native/dicttoolkit/src/command_executors/diff_executor.cpp b/native/dicttoolkit/src/command_executors/diff_executor.cpp
new file mode 100644
index 0000000..1fe90a9
--- /dev/null
+++ b/native/dicttoolkit/src/command_executors/diff_executor.cpp
@@ -0,0 +1,32 @@
+/*
+ * 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.
+ */
+
+#include "command_executors/diff_executor.h"
+
+#include <cstdio>
+
+namespace latinime {
+namespace dicttoolkit {
+
+const char *const DiffExecutor::COMMAND_NAME = "diff";
+
+/* static */ int DiffExecutor::run(const int argc, char **argv) {
+    fprintf(stderr, "Command '%s' has not been implemented yet.\n", COMMAND_NAME);
+    return 0;
+}
+
+} // namespace dicttoolkit
+} // namespace latinime
diff --git a/native/dicttoolkit/src/command_executors/diff_executor.h b/native/dicttoolkit/src/command_executors/diff_executor.h
new file mode 100644
index 0000000..5b4e9e6
--- /dev/null
+++ b/native/dicttoolkit/src/command_executors/diff_executor.h
@@ -0,0 +1,37 @@
+/*
+ * 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 LATINIME_DICT_TOOLKIT_DIFF_EXECUTOR_H
+#define LATINIME_DICT_TOOLKIT_DIFF_EXECUTOR_H
+
+#include "dict_toolkit_defines.h"
+
+namespace latinime {
+namespace dicttoolkit {
+
+class DiffExecutor final {
+ public:
+    static const char *const COMMAND_NAME;
+
+    static int run(const int argc, char **argv);
+
+ private:
+    DISALLOW_IMPLICIT_CONSTRUCTORS(DiffExecutor);
+};
+
+} // namespace dicttoolkit
+} // namepsace latinime
+#endif // LATINIME_DICT_TOOLKIT_DIFF_EXECUTOR_H
diff --git a/native/dicttoolkit/src/command_executors/header_executor.cpp b/native/dicttoolkit/src/command_executors/header_executor.cpp
new file mode 100644
index 0000000..ec2ca81
--- /dev/null
+++ b/native/dicttoolkit/src/command_executors/header_executor.cpp
@@ -0,0 +1,32 @@
+/*
+ * 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.
+ */
+
+#include "command_executors/header_executor.h"
+
+#include <cstdio>
+
+namespace latinime {
+namespace dicttoolkit {
+
+const char *const HeaderExecutor::COMMAND_NAME = "header";
+
+/* static */ int HeaderExecutor::run(const int argc, char **argv) {
+    fprintf(stderr, "Command '%s' has not been implemented yet.\n", COMMAND_NAME);
+    return 0;
+}
+
+} // namespace dicttoolkit
+} // namespace latinime
diff --git a/native/dicttoolkit/src/command_executors/header_executor.h b/native/dicttoolkit/src/command_executors/header_executor.h
new file mode 100644
index 0000000..b482e6b
--- /dev/null
+++ b/native/dicttoolkit/src/command_executors/header_executor.h
@@ -0,0 +1,37 @@
+/*
+ * 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 LATINIME_DICT_TOOLKIT_HEADER_EXECUTOR_H
+#define LATINIME_DICT_TOOLKIT_HEADER_EXECUTOR_H
+
+#include "dict_toolkit_defines.h"
+
+namespace latinime {
+namespace dicttoolkit {
+
+class HeaderExecutor final {
+ public:
+    static const char *const COMMAND_NAME;
+
+    static int run(const int argc, char **argv);
+
+ private:
+    DISALLOW_IMPLICIT_CONSTRUCTORS(HeaderExecutor);
+};
+
+} // namespace dicttoolkit
+} // namepsace latinime
+#endif // LATINIME_DICT_TOOLKIT_HEADER_EXECUTOR_H
diff --git a/native/dicttoolkit/src/command_executors/help_executor.cpp b/native/dicttoolkit/src/command_executors/help_executor.cpp
new file mode 100644
index 0000000..dba9f79
--- /dev/null
+++ b/native/dicttoolkit/src/command_executors/help_executor.cpp
@@ -0,0 +1,32 @@
+/*
+ * 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.
+ */
+
+#include "command_executors/help_executor.h"
+
+#include <cstdio>
+
+namespace latinime {
+namespace dicttoolkit {
+
+const char *const HelpExecutor::COMMAND_NAME = "help";
+
+/* static */ int HelpExecutor::run(const int argc, char **argv) {
+    fprintf(stderr, "Command '%s' has not been implemented yet.\n", COMMAND_NAME);
+    return 0;
+}
+
+} // namespace dicttoolkit
+} // namespace latinime
diff --git a/native/dicttoolkit/src/command_executors/help_executor.h b/native/dicttoolkit/src/command_executors/help_executor.h
new file mode 100644
index 0000000..245fda9
--- /dev/null
