aconfig: Add codegen for java
Add codegen for java skeleton
Bug: 279485059
Test: atest aconfig.test
Change-Id: Ia0481cec9c2e137e88e9a77d1b82412529b64adc
diff --git a/tools/aconfig/src/codegen_java.rs b/tools/aconfig/src/codegen_java.rs
new file mode 100644
index 0000000..9d52cce
--- /dev/null
+++ b/tools/aconfig/src/codegen_java.rs
@@ -0,0 +1,142 @@
+/*
+ * Copyright (C) 2023 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.
+ */
+
+use anyhow::Result;
+use serde::Serialize;
+use tinytemplate::TinyTemplate;
+
+use crate::aconfig::{FlagState, Permission};
+use crate::cache::{Cache, Item};
+
+pub struct GeneratedFile {
+ pub file_content: String,
+ pub file_name: String,
+}
+
+pub fn generate_java_code(cache: &Cache) -> Result<GeneratedFile> {
+ let class_elements: Vec<ClassElement> = cache.iter().map(create_class_element).collect();
+ let readwrite = class_elements.iter().any(|item| item.readwrite);
+ let namespace = uppercase_first_letter(
+ cache.iter().find(|item| !item.namespace.is_empty()).unwrap().namespace.as_str(),
+ );
+ let context = Context { namespace: namespace.clone(), readwrite, class_elements };
+ let mut template = TinyTemplate::new();
+ template.add_template("java_code_gen", include_str!("../templates/java.template"))?;
+ let file_content = template.render("java_code_gen", &context)?;
+ Ok(GeneratedFile { file_content, file_name: format!("{}.java", namespace) })
+}
+
+#[derive(Serialize)]
+struct Context {
+ pub namespace: String,
+ pub readwrite: bool,
+ pub class_elements: Vec<ClassElement>,
+}
+
+#[derive(Serialize)]
+struct ClassElement {
+ pub method_name: String,
+ pub readwrite: bool,
+ pub default_value: String,
+ pub feature_name: String,
+ pub flag_name: String,
+}
+
+fn create_class_element(item: &Item) -> ClassElement {
+ ClassElement {
+ method_name: item.name.clone(),
+ readwrite: item.permission == Permission::ReadWrite,
+ default_value: if item.state == FlagState::Enabled {
+ "true".to_string()
+ } else {
+ "false".to_string()
+ },
+ feature_name: item.name.clone(),
+ flag_name: item.name.clone(),
+ }
+}
+
+fn uppercase_first_letter(s: &str) -> String {
+ s.chars()
+ .enumerate()
+ .map(
+ |(index, ch)| {
+ if index == 0 {
+ ch.to_ascii_uppercase()
+ } else {
+ ch.to_ascii_lowercase()
+ }
+ },
+ )
+ .collect()
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+ use crate::aconfig::{Flag, Value};
+ use crate::commands::Source;
+
+ #[test]
+ fn test_generate_java_code() {
+ let namespace = "TeSTFlaG";
+ let mut cache = Cache::new(1, namespace.to_string());
+ cache
+ .add_flag(
+ Source::File("test.txt".to_string()),
+ Flag {
+ name: "test".to_string(),
+ description: "buildtime enable".to_string(),
+ values: vec![Value::default(FlagState::Enabled, Permission::ReadOnly)],
+ },
+ )
+ .unwrap();
+ cache
+ .add_flag(
+ Source::File("test2.txt".to_string()),
+ Flag {
+ name: "test2".to_string(),
+ description: "runtime disable".to_string(),
+ values: vec![Value::default(FlagState::Disabled, Permission::ReadWrite)],
+ },
+ )
+ .unwrap();
+ let expect_content = "package com.android.aconfig;
+
+ import android.provider.DeviceConfig;
+
+ public final class Testflag {
+
+ public static boolean test() {
+ return true;
+ }
+
+ public static boolean test2() {
+ return DeviceConfig.getBoolean(
+ \"Testflag\",
+ \"test2__test2\",
+ false
+ );
+ }
+
+ }
+ ";
+ let expected_file_name = format!("{}.java", uppercase_first_letter(namespace));
+ let generated_file = generate_java_code(&cache).unwrap();
+ assert_eq!(expected_file_name, generated_file.file_name);
+ assert_eq!(expect_content.replace(' ', ""), generated_file.file_content.replace(' ', ""));
+ }
+}