com.redhat.lightblue.assoc

Class QueryPlanNode

java.lang.Object

com.redhat.lightblue.assoc.QueryPlanNode

All Implemented Interfaces:

Serializable

public abstract class QueryPlanNode
extends Object
implements Serializable

Abstract base class for query plan node. The node keeps the composite metadata corresponding to this query plan node, and the query clauses associated with it. The actual tree representation of the node is managed by the implementation, which is an inner class in QueryPlan.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected QueryPlanData	data
protected CompositeMetadata	md

Constructor Summary

Constructors

Constructor and Description
QueryPlanNode(CompositeMetadata md, QueryPlanData data) Creates a query plan node using the given composite metadata, and an empty query clauses list
QueryPlanNode(QueryPlanNode source) Copy constructor.

Method Summary

Modifier and Type	Method and Description
QueryPlanData	getData() Returns the query plan data used by the scorer
abstract QueryPlanNode[]	getDestinations() Returns the immediate descendants of this node.
CompositeMetadata	getMetadata() Returns the composite metadata associated with this node
abstract String	getName() The implementation returns the unique name for this node.
<T> T	getProperty(Class<T> propertyClass) Returns the property whose property name is the given class name
Object	getProperty(String propertyName) Returns the property with the given property name
abstract QueryPlanNode[]	getSources() Returns the immediate ancestors of this node.
<T> void	setProperty(Class<T> propertyClass, T propertyValue) Sets the property whose property name is the given class name
void	setProperty(String propertyName, Object value) Sets the property with the given property name

Methods inherited from class java.lang.Object

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

Field Detail

md

protected final CompositeMetadata md

data

protected final QueryPlanData data

Constructor Detail

QueryPlanNode

public QueryPlanNode(CompositeMetadata md,
                     QueryPlanData data)

Creates a query plan node using the given composite metadata, and an empty query clauses list

QueryPlanNode

public QueryPlanNode(QueryPlanNode source)

Copy constructor. A reference to the composite metadata, and a copy of the query clauses is saved.

Method Detail

getMetadata

public CompositeMetadata getMetadata()

Returns the composite metadata associated with this node

getData

public QueryPlanData getData()

Returns the query plan data used by the scorer

getProperty

public Object getProperty(String propertyName)

Returns the property with the given property name

setProperty

public void setProperty(String propertyName,
                        Object value)

Sets the property with the given property name

getProperty

public <T> T getProperty(Class<T> propertyClass)

Returns the property whose property name is the given class name

setProperty

public <T> void setProperty(Class<T> propertyClass,
                            T propertyValue)

Sets the property whose property name is the given class name

getName

public abstract String getName()

The implementation returns the unique name for this node. Used to determine uniqueness in resolving field bindings.

getSources

public abstract QueryPlanNode[] getSources()

Returns the immediate ancestors of this node. If there are none (i.e. node is a source), returns an array with size 0

getDestinations

public abstract QueryPlanNode[] getDestinations()

Returns the immediate descendants of this node. If there are node (i.e. node is a sink), returns an array with size 0