JSci.io
Class MathMLExpression

java.lang.Object
  JSci.io.MathMLExpression

public final class MathMLExpression
extends java.lang.Object

The MathMLExpression class is used by the MathMLParser to encapsulate math expressions described by the <apply> tag.

Constructor Summary

MathMLExpression()
Constructs a MathML expression.

Method Summary

void	addArgument(java.lang.Object obj) Adds an argument to this expression.
java.lang.Object	evaluate() Evaluates this expression.
java.lang.Object	getArgument(int n) Returns an argument from this expression.
java.lang.String	getOperation() Returns the operation to be applied to the arguments.
int	length() Returns the number of arguments.
void	setOperation(java.lang.String op) Set the operation to be applied to the arguments.
MathMLExpression	substitute(java.util.Map vars) Substitutes several values for variables in this expression.
MathMLExpression	substitute(java.lang.String var, java.lang.Object value) Substitutes a value for a variable in this expression.

Methods inherited from class java.lang.Object

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

Constructor Detail

MathMLExpression

public MathMLExpression()

Constructs a MathML expression.

Method Detail

setOperation

public void setOperation(java.lang.String op)

Set the operation to be applied to the arguments.

Parameters:

op - a MathML tag name (plus, minus, times, divide, etc).

getOperation

public java.lang.String getOperation()

Returns the operation to be applied to the arguments.

Returns:

a MathML tag name.

addArgument

public void addArgument(java.lang.Object obj)

Adds an argument to this expression.

getArgument

public java.lang.Object getArgument(int n)

Returns an argument from this expression.

length

public int length()

Returns the number of arguments.

substitute

public MathMLExpression substitute(java.lang.String var,
                                   java.lang.Object value)

Substitutes a value for a variable in this expression.

Parameters:

var - the variable to substitute for.

value - the value of the variable.

Returns:

the expression after substitution.

substitute

public MathMLExpression substitute(java.util.Map vars)

Substitutes several values for variables in this expression.

Parameters:

vars - a hashtable of variables and values to substitute.

Returns:

the expression after substitution.

evaluate

public java.lang.Object evaluate()

Evaluates this expression.