org.openanzo.common.rdb.layout
Class ValueLayout

java.lang.Object
  org.openanzo.common.rdb.layout.ValueLayout

All Implemented Interfaces:

IValueLayout

public class ValueLayout
extends java.lang.Object
implements IValueLayout

Provides read/write access to persisted string values of limited length in a single table. This class's original purpose was for storing RDF datatype and language strings. The length limit is database dependant. For example, a DB2 instance may limit length to 250 chars.

Author:

Joe Betz, Stephen Evanchik

Constructor Summary

ValueLayout(SQLCache sqlCache, NodeType type, Sequence sequence, java.lang.String sequenceName, java.lang.String tableName, java.lang.String optimizationString)
Construct a layout to store String values in a database

Method Summary

void	batchAdd(java.util.Iterator<java.lang.String> iter) Add a set of strings, ignoring resulting IDs
ClosableIterator<NodeSQL.FetchAllCommonValuesResult>	fetchAll() FetchAll the values for this type
java.lang.Long	fetchId(java.lang.String value) Fetch the ID for this value
java.lang.String	fetchValue(java.lang.Long id) Fetch the value for this ID
java.lang.Long	store(java.lang.String value) Store String value

Methods inherited from class java.lang.Object

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

Constructor Detail

ValueLayout

public ValueLayout(SQLCache sqlCache,
                   NodeType type,
                   Sequence sequence,
                   java.lang.String sequenceName,
                   java.lang.String tableName,
                   java.lang.String optimizationString)

Construct a layout to store String values in a database

Parameters:

type - Type of nodes this is storing

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

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

optimizationString - Extra parameters added to queries for database specific optimizations

Method Detail

store

public java.lang.Long store(java.lang.String value)

Description copied from interface: IValueLayout

Store String value

Specified by:

store in interface IValueLayout

Parameters:

value - value to store

Returns:

ID of stored value

fetchId

public java.lang.Long fetchId(java.lang.String value)

Description copied from interface: IValueLayout

Fetch the ID for this value

Specified by:

fetchId in interface IValueLayout

Parameters:

value - value to lookup

Returns:

ID of stored value

fetchValue

public java.lang.String fetchValue(java.lang.Long id)

Description copied from interface: IValueLayout

Fetch the value for this ID

Specified by:

fetchValue in interface IValueLayout

Parameters:

id - id to lookup

Returns:

the value for this ID

batchAdd

public void batchAdd(java.util.Iterator<java.lang.String> iter)

Description copied from interface: IValueLayout

Add a set of strings, ignoring resulting IDs

Specified by:

batchAdd in interface IValueLayout

