Package org.apache.cayenne.access.translator.select

Class JoinStack

java.lang.Object

org.apache.cayenne.access.translator.select.JoinStack

public class JoinStack
extends Object

Encapsulates join reuse/split logic used in SelectQuery processing. All expression path's that exist in the query (in the qualifier, etc.) are processed to produce a combined join tree.

Since:

3.0

Field Summary

Fields

Modifier and Type	Field	Description
protected JoinTreeNode	rootNode
protected JoinTreeNode	topNode

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	JoinStack(DbAdapter dbAdapter, QueryAssembler assembler)

Method Summary

Modifier and Type	Method	Description
protected void	appendJoins(StringBuilder out)	Appends all configured joins to the provided output object.
protected void	appendJoinSubtree(StringBuilder out, JoinTreeNode node)
protected void	appendQualifier(StringBuilder out, boolean firstQualifierElement)	Append join information to the qualifier - the part after "WHERE".
protected String	newAlias()
protected int	size()	Returns the number of configured joins.

Methods inherited from class java.lang.Object

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

Field Details

rootNode

protected JoinTreeNode rootNode

topNode

protected JoinTreeNode topNode

Constructor Details

JoinStack

protected JoinStack(DbAdapter dbAdapter,
QueryAssembler assembler)

Method Details

size

protected int size()

Returns the number of configured joins.

appendJoins

protected void appendJoins(StringBuilder out)

Appends all configured joins to the provided output object.

appendJoinSubtree

protected void appendJoinSubtree(StringBuilder out,
JoinTreeNode node)

appendQualifier

protected void appendQualifier(StringBuilder out,
boolean firstQualifierElement)

Append join information to the qualifier - the part after "WHERE".

newAlias

protected String newAlias()