Package org.pjdbc.sql

Class AbstractJdbcTransformer

java.lang.Object

org.pjdbc.sql.AbstractJdbcTransformer

All Implemented Interfaces:

JdbcTransformer

Direct Known Subclasses:

CompositeTransformer, RenameTransformer, SchemaTransformer, WhereTransformer

public abstract class AbstractJdbcTransformer
extends Object
implements JdbcTransformer

Base implementation of JdbcTransformer that performs no transformation. Subclass and override specific methods to add transformation behavior. This class provides identity transformations (returns input unchanged) for all transformation methods, making it easy to implement transformers that only need to transform certain aspects of JDBC operations.

Constructor Summary

Constructors

Constructor	Description
AbstractJdbcTransformer()

Method Summary

Modifier and Type	Method	Description
Object	transformParameter(int parameterIndex, Object value, int sqlType)	Default implementation returns parameter value unchanged.
Object	transformResultValue(int columnIndex, String columnName, Object value, int sqlType)	Default implementation returns result value unchanged.
String	transformSql(String sql)	Default implementation returns SQL unchanged.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

AbstractJdbcTransformer

public AbstractJdbcTransformer()

Method Details

transformSql

public String transformSql(String sql)
                    throws SQLException

Default implementation returns SQL unchanged.

Specified by:

transformSql in interface JdbcTransformer

Parameters:

sql - Original SQL string

Returns:

Transformed SQL string

Throws:

SQLException - if transformation fails

transformParameter

public Object transformParameter(int parameterIndex,
 Object value,
 int sqlType)
                          throws SQLException

Default implementation returns parameter value unchanged.

Specified by:

transformParameter in interface JdbcTransformer

Parameters:

parameterIndex - 1-based parameter index

value - Original parameter value

sqlType - SQL type from java.sql.Types

Returns:

Transformed parameter value

Throws:

SQLException - if transformation fails

transformResultValue

public Object transformResultValue(int columnIndex,
 String columnName,
 Object value,
 int sqlType)
                            throws SQLException

Default implementation returns result value unchanged.

Specified by:

transformResultValue in interface JdbcTransformer

Parameters:

columnIndex - 1-based column index

columnName - Column name (may be null if not available)

value - Original value from ResultSet

sqlType - SQL type from java.sql.Types

Returns:

Transformed value

Throws:

SQLException - if transformation fails