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exptree
Class expressionTree  

java.lang.Object
  exptree.expressionTree

All Implemented Interfaces:

java.io.Serializable

Direct Known Subclasses:

value, variable

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public class expressionTree

extends java.lang.Object

implements java.io.Serializable

Handles mathematic expressions in a tree structure, including storage, evaluation, and display. Will eventually provide the functionality to manipulate the tree as well.

Version:

1.1 08/19/2000

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Field Summary
(package private)  boolean	cacheable
(package private)  double	cachedValue           Holds the cached value for this branch.
(package private)  exptree.operators.operatorInterface	operator           Holds the operator for this node of the tree.
(package private)  expressionTree[]	params           Holds parameters to this node's operator.

 

Constructor Summary

expressionTree()           Creates a new expressionTree

expressionTree(expressionTree[] prms, exptree.operators.operatorInterface op)           Creates a new expressionTree with operator op and parameters prms[]

 

Method Summary
void	buildCache()           Builds a cache for this branch.
double	evaluate()           Evaluate the expressionTree, returning the result as a double.
expressionTree	getClone(exptree.utilities.variablePackage v)           Convenience method to retrieve a clone of expressionTree as type expressionTree.
java.lang.String	getName()           Returns the name of this node's operator.
int	getNumParams()           Returns the number of parameters this node expects.
exptree.operators.operatorInterface	getOperator()           Returns the operator this node holds.
int	getParamLength()           Returns the number of parameter's this node's operator expects.
expressionTree[]	getParams()           Returns the parameters this node is holding.
boolean	isCacheable()           Determines if this branch of the tree is cacheable (ie, the value never changes).
void	setOperator(exptree.operators.operatorInterface o)           Sets this node's operator.
void	setParams(expressionTree[] p)           Set this node's parameters.
java.lang.String	toString()           Returns a (sort of) human readable string representation of the expression.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

params

expressionTree[] params

Holds parameters to this node's operator.

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operator

exptree.operators.operatorInterface operator

Holds the operator for this node of the tree.

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cachedValue

double cachedValue

Holds the cached value for this branch.

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cacheable

boolean cacheable

Constructor Detail

expressionTree

public expressionTree()

Creates a new expressionTree

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expressionTree

public expressionTree(expressionTree[] prms,
                      exptree.operators.operatorInterface op)

Creates a new expressionTree with operator op and parameters prms[]

Method Detail

getClone

public expressionTree getClone(exptree.utilities.variablePackage v)

Convenience method to retrieve a clone of expressionTree as type expressionTree.

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evaluate

public double evaluate()

Evaluate the expressionTree, returning the result as a double.

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toString

public java.lang.String toString()

Returns a (sort of) human readable string representation of the expression. The resulting string contains the expression written in prefix notation. For example, The simple equation "1+1" would be written as "+(1, 1)". This notation is somewhat unusual, but is the closest written notation to this class' internal representation of the expression.

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getName

public java.lang.String getName()

Returns the name of this node's operator.

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getParamLength

public int getParamLength()

Returns the number of parameter's this node's operator expects.

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setParams

public void setParams(expressionTree[] p)

Set this node's parameters. Note: Currently does not check that p[] has the correct number of elements. If p[] has too many elements, the extras are simply thrown out. If, however, there are too few, the results are unpredicatable. This behavior should be modified in future versions to be more robust.

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getNumParams

public int getNumParams()

Returns the number of parameters this node expects.

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getParams

public expressionTree[] getParams()

Returns the parameters this node is holding.

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getOperator

public exptree.operators.operatorInterface getOperator()

Returns the operator this node holds.

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setOperator

public void setOperator(exptree.operators.operatorInterface o)

Sets this node's operator. Note: If the new operator expects more parameters than the current operator, results are unpredicatable. This behaviour should be modified in future version to be more robust.

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isCacheable

public boolean isCacheable()

Determines if this branch of the tree is cacheable (ie, the value never changes). A side effect of calling this function is that a cache is built.

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buildCache

public void buildCache()

Builds a cache for this branch. Simply calls the isCacheable() method, throwing away its return value.

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> [ exptree overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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