package liquibase.sqlgenerator.core;

 import liquibase.change.ColumnConfig;

 import liquibase.database.Database;

 import liquibase.database.core.SQLiteDatabase;

 import liquibase.exception.ValidationErrors;

 import liquibase.sql.Sql;

 import liquibase.sql.UnparsedSql;

 import liquibase.sqlgenerator.SqlGenerator;

 import liquibase.sqlgenerator.SqlGeneratorChain;

 import liquibase.statement.core.CopyRowsStatement;

 public class CopyRowsGenerator extends AbstractSqlGenerator<CopyRowsStatement> {

     @Override

     public boolean supports(CopyRowsStatement statement, Database database) {

         return (database instanceof SQLiteDatabase);

     }

     public ValidationErrors validate(CopyRowsStatement copyRowsStatement, Database database,

             SqlGeneratorChain sqlGeneratorChain) {

         ValidationErrors validationErrors = new ValidationErrors();

         validationErrors.checkRequiredField("targetTable", copyRowsStatement.getTargetTable());

         validationErrors.checkRequiredField("sourceTable", copyRowsStatement.getSourceTable());

         validationErrors.checkRequiredField("copyColumns", copyRowsStatement.getCopyColumns());

         return validationErrors;

     }

     public Sql[] generateSql(CopyRowsStatement statement, Database database, SqlGeneratorChain sqlGeneratorChain) {

         StringBuffer sql = new StringBuffer();

         if (database instanceof SQLiteDatabase) {

             sql.append("INSERT INTO `").append(statement.getTargetTable()).append("` SELECT ");

             for (int i = 0; i < statement.getCopyColumns().size(); i++) {

                 ColumnConfig column = statement.getCopyColumns().get(i);

                 if (i > 0) {

                     sql.append(",");

                 }

                 sql.append("`").append(column.getName()).append("`");

             }

             sql.append(" FROM `").append(statement.getSourceTable()).append("`");

         }

         return new Sql[] { new UnparsedSql(sql.toString()) };

     }

 }