wugle.expression
Class AbstractExpression

java.lang.Object
  |
  +--wugle.expression.AbstractExpression

All Implemented Interfaces:

java.lang.Cloneable, Expression

Direct Known Subclasses:

AbstractBinaryOperator, AbstractUnaryOperator, AbstractValue

public abstract class AbstractExpression

extends java.lang.Object

implements Expression

An abstract implementation of Expression.

AbstractExpression provides a basic implementation of Expression, but is not meant to be a full class. Subclasses should implement appropriate sub-interfaces of Expression in order to define properties and operations.

Version:

0.1.3

Author:

Jacob Perkins

Field Summary

protected org.apache.log4j.Logger	log Logger for logging messages
protected ExpressionOperation	operation Object for delegating operations to.

Constructor Summary

AbstractExpression(java.lang.String symbol, ExpressionOperation operation)
Initializes the Expression with a symbol and an ExpressionOperation.

Method Summary

java.lang.Object	clone() Returns a copy of this Expression.
Operator	getParent() Gets the parent Operator, or null if there is no parent.
java.lang.String	getSymbol() Gets the Expression's symbol.
void	setParent(Operator parent) Sets the parent Operator.
java.lang.String	toString() Gets the String representation of the Expression.

Methods inherited from class java.lang.Object

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

Methods inherited from interface wugle.expression.Expression

isEqual

Field Detail

log

protected org.apache.log4j.Logger log

Logger for logging messages

operation

protected ExpressionOperation operation

Object for delegating operations to.

Subclasses can use this object for delegating implemented operations.

Constructor Detail

AbstractExpression

public AbstractExpression(java.lang.String symbol,
                          ExpressionOperation operation)

Initializes the Expression with a symbol and an ExpressionOperation.

Parameters:

symbol - Symbol representing the Expression

operation - Object for delegating operations to

See Also:

operation

Method Detail

toString

public java.lang.String toString()

Gets the String representation of the Expression.

Overrides:

toString in class java.lang.Object

Returns:

The symbol representing the Expression

See Also:

getSymbol()

clone

public java.lang.Object clone()

Description copied from interface: Expression

Returns a copy of this Expression.

Specified by:

clone in interface Expression

Overrides:

clone in class java.lang.Object

Returns:

Copy of the Expression

getParent

public Operator getParent()

Description copied from interface: Expression

Gets the parent Operator, or null if there is no parent.

Specified by:

getParent in interface Expression

Returns:

Parent Operator

setParent

public void setParent(Operator parent)

Description copied from interface: Expression

Sets the parent Operator.

Specified by:

setParent in interface Expression

Parameters:

parent - Parent Operator, or null for no parent

getSymbol

public java.lang.String getSymbol()

Description copied from interface: Expression

Gets the Expression's symbol.

Specified by:

getSymbol in interface Expression

Returns:

String representing the Expression