Add automation of Properties creator in build phase with a maven plugin

Feature to automate the properties file creation;
Created a plugin that can be add in the pom to automatic create properties based on passed args

owner-creator-maven-plugin/pom.xml

@@ -0,0 +1,67 @@
+<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>org.aeonbits.owner</groupId>
+  <artifactId>maven-plugin-owner-creator</artifactId>
+  <packaging>maven-plugin</packaging>
+  <version>1.0.11-SNAPSHOT</version>
+  <name>OWNER :: Plugin</name>
+  <url>http://maven.apache.org</url>
+  <dependencies>
+    <dependency>
+      <groupId>org.apache.maven</groupId>
+      <artifactId>maven-plugin-api</artifactId>
+      <version>3.5.3</version>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.maven.plugin-tools</groupId>
+      <artifactId>maven-plugin-annotations</artifactId>
+      <version>3.5.1</version>
+      <scope>provided</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.maven</groupId>
+      <artifactId>maven-project</artifactId>
+      <version>2.0.8</version>
+    </dependency>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>3.8.1</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+        <groupId>org.aeonbits.owner</groupId>
+        <artifactId>owner</artifactId>
+        <version>1.0.11-SNAPSHOT</version>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.maven</groupId>
+      <artifactId>maven-artifact</artifactId>
+      <version>2.0.8</version>
+    </dependency>
+  </dependencies>
+  <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-plugin-plugin</artifactId>
+                <version>3.2</version>
+                <configuration>
+                    <!-- see http://jira.codehaus.org/browse/MNG-5346 -->
+                    <skipErrorNoDescriptorsFound>true</skipErrorNoDescriptorsFound>
+                </configuration>
+
+                <executions>
+                    <execution>
+                        <id>mojo-descriptor</id>
+                        <goals>
+                            <goal>descriptor</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>

owner-creator-maven-plugin/src/main/java/org/aeonbits/owner/plugin/PropertiesFileCreatorMojo.java

@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2012-2015, Luigi R. Viggiano
+ * All rights reserved.
+ *
+ * This software is distributable under the BSD license.
+ * See the terms of the BSD license in the documentation provided with this software.
+ */
+
+package org.aeonbits.owner.plugin;
+
+import java.io.File;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.util.ArrayList;
+import java.util.List;
+import org.aeonbits.owner.creator.PropertiesFileCreator;
+import org.apache.maven.plugin.AbstractMojo;
+import org.apache.maven.plugin.MojoExecutionException;
+import org.apache.maven.plugin.MojoFailureException;
+import org.apache.maven.plugins.annotations.Component;
+import org.apache.maven.plugins.annotations.Mojo;
+import org.apache.maven.plugins.annotations.Parameter;
+import org.apache.maven.plugins.annotations.ResolutionScope;
+import org.apache.maven.project.MavenProject;
+
+/**
+ *
+ * @author Luca Taddeo
+ */
+
+@Mojo(name = "create", requiresDependencyResolution = ResolutionScope.RUNTIME)
+public class PropertiesFileCreatorMojo 
+    extends AbstractMojo {
+
+    /**
+     * Location of the output properties file.
+     */
+    @Parameter(required=true)
+    private String outputDirectory;
+
+    /**
+     * Config class to parse.
+     */
+    @Parameter(required=true)
+    private String packageClass;
+
+    /**
+     * Jar to include.
+     */
+    @Parameter
+    private String jarPath;
+
+    /**
+     * Project Name.
+     */
+    @Parameter
+    private String projectName;
+
+    /**
+     * Project description.
+     */
+    @Parameter
+    private String projectDesription;
+
+    @Component
+    private MavenProject project;
+
+    @Override
+    public void execute() throws MojoExecutionException, MojoFailureException {
+        try {
+
+            List<URL> urls = new ArrayList();
+
+            if(jarPath != null && !jarPath.isEmpty()) {
+                System.out.println("Use passed jar [" + jarPath + "]");
+                File jar = new File(jarPath);
+                urls.add(jar.toURI().toURL());
+            } else {
+                System.out.println("Use classpath");
+                // Loading project classpath to retrieve class
+                for (Object ele : project.getRuntimeClasspathElements()) {
+                    File jar = new File(ele.toString());
+                    urls.add(jar.toURI().toURL());
+                }
+            }
+
+            URLClassLoader jarPack = new URLClassLoader(urls.toArray(new URL[urls.size()]), this.getClass().getClassLoader());
+            Class classToLoad = jarPack.loadClass(packageClass);
+
+            // Parse class and create property file
+            PropertiesFileCreator creator = new PropertiesFileCreator();
+            creator.parse(classToLoad, outputDirectory, projectName, projectDesription);
+            System.out.println("Conversion succeded, properties saved [" + outputDirectory + "]");
+        } catch (Throwable ex) {
+            throw new MojoExecutionException(ex.getMessage());
+        }
+    }
+
+}

owner/src/main/java/org/aeonbits/owner/Config.java

@@ -115,6 +115,56 @@ public interface Config extends Serializable {
         Class<? extends Decryptor> value() default IdentityDecryptor.class;
     }
 
+    /**
+     * The description that appears in created property file.
+     */
+    @Retention(RUNTIME)
+    @Target(METHOD)
+    @Documented
+    @interface Description {
+        String value();
+    }
+
+    /**
+     * If this annotation is put on a property, it will not write on property file.
+     */
+    @Retention(RUNTIME)
+    @Target(METHOD)
+    @Documented
+    @interface NoProperty {
+    }
+
+    /**
+     * Value to assign to the property in the property file.
+     */
+    @Retention(RUNTIME)
+    @Target(METHOD)
+    @Documented
+    @interface ValorizedAs {
+        String value();
+    }
+
+    /**
+     * Order to follow for groups in property file.
+     */
+    @Retention(RUNTIME)
+    @Target(TYPE)
+    @Documented
+    @interface GroupOrder {
+        String[] value();
+    }
+
+    /**
+     * Group of a property.
+     * Can be more than one as group and subgroup.
+     */
+    @Retention(RUNTIME)
+    @Target(METHOD)
+    @Documented
+    @interface Group {
+        String[] value();
+    }
+
     /**
      * Specifies the policy type to use to load the {@link org.aeonbits.owner.Config.Sources} files for properties.
      *

owner/src/main/java/org/aeonbits/owner/creator/Creator.java

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2012-2015, Luigi R. Viggiano
+ * All rights reserved.
+ *
+ * This software is distributable under the BSD license.
+ * See the terms of the BSD license in the documentation provided with this software.
+ */
+
+package org.aeonbits.owner.creator;
+
+/**
+ * Interface to convert Config class into something else.
+ * 
+ * @author Luca Taddeo
+ */
+public interface Creator {
+    boolean parse(Class clazz, String output, String headerName, String projectName) throws Exception;
+}