com.espertech.esper.epl.join.assemble

Class BaseAssemblyNodeFactory

java.lang.Object

com.espertech.esper.epl.join.assemble.BaseAssemblyNodeFactory

Direct Known Subclasses:

BranchOptionalAssemblyNodeFactory, BranchRequiredAssemblyNodeFactory, CartesianProdAssemblyNodeFactory, LeafAssemblyNodeFactory, RootCartProdAssemblyNodeFactory, RootOptionalAssemblyNodeFactory, RootRequiredAssemblyNodeFactory

public abstract class BaseAssemblyNodeFactory
extends Object

Represents the factory of a node in a tree responsible for assembling outer join query results.

The tree of factory nodes is double-linked, child nodes know each parent and parent know all child nodes.

Field Summary

Fields

Modifier and Type	Field and Description
protected List<BaseAssemblyNodeFactory>	childNodes Child nodes.
protected int	numStreams Number of streams in statement.
protected BaseAssemblyNodeFactory	parentNode Parent node.
protected int	streamNum Stream number.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	BaseAssemblyNodeFactory(int streamNum, int numStreams) Ctor.

Method Summary

Modifier and Type	Method and Description
void	addChild(BaseAssemblyNodeFactory childNode) Add a child node.
List<BaseAssemblyNodeFactory>	getChildNodes() Returns child nodes.
static List<BaseAssemblyNodeFactory>	getDescendentNodesBottomUp(BaseAssemblyNodeFactory topNode) Returns all descendent nodes to the top node in a list in which the utmost descendants are listed first and the top node itself is listed last.
BaseAssemblyNodeFactory	getParentNode()
protected int	getStreamNum() Returns the stream number.
abstract BaseAssemblyNode	makeAssemblerUnassociated()
abstract void	print(IndentWriter indentWriter) Output this node using writer, not outputting child nodes.
void	printDescendends(IndentWriter indentWriter) Output this node and all descendent nodes using writer, outputting child nodes.
void	setParent(BaseAssemblyNodeFactory parent) Set parent node.

Methods inherited from class java.lang.Object

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

Field Detail

parentNode

protected BaseAssemblyNodeFactory parentNode

Parent node.

childNodes

protected final List<BaseAssemblyNodeFactory> childNodes

Child nodes.

streamNum

protected final int streamNum

Stream number.

numStreams

protected final int numStreams

Number of streams in statement.

Constructor Detail

BaseAssemblyNodeFactory

protected BaseAssemblyNodeFactory(int streamNum,
                                  int numStreams)

Ctor.

Parameters:

streamNum - - stream number of the event stream that this node assembles results for.

numStreams - - number of streams

Method Detail

makeAssemblerUnassociated

public abstract BaseAssemblyNode makeAssemblerUnassociated()

print

public abstract void print(IndentWriter indentWriter)

Output this node using writer, not outputting child nodes.

Parameters:

indentWriter - to use for output

setParent

public void setParent(BaseAssemblyNodeFactory parent)

Set parent node.

Parameters:

parent - parent node

getParentNode

public BaseAssemblyNodeFactory getParentNode()

addChild

public void addChild(BaseAssemblyNodeFactory childNode)

Add a child node.

Parameters:

childNode - to add

getStreamNum

protected int getStreamNum()

Returns the stream number.

Returns:

stream number

getChildNodes

public List<BaseAssemblyNodeFactory> getChildNodes()

Returns child nodes.

Returns:

child nodes

printDescendends

public void printDescendends(IndentWriter indentWriter)

Output this node and all descendent nodes using writer, outputting child nodes.

Parameters:

indentWriter - to output to

getDescendentNodesBottomUp

public static List<BaseAssemblyNodeFactory> getDescendentNodesBottomUp(BaseAssemblyNodeFactory topNode)

Returns all descendent nodes to the top node in a list in which the utmost descendants are listed first and the top node itself is listed last.

Parameters:

topNode - is the root node of a tree structure

Returns:

list of nodes with utmost descendants first ordered by level of depth in tree with top node last