org.qbroker.common

Class Term

java.lang.Object

org.qbroker.common.Term

All Implemented Interfaces:

Expression

public class Term
extends java.lang.Object
implements Expression

Term implements the interface of Expression. It is the smallest unit of an expression.

Author:

yannanlu@yahoo.com

Field Summary

Fields

Modifier and Type	Field and Description
static int	COMP_EQ
static int	COMP_EQS
static int	COMP_GE
static int	COMP_GT
static int	COMP_LE
static int	COMP_LT
static int	COMP_MTS
static int	COMP_NE
static int	COMP_NES
static int	COMP_NMS
static int	COMP_NONE

Fields inherited from interface org.qbroker.common.Expression

EVAL_ADD, EVAL_AND, EVAL_DIV, EVAL_MOD, EVAL_MUL, EVAL_NONE, EVAL_OR, EVAL_SUB, FALSE, TRUE

Constructor Summary

Constructors

Constructor and Description
Term(java.lang.Number value)
Term(java.lang.String text)

Method Summary

Modifier and Type	Method and Description
java.lang.Number	evaluate() returns the value of the expression
int	getOperation() returns the operation id of the expression
java.lang.String	getText() returns the original text of the expression
boolean	isNegative() returns the isNegative flag of the expression
boolean	isNumeric() returns true if the expression is numeric or false otherwise
void	negate() sets the isNegative flag to true
void	setOperation(int op) sets the operation to the expression
int	size() returns total number of the items in the expression

Methods inherited from class java.lang.Object

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

Field Detail

COMP_NONE

public static final int COMP_NONE

See Also:

Constant Field Values

COMP_EQ

public static final int COMP_EQ

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Constant Field Values

COMP_NE

public static final int COMP_NE

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Constant Field Values

COMP_GT

public static final int COMP_GT

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Constant Field Values

COMP_GE

public static final int COMP_GE

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Constant Field Values

COMP_LT

public static final int COMP_LT

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Constant Field Values

COMP_LE

public static final int COMP_LE

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Constant Field Values

COMP_EQS

public static final int COMP_EQS

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Constant Field Values

COMP_NES

public static final int COMP_NES

See Also:

Constant Field Values

COMP_MTS

public static final int COMP_MTS

See Also:

Constant Field Values

COMP_NMS

public static final int COMP_NMS

See Also:

Constant Field Values

Constructor Detail

Term

public Term(java.lang.Number value)

Term

public Term(java.lang.String text)

Method Detail

evaluate

public java.lang.Number evaluate()

Description copied from interface: Expression

returns the value of the expression

Specified by:

evaluate in interface Expression

size

public int size()

Description copied from interface: Expression

returns total number of the items in the expression

Specified by:

size in interface Expression

isNumeric

public boolean isNumeric()

Description copied from interface: Expression

returns true if the expression is numeric or false otherwise

Specified by:

isNumeric in interface Expression

getText

public java.lang.String getText()

Description copied from interface: Expression

returns the original text of the expression

Specified by:

getText in interface Expression

getOperation

public int getOperation()

Description copied from interface: Expression

returns the operation id of the expression

Specified by:

getOperation in interface Expression

setOperation

public void setOperation(int op)

Description copied from interface: Expression

sets the operation to the expression

Specified by:

setOperation in interface Expression

isNegative

public boolean isNegative()

Description copied from interface: Expression

returns the isNegative flag of the expression

Specified by:

isNegative in interface Expression

negate

public void negate()

Description copied from interface: Expression

sets the isNegative flag to true

Specified by:

negate in interface Expression