package liquibase.sqlgenerator.core;

 import liquibase.database.Database;

 import liquibase.exception.DatabaseException;

 import liquibase.exception.UnexpectedLiquibaseException;

 import liquibase.exception.ValidationErrors;

 import liquibase.sql.Sql;

 import liquibase.sql.UnparsedSql;

 import liquibase.sqlgenerator.SqlGenerator;

 import liquibase.sqlgenerator.SqlGeneratorChain;

 import liquibase.statement.core.GetViewDefinitionStatement;

 public class GetViewDefinitionGenerator extends AbstractSqlGenerator<GetViewDefinitionStatement> {

     public ValidationErrors validate(GetViewDefinitionStatement getViewDefinitionStatement, Database database,

             SqlGeneratorChain sqlGeneratorChain) {

         ValidationErrors validationErrors = new ValidationErrors();

         validationErrors.checkRequiredField("viewName", getViewDefinitionStatement.getViewName());

         return validationErrors;

     }

     public Sql[] generateSql(GetViewDefinitionStatement statement, Database database,

             SqlGeneratorChain sqlGeneratorChain) {

         try {

             String sql = "select view_definition from information_schema.views where upper(table_name)='"

                     + statement.getViewName().toUpperCase() + "'";

             if (database.convertRequestedSchemaToCatalog(statement.getSchemaName()) != null) {

                 sql += " and table_schema='" + database.convertRequestedSchemaToSchema(statement.getSchemaName()) + "'";

             } else if (database.convertRequestedSchemaToCatalog(statement.getSchemaName()) != null) {

                 sql += " and table_catalog='" + database.convertRequestedSchemaToCatalog(statement.getSchemaName())

                         + "'";

             }

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

         } catch (DatabaseException e) {

             throw new UnexpectedLiquibaseException(e);

         }

     }

 }