edu.neu.ccs.parser
Class AbstractParser.Operation

java.lang.Object
  |
  +--edu.neu.ccs.parser.AbstractParser.Operation

Direct Known Subclasses:

JPTParser.BooleanOperation, JPTParser.NumericOperation

Enclosing class:

AbstractParser

public static class AbstractParser.Operation

extends Object

Class encapsulating an operation and its corresponding String symbol for use with a parser.

Replaces the class named Operator.

Since:

2.2

See Also:

Parser

Field Summary

boolean	isBinary Whether or not the operation can act as a binary operation.
boolean	isUnary Whether or not the operation can act as a unary operation.
String	symbol The symbol representing this operation.

Constructor Summary

AbstractParser.Operation()
Constructs an operation with the default initial settings.

AbstractParser.Operation(String s)
Constructs an operation with the given symbol.

AbstractParser.Operation(String s, boolean unary, boolean binary)
Constructs an operation with the given symbol and settings for unary and binary usage.

Method Summary

protected void	checkBinary() Throws parseException if operation cannot act as binary.
protected void	checkUnary() Throws parseException if operation cannot act as unary.
boolean	isBinary() Returns true if the operation may act as a binary operation.
boolean	isUnary() Returns true if the operation may act as a unary operation.
Object	performOperation(Object left, Object right) Performs the operation on the given values and returns the result.

Methods inherited from class java.lang.Object

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

Field Detail

symbol

public String symbol

The symbol representing this operation.

isUnary

public boolean isUnary

Whether or not the operation can act as a unary operation.

isBinary

public boolean isBinary

Whether or not the operation can act as a binary operation.

Constructor Detail

AbstractParser.Operation

public AbstractParser.Operation()

Constructs an operation with the default initial settings.

AbstractParser.Operation

public AbstractParser.Operation(String s)

Constructs an operation with the given symbol.

Parameters:

s - the symbol for the operation

AbstractParser.Operation

public AbstractParser.Operation(String s,
                                boolean unary,
                                boolean binary)

Constructs an operation with the given symbol and settings for unary and binary usage.

Parameters:

s - the symbol for the operation

unary - whether the operation may be unary

binary - whether the operation may be binary

Method Detail

performOperation

public Object performOperation(Object left,
                               Object right)
                        throws ParseException

Performs the operation on the given values and returns the result. Replaces the method named operationPerformed.

Parameters:

left - the left side operand for a binary operation or null for a unary operation

right - the right side operand for a unary or binary operation

ParseException

Since:

2.2

isUnary

public boolean isUnary()

Returns true if the operation may act as a unary operation.

Since:

2.2

isBinary

public boolean isBinary()

Returns true if the operation may act as a binary operation.

Since:

2.2

checkUnary

protected void checkUnary()
                   throws ParseException

Throws parseException if operation cannot act as unary.

ParseException

checkBinary

protected void checkBinary()
                    throws ParseException

Throws parseException if operation cannot act as binary.

ParseException