package org.apache.ojb.broker.ant;
   
   /* Copyright 2005 The Apache Software Foundation
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.Properties;
  
  import org.apache.ddlutils.io.DatabaseIO;
  import org.apache.ddlutils.model.Database;
  import org.apache.ddlutils.task.DatabaseTaskBase;
  import org.apache.ojb.broker.PBKey;
  import org.apache.ojb.broker.metadata.DescriptorRepository;
  import org.apache.ojb.broker.metadata.JdbcConnectionDescriptor;
  import org.apache.ojb.broker.metadata.MetadataManager;
  import org.apache.ojb.broker.metadata.RepositoryPersistor;
  import org.apache.tools.ant.AntClassLoader;
  import org.apache.tools.ant.BuildException;
  import org.apache.tools.ant.DirectoryScanner;
  import org.apache.tools.ant.Project;
  import org.apache.tools.ant.types.FileSet;
  
  /**
   * Task for inserting data XML that is defined in terms of the repository elements.
   * 
   * @author Thomas Dudziak
   */
  public class RepositoryDataTask extends DatabaseTaskBase
  {
      /** The sub tasks to execute. */
      private ArrayList _commands = new ArrayList();
      /** The alias of the jdbc connection to use (empty = default connection) */
      private String _jcdAlias;
      /** The properties file */
      private File _ojbPropertiesFile;
      /** The repository file */
      private File _repositoryFile;
      /** A single schema file to read. */
      private File _singleSchemaFile = null;
      /** The input files. */
      private ArrayList _fileSets = new ArrayList();
      /** Whether XML input files are validated against the internal or an external DTD. */
      private boolean _useInternalDtd = true;
  
  
      /**
       * Sets the alias of the jdbc connection to use.
       * 
       * @param alias The alias of the connection
       */
      public void setJcdAlias(String alias)
      {
          _jcdAlias = alias;
      }
  
      /**
       * Returns the alias of the jdbc connection.
       * 
       * @return The alias
       */
      public String getJcdAlias()
      {
          return _jcdAlias;
      }
  
      /**
       * Returns the ojb properties file, per default 'OJB.properties' in the current directory.
       * 
       * @return The ojb properties file
       */
      public File getOjbPropertiesFile()
      {
          return _ojbPropertiesFile;
      }
      /**
       * Sets the ojb properties file.
       *
       * @param ojbPropertiesFile The ojb properties file
       */
      public void setOjbPropertiesFile(File ojbPropertiesFile)
      {
          _ojbPropertiesFile = ojbPropertiesFile;
      }
  
     /**
      * Returns the repository file.
      * 
      * @return The repository file
      */
     public File getRepositoryFile()
     {
         return _repositoryFile;
     }
 
     /**
      * Sets the repository file (per default the one configured in the ojb properties file is used).
      * 
      * @param file The repository file
      */
     public void setRepositoryFile(File file)
     {
         _repositoryFile = file;
     }
 
     /**
      * Specifies whether XML schema files are validated against the internal or an external DTD.
      *
      * @param useInternalDtd <code>true</code> if input files are to be validated against the internal DTD
      */
     public void setUseInternalDtd(boolean useInternalDtd)
     {
         _useInternalDtd = useInternalDtd;
     }
 
     /**
      * Adds a fileset specifying the schema files.
      * 
      * @param fileset The additional input files
      */
     public void addConfiguredFileset(FileSet fileset)
     {
         _fileSets.add(fileset);
     }
 
     /**
      * Set the xml schema describing the application model.
      *
      * @param schemaFile The schema
      */
     public void setSchemaFile(File schemaFile)
     {
         _singleSchemaFile = schemaFile;
     }
 
     /**
      * Adds the "write dtd to file"-command.
      * 
      * @param command The command
      */
     public void addWriteDtdToFile(WriteDtdToFileCommand command)
     {
         _commands.add(command);
     }
 
     /**
      * Adds the "write data to database"-command.
      * 
      * @param command The command
      */
     public void addWriteDataToDatabase(WriteDataToDatabaseCommand command)
     {
         _commands.add(command);
     }
 
     /**
      * Adds the "write data sql to file"-command.
      * 
      * @param command The command
      */
     public void addWriteDataSqlToFile(WriteDataSqlToFileCommand command)
     {
         _commands.add(command);
     }
 
     /**
      * {@inheritDoc}
      */
     protected Database readModel()
     {
         DatabaseIO reader = new DatabaseIO();
         Database   model  = null;
 
         reader.setUseInternalDtd(_useInternalDtd);
         if ((_singleSchemaFile != null) && !_fileSets.isEmpty())
         {
             throw new BuildException("Please use either the schemafile attribute or the sub fileset element, but not both");
         }
         if (_singleSchemaFile != null)
         {
             model = readSingleSchemaFile(reader, _singleSchemaFile);
         }
         else
         {
             for (Iterator it = _fileSets.iterator(); it.hasNext();)
             {
                 FileSet          fileSet    = (FileSet)it.next();
                 File             fileSetDir = fileSet.getDir(getProject());
                 DirectoryScanner scanner    = fileSet.getDirectoryScanner(getProject());
                 String[]         files      = scanner.getIncludedFiles();
     
                 for (int idx = 0; (files != null) && (idx < files.length); idx++)
                 {
                     Database curModel = readSingleSchemaFile(reader, new File(fileSetDir, files[idx]));
     
                     if (model == null)
                     {
                         model = curModel;
                     }
                     else if (curModel != null)
                     {
                         try
                         {
                             model.mergeWith(curModel);
                         }
                         catch (IllegalArgumentException ex)
                         {
                             throw new BuildException("Could not merge with schema from file "+files[idx]+": "+ex.getLocalizedMessage(), ex);
                         }
                     }
                 }
             }
         }
         return model;
     }
 
