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

Class Select

java.lang.Object

com.aquima.interactions.expressions.semantics.SemanticNodeBase

com.aquima.interactions.expressions.semantics.nodes.Select

All Implemented Interfaces:

ISemanticNode

public class Select
extends SemanticNodeBase

The select expression can be used to retrieve one or more values that match the specified condition.

Since:

6.4

Author:

O. Kerpershoek, F. van der Meer

Constructor Summary

Constructors

Constructor	Description
Select(Position position, ISemanticNode whatExpr, Identifier alias, ISemanticNode fromExpr, ISemanticNode whereExpr)	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	getFromExpression()	This method returns the expression that should be used to collect the list of objects that should be iterated over.
ISemanticNode	getWhatExpression()	this method returns the expression that should be used to select a value from the active object.
ISemanticNode	getWhereExpression()	This method returns a condition expression that should be evaluated for each active object to check if it should be processed.
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 Details

Select

public Select(Position position,
 ISemanticNode whatExpr,
 Identifier alias,
 ISemanticNode fromExpr,
 ISemanticNode whereExpr)

Constructs the node with the required arguments.

Parameters:

position - Position information for the node.

whatExpr - The expression that should be used to select a value from the active object.

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

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

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

Method Details

getWhatExpression

public ISemanticNode getWhatExpression()

this method returns the expression that should be used to select a value from the active object.

Returns:

The expression that should be used to select a value from the active object.

getFromExpression

public ISemanticNode getFromExpression()

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.

getWhereExpression

public ISemanticNode getWhereExpression()

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.

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.

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