Adding first maven mojo

2022/01/mojo_demo1/maven_mojo1/.gitignore

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+.idea
+target

2022/01/mojo_demo1/maven_mojo1/pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>ch.polgrabia.demos</groupId>
+  <artifactId>maven_mojo1</artifactId>
+  <packaging>maven-plugin</packaging>
+  <version>0.0.1-SNAPSHOT</version>
+  <name>maven_mojo1 Maven Mojo</name>
+  <url>http://maven.apache.org</url>
+  <properties>
+    <maven.compiler.source>1.8</maven.compiler.source>
+    <maven.compiler.target>1.8</maven.compiler.target>
+  </properties>
+  <dependencies>
+    <dependency>
+      <groupId>org.apache.maven</groupId>
+      <artifactId>maven-plugin-api</artifactId>
+      <version>3.6.3</version>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.maven.plugin-tools</groupId>
+      <artifactId>maven-plugin-annotations</artifactId>
+      <version>3.2</version>
+      <scope>provided</scope>
+    </dependency>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>3.8.1</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+</project>

2022/01/mojo_demo1/maven_mojo1/src/main/java/ch/polgrabia/demos/MyMojo.java

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+package ch.polgrabia.demos;
+
+import org.apache.maven.plugin.AbstractMojo;
+import org.apache.maven.plugin.MojoExecutionException;
+import org.apache.maven.plugin.logging.Log;
+import org.apache.maven.plugins.annotations.LifecyclePhase;
+import org.apache.maven.plugins.annotations.Mojo;
+import org.apache.maven.plugins.annotations.Parameter;
+
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+
+@Mojo(name = "my-mojo", defaultPhase = LifecyclePhase.COMPILE)
+public class MyMojo
+        extends AbstractMojo {
+    private final Log logger = getLog();
+
+    @Parameter(property = "outputDirectory", defaultValue = "target")
+    private File outputDirectory;
+
+    public void execute()
+            throws MojoExecutionException {
+        logger.info("Starting execution...");
+        File f = outputDirectory;
+
+        if (!f.exists()) {
+            if (!f.mkdirs()) {
+                throw new MojoExecutionException("Failed to create directory: " + f.getAbsolutePath());
+            }
+        }
+
+        File touch = new File(f, "touch.txt");
+
+        FileWriter w = null;
+        try {
+            w = new FileWriter(touch);
+
+            w.write("touch.txt");
+        } catch (IOException e) {
+            throw new MojoExecutionException("Error creating file " + touch, e);
+        } finally {
+            if (w != null) {
+                try {
+                    w.close();
+                } catch (IOException e) {
+                    logger.error("I couldn't close it the file", e);
+                }
+            }
+            logger.info("Ending execution...");
+        }
+    }
+}