org.eclipse.stardust.engine.core.persistence

Class Operator

java.lang.Object

org.eclipse.stardust.common.StringKey

org.eclipse.stardust.engine.core.persistence.Operator

All Implemented Interfaces:

Serializable, Comparable

Direct Known Subclasses:

Operator.Binary, Operator.Ternary, Operator.Unary

public abstract class Operator
extends org.eclipse.stardust.common.StringKey

Enum class listing all currently supported comparison operators.

Version:

$Revision$

Author:

rsauer

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Operator.Binary Enum class listing all currently supported binary comparison operators.
static class	Operator.Ternary Enum class listing all currently supported ternary comparison operators.
static class	Operator.Unary Enum class listing all currently supported unary comparison operators.

Field Summary

Fields

Modifier and Type	Field and Description
static Operator.Ternary	BETWEEN Resolves to true if the operand greater than or equal the first given value and less than or equal the second given value.
static Operator.Binary	GREATER_OR_EQUAL Resolves to true if the operand is greater than or equal the given value.
static Operator.Binary	GREATER_THAN Resolves to true if the operand is greater than the given value.
static Operator.Binary	IN Resolves to true if the operand is equal one of the values in the given list.
static Operator.Binary	IS_EQUAL Resolves to true if the operand is equal the given value.
static Operator.Unary	IS_NOT_NULL Resolves to true if the operand does have a value.
static Operator.Unary	IS_NULL Resolves to true if the operand does not have a value.
static Operator.Binary	LESS_OR_EQUAL Resolves to true if the operand less than or equal the given value.
static Operator.Binary	LESS_THAN Resolves to true if the operand is less than the given value.
static Operator.Binary	LIKE Resolves to true if the value of the operand is matched by the given pattern.
static Operator.Binary	NOT_ANY_OF Resolves to true if the operand does not match any of the values in the given list.
static Operator.Binary	NOT_EQUAL Resolves to true if the operand is not equal the given value.
static Operator.Binary	NOT_IN Resolves to true if the operand is not equal any of the values in the given list.

Method Summary

Methods

Modifier and Type	Method and Description
abstract boolean	isBinary() Indicates if the operator is binary, i.e.
abstract boolean	isTernary() Indicates if the operator is ternary, i.e.
abstract boolean	isUnary() Indicates if the operator is unary, i.e.

Methods inherited from class org.eclipse.stardust.common.StringKey

compareTo, equals, getId, getKey, getKey, getKeys, getKeys, getName, hashCode, toString

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Field Detail

IS_NULL

public static final Operator.Unary IS_NULL

Resolves to true if the operand does not have a value.

IS_NOT_NULL

public static final Operator.Unary IS_NOT_NULL

Resolves to true if the operand does have a value.

IS_EQUAL

public static final Operator.Binary IS_EQUAL

Resolves to true if the operand is equal the given value.

NOT_EQUAL

public static final Operator.Binary NOT_EQUAL

Resolves to true if the operand is not equal the given value.

LESS_THAN

public static final Operator.Binary LESS_THAN

Resolves to true if the operand is less than the given value.

LESS_OR_EQUAL

public static final Operator.Binary LESS_OR_EQUAL

Resolves to true if the operand less than or equal the given value.

GREATER_THAN

public static final Operator.Binary GREATER_THAN

Resolves to true if the operand is greater than the given value.

GREATER_OR_EQUAL

public static final Operator.Binary GREATER_OR_EQUAL

Resolves to true if the operand is greater than or equal the given value.

LIKE

public static final Operator.Binary LIKE

Resolves to true if the value of the operand is matched by the given pattern. Pattern syntax may be dependent on context, i.e. regular expressions or SQL LIKE patterns.

IN

public static final Operator.Binary IN

Resolves to true if the operand is equal one of the values in the given list.

NOT_IN

public static final Operator.Binary NOT_IN

Resolves to true if the operand is not equal any of the values in the given list.

NOT_ANY_OF

public static final Operator.Binary NOT_ANY_OF

Resolves to true if the operand does not match any of the values in the given list.

BETWEEN

public static final Operator.Ternary BETWEEN

Resolves to true if the operand greater than or equal the first given value and less than or equal the second given value.

Method Detail

isUnary

public abstract boolean isUnary()

Indicates if the operator is unary, i.e. supports no comparison operands.

Returns:

true if the operator is unary, else false.

isBinary

public abstract boolean isBinary()

Indicates if the operator is binary, i.e. supports one comparison operand.

Returns:

true if the operator is binary, else false.

isTernary

public abstract boolean isTernary()

Indicates if the operator is ternary, i.e. supports two comparison operands.

Returns:

true if the operator is ternary, else false.