content: /*****************************************************************
   *   Licensed to the Apache Software Foundation (ASF) under one
   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you 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
   *
   *    https://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.
   ****************************************************************/
  
  package org.apache.cayenne.dbsync.reverse.dbload;
  
  import java.sql.DatabaseMetaData;
  import java.sql.ResultSet;
  import java.sql.SQLException;
  
  import org.apache.cayenne.dba.DbAdapter;
  import org.apache.cayenne.dbsync.reverse.filters.CatalogFilter;
  import org.apache.cayenne.dbsync.reverse.filters.PatternFilter;
  import org.apache.cayenne.dbsync.reverse.filters.SchemaFilter;
  import org.apache.cayenne.map.DbEntity;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  class AttributeLoader extends PerCatalogAndSchemaLoader {
  
      private static final Logger LOGGER = LoggerFactory.getLogger(DbLoader.class);
  
      private final AttributeProcessor attributeProcessor;
  
      AttributeLoader(DbAdapter adapter, DbLoaderConfiguration config, DbLoaderDelegate delegate) {
          super(adapter, config, delegate);
          attributeProcessor = new AttributeProcessor(adapter);
      }
  
      protected ResultSet getResultSet(String catalogName, String schemaName, DatabaseMetaData metaData) throws SQLException {
          return metaData.getColumns(catalogName, schemaName, WILDCARD, WILDCARD);
      }
  
      @Override
      boolean catchException(String catalogName, String schemaName, SQLException ex) {
          String message = "Unable to load columns for the "
                  + catalogName + "/" + schemaName + ", falling back to per-entity loader.";
          LOGGER.warn(message, ex);
          return true;
      }
  
      @Override
      protected void processResultSetRow(CatalogFilter catalog, SchemaFilter schema, DbLoadDataStore map, ResultSet rs) throws SQLException {
          // for a reason not quiet apparent to me, Oracle sometimes
          // returns duplicate record sets for the same table, messing up
          // table names. E.g. for the system table "WK$_ATTR_MAPPING" columns
          // are returned twice - as "WK$_ATTR_MAPPING" and "WK$$_ATTR_MAPPING"...
          // Go figure
          String tableName = rs.getString("TABLE_NAME");
          DbEntity entity = map.getDbEntity(tableName);
          if(entity == null) {
              return;
          }
  
          PatternFilter columnFilter = schema.tables.getIncludeTableColumnFilter(tableName);
  
          attributeProcessor.processAttribute(rs, columnFilter, entity);
      }
  }
  