com.singularsys.jep.misc
Class NullParser

java.lang.Object
  com.singularsys.jep.misc.NullParser

All Implemented Interfaces:

JepComponent, Parser, java.io.Serializable

public class NullParser
extends java.lang.Object
implements Parser

A Parser which cannot actually parse expressions. Used in situations where a small footprint Jep instance is needed which does not require parsing facilities.

See Also:

Serialized Form

Constructor Summary

NullParser()

Method Summary

Node	continueParse() Read the next equation from the stream.
JepComponent	getLightWeightInstance() Gets a light-weight instance suitable for using in multiple threads.
void	init(Jep jep) Initialize the component.
Node	parse(java.io.Reader stream) Parse a single equation from a stream
void	restart(java.io.Reader stream) Restart the parser for reentrant parsing of multiple equations.

Methods inherited from class java.lang.Object

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

Constructor Detail

NullParser

public NullParser()

Method Detail

init

public void init(Jep jep)

Description copied from interface: JepComponent

Initialize the component. This methods is called whenever a component is added to Jep. Hence it allows components to keep track of the other components they may rely on.

Specified by:

init in interface JepComponent

Parameters:

jep - the current Jep instance

continueParse

public Node continueParse()
                   throws ParseException

Description copied from interface: Parser

Read the next equation from the stream. By default empty expressions should be silently ignored.

Specified by:

continueParse in interface Parser

Returns:

the root node of the expression tree

Throws:

ParseException - always

parse

public Node parse(java.io.Reader stream)
           throws ParseException

Description copied from interface: Parser

Parse a single equation from a stream

Specified by:

parse in interface Parser

Returns:

the root node of the expression tree

Throws:

ParseException - always

restart

public void restart(java.io.Reader stream)

Description copied from interface: Parser

Restart the parser for reentrant parsing of multiple equations.

Specified by:

restart in interface Parser

getLightWeightInstance

public JepComponent getLightWeightInstance()

Description copied from interface: JepComponent

Gets a light-weight instance suitable for using in multiple threads.

Specified by:

getLightWeightInstance in interface JepComponent

Returns:

either an new instance, or 'this'.