org.cloudgraph.rdb.graph

Class GraphAssembler

java.lang.Object

org.cloudgraph.store.lang.AssemblerSupport

org.cloudgraph.store.lang.DefaultAssembler

org.cloudgraph.rdb.graph.GraphAssembler

All Implemented Interfaces:

LangStoreGraphAssembler, org.plasma.sdo.access.DataGraphAssembler

public class GraphAssembler
extends DefaultAssembler
implements LangStoreGraphAssembler

Constructs a data graph starting with a given root SDO type based on a "selection graph" of selected SDO properties, where properties are mapped by selected types required in the result graph.

The assembly is triggered by calling the GraphAssembler#assemble(List results) method which initializes the graph root and begins a breadth first traversal of the selection graph as represented in the underlying data store.

Various metrics for the assembly are collected using GraphMetricVisitor and are available as SDO instance properties.

Since:

0.6.2

Author:

Scott Cinnamond

See Also:

GraphMetricVisitor

Field Summary

Fields inherited from class org.cloudgraph.store.lang.DefaultAssembler

dataObjectMap, EMPTY_DATA_OBJECT_LIST, EMPTY_PROPERTY_SET, nameComparator, root, rootType, snapshotDate

Fields inherited from class org.cloudgraph.store.lang.AssemblerSupport

collector, statementExecutor, statementFactory

Constructor Summary

Constructors

Constructor and Description
GraphAssembler(org.plasma.sdo.PlasmaType rootType, org.plasma.query.collector.SelectionCollector collector, java.sql.Timestamp snapshotDate, java.sql.Connection con)

Method Summary

Methods

Modifier and Type	Method and Description
void	assemble(java.util.List<org.plasma.sdo.access.provider.common.PropertyPair> results) Initiates the assembly of a data graph based on the given results list.
protected void	assemble(org.plasma.sdo.PlasmaType targetType, org.plasma.sdo.PlasmaDataObject source, org.plasma.sdo.PlasmaProperty sourceProperty, java.util.List<org.plasma.sdo.access.provider.common.PropertyPair> childKeyPairs, int level) Assembles a data object of the given target type by first forming a query using the given key/property pairs.

Methods inherited from class org.cloudgraph.store.lang.DefaultAssembler

clear, collectResults, createDataObject, createHashKey, findDataObject, getDataGraph, initRoot, link

Methods inherited from class org.cloudgraph.store.lang.AssemblerSupport

findNextKeyValue, getChildKeyPairs, getChildKeyPairs, getChildKeyProps, getNextKeyPairs, getPredicateResult, getStatementExecutor, getStatementFactory, throwPriKeyError

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.plasma.sdo.access.DataGraphAssembler

clear, getDataGraph

Constructor Detail

GraphAssembler

public GraphAssembler(org.plasma.sdo.PlasmaType rootType,
              org.plasma.query.collector.SelectionCollector collector,
              java.sql.Timestamp snapshotDate,
              java.sql.Connection con)

Method Detail

assemble

public void assemble(java.util.List<org.plasma.sdo.access.provider.common.PropertyPair> results)

Initiates the assembly of a data graph based on the given results list.

Specified by:

assemble in interface LangStoreGraphAssembler

Specified by:

assemble in class DefaultAssembler

Parameters:

results - the results list

See Also:

DataGraphAssembler.getDataGraph()

assemble

protected void assemble(org.plasma.sdo.PlasmaType targetType,
            org.plasma.sdo.PlasmaDataObject source,
            org.plasma.sdo.PlasmaProperty sourceProperty,
            java.util.List<org.plasma.sdo.access.provider.common.PropertyPair> childKeyPairs,
            int level)

Assembles a data object of the given target type by first forming a query using the given key/property pairs. If an existing data object is mapped for the given key pairs, the existing data object is linked.

Specified by:

assemble in class DefaultAssembler

Parameters:

targetType - the type for the data object to be assembled

source - the source data object

sourceProperty - the source property

childKeyPairs - the key pairs for the data object to be assembled