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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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  package org.apache.cayenne.dbsync.merge.factory;
  
  import org.apache.cayenne.dba.DbAdapter;
  import org.apache.cayenne.dba.QuotingStrategy;
  import org.apache.cayenne.dbsync.merge.token.MergerToken;
  import org.apache.cayenne.dbsync.merge.token.db.AddColumnToDb;
  import org.apache.cayenne.dbsync.merge.token.db.SetAllowNullToDb;
  import org.apache.cayenne.dbsync.merge.token.db.SetColumnTypeToDb;
  import org.apache.cayenne.dbsync.merge.token.db.SetGeneratedFlagToDb;
  import org.apache.cayenne.dbsync.merge.token.db.SetNotNullToDb;
  import org.apache.cayenne.map.DbAttribute;
  import org.apache.cayenne.map.DbEntity;
  
  import java.util.Collections;
  import java.util.List;
  
  public class SQLServerMergerTokenFactory extends DefaultMergerTokenFactory {
  
      @Override
      public MergerToken createSetColumnTypeToDb(
              final DbEntity entity,
              DbAttribute columnOriginal,
              final DbAttribute columnNew) {
  
          return new SetColumnTypeToDb(entity, columnOriginal, columnNew) {
  
              @Override
              protected void appendPrefix(StringBuffer sqlBuffer, QuotingStrategy context) {
                  // http://msdn2.microsoft.com/en-us/library/ms190273.aspx
                  sqlBuffer.append("ALTER TABLE ");
                  sqlBuffer.append(context.quotedFullyQualifiedName(entity));
                  sqlBuffer.append(" ALTER COLUMN ");
                  sqlBuffer.append(context.quotedName(columnNew));
                  sqlBuffer.append(" ");
              }
          };
      }
  
      @Override
      public MergerToken createAddColumnToDb(final DbEntity entity, final DbAttribute column) {
          return new AddColumnToDb(entity, column) {
  
              @Override
              protected void appendPrefix(StringBuffer sqlBuffer, QuotingStrategy context) {
                  // http://msdn2.microsoft.com/en-us/library/ms190273.aspx
                  sqlBuffer.append("ALTER TABLE ");
                  sqlBuffer.append(context.quotedFullyQualifiedName(entity));
                  sqlBuffer.append(" ADD ");
                  sqlBuffer.append(context.quotedName(column));
                  sqlBuffer.append(" ");
              }
          };
      }
  
      @Override
      public MergerToken createSetAllowNullToDb(DbEntity entity, final DbAttribute column) {
          return new SetAllowNullToDb(entity, column) {
  
              @Override
              public List<String> createSql(DbAdapter adapter) {
                  StringBuffer sqlBuffer = new StringBuffer();
  
                  sqlBuffer.append("ALTER TABLE ");
                  sqlBuffer.append(adapter.getQuotingStrategy().quotedFullyQualifiedName(getEntity()));
                  sqlBuffer.append(" ALTER COLUMN ");
  
                  adapter.createTableAppendColumn(sqlBuffer, column);
  
                  return Collections.singletonList(sqlBuffer.toString());
              }
  
          };
      }
  
      @Override
      public MergerToken createSetNotNullToDb(DbEntity entity, final DbAttribute column) {
  
          return new SetNotNullToDb(entity, column) {
  
              @Override
              public List<String> createSql(DbAdapter adapter) {
                  StringBuffer sqlBuffer = new StringBuffer();
  
                  sqlBuffer.append("ALTER TABLE ");
                  sqlBuffer.append(adapter.getQuotingStrategy().quotedFullyQualifiedName(getEntity()));
                  sqlBuffer.append(" ALTER COLUMN ");
  
                  adapter.createTableAppendColumn(sqlBuffer, column);
  
                  return Collections.singletonList(sqlBuffer.toString());
              }
  
          };
      }
  
      @Override
      public MergerToken createSetGeneratedFlagToDb(DbEntity entity, DbAttribute column, boolean isGenerated) {
          return new SetGeneratedFlagToDb(entity, column, isGenerated) {
              @Override
              protected void appendAutoIncrement(DbAdapter adapter, StringBuffer builder) {
                  throw new UnsupportedOperationException("Can't automatically alter column to IDENTITY in SQLServer database. You should do this manually.");
              }
  
              @Override
              protected void appendDropAutoIncrement(DbAdapter adapter, StringBuffer builder) {
                  throw new UnsupportedOperationException("Can't automatically alter column to drop IDENTITY in SQLServer database. You should do this manually.");
              }
  
              @Override
              public boolean isEmpty() {
                  return false;
              }
          };
      }
  }
  