+++ b/native/dicttoolkit/src/command_executors/help_executor.h
@@ -0,0 +1,37 @@
+/*
+ * 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 LATINIME_DICT_TOOLKIT_HELP_EXECUTOR_H
+#define LATINIME_DICT_TOOLKIT_HELP_EXECUTOR_H
+
+#include "dict_toolkit_defines.h"
+
+namespace latinime {
+namespace dicttoolkit {
+
+class HelpExecutor final {
+ public:
+    static const char *const COMMAND_NAME;
+
+    static int run(const int argc, char **argv);
+
+ private:
+    DISALLOW_IMPLICIT_CONSTRUCTORS(HelpExecutor);
+};
+
+} // namespace dicttoolkit
+} // namepsace latinime
+#endif // LATINIME_DICT_TOOLKIT_HELP_EXECUTOR_H
diff --git a/native/dicttoolkit/src/command_executors/info_executor.cpp b/native/dicttoolkit/src/command_executors/info_executor.cpp
new file mode 100644
index 0000000..5c9a636
--- /dev/null
+++ b/native/dicttoolkit/src/command_executors/info_executor.cpp
@@ -0,0 +1,32 @@
+/*
+ * 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.
+ */
+
+#include "command_executors/info_executor.h"
+
+#include <cstdio>
+
+namespace latinime {
+namespace dicttoolkit {
+
+const char *const InfoExecutor::COMMAND_NAME = "info";
+
+/* static */ int InfoExecutor::run(const int argc, char **argv) {
+    fprintf(stderr, "Command '%s' has not been implemented yet.\n", COMMAND_NAME);
+    return 0;
+}
+
+} // namespace dicttoolkit
+} // namespace latinime
diff --git a/native/dicttoolkit/src/command_executors/info_executor.h b/native/dicttoolkit/src/command_executors/info_executor.h
new file mode 100644
index 0000000..b42bc0e
--- /dev/null
+++ b/native/dicttoolkit/src/command_executors/info_executor.h
@@ -0,0 +1,37 @@
+/*
+ * 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 LATINIME_DICT_TOOLKIT_INFO_EXECUTOR_H
+#define LATINIME_DICT_TOOLKIT_INFO_EXECUTOR_H
+
+#include "dict_toolkit_defines.h"
+
+namespace latinime {
+namespace dicttoolkit {
+
+class InfoExecutor final {
+ public:
+    static const char *const COMMAND_NAME;
+
+    static int run(const int argc, char **argv);
+
+ private:
+    DISALLOW_IMPLICIT_CONSTRUCTORS(InfoExecutor);
+};
+
+} // namepsace dicttoolkit
+} // namespace latinime
+#endif // LATINIME_DICT_TOOLKIT_INFO_EXECUTOR_H
diff --git a/native/dicttoolkit/src/command_executors/makedict_executor.cpp b/native/dicttoolkit/src/command_executors/makedict_executor.cpp
new file mode 100644
index 0000000..5466a59
--- /dev/null
+++ b/native/dicttoolkit/src/command_executors/makedict_executor.cpp
@@ -0,0 +1,32 @@
+/*
+ * 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.
+ */
+
+#include "command_executors/makedict_executor.h"
+
+#include <cstdio>
+
+namespace latinime {
+namespace dicttoolkit {
+
+const char *const MakedictExecutor::COMMAND_NAME = "makedict";
+
+/* static */ int MakedictExecutor::run(const int argc, char **argv) {
+    fprintf(stderr, "Command '%s' has not been implemented yet.\n", COMMAND_NAME);
+    return 0;
+}
+
+} // namespace dicttoolkit
+} // namespace latinime
diff --git a/native/dicttoolkit/src/command_executors/makedict_executor.h b/native/dicttoolkit/src/command_executors/makedict_executor.h
new file mode 100644
index 0000000..466d1f7
--- /dev/null
+++ b/native/dicttoolkit/src/command_executors/makedict_executor.h
@@ -0,0 +1,37 @@
+/*
+ * 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 LATINIME_DICT_TOOLKIT_MAKEDICT_EXECUTOR_H
+#define LATINIME_DICT_TOOLKIT_MAKEDICT_EXECUTOR_H
+
+#include "dict_toolkit_defines.h"
+
+namespace latinime {
+namespace dicttoolkit {
+
+class MakedictExecutor final {
+ public:
+    static const char *const COMMAND_NAME;
+
+    static int run(const int argc, char **argv);
+
+ private:
+    DISALLOW_IMPLICIT_CONSTRUCTORS(MakedictExecutor);
+};
+
+} // namespace dicttoolkit
+} // namepsace latinime
+#endif // LATINIME_DICT_TOOLKIT_MAKEDICT_EXECUTOR_H
diff --git a/native/dicttoolkit/src/utils/command_utils.cpp b/native/dicttoolkit/src/utils/command_utils.cpp
index 14fd477..3419642 100644
--- a/native/dicttoolkit/src/utils/command_utils.cpp
+++ b/native/dicttoolkit/src/utils/command_utils.cpp
@@ -16,30 +16,59 @@
 
