Package org.drools.base.rule.constraint

Class XpathConstraint

java.lang.Object

org.drools.base.rule.MutableTypeConstraint<ContextEntry>

org.drools.base.rule.constraint.XpathConstraint

All Implemented Interfaces:

Externalizable, Serializable, Cloneable, AlphaNodeFieldConstraint, BetaConstraint<ContextEntry>, Constraint, RuleComponent

public class XpathConstraint
extends MutableTypeConstraint<ContextEntry>

See Also:

• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	XpathConstraint.XpathChunk
static class	XpathConstraint.XpathDataProvider

Nested classes/interfaces inherited from interface org.drools.base.rule.constraint.Constraint

Constraint.ConstraintType

Constructor Summary

Constructors

Constructor	Description
XpathConstraint()

Method Summary

Modifier and Type	Method	Description
XpathConstraint.XpathChunk	addChunck(Class<?> clazz, String field, int index, boolean iterate, boolean lazy)
XpathConstraint	clone()	Clones the constraint
ContextEntry	createContext()
LinkedList<XpathConstraint.XpathChunk>	getChunks()
Declaration	getDeclaration()
ReadAccessor	getReadAccessor()
Declaration[]	getRequiredDeclarations()	Returns all the declarations required by the given constraint implementation.
Class<?>	getResultClass()
Constraint.ConstraintType	getType()	Returns the type of the constraint, either ALPHA, BETA or UNKNOWN
Declaration	getXpathStartDeclaration()
boolean	isAllowed(FactHandle handle, ValueResolver valueResolver)
boolean	isAllowedCachedLeft(ContextEntry context, FactHandle handle)
boolean	isAllowedCachedRight(BaseTuple tuple, ContextEntry context)
boolean	isTemporal()	Returns true in case this constraint is a temporal constraint
void	readExternal(ObjectInput in)
void	replaceDeclaration(Declaration oldDecl, Declaration newDecl)	When a rule contains multiple logical branches, i.e., makes use of 'OR' CE, it is required to clone patterns and declarations for each logical branch.
void	setDeclaration(Declaration declaration)
void	setXpathStartDeclaration(Declaration xpathStartDeclaration)
String	toString()
void	writeExternal(ObjectOutput out)

Methods inherited from class org.drools.base.rule.MutableTypeConstraint

cloneIfInUse, setInUse, setType

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.drools.base.rule.constraint.Constraint

addPackageNames, equals, getListenedPropertyMask, getPackageNames, mergeEvaluationContext, registerEvaluationContext

Constructor Details

XpathConstraint

public XpathConstraint()

Method Details

addChunck

public XpathConstraint.XpathChunk addChunck(Class<?> clazz,
 String field,
 int index,
 boolean iterate,
 boolean lazy)

getType

public Constraint.ConstraintType getType()

Description copied from interface: Constraint

Returns the type of the constraint, either ALPHA, BETA or UNKNOWN

Specified by:

getType in interface Constraint

Overrides:

getType in class MutableTypeConstraint<ContextEntry>

Returns:

getRequiredDeclarations

public Declaration[] getRequiredDeclarations()

Description copied from interface: Constraint

Returns all the declarations required by the given constraint implementation.

Returns:

replaceDeclaration

public void replaceDeclaration(Declaration oldDecl,
 Declaration newDecl)

Description copied from interface: Constraint

When a rule contains multiple logical branches, i.e., makes use of 'OR' CE, it is required to clone patterns and declarations for each logical branch. Since this is done at ReteOO build type, when constraints were already created, eventually some constraints need to update their references to the declarations.

clone

public XpathConstraint clone()

Description copied from interface: Constraint

Clones the constraint

Specified by:

clone in interface Constraint

Specified by:

clone in class MutableTypeConstraint<ContextEntry>

Returns:

isTemporal

public boolean isTemporal()

Description copied from interface: Constraint

Returns true in case this constraint is a temporal constraint

Returns:

isAllowedCachedLeft

public boolean isAllowedCachedLeft(ContextEntry context,
 FactHandle handle)

isAllowedCachedRight

public boolean isAllowedCachedRight(BaseTuple tuple,
 ContextEntry context)

createContext

public ContextEntry createContext()

isAllowed

public boolean isAllowed(FactHandle handle,
 ValueResolver valueResolver)

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
ClassNotFoundException

Specified by:

readExternal in interface Externalizable

Overrides:

readExternal in class MutableTypeConstraint<ContextEntry>

Throws:

IOException

ClassNotFoundException

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Overrides:

writeExternal in class MutableTypeConstraint<ContextEntry>

Throws:

IOException

getChunks

public LinkedList<XpathConstraint.XpathChunk> getChunks()

getResultClass

public Class<?> getResultClass()

getDeclaration

public Declaration getDeclaration()

setDeclaration

public void setDeclaration(Declaration declaration)

getReadAccessor

public ReadAccessor getReadAccessor()

getXpathStartDeclaration

public Declaration getXpathStartDeclaration()

setXpathStartDeclaration

public void setXpathStartDeclaration(Declaration xpathStartDeclaration)

toString

public String toString()

Overrides:

toString in class Object