// Version: $Id: $

 // Copyright: Copyright(c) 2007 Trace Financial Limited

 package org.liquibase.maven.plugins;

 import liquibase.Liquibase;

 import liquibase.database.Database;

 import liquibase.exception.LiquibaseException;

 import liquibase.resource.CompositeResourceAccessor;

 import liquibase.resource.FileSystemResourceAccessor;

 import liquibase.resource.ResourceAccessor;

 import org.apache.maven.plugin.MojoExecutionException;

 import org.apache.maven.plugin.MojoFailureException;

 /**

  * A Liquibase MOJO that requires the user to provide a DatabaseChangeLogFile to be able to perform any actions on the

  * database.

  * 

  * @author Peter Murray

  */

 public abstract class AbstractLiquibaseChangeLogMojo extends AbstractLiquibaseMojo {

     /**

      * Specifies the change log file to use for Liquibase.

      * 

      * @parameter expression="${liquibase.changeLogFile}"

      */

     protected String changeLogFile;

     /**

      * The Liquibase contexts to execute, which can be "," separated if multiple contexts are required. If no context is

      * specified then ALL contexts will be executed.

      * 

      * @parameter expression="${liquibase.contexts}" default-value=""

      */

     protected String contexts;

     @Override

     protected void checkRequiredParametersAreSpecified() throws MojoFailureException {

         super.checkRequiredParametersAreSpecified();

         if (changeLogFile == null) {

             throw new MojoFailureException("The changeLogFile must be specified.");

         }

     }

     /**

      * Performs the actual Liquibase task on the database using the fully configured {@link liquibase.Liquibase}.

      * 

      * @param liquibase

      *            The {@link liquibase.Liquibase} that has been fully configured to run the desired database task.

      */

     @Override

     protected void performLiquibaseTask(Liquibase liquibase) throws LiquibaseException {

     }

     @Override

     protected void printSettings(String indent) {

         super.printSettings(indent);

         getLog().info(indent + "changeLogFile: " + changeLogFile);

         getLog().info(indent + "context(s): " + contexts);

     }

     @Override

     protected ResourceAccessor getFileOpener(ClassLoader cl) {

         ResourceAccessor mFO = new MavenResourceAccessor(cl);

         ResourceAccessor fsFO = new FileSystemResourceAccessor(project.getBasedir().getAbsolutePath());

         return new CompositeResourceAccessor(mFO, fsFO);

     }

     @Override

     protected Liquibase createLiquibase(ResourceAccessor fo, Database db) throws MojoExecutionException {

         try {

             String changeLog = changeLogFile == null ? "" : changeLogFile.trim();

             return new Liquibase(changeLog, fo, db);

         } catch (LiquibaseException ex) {

             throw new MojoExecutionException("Error creating liquibase: " + ex.getMessage(), ex);

         }

     }

 }