com.saperion.database.query

Class NodeExpression<ExpressionType>

java.lang.Object

com.saperion.database.query.QueryExpression<ExpressionType>

com.saperion.database.query.NodeExpression<ExpressionType>

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

BinaryFunction, FieldOrder, OrderByClause, SelectClause, SelectQuery, UnaryOperator

public abstract class NodeExpression<ExpressionType>
extends QueryExpression<ExpressionType>

This is the abstract super class for query expressions that have child expressions.

Author:

jschwarz

See Also:

Serialized Form

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	NodeExpression(Class<ExpressionType> expressionTypeClass, List<? extends QueryExpression<?>> children)
protected	NodeExpression(Class<ExpressionType> expressionTypeClass, QueryExpression<?>... children)

Method Summary

Modifier and Type	Method and Description
void	accept(QueryExpressionVisitor visitor) This method invokes the appropriate callback of the given visitor and delegates it to its children if present.
protected abstract void	finishAccept(QueryExpressionVisitor visitor) This method invokes the appropriate callback of the visitor for the current node, after its children are visited.
List<QueryExpression<?>>	getChildren() This method returns the children of this node.
protected void	setChild(int position, QueryExpression<?> child)
protected abstract void	startAccept(QueryExpressionVisitor visitor) This method invokes the appropriate callback of the visitor for the current node, before its children are visited.

Methods inherited from class com.saperion.database.query.QueryExpression

getExpressionType

Methods inherited from class java.lang.Object

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

Constructor Detail

NodeExpression

protected NodeExpression(Class<ExpressionType> expressionTypeClass,
                         List<? extends QueryExpression<?>> children)

NodeExpression

protected NodeExpression(Class<ExpressionType> expressionTypeClass,
                         QueryExpression<?>... children)

Method Detail

getChildren

public List<QueryExpression<?>> getChildren()

This method returns the children of this node.

Returns:

the children of this node

setChild

protected void setChild(int position,
                        QueryExpression<?> child)

accept

public void accept(QueryExpressionVisitor visitor)

Description copied from class: QueryExpression

This method invokes the appropriate callback of the given visitor and delegates it to its children if present.

Specified by:

accept in class QueryExpression<ExpressionType>

Parameters:

visitor - the visitor visiting this expression

startAccept

protected abstract void startAccept(QueryExpressionVisitor visitor)

This method invokes the appropriate callback of the visitor for the current node, before its children are visited.

Parameters:

visitor - the visitor visiting this expression

finishAccept

protected abstract void finishAccept(QueryExpressionVisitor visitor)

This method invokes the appropriate callback of the visitor for the current node, after its children are visited.

Parameters:

visitor - the visitor visiting this expression