     /**
      * Reads a single schema file.
      * 
      * @param reader     The schema reader 
      * @param schemaFile The schema file
      * @return The model
      */
     private Database readSingleSchemaFile(DatabaseIO reader, File schemaFile)
     {
         Database model = null;
 
         if (!schemaFile.isFile())
         {
             log("Path "+schemaFile.getAbsolutePath()+" does not denote a schema file", Project.MSG_ERR);
         }
         else if (!schemaFile.canRead())
         {
             log("Could not read schema file "+schemaFile.getAbsolutePath(), Project.MSG_ERR);
         }
         else
         {
             try
             {
                 model = reader.read(schemaFile);
                 log("Read schema file "+schemaFile.getAbsolutePath(), Project.MSG_INFO);
             }
             catch (Exception ex)
             {
                 throw new BuildException("Could not read schema file "+schemaFile.getAbsolutePath()+": "+ex.getLocalizedMessage(), ex);
             }
         }
         return model;
     }
 
     /**
      * Initializes OJB for the purposes of this task.
      * 
      * @return The metadata manager used by OJB
      */
     private MetadataManager initOJB()
     {
         try
         {
             if (_ojbPropertiesFile == null)
             {
                 _ojbPropertiesFile = new File("OJB.properties");
                 if (!_ojbPropertiesFile.exists())
                 {
                     throw new BuildException("Could not find OJB.properties, please specify it via the ojbpropertiesfile attribute");
                 }
             }
             else
             {
                 if (!_ojbPropertiesFile.exists())
                 {
                     throw new BuildException("Could not load the specified OJB properties file "+_ojbPropertiesFile);
                 }
                 log("Using properties file "+_ojbPropertiesFile.getAbsolutePath(), Project.MSG_INFO);
                 System.setProperty("OJB.properties", _ojbPropertiesFile.getAbsolutePath());
             }
 
             MetadataManager     metadataManager = MetadataManager.getInstance();
             RepositoryPersistor persistor       = new RepositoryPersistor();
 
             if (_repositoryFile != null)
             {
                 if (!_repositoryFile.exists())
                 {
                     throw new BuildException("Could not load the specified repository file "+_repositoryFile);
                 }
                 log("Loading repository file "+_repositoryFile.getAbsolutePath(), Project.MSG_INFO);
 
                 // this will load the info from the specified repository file
                 // and merge it with the existing info (if it has been loaded)
                 metadataManager.mergeConnectionRepository(persistor.readConnectionRepository(_repositoryFile.getAbsolutePath()));
                 metadataManager.mergeDescriptorRepository(persistor.readDescriptorRepository(_repositoryFile.getAbsolutePath()));
             }
             else if (metadataManager.connectionRepository().getAllDescriptor().isEmpty() &&
                      metadataManager.getGlobalRepository().getDescriptorTable().isEmpty())
             {
                 // Seems nothing was loaded, probably because we're not starting in the directory
                 // that the properties file is in, and the repository file path is relative
                 // So lets try to resolve this path and load the repository info manually
                 Properties props = new Properties();
 
                 props.load(new FileInputStream(_ojbPropertiesFile));
     
                 String repositoryPath = props.getProperty("repositoryFile", "repository.xml");
                 File   repositoryFile = new File(repositoryPath);
     
                 if (!repositoryFile.exists())
                 {
                     repositoryFile = new File(_ojbPropertiesFile.getParentFile(), repositoryPath);
                 }
                 metadataManager.mergeConnectionRepository(persistor.readConnectionRepository(repositoryFile.getAbsolutePath()));
                 metadataManager.mergeDescriptorRepository(persistor.readDescriptorRepository(repositoryFile.getAbsolutePath()));
             }
             // we might have to determine the default pb key ourselves
             if (metadataManager.getDefaultPBKey() == null)
             {
                 for (Iterator it = metadataManager.connectionRepository().getAllDescriptor().iterator(); it.hasNext();)
                 {
                     JdbcConnectionDescriptor descriptor = (JdbcConnectionDescriptor)it.next();
 
                     if (descriptor.isDefaultConnection())
                     {
                         metadataManager.setDefaultPBKey(new PBKey(descriptor.getJcdAlias(), descriptor.getUserName(), descriptor.getPassWord()));
                         break;
                     }
                 }
             }
             return metadataManager;
         }
         catch (Exception ex)
         {
             if (ex instanceof BuildException)
             {
                 throw (BuildException)ex;
             }
             else
             {
                 throw new BuildException(ex);
             }
         }
     }
 
     /**
      * {@inheritDoc}
      */
     public void execute() throws BuildException
     {
         if (_commands.isEmpty())
         {
             log("No sub tasks specified, so there is nothing to do.", Project.MSG_INFO);
             return;
         }
 
         ClassLoader    sysClassLoader = Thread.currentThread().getContextClassLoader();
         AntClassLoader newClassLoader = new AntClassLoader(getClass().getClassLoader(), true);
 
         // we're changing the thread classloader so that we can access resources
         // from the classpath used to load this task's class
         Thread.currentThread().setContextClassLoader(newClassLoader);
         
         try
         {
             MetadataManager      manager  = initOJB();
             Database             dbModel  = readModel();
             DescriptorRepository objModel = manager.getGlobalRepository();
 
             if (dbModel == null)
             {
                 throw new BuildException("No database model specified");
             }
             for (Iterator it = _commands.iterator(); it.hasNext();)
             {
                 Command cmd = (Command)it.next();
 
                 cmd.setPlatform(getPlatform());
                 cmd.execute(this, dbModel, objModel);
             }
         }
         finally
         {
             // rollback of our classloader change
             Thread.currentThread().setContextClassLoader(sysClassLoader);
         }
     }
 }