Class Comparison

java.lang.Object

ConditionalExpression

Comparison

public class Comparison
extends ConditionalExpression

A class that represents a comparison appearing in a WHERE clause.

Field Summary

Fields

Modifier and Type	Field and Description
static int	CLIKE A comparison involving CLIKE
static int	EQ A comparison involving = or ==
static int	GT A comparison involving >
static int	GTEQ A comparison involving >
static int	IS_NOT_NULL A comparison involving IS NOT NULL
static int	IS_NULL A comparison involving IS NULL
static int	LIKE A comparison involving LIKE
static int	LT A comparison involving <
static int	LTEQ A comparison involving <=
static int	NOTEQ A comparison involving != or <>

Constructor Summary

Constructors

Constructor and Description
Comparison(int type, CompareTerm left, CompareTerm right) Constructs a Comparison object that represents a comparison involving the specified operator and operands.

Method Summary

Modifier and Type	Method and Description
CompareTerm	getLeftTerm() Returns the left operand of the comparison represented by the called object.
CompareTerm	getRightTerm() Returns the right operand of the comparison represented by the called object.
int	getType() Returns the type of the comparison represented by the called object.
boolean	isTrue() Evaluates the comparison represented by the called object, based on the current values of the operands

Methods inherited from class ConditionalExpression

getLeft, getRight

Methods inherited from class java.lang.Object

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

Field Detail

EQ

public static final int EQ

A comparison involving = or ==

See Also:

Constant Field Values

NOTEQ

public static final int NOTEQ

A comparison involving != or <>

See Also:

Constant Field Values

LT

public static final int LT

A comparison involving <

See Also:

Constant Field Values

GT

public static final int GT

A comparison involving >

See Also:

Constant Field Values

LTEQ

public static final int LTEQ

A comparison involving <=

See Also:

Constant Field Values

GTEQ

public static final int GTEQ

A comparison involving >

See Also:

Constant Field Values

LIKE

public static final int LIKE

A comparison involving LIKE

See Also:

Constant Field Values

CLIKE

public static final int CLIKE

A comparison involving CLIKE

See Also:

Constant Field Values

IS_NULL

public static final int IS_NULL

A comparison involving IS NULL

See Also:

Constant Field Values

IS_NOT_NULL

public static final int IS_NOT_NULL

A comparison involving IS NOT NULL

See Also:

Constant Field Values

Constructor Detail

Comparison

public Comparison(int type,
                  CompareTerm left,
                  CompareTerm right)

Constructs a Comparison object that represents a comparison involving the specified operator and operands.

Parameters:

type - the type of comparison (i.e., the operator)

left - the left operand

right - the right operand (possibly null)

Method Detail

getLeftTerm

public CompareTerm getLeftTerm()

Returns the left operand of the comparison represented by the called object.

Returns:

the left operand

getRightTerm

public CompareTerm getRightTerm()

Returns the right operand of the comparison represented by the called object.

Returns:

the right operand (null if it is a IS NULL or IS NOT NULL comparison

getType

public int getType()

Returns the type of the comparison represented by the called object.

Returns:

the type of the comparison -- i.e., one of the constants defined in this class (e.g., Comparison.EQ for equals)

isTrue

public boolean isTrue()

Evaluates the comparison represented by the called object, based on the current values of the operands

Specified by:

isTrue in class ConditionalExpression

Returns:

true if the comparison is true, and false if it is false!