com.triactive.jdo.store.query.result
Class NamedResultExpression

java.lang.Object
  com.triactive.jdo.store.query.result.NamedResultExpression

All Implemented Interfaces:

ResultExpression

public class NamedResultExpression

extends java.lang.Object

implements ResultExpression

A result expression that has a textual name.

This class just combines an already existing result expression with a name string. The name is used when the result value gets placed into a Map or user-defined value object.

Author:

Mike Martin

Constructor Summary

NamedResultExpression(ResultExpression expr, java.lang.String name)
Constructs a new named result expression.

Method Summary

java.lang.String	getName() Returns the name of this result expression.
java.lang.Class	getResultType() Returns the type of objects produced by this result expression.
ResultObjectFactory	newResultObjectFactory(java.sql.ResultSet rs) Generates a result object factory to convert expression values from the specified SQL result set into Java objects.

Methods inherited from class java.lang.Object

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

Constructor Detail

NamedResultExpression

public NamedResultExpression(ResultExpression expr,
                             java.lang.String name)

Constructs a new named result expression.

Parameters:

expr - an existing result expression

name - the name for the result expression

Method Detail

getName

public java.lang.String getName()

Returns the name of this result expression.

getResultType

public java.lang.Class getResultType()

Description copied from interface: ResultExpression

Returns the type of objects produced by this result expression.

Specified by:

getResultType in interface ResultExpression

Returns:

The type of objects produced by this result expression. Never returns a primitive type.

newResultObjectFactory

public ResultObjectFactory newResultObjectFactory(java.sql.ResultSet rs)
                                           throws java.sql.SQLException

Description copied from interface: ResultExpression

Generates a result object factory to convert expression values from the specified SQL result set into Java objects.

Specified by:

newResultObjectFactory in interface ResultExpression

Parameters:

rs - the result set containing the columns backing the result expression

Returns:

a new factory that can produce result Java objects of the correct type

Throws:

java.sql.SQLException - if a database error occurs