de.unidu.is.expressions
Class FunctionExpression

java.lang.Object
  de.unidu.is.expressions.AbstractExpression
      de.unidu.is.expressions.FunctionExpression

All Implemented Interfaces:

Expression

Direct Known Subclasses:

Str2NumFunctionExpression

public class FunctionExpression

extends AbstractExpression

An expression for functions.

Since:

2003-10-27

Version:

$Revision: 1.5 $, $Date: 2005/03/01 09:31:24 $

Author:

Henrik Nottelmann

Field Summary

protected Expression	arg Function argument.
protected java.lang.String	name Function name.

Constructor Summary

FunctionExpression(java.lang.String name, Expression arg)
Creates a new expression object.

Method Summary

Expression	getArgument() Returns the function argument.
java.lang.String	getName() Returns the function name.
java.lang.String	getSQLTemplate() Returns a string representation for this expression which can be used as a template in an SQL statement.
void	setArgument(Expression argument) Sets the function argument.
void	setName(java.lang.String string) Sets the function name.
Expression	substitute(java.util.Map binding) Performs an substitution for variables, e.g. for each key variable in the specified binding, all occurences of ${key} are replaced by the corresponding value in the map.
java.lang.String	toString() Returns the expression, starting with an ampersand.

Methods inherited from class java.lang.Object

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

Field Detail

name

protected java.lang.String name

Function name.

arg

protected Expression arg

Function argument.

Constructor Detail

FunctionExpression

public FunctionExpression(java.lang.String name,
                          Expression arg)

Creates a new expression object.

Parameters:

name - function name

arg - function argument

Method Detail

substitute

public Expression substitute(java.util.Map binding)

Performs an substitution for variables, e.g. for each key variable in the specified binding, all occurences of ${key} are replaced by the corresponding value in the map.

Only the argument is substituted.

Specified by:

substitute in interface Expression

Overrides:

substitute in class AbstractExpression

Parameters:

binding - variable binding

Returns:

expression after substitution

toString

public java.lang.String toString()

Returns the expression, starting with an ampersand.

Returns:

expression as a string

getSQLTemplate

public java.lang.String getSQLTemplate()

Description copied from class: AbstractExpression

Returns a string representation for this expression which can be used as a template in an SQL statement.

Specified by:

getSQLTemplate in interface Expression

Overrides:

getSQLTemplate in class AbstractExpression

Returns:

template for SQL statements

getArgument

public Expression getArgument()

Returns the function argument.

Returns:

function argument

getName

public java.lang.String getName()

Returns the function name.

Returns:

function name

setArgument

public void setArgument(Expression argument)

Sets the function argument.

Parameters:

argument - function argument

setName

public void setName(java.lang.String string)

Sets the function name.

Parameters:

string - function name