org.openanzo.common.rdb.layout
Class NodeLayoutBase<T extends org.openrdf.model.Value>

java.lang.Object
  org.openanzo.common.rdb.layout.NodeLayoutBase<T>

Type Parameters:

T - Type of Value being stored

All Implemented Interfaces:

INodeLayout<T>

Direct Known Subclasses:

NodeLiteralLayout, NodeURILayout, NodeXMLLiteralLayout

public abstract class NodeLayoutBase<T extends org.openrdf.model.Value>
extends java.lang.Object
implements INodeLayout<T>

Abstract class. Provides read/write access to node's persisted in either a single table or two tables, where the first table stores nodes short enough to be indexed and the second table stores the long nodes. In the long node table hashes are generated for the indices.

Author:

Joe Betz, Stephen Evanchik

Constructor Summary

NodeLayoutBase(SQLCache sqlCache, Sequence sequence, java.lang.String sequenceName, java.lang.String longSequenceName, java.lang.String tableName, java.lang.String longTableName, java.lang.String resourceTempTableName, java.lang.String idTempTableName, int maxLength, java.lang.String optimizationString)
Construct a layout to store nodes in a database

Method Summary

java.lang.Long	fetchId(T n) Fetches a node's ID from the database
java.lang.String	getLongSequenceName() Get the longSequenceName
java.lang.String	getSequenceName() Get the sequenceName
boolean	isLong(T n) Determines whether or not a node is 'long'

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.openanzo.common.rdb.layout.INodeLayout

convert, fetchValue, getType, resolveStoredIds, resolveStoredNodes, store

Constructor Detail

NodeLayoutBase

public NodeLayoutBase(SQLCache sqlCache,
                      Sequence sequence,
                      java.lang.String sequenceName,
                      java.lang.String longSequenceName,
                      java.lang.String tableName,
                      java.lang.String longTableName,
                      java.lang.String resourceTempTableName,
                      java.lang.String idTempTableName,
                      int maxLength,
                      java.lang.String optimizationString)

Construct a layout to store nodes in a database

Parameters:

sqlCache - The interface to the SQL prepared statement cache

sequence - The sequence Object that is used to get IDs

sequenceName - The name of the sequence that is used to get IDs

longSequenceName - The name of the sequence that is used to get IDs for long objects

tableName - The name of the table where the nodes are stored

longTableName - The name of the table where excessively long nodes are stored

resourceTempTableName - The name of the temporary table used to bulk insert nodes

idTempTableName - The name of the temporary table used to bulk id resolution

maxLength - The maximum length of a node's string representation before it is considered long

optimizationString - Extra parameters added to queries for database specific optimizations

Method Detail

isLong

public boolean isLong(T n)

Determines whether or not a node is 'long'

Parameters:

n - The node to test

Returns:

true if the node is a long node, false otherwise

fetchId

public java.lang.Long fetchId(T n)

Description copied from interface: INodeLayout

Fetches a node's ID from the database

Specified by:

fetchId in interface INodeLayout<T extends org.openrdf.model.Value>

Parameters:

n - The node who's ID is to be found

Returns:

The ID of the node or null if not found

getLongSequenceName

public java.lang.String getLongSequenceName()

Get the longSequenceName

Returns:

the longSequenceName

getSequenceName

public java.lang.String getSequenceName()

Get the sequenceName

Returns:

the sequenceName