feat(baeldung-create-mvn-plugin): initial commit

baeldung-create-mvn-plugin/.gitignore

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+
+# Files
+.classpath
+.externalToolBuilders
+.gradle
+.project
+.pydevproject
+.settings
+.sonar
+*~
+*.ipr
+*.iml
+*.iws
+*.swp
+*.DS_Store
+*.snap.debug
+dependency-reduced-pom.xml
+
+# Directories
+.idea/
+.run/
+.venv/
+_site/
+build/
+dist/
+docs/_build/
+gen-java/
+gen-javabean/
+gen-py/
+node_modules/
+target/

baeldung-create-mvn-plugin/README.md

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+# Overview
+This project shows how to create a Maven plugin.
+
+# Execution
+Call the following instructions to execute the plugin on the command line.
+
+```
+mvn clean install
+mvn de.swingbe:counter-maven-plugin:0.0.1:dependency-counter 
+```
+
+# Links
+[Example](https://www.baeldung.com/maven-plugin)

baeldung-create-mvn-plugin/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xmlns="http://maven.apache.org/POM/4.0.0"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+
+    <!--TODO Compare with mvn_base project!-->
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>de.swingbe</groupId>
+    <artifactId>counter-maven-plugin</artifactId>
+    <packaging>maven-plugin</packaging>
+    <version>0.0.1</version>
+
+    <name>counter-maven-plugin Maven Mojo</name>
+    <url>http://maven.apache.org</url>
+
+    <!--<licenses>
+        <license>
+            <name>GNU General Public License</name>
+            <url>https://www.gnu.org/licenses/gpl-3.0.txt</url>
+        </license>
+    </licenses>-->
+
+    <scm>
+        <!--<url>https://github.com/Software-Ingenieur-Begerad/sandbox-java</url>-->
+    </scm>
+
+    <properties>
+        <maven.compiler.target>1.8</maven.compiler.target>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <!-- Other properties -->
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <dependencies>
+        <!--This plugin contains necessary classes and interfaces to create a MOJO.-->
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.6.3</version>
+        </dependency>
+        <!--This plugin comes in handy to use annotations in our clases.-->
+        <dependency>
+            <groupId>org.apache.maven.plugin-tools</groupId>
+            <artifactId>maven-plugin-annotations</artifactId>
+            <version>3.6.0</version>
+            <scope>provided</scope>
+        </dependency>
+        <!--This plugin lets us access the information about the project where we are including the plugin.-->
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.6.3</version>
+            <scope>compile</scope>
+        </dependency>
+    </dependencies>
+
+</project>

baeldung-create-mvn-plugin/settings.xml

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+<pluginGroups>
+    <pluginGroup>de.swingbe</pluginGroup>
+</pluginGroups>

baeldung-create-mvn-plugin/src/main/java/de/swingbe/counter_mvn_plugin/DependencyCounterMojo.java

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+package de.swingbe.counter_mvn_plugin;
+
+import org.apache.maven.model.Dependency;
+import org.apache.maven.plugin.AbstractMojo;
+import org.apache.maven.plugin.MojoExecutionException;
+import org.apache.maven.plugin.MojoFailureException;
+import org.apache.maven.plugins.annotations.LifecyclePhase;
+import org.apache.maven.plugins.annotations.Mojo;
+import org.apache.maven.plugins.annotations.Parameter;
+import org.apache.maven.project.MavenProject;
+
+import java.util.List;
+
+@Mojo(name = "dependency-counter", defaultPhase = LifecyclePhase.COMPILE)
+public class DependencyCounterMojo extends AbstractMojo {
+
+    @Parameter(defaultValue = "${project}", required = true, readonly = true)
+
+    MavenProject project;
+
+    public void execute() throws MojoExecutionException, MojoFailureException {
+
+        List<Dependency> dependencies = project.getDependencies();
+
+        long numDependencies = dependencies.stream().count();
+
+        getLog().info("Number of dependencies: " + numDependencies);
+
+    }
+}