de.unidu.is.expressions
Class ArgNExpression

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

All Implemented Interfaces:

Expression

Direct Known Subclasses:

ProductNExpression, SumNExpression

public class ArgNExpression

extends AbstractExpression

An expression with an operator and a list of arguments, e.g. the sum of expressions.

Since:

2003-10-27

Version:

$Revision: 1.4 $, $Date: 2005/02/21 17:29:18 $

Author:

Henrik Nottelmann

Field Summary

protected java.util.List	args List of arguments of this expression.
protected java.lang.String	op Expression operator.

Constructor Summary

ArgNExpression(java.lang.String op, java.util.List args)
Creates a new expression object.

Method Summary

java.lang.String	getSQLTemplate() Returns a string representation for this expression which can be used as a template in an SQL statement.
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 in infix notation, embedded in round brackets.

Methods inherited from class java.lang.Object

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

Field Detail

op

protected java.lang.String op

Expression operator.

args

protected java.util.List args

List of arguments of this expression.

Constructor Detail

ArgNExpression

public ArgNExpression(java.lang.String op,
                      java.util.List args)

Creates a new expression object.

Parameters:

op - expression operator

args - list of arguments of this expression

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 arguments are 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 in infix notation, embedded in round brackets.

Returns:

expression as a string

getSQLTemplate

public java.lang.String getSQLTemplate()

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