Package com.aquima.interactions.expressions.semantics.nodes

Class Predicate

java.lang.Object

com.aquima.interactions.expressions.semantics.SemanticNodeBase

com.aquima.interactions.expressions.semantics.nodes.Predicate

All Implemented Interfaces:

ISemanticNode

public class Predicate
extends SemanticNodeBase

Predicate expression node (each, exists, isactive) that evaluates to a boolean.

Since:

6.4

Author:

O. Kerpershoek, F. van der Meer

Constructor Summary

Constructors

Constructor	Description
Predicate(Position position, PredicateType type, ISemanticNode fromNode, Identifier alias, ISemanticNode whereNode)	Constructs the node with the required arguments.

Method Summary

Modifier and Type	Method	Description
void	collectScopedObjects(ScopedObjects resultSet)	This method may be used to collect the names of the objects that need to be in scope in order to evaluate the expression of this node.
Identifier	getAlias()	This method returns the name that should be used for each active object from the "fromExpr" expression.
ISemanticNode[]	getChildNodes()	This method returns an array containing the child nodes.
ISemanticNode	getFromNode()	This method returns the expression that should be used to collect the list of objects that should be iterated over.
ISemanticNode	getWhereNode()	This method returns a condition expression that should be evaluated for each active object to check if it should be processed.
boolean	isEachPredicate()	This method returns a boolean indicating if this node represents an EACH predicate.
boolean	isExistsPredicate()	This method returns a boolean indicating if this node represents an EXISTS predicate.
boolean	isIsActivePredicate()	Indicates that this node is an ISACTIVE predicate
String	toString()
void	visit(ISemanticNodeVisitor visitor)	This method allows a type safe visitation of the node.

Methods inherited from class com.aquima.interactions.expressions.semantics.SemanticNodeBase

addMessage, getDataType, getDomain, getMessages, getPosition, getType, hasMessage, isDerivedType, isMultivalue, setDerived, setDomain, setType, setType

Methods inherited from class java.lang.Object

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

Constructor Detail

Predicate

public Predicate(Position position,
                 PredicateType type,
                 ISemanticNode fromNode,
                 Identifier alias,
                 ISemanticNode whereNode)

Constructs the node with the required arguments.

Parameters:

position - Position information for the node.

type - The type of the predicate node.

fromNode - The expression that should be used to collect the list of objects that should be iterated over.

alias - The name that should be used for each active object from the "fromExpr" expression.

whereNode - Condition expression that should be evaluated for each active object to check if it should be processed.

Method Detail

getChildNodes

public ISemanticNode[] getChildNodes()

Description copied from interface: ISemanticNode

This method returns an array containing the child nodes. The order of the child nodes in the array is not defined, and the array may be empty for nodes that do not have child nodes.

Returns:

Array containing the child nodes of this node.

collectScopedObjects

public void collectScopedObjects(ScopedObjects resultSet)

Description copied from interface: ISemanticNode

This method may be used to collect the names of the objects that need to be in scope in order to evaluate the expression of this node. The object passed to the method will be enriched with the names of the objects that need to be in scope.

Parameters:

resultSet - The object that should be used to add the names of the objects that need to be in scope to.

getFromNode

public ISemanticNode getFromNode()

This method returns the expression that should be used to collect the list of objects that should be iterated over.

Returns:

The expression that should be used to collect the list of objects that should be iterated over.

getWhereNode

public ISemanticNode getWhereNode()

This method returns a condition expression that should be evaluated for each active object to check if it should be processed.

Returns:

Condition expression that should be evaluated for each active object to check if it should be processed.

getAlias

public Identifier getAlias()

This method returns the name that should be used for each active object from the "fromExpr" expression.

Returns:

The name that should be used for each active object from the "fromExpr" expression.

isEachPredicate

public boolean isEachPredicate()

This method returns a boolean indicating if this node represents an EACH predicate.

Returns:

a boolean indicating if this node represents an EACH predicate.

isExistsPredicate

public boolean isExistsPredicate()

This method returns a boolean indicating if this node represents an EXISTS predicate.

Returns:

a boolean indicating if this node represents an EXISTS predicate.

isIsActivePredicate

public boolean isIsActivePredicate()

Indicates that this node is an ISACTIVE predicate

Returns:

true if predicate is ISACTIVE

visit

public void visit(ISemanticNodeVisitor visitor)

Description copied from interface: ISemanticNode

This method allows a type safe visitation of the node. The visit method will not invoke the visitor for any child nodes.

Parameters:

visitor - The visitor that should be invoked for this node.

toString

public String toString()

Overrides:

toString in class SemanticNodeBase