Package org.drools.base.rule

Class Accumulate

java.lang.Object

org.drools.base.rule.ConditionalElement

org.drools.base.rule.Accumulate

All Implemented Interfaces:

Externalizable, Serializable, Cloneable, PatternSource, RuleComponent, RuleConditionElement

Direct Known Subclasses:

MultiAccumulate, SingleAccumulate

public abstract class Accumulate
extends ConditionalElement
implements PatternSource

A class to represent the Accumulate CE

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected List<Accumulate>	cloned
protected Declaration[]	innerDeclarationCache
protected Declaration[]	requiredDeclarations
protected RuleConditionElement	source

Constructor Summary

Constructors

Constructor	Description
Accumulate()
Accumulate(RuleConditionElement source, Declaration[] requiredDeclarations)

Method Summary

Modifier and Type	Method	Description
abstract Object	accumulate(Object workingMemoryContext, Object context, BaseTuple match, FactHandle handle, ValueResolver valueResolver)	Executes the accumulate (action) code for the given fact handle
abstract Object	accumulate(Object workingMemoryContext, BaseTuple match, FactHandle childHandle, Object groupByContext, Object tupleList, ValueResolver valueResolver)
abstract Accumulate	clone()	Returns a clone from itself
abstract Object	createFunctionContext()
abstract Object	createWorkingMemoryContext()
abstract Accumulator[]	getAccumulators()
protected Declaration[]	getInnerDeclarationCache()
Map<String,Declaration>	getInnerDeclarations()	Returns a Map of declarations that are visible inside this conditional element
List<RuleConditionElement>	getNestedElements()	Returs a list of RuleConditionElement's that are nested inside the current element
Map<String,Declaration>	getOuterDeclarations()	Returns a Map of declarations that are visible outside this conditional element.
Declaration[]	getRequiredDeclarations()
abstract Object	getResult(Object workingMemoryContext, Object context, BaseTuple leftTuple, ValueResolver valueResolver)	Gets the result of the accumulation
RuleConditionElement	getSource()
boolean	hasRequiredDeclarations()
abstract Object	init(Object workingMemoryContext, Object accContext, Object funcContext, BaseTuple leftTuple, ValueResolver valueResolver)	Executes the initialization block of code
boolean	isGroupBy()
abstract boolean	isMultiFunction()
boolean	isPatternScopeDelimiter()	Returns true in case this RuleConditionElement delimits a pattern visibility scope.
void	readExternal(ObjectInput in)
protected void	registerClone(Accumulate clone)
abstract void	replaceAccumulatorDeclaration(Declaration declaration, Declaration resolved)
void	replaceDeclaration(Declaration declaration, Declaration resolved)
boolean	requiresLeftActivation()
Declaration	resolveDeclaration(String identifier)	Resolves the given identifier in the current scope and returns the Declaration object for the declaration.
abstract boolean	supportsReverse()	Returns true if this accumulate supports reverse
abstract boolean	tryReverse(Object workingMemoryContext, Object context, BaseTuple leftTuple, FactHandle handle, BaseTuple match, ValueResolver valueResolver)	Executes the reverse (action) code for the given fact handle
void	writeExternal(ObjectOutput out)

Methods inherited from class java.lang.Object

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

Field Details

source

protected RuleConditionElement source

requiredDeclarations

protected Declaration[] requiredDeclarations

innerDeclarationCache

protected Declaration[] innerDeclarationCache

cloned

protected List<Accumulate> cloned

Constructor Details

Accumulate

public Accumulate()

Accumulate

public Accumulate(RuleConditionElement source,
 Declaration[] requiredDeclarations)

Method Details

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
ClassNotFoundException

Specified by:

readExternal in interface Externalizable

Throws:

IOException

ClassNotFoundException

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Throws:

IOException

getAccumulators

public abstract Accumulator[] getAccumulators()

createFunctionContext

public abstract Object createFunctionContext()

init

public abstract Object init(Object workingMemoryContext,
 Object accContext,
 Object funcContext,
 BaseTuple leftTuple,
 ValueResolver valueResolver)

Executes the initialization block of code

accumulate

public abstract Object accumulate(Object workingMemoryContext,
 Object context,
 BaseTuple match,
 FactHandle handle,
 ValueResolver valueResolver)

Executes the accumulate (action) code for the given fact handle

tryReverse

public abstract boolean tryReverse(Object workingMemoryContext,
 Object context,
 BaseTuple leftTuple,
 FactHandle handle,
 BaseTuple match,
 ValueResolver valueResolver)

Executes the reverse (action) code for the given fact handle

getResult

public abstract Object getResult(Object workingMemoryContext,
 Object context,
 BaseTuple leftTuple,
 ValueResolver valueResolver)

Gets the result of the accumulation

supportsReverse

public abstract boolean supportsReverse()

Returns true if this accumulate supports reverse

clone

public abstract Accumulate clone()

Description copied from interface: RuleConditionElement

Returns a clone from itself

Specified by:

clone in interface RuleConditionElement

Specified by:

clone in class ConditionalElement

Returns:

registerClone

protected void registerClone(Accumulate clone)

getSource

public RuleConditionElement getSource()

getInnerDeclarations

public Map<String,Declaration> getInnerDeclarations()

Description copied from interface: RuleConditionElement

Returns a Map of declarations that are visible inside this conditional element

Specified by:

getInnerDeclarations in interface RuleConditionElement

Returns:

getOuterDeclarations

public Map<String,Declaration> getOuterDeclarations()

Description copied from interface: RuleConditionElement

Returns a Map of declarations that are visible outside this conditional element.

Specified by:

getOuterDeclarations in interface RuleConditionElement

Returns:

resolveDeclaration

public Declaration resolveDeclaration(String identifier)

Description copied from interface: RuleConditionElement

Resolves the given identifier in the current scope and returns the Declaration object for the declaration. Returns null if identifier can not be resolved.

Specified by:

resolveDeclaration in interface RuleConditionElement

Returns:

createWorkingMemoryContext

public abstract Object createWorkingMemoryContext()

getNestedElements

public List<RuleConditionElement> getNestedElements()

Description copied from interface: RuleConditionElement

Returs a list of RuleConditionElement's that are nested inside the current element

Specified by:

getNestedElements in interface RuleConditionElement

Returns:

isPatternScopeDelimiter

public boolean isPatternScopeDelimiter()

Description copied from interface: RuleConditionElement

Returns true in case this RuleConditionElement delimits a pattern visibility scope. For instance, AND CE is not a scope delimiter, while NOT CE is a scope delimiter

Specified by:

isPatternScopeDelimiter in interface RuleConditionElement

Returns:

isMultiFunction

public abstract boolean isMultiFunction()

replaceDeclaration

public void replaceDeclaration(Declaration declaration,
 Declaration resolved)

replaceAccumulatorDeclaration

public abstract void replaceAccumulatorDeclaration(Declaration declaration,
 Declaration resolved)

getInnerDeclarationCache

protected Declaration[] getInnerDeclarationCache()

getRequiredDeclarations

public Declaration[] getRequiredDeclarations()

hasRequiredDeclarations

public boolean hasRequiredDeclarations()

requiresLeftActivation

public boolean requiresLeftActivation()

Specified by:

requiresLeftActivation in interface PatternSource

isGroupBy

public boolean isGroupBy()

accumulate

public abstract Object accumulate(Object workingMemoryContext,
 BaseTuple match,
 FactHandle childHandle,
 Object groupByContext,
 Object tupleList,
 ValueResolver valueResolver)