net.sf.magicproject.operation
Class Operation

java.lang.Object
  net.sf.magicproject.operation.Operation

Direct Known Subclasses:

Any, BinaryOperation, Clear, Dummy, IntList, IntValue, TargetList, UnaryOperation

public abstract class Operation
extends java.lang.Object

Reprsent an operation.

Author:

Fabrice Daugan

Method Summary

abstract java.lang.String	getOperator() Return operator name
boolean	isUselessWith(int leftValue, int rightValue) Is this operation is useless or not
abstract int	process(int leftValue, int rightValue) Process a binary operation with two values and return the result.
abstract Expression	readNextExpression(java.io.InputStream inputFile) return the next Expression read from the current offset

Methods inherited from class java.lang.Object

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

Method Detail

readNextExpression

public abstract Expression readNextExpression(java.io.InputStream inputFile)
                                       throws java.io.IOException

return the next Expression read from the current offset

Parameters:

inputFile - is the file containing this expression

Returns:

the next Expression read from the current offset

Throws:

java.io.IOException - if error occured during the reading process from the specified input stream

process

public abstract int process(int leftValue,
                            int rightValue)

Process a binary operation with two values and return the result.

Parameters:

leftValue - the left value of binary operation

rightValue - the right value of binary operation

Returns:

the result

getOperator

public abstract java.lang.String getOperator()

Return operator name

Returns:

the operator name

isUselessWith

public boolean isUselessWith(int leftValue,
                             int rightValue)

Is this operation is useless or not

Parameters:

leftValue - the left value

rightValue - the right value

Returns:

true if this operation will not modify the given left value considering the right value.