Add ApplicationYamlPropertiesContributor

Author: YangSiJun528

initializr-generator-spring/src/main/java/io/spring/initializr/generator/spring/properties/ApplicationProperties.java

@@ -73,6 +73,10 @@ void writeTo(PrintWriter writer) {
 		}
 	}
 
+	void writeToYaml(PrintWriter writer) {
+		// TODO: Impl
+	}
+
 	private void add(String key, Object value) {
 		Assert.state(!this.properties.containsKey(key), () -> "Property '%s' already exists".formatted(key));
 		this.properties.put(key, value);

initializr-generator-spring/src/main/java/io/spring/initializr/generator/spring/properties/ApplicationPropertiesProjectGenerationConfiguration.java

@@ -16,6 +16,9 @@
 
 package io.spring.initializr.generator.spring.properties;
 
+import io.spring.initializr.generator.condition.ConditionalOnConfigurationFileFormat;
+import io.spring.initializr.generator.configuration.format.properties.PropertiesFormat;
+import io.spring.initializr.generator.configuration.format.yaml.YamlFormat;
 import io.spring.initializr.generator.project.ProjectGenerationConfiguration;
 
 import org.springframework.beans.factory.ObjectProvider;
@@ -37,8 +40,16 @@ ApplicationProperties applicationProperties(ObjectProvider<ApplicationProperties
 	}
 
 	@Bean
+	@ConditionalOnConfigurationFileFormat(PropertiesFormat.ID)
 	ApplicationPropertiesContributor applicationPropertiesContributor(ApplicationProperties applicationProperties) {
 		return new ApplicationPropertiesContributor(applicationProperties);
 	}
 
+	@Bean
+	@ConditionalOnConfigurationFileFormat(YamlFormat.ID)
+	ApplicationYamlPropertiesContributor applicationYamlPropertiesContributor(
+			ApplicationProperties applicationProperties) {
+		return new ApplicationYamlPropertiesContributor(applicationProperties);
+	}
+
 }

initializr-generator-spring/src/main/java/io/spring/initializr/generator/spring/properties/ApplicationYamlPropertiesContributor.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright 2012 - present the original author or authors.
+ *
+ * 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
+ *
+ *      https://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.
+ */
+
+package io.spring.initializr.generator.spring.properties;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.StandardOpenOption;
+
+import io.spring.initializr.generator.project.contributor.ProjectContributor;
+
+/**
+ * A {@link ProjectContributor} that contributes a {@code application.yml} file to a
+ * project.
+ *
+ * @author Sijun Yang
+ */
+public class ApplicationYamlPropertiesContributor implements ProjectContributor {
+
+	private static final String FILE = "src/main/resources/application.yml";
+
+	private final ApplicationProperties properties;
+
+	public ApplicationYamlPropertiesContributor(ApplicationProperties properties) {
+		this.properties = properties;
+	}
+
+	@Override
+	public void contribute(Path projectRoot) throws IOException {
+		Path output = projectRoot.resolve(FILE);
+		if (!Files.exists(output)) {
+			Files.createDirectories(output.getParent());
+			Files.createFile(output);
+		}
+		try (PrintWriter writer = new PrintWriter(Files.newOutputStream(output, StandardOpenOption.APPEND), false,
+				StandardCharsets.UTF_8)) {
+			this.properties.writeToYaml(writer);
+		}
+	}
+
+}