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org.eclipse.emf.query.conditions
Class Condition
java.lang.Object
org.eclipse.emf.query.conditions.Condition
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Direct Known Subclasses:
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DataTypeCondition,
EObjectCondition,
Not,
ObjectInstanceCondition
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public abstract class Condition
- extends
Object
An abstract base class for all Condition objects. It provides
the basic functionality and support for conditions and their logical
connectives that are used to combine Condition objects
together. It answers whether a given Object satisfies it or
not.
This class is intended to be subclassed by clients.
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Field Summary
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static
Condition
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FALSE
A constant Condition object used to indicate a never
satisfied condition |
static
Condition
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TRUE
A constant Condition object used to indicate an always
satisfied condition |
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Constructor Summary
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protected
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Condition
()
A simple constructor. |
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Method Summary
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Condition
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AND
(
Condition condition)
This operation acts like a logical AND between this
Condition and the argument Condition. |
Condition
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EQUIVALENT
(
Condition condition)
This operation acts like a logical Equivalent (if-and-only-if)/( <->)
between this Condition and the argument
Condition. |
Condition
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IMPLIES
(
Condition condition)
This operation acts like a logical Implies (if-then)/(->) between this
Condition and the argument Condition. |
abstract boolean
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isSatisfied
(
Object object)
This operation is the evaluation operation of this Condition
in regard to the argument Object. |
Condition
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OR
(
Condition condition)
This operation acts like a logical OR between this Condition
and the argument Condition. |
Condition
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XOR
(
Condition condition)
This operation acts like a logical XOR between this
Condition and the argument Condition. |
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Methods inherited from class java.lang.
Object
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clone,
equals,
finalize,
getClass,
hashCode,
notify,
notifyAll,
toString,
wait,
wait,
wait
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TRUE
public static final
Condition TRUE
- A constant
Condition object used to indicate an always
satisfied condition
FALSE
public static final
Condition FALSE
- A constant
Condition object used to indicate a never
satisfied condition
Condition
protected Condition()
- A simple constructor.
AND
public
Condition AND(
Condition condition)
- This operation acts like a logical AND between this
Condition and the argument Condition. The
returned Condition is a newly created
Condition which is satisfied only if both its constituent
Condition s are.
Please note that the newly compounded Condition will
evaluate this Condition first, and if the result is
true, it will evaluate the argument
Condition ANDing both results as its own final result.
This means that the argument Condition could be
short-circuited and might not be evaluated at all.
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Parameters:
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condition - a Condition to be ANDed with this one.
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Returns:
- a new compounded
Condition object that represents
the ANDing of this Condition with the argument
Condition.
OR
public
Condition OR(
Condition condition)
- This operation acts like a logical OR between this
Condition
and the argument Condition. The returned
Condition is a newly created Condition
which is satisfied if either of its constituent Condition
s is. Please note that the newly compounded Condition will
evaluate this Condition first, and if the result is
true, it won't evaluate the argument
Condition and it will return true as its
final result, if, on the other hand the evaluation of the first
Condition is false, the argument
Condition will be evaluated and its returned result will
be ORed with this one's and the resulting boolean will be returned as the
compounded Condition own final result. This means that the
argument Condition could be short-circuited and might not
be evaluated at all.
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Parameters:
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condition - a Condition to be ORed with this one.
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Returns:
- a new compounded
Condition object that represents
the ORing of this Condition with the argument
Condition.
XOR
public
Condition XOR(
Condition condition)
- This operation acts like a logical XOR between this
Condition and the argument Condition. The
returned Condition is a newly created
Condition which is satisfied if XORing its constituent
Condition s is.
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Parameters:
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condition - a Condition to be XORed with this one.
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Returns:
- a new compounded
Condition object that represents
the XORing of this Condition with the argument
Condition.
IMPLIES
public
Condition IMPLIES(
Condition condition)
- This operation acts like a logical Implies (if-then)/(->) between this
Condition and the argument Condition. The
returned Condition is a newly created
Condition which is satisfied if the result of this
Condition's evaluation is false, in which
case the argument Condition will not be evaluated at all,
or, if the both its constituent Condition s evaluate to
true.
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Parameters:
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condition - a Condition to be used in the Imply relation
with this one.
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Returns:
- a new compounded
Condition object that represents
the Imply logical relation between this Condition
and the argument Condition.
EQUIVALENT
public
Condition EQUIVALENT(
Condition condition)
- This operation acts like a logical Equivalent (if-and-only-if)/( <->)
between this
Condition and the argument
Condition. The returned Condition is a
newly created Condition which is satisfied if the result
of both its constituent Condition s evaluate to the same
value.(both are true, or both are false)
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Parameters:
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condition - a Condition to be used in the Equivalent
relation with this one.
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Returns:
- a new compounded
Condition object that represents
the Equivalent logical relation between this
Condition and the argument Condition.
isSatisfied
public abstract boolean isSatisfied(
Object object)
- This operation is the evaluation operation of this
Condition
in regard to the argument Object. In other words, the operation answers
whether the argument Object satisfied this Condition or
not.
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Parameters:
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object - an Object to check if it satisfies this Condition
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Returns:
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true if the argument Object satisfies this
Condition,false otherwise.
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