net.sf.basedb.util.jep
Class PositionFunction

java.lang.Object
  net.sf.basedb.util.jep.PositionFunction

All Implemented Interfaces:

JepExpressionFunction, JepFunction, org.nfunk.jep.function.PostfixMathCommandI

public class PositionFunction
extends Object
implements JepExpressionFunction

A JEP function class that adds a pos function to a JEP expression parser. The function will look up position. For example: pos()

To be able to use this function it must be registered with the JEP parser. This function can only be used to convert a JEP expression to a Query API Expression. It doesn't support dynamic evalution.

Version:

2.0

Author:

Enell

See Also:

Jep, BioAssaySetUtil.createJepExpression(DbControl, String, DynamicQuery)

Last modified

$Date: 2010-04-20 10:02:16 +0200 (Tue, 20 Apr 2010) $

Constructor Summary

PositionFunction()

Method Summary

boolean	checkNumberOfParameters(int n)
String	getFunctionName() Get the name of this function.
int	getNumberOfParameters()
void	run(Stack stack)
void	setCurNumberOfParameters(int n) Can't be changed.
Expression	toExpression(Node node) Use the Dynamic.column(VirtualColumn) method to create an expression referencing a position.

Methods inherited from class java.lang.Object

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

Constructor Detail

PositionFunction

public PositionFunction()

Method Detail

getFunctionName

public String getFunctionName()

Description copied from interface: JepFunction

Get the name of this function. It is used when registering the function with a JEP parser.

Specified by:

getFunctionName in interface JepFunction

Returns:

The string "pos"

See Also:

JEP.addFunction(String, PostfixMathCommandI)

toExpression

public Expression toExpression(Node node)

Use the Dynamic.column(VirtualColumn) method to create an expression referencing a position.

Specified by:

toExpression in interface JepExpressionFunction

Parameters:

node - The node representing this function

Returns:

An Expression object

getNumberOfParameters

public int getNumberOfParameters()

Specified by:

getNumberOfParameters in interface org.nfunk.jep.function.PostfixMathCommandI

Returns:

Always 0

setCurNumberOfParameters

public void setCurNumberOfParameters(int n)

Can't be changed.

Specified by:

setCurNumberOfParameters in interface org.nfunk.jep.function.PostfixMathCommandI

checkNumberOfParameters

public boolean checkNumberOfParameters(int n)

Specified by:

checkNumberOfParameters in interface org.nfunk.jep.function.PostfixMathCommandI

run

public void run(Stack stack)
         throws ParseException

Specified by:

run in interface org.nfunk.jep.function.PostfixMathCommandI

Throws:

ParseException