Package com.singularsys.jep.misc

Class NullParser

java.lang.Object
com.singularsys.jep.misc.NullParser
All Implemented Interfaces:
JepComponent, Parser, Serializable
public class NullParser extends 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:

  • Field Details

    • NULL_PARSER

      public static final NullParser NULL_PARSER
      Singleton instance.

  • Constructor Details

    • NullParser

      public NullParser()

  • Method Details

    • init

      public void init(Jep jep)
      Description copied from interface: JepComponent
      Initialize the component. This method 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(Reader stream) throws ParseException
      Description copied from interface: Parser
      Parse a single equation from a stream
      Specified by:
      parse in interface Parser
      Parameters:
      stream - input reader
      Returns:
      the root node of the expression tree
      Throws:
      ParseException - always

    • restart

      public void restart(Reader stream)
      Description copied from interface: Parser
      Restart the parser for reentrant parsing of multiple equations.
      Specified by:
      restart in interface Parser
      Parameters:
      stream - input stream

    • 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 a new instance, null or 'this'.