Migrate from deprecated IntelliJ plugin components

Closes gh-219

Author: philwebb

spring-javaformat-intellij/spring-javaformat-intellij-plugin/src/main/java/io/spring/format/formatter/intellij/SpringFormatComponent.java renamed to spring-javaformat-intellij/spring-javaformat-intellij-plugin/src/main/java/io/spring/format/formatter/intellij/SpringFormat.java

@@ -25,11 +25,11 @@
 import com.intellij.ide.util.PropertiesComponent;
 import com.intellij.openapi.application.ApplicationInfo;
 import com.intellij.openapi.application.ApplicationManager;
-import com.intellij.openapi.components.ProjectComponent;
 import com.intellij.openapi.diagnostic.Logger;
 import com.intellij.openapi.extensions.PluginDescriptor;
 import com.intellij.openapi.extensions.PluginId;
 import com.intellij.openapi.project.Project;
+import com.intellij.openapi.util.Disposer;
 import com.intellij.psi.codeStyle.CodeStyleManager;
 import com.intellij.serviceContainer.ComponentManagerImpl;
 import org.picocontainer.MutablePicoContainer;
@@ -42,15 +42,17 @@
 import io.spring.format.formatter.intellij.codestyle.monitor.Trigger.State;
 
 /**
- * {@link ProjectComponent} to add Spring Java Format IntelliJ support.
+ * Spring Java Format IntelliJ support added to a {@link Project}.
  *
  * @author Phillip Webb
  */
-public class SpringFormatComponent implements ProjectComponent {
+public class SpringFormat {
 
 	private static final String CODE_STYLE_MANAGER_KEY = CodeStyleManager.class.getName();
 
-	private static final String ACTIVE_PROPERTY = SpringFormatComponent.class.getName() + ".ACTIVE";
+	private static final String ACTIVE_PROPERTY = SpringFormat.class.getName() + ".ACTIVE";
+
+	private static final Logger logger = Logger.getInstance(SpringFormat.class);
 
 	private final Project project;
 
@@ -60,27 +62,21 @@ public class SpringFormatComponent implements ProjectComponent {
 
 	private Monitors monitors;
 
-	private static final Logger logger = Logger.getInstance(SpringFormatComponent.class);
-
 	private PropertiesComponent properties;
 
-	protected SpringFormatComponent(Project project) {
+	protected SpringFormat(Project project) {
 		this.project = project;
 		this.statusIndicator = new StatusIndicator(project);
 		this.properties = PropertiesComponent.getInstance(project);
-	}
-
-	@Override
-	public void initComponent() {
 		if (this.properties.getBoolean(ACTIVE_PROPERTY, false)) {
 			update(State.ACTIVE);
 		}
 		this.monitors = new Monitors(this.project, this::update, FileMonitor.factory(), MavenMonitor.factory(),
 				GradleMonitor.factory());
+		Disposer.register(project, this::dispose);
 	}
 
-	@Override
-	public void disposeComponent() {
+	private void dispose() {
 		if (this.monitors != null) {
 			this.monitors.stop();
 			this.monitors = null;
@@ -158,4 +154,5 @@ private void invokeRegisterServiceInstanceMethod(CodeStyleManager manager, IdeaP
 			throw new IllegalStateException(ex);
 		}
 	}
+
 }

spring-javaformat-intellij/spring-javaformat-intellij-plugin/src/main/java/io/spring/format/formatter/intellij/SpringFormatStartupActivity.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2017-2020 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.format.formatter.intellij;
+
+import com.intellij.openapi.project.Project;
+import com.intellij.openapi.startup.StartupActivity;
+
+/**
+ * {@link StartupActivity} hook for {@link SpringFormat}.
+ *
+ * @author Phillip Webb
+ */
+public class SpringFormatStartupActivity implements StartupActivity {
+
+	@Override
+	public void runActivity(Project project) {
+		new SpringFormat(project);
+	}
+
+}

spring-javaformat-intellij/spring-javaformat-intellij-plugin/src/main/resources/META-INF/plugin.xml

@@ -8,10 +8,7 @@
 	<vendor url="https://spring.io">Spring Team</vendor>
 	<depends>org.jetbrains.idea.maven</depends>
 	<depends>org.jetbrains.plugins.gradle</depends>
-	<project-components>
-		<component>
-			<implementation-class>io.spring.format.formatter.intellij.SpringFormatComponent</implementation-class>
-			<loadForDefaultProject/>
-		</component>
-	</project-components>
+	<extensions defaultExtensionNs="com.intellij">
+		<postStartupActivity implementation="io.spring.format.formatter.intellij.SpringFormatStartupActivity" />
+	</extensions>
 </idea-plugin>