Package edu.hws.jcm.functions
Class SummationParser
- java.lang.Object
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- edu.hws.jcm.functions.SummationParser
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- All Implemented Interfaces:
MathObject
,ParserExtension
,java.io.Serializable
public class SummationParser extends java.lang.Object implements ParserExtension
The SummationParser class makes it possible to use summations such as sum(i,1,5,x^i) in a Parser. The summation psedu-function has four parameters: (1) The summation variable, which must be an identifier; (2) The lower limit for the summation, given as an expression; (3) The upper limit for the summation, given as an expression; and (4) The expression that is summed. The values of the lower and upper limit expressions are rounded to the nearest integer. The expression in the fourth parameter can (and presumably will) use the summation variable (as well as other identifiers known to the parser).To use summations with a Parser p, just say p.add(new SummationParser()). It's unlikely that you will ever need to do anything else with SummationParsers. If you want to use a name other than "sum", you can change the name after creating the SummationParser object but before adding it to a parser. (Note, by the way, that parsers by default do not do factorials. If you want a parser that recognizes factorials, you could do something like p = new Parser(Parser.DEFAULT_OPTIONS | Parser.FACTORIAL).)
- See Also:
- Serialized Form
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Constructor Summary
Constructors Constructor Description SummationParser()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
doParse(Parser parser, ParserContext context)
When the name of this ParserExtension is encountered by a parser with which the extension is registered, the parser calls this routine to parse the summation subexpression.java.lang.String
getName()
Get the name, which will be used in place of "sum" in expressions.void
setName(java.lang.String name)
Set the name, which will be used in place of "sum" in expressions.
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Method Detail
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setName
public void setName(java.lang.String name)
Set the name, which will be used in place of "sum" in expressions. This should not be done after the SummationParser has been added to a Parser. The default name is "sum".- Specified by:
setName
in interfaceMathObject
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getName
public java.lang.String getName()
Get the name, which will be used in place of "sum" in expressions.- Specified by:
getName
in interfaceMathObject
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doParse
public void doParse(Parser parser, ParserContext context)
When the name of this ParserExtension is encountered by a parser with which the extension is registered, the parser calls this routine to parse the summation subexpression. The subexpression has the form (, , , ). This method is not meant to be called directly - Specified by:
doParse
in interfaceParserExtension
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