com.saperion.database.query.visitor

Class ExpressionCollector<QueryExpressionType extends QueryExpression<?>>

java.lang.Object

com.saperion.database.query.visitor.SimpleQueryExpressionVisitor

com.saperion.database.query.visitor.ExpressionCollector<QueryExpressionType>

All Implemented Interfaces:

QueryExpressionVisitor

public class ExpressionCollector<QueryExpressionType extends QueryExpression<?>>
extends SimpleQueryExpressionVisitor

This simple query expression visitor collects all expression of a given type in a query.

Author:

jschwarz

Constructor Summary

Constructors

Constructor and Description
ExpressionCollector(Class<QueryExpressionType> classToSearch)

Method Summary

Modifier and Type	Method and Description
static <QueryExpressionType extends QueryExpression<?>> List<QueryExpressionType>	collect(QueryExpression<?> expression, Class<QueryExpressionType> classToSearch) This utility method collects all expression of a given class in an expression.
protected <ExpressionType> void	finishNode(NodeExpression<ExpressionType> node) Implement this method to define the end of generic visits to non leaf nodes.
protected <ExpressionType> void	startNode(NodeExpression<ExpressionType> node) Implement this method to define the start of generic visits to non leaf nodes.
protected <ExpressionType> void	visitLeaf(LeafExpression<ExpressionType> leaf) Implement this method to define generic visits of leafs.

Methods inherited from class com.saperion.database.query.visitor.SimpleQueryExpressionVisitor

finishVisit, finishVisit, finishVisit, finishVisit, finishVisit, finishVisit, finishVisit, finishVisit, finishVisit, finishVisit, finishVisit, finishVisit, finishVisit, finishVisit, finishVisit, finishVisit, finishVisit, finishVisit, finishVisit, finishVisit, finishVisit, finishVisit, finishVisit, finishVisit, finishVisit, finishVisit, startVisit, startVisit, startVisit, startVisit, startVisit, startVisit, startVisit, startVisit, startVisit, startVisit, startVisit, startVisit, startVisit, startVisit, startVisit, startVisit, startVisit, startVisit, startVisit, startVisit, startVisit, startVisit, startVisit, startVisit, startVisit, startVisit, visit, visit, visit, visit, visit, visit

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionCollector

public ExpressionCollector(Class<QueryExpressionType> classToSearch)

Method Detail

visitLeaf

protected <ExpressionType> void visitLeaf(LeafExpression<ExpressionType> leaf)

Description copied from class: SimpleQueryExpressionVisitor

Implement this method to define generic visits of leafs.

Specified by:

visitLeaf in class SimpleQueryExpressionVisitor

Parameters:

leaf - the leaf node visited

startNode

protected <ExpressionType> void startNode(NodeExpression<ExpressionType> node)

Description copied from class: SimpleQueryExpressionVisitor

Implement this method to define the start of generic visits to non leaf nodes.

Specified by:

startNode in class SimpleQueryExpressionVisitor

Parameters:

node - the non lead node visited

finishNode

protected <ExpressionType> void finishNode(NodeExpression<ExpressionType> node)

Description copied from class: SimpleQueryExpressionVisitor

Implement this method to define the end of generic visits to non leaf nodes.

Specified by:

finishNode in class SimpleQueryExpressionVisitor

Parameters:

node - the non lead node visited

collect

public static <QueryExpressionType extends QueryExpression<?>> List<QueryExpressionType> collect(QueryExpression<?> expression,
                                                                                                 Class<QueryExpressionType> classToSearch)

This utility method collects all expression of a given class in an expression. It is subclass aware so collecting all expressions of type QueryExpression will yield a list containing the expression itself and every sub expression.

Type Parameters:

QueryExpressionType - the type of expression to search for

Parameters:

expression - the expression to search in

classToSearch - the type of expression to search for

Returns:

all expression of the given class in the expression