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   *  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
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   *
   *    https://www.apache.org/licenses/LICENSE-2.0
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  package org.apache.cayenne.access.dbsync;
  
  import org.apache.cayenne.CayenneRuntimeException;
  import org.apache.cayenne.access.DataNode;
  import org.apache.cayenne.map.DbEntity;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.sql.Connection;
  import java.sql.DatabaseMetaData;
  import java.sql.ResultSet;
  import java.sql.SQLException;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.List;
  
  /**
   * @since 3.0
   */
  public class ThrowOnPartialSchemaStrategy extends BaseSchemaUpdateStrategy {
  
      private final static Logger LOGGER = LoggerFactory.getLogger(ThrowOnPartialSchemaStrategy.class);
  
  
      @Override
      protected void processSchemaUpdate(DataNode dataNode) throws SQLException {
  
          SchemaAnalyzer analyzer = new SchemaAnalyzer();
  
          List<String> schemas = new ArrayList<>();
          DatabaseMetaData md = null;
          try {
  
              try (Connection connection = dataNode.getDataSource().getConnection();) {
                  md = connection.getMetaData();
  
                  try (ResultSet rs = md.getSchemas();) {
                      while (rs.next()) {
                          String schemaName = rs.getString(1);
                          schemas.add(schemaName);
                      }
                  }
              }
  
              analyzer.analyzeSchemas(schemas, md);
          } catch (Exception e) {
              LOGGER.debug("Exception analyzing schema, ignoring", e);
          }
  
          Collection<DbEntity> entities = dataNode.getEntityResolver().getDbEntities();
  
          boolean isIncluded = analyzer.compareTables(md, entities);
  
          if (isIncluded && analyzer.getErrorMessage() == null) {
              try {
                  analyzer.compareColumns(md);
              } catch (SQLException e) {
                  LOGGER.debug("Exception analyzing schema, ignoring", e);
              }
          }
  
          processSchemaUpdate(dataNode, analyzer.getTableNoInDB(), analyzer.getErrorMessage(), entities.size());
      }
  
      protected void processSchemaUpdate(DataNode dataNode, List<String> mergerOnlyTable, String errorMessage, int entitiesSize)
              throws SQLException {
  
          if (mergerOnlyTable.size() == 0 && errorMessage == null) {
              LOGGER.info("Full schema is present");
          } else {
              LOGGER.info("Error - missing or partial schema detected");
              StringBuilder buffer = new StringBuilder("Schema mismatch detected");
  
              if (errorMessage != null) {
                  buffer.append(": ").append(errorMessage);
              } else if (mergerOnlyTable.size() == entitiesSize) {
                  buffer.append(": no schema found");
              } else {
                  if (mergerOnlyTable.size() > 0) {
                      buffer.append(": missing table '").append(mergerOnlyTable.get(0)).append('\'');
                  }
              }
  
              throw new CayenneRuntimeException(buffer.toString());
          }
      }
  }
  