 #include "utils/command_utils.h"
 
+#include <cstdio>
+
+#include "command_executors/diff_executor.h"
+#include "command_executors/header_executor.h"
+#include "command_executors/help_executor.h"
+#include "command_executors/info_executor.h"
+#include "command_executors/makedict_executor.h"
+
 namespace latinime {
 namespace dicttoolkit {
 
-const char *const CommandUtils::COMMAND_NAME_INFO = "info";
-const char *const CommandUtils::COMMAND_NAME_DIFF = "diff";
-const char *const CommandUtils::COMMAND_NAME_MAKEDICT = "makedict";
-const char *const CommandUtils::COMMAND_NAME_HEADER = "header";
-const char *const CommandUtils::COMMAND_NAME_HELP = "help";
-
 /* static */ CommandType CommandUtils::getCommandType(const std::string &commandName) {
-    if (commandName == COMMAND_NAME_INFO) {
+    if (commandName == InfoExecutor::COMMAND_NAME) {
         return CommandType::Info;
-    } else if (commandName == COMMAND_NAME_DIFF) {
+    } else if (commandName == DiffExecutor::COMMAND_NAME) {
         return CommandType::Diff;
-    } else if (commandName == COMMAND_NAME_MAKEDICT) {
+    } else if (commandName == MakedictExecutor::COMMAND_NAME) {
         return CommandType::Makedict;
-    } else if (commandName == COMMAND_NAME_HEADER) {
+    } else if (commandName == HeaderExecutor::COMMAND_NAME) {
         return CommandType::Header;
-    } else if (commandName == COMMAND_NAME_HELP) {
+    } else if (commandName == HelpExecutor::COMMAND_NAME) {
         return CommandType::Help;
     } else {
         return CommandType::Unknown;
     }
 }
 
+/* static */ void CommandUtils::printCommandUnknownMessage(const std::string &programName,
+        const std::string &commandName) {
+    fprintf(stderr, "Command '%s' is unknown. Try '%s %s' for more information.\n",
+            commandName.c_str(), programName.c_str(), HelpExecutor::COMMAND_NAME);
+}
+
+/* static */ std::function<int(int, char **)> CommandUtils::getCommandExecutor(
+        const CommandType commandType) {
+    switch (commandType) {
+        case CommandType::Info:
+            return InfoExecutor::run;
+        case CommandType::Diff:
+            return DiffExecutor::run;
+        case CommandType::Makedict:
+            return MakedictExecutor::run;
+        case CommandType::Header:
+            return HeaderExecutor::run;
+        case CommandType::Help:
+            return HelpExecutor::run;
+        default:
+            return [] (int, char **) -> int {
+                printf("Command executor not found.");
+                return 1;
+            };
+    }
+}
+
 } // namespace dicttoolkit
 } // namespace latinime
diff --git a/native/dicttoolkit/src/utils/command_utils.h b/native/dicttoolkit/src/utils/command_utils.h
index 7df0dd9..4a181f1 100644
--- a/native/dicttoolkit/src/utils/command_utils.h
+++ b/native/dicttoolkit/src/utils/command_utils.h
@@ -17,7 +17,8 @@
 #ifndef LATINIME_DICT_TOOLKIT_COMMAND_UTILS_H
 #define LATINIME_DICT_TOOLKIT_COMMAND_UTILS_H
 
-#include <cstdio>
+#include <functional>
+#include <memory>
 #include <string>
 
 #include "dict_toolkit_defines.h"
@@ -37,21 +38,12 @@
 class CommandUtils {
 public:
     static CommandType getCommandType(const std::string &commandName);
-
     static void printCommandUnknownMessage(const std::string &programName,
-            const std::string &commandName) {
-        fprintf(stderr, "Command '%s' is unknown. Try '%s %s' for more information.\n",
-                commandName.c_str(), programName.c_str(), COMMAND_NAME_HELP);
-    }
+            const std::string &commandName);
+    static std::function<int(int, char **)> getCommandExecutor(const CommandType commandType);
 
 private:
     DISALLOW_IMPLICIT_CONSTRUCTORS(CommandUtils);
-
-    static const char *const COMMAND_NAME_INFO;
-    static const char *const COMMAND_NAME_DIFF;
-    static const char *const COMMAND_NAME_MAKEDICT;
-    static const char *const COMMAND_NAME_HEADER;
-    static const char *const COMMAND_NAME_HELP;
 };
 } // namespace dicttoolkit
 } // namespace latinime