#663 - pass arguments via command line

BudgetMasterDatabaseMigrator/pom.xml

@@ -13,6 +13,7 @@
 
     <properties>
         <h2database.version>1.4.199</h2database.version>
+        <commons-cli.version>1.5.0</commons-cli.version>
     </properties>
 
     <dependencies>
@@ -45,6 +46,12 @@
             <groupId>org.projectlombok</groupId>
             <artifactId>lombok</artifactId>
         </dependency>
+
+        <dependency>
+            <groupId>commons-cli</groupId>
+            <artifactId>commons-cli</artifactId>
+            <version>${commons-cli.version}</version>
+        </dependency>
     </dependencies>
 
 </project>
\ No newline at end of file

BudgetMasterDatabaseMigrator/src/main/java/de/deadlocker8/budgetmaster/databasemigrator/CommandLineOptions.java

+package de.deadlocker8.budgetmaster.databasemigrator;
+
+public enum CommandLineOptions
+{
+	SOURCE_URL("spring.datasource.jdbc-url", "source h2 database JDBC url, e.g. jdbc:h2:/C:/Users/Admin/AppData/Roaming/Deadlocker/BudgetMaster/debug/budgetmaster"),
+	DESTINATION_URL("spring.seconddatasource.jdbc-url", "destination postresql database JDBC url, e.g. jdbc:postgresql://localhost:5432/budgetmaster"),
+	DESTINATION_USER_NAME("spring.seconddatasource.username", "destination postresql user name, e.g. budgetmaster"),
+	DESTINATION_PASSWORD("spring.seconddatasource.password", "destination postresql password, e.g. BudgetMaster");
+
+	private final String name;
+	private final String description;
+
+	CommandLineOptions(String name, String description)
+	{
+		this.name = name;
+		this.description = description;
+	}
+
+	public String getName()
+	{
+		return name;
+	}
+
+	public String getDescription()
+	{
+		return description;
+	}
+}

BudgetMasterDatabaseMigrator/src/main/java/de/deadlocker8/budgetmaster/databasemigrator/DatabaseMigratorMain.java

 package de.deadlocker8.budgetmaster.databasemigrator;
 
+import org.apache.commons.cli.*;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.batch.core.Job;
 import org.springframework.batch.core.JobParametersBuilder;
 import org.springframework.batch.core.launch.JobLauncher;
@@ -11,6 +14,8 @@ import org.springframework.boot.autoconfigure.SpringBootApplication;
 @SpringBootApplication
 public class DatabaseMigratorMain implements CommandLineRunner
 {
+	private static final Logger LOGGER = LoggerFactory.getLogger(DatabaseMigratorMain.class);
+
 	private final JobLauncher jobLauncher;
 
 	@Qualifier("migrateJob")
@@ -22,11 +27,44 @@ public class DatabaseMigratorMain implements CommandLineRunner
 		this.migrateJob = migrateJob;
 	}
 
-	public static void main(String[] args)
+	public static void main(String[] args) throws ParseException
+	{
+		final Options commandLineOptions = new Options();
+		for(CommandLineOptions option : CommandLineOptions.values())
+		{
+			commandLineOptions.addRequiredOption(null, option.getName(), true, option.getDescription());
+		}
+
+		showHelpIfRequested(args, commandLineOptions);
+
+		final CommandLineParser parser = new DefaultParser();
+		final CommandLine cmd = parser.parse(commandLineOptions, args);
+
+		for(CommandLineOptions option : CommandLineOptions.values())
 		{
+			LOGGER.debug("{}={}", option.getName(), cmd.getOptionValue(option.getName()));
+		}
+
 		SpringApplication.run(DatabaseMigratorMain.class, args);
 	}
 
+	private static void showHelpIfRequested(String[] args, Options availableCommandLineOptions) throws ParseException
+	{
+		final Options commandLineOptions = new Options();
+		commandLineOptions.addOption("h", "help", false, "Print this help");
+
+		final CommandLineParser parser = new DefaultParser();
+		final CommandLine cmd = parser.parse(commandLineOptions, args, true);
+
+		if(cmd.hasOption("help"))
+		{
+			final HelpFormatter formatter = new HelpFormatter();
+			formatter.setWidth(200);
+			formatter.printHelp("BudgetMasterMigrator", availableCommandLineOptions);
+			System.exit(0);
+		}
+	}
+
 	@Override
 	public void run(String... args) throws Exception
 	{

BudgetMasterDatabaseMigrator/src/main/resources/application.properties

-spring.datasource.jdbc-url=jdbc:h2:/C:/Users/RobertG/AppData/Roaming/Deadlocker/BudgetMaster/debug/budgetmaster
+# commented lines should be passed by command line and are only retained as example
+#spring.datasource.jdbc-url=
 spring.datasource.username=sa
 spring.datasource.password=
 spring.datasource.driver-class-name=org.h2.Driver
 
-spring.seconddatasource.jdbc-url=jdbc:postgresql://localhost:5432/budgetmaster
-spring.seconddatasource.username=budgetmaster
-spring.seconddatasource.password=BudgetMaster
+#spring.seconddatasource.jdbc-url=
+#spring.seconddatasource.username=
+#spring.seconddatasource.password=
 spring.seconddatasource.driver-class-name=org.postgresql.Driver
 
 spring.jpa.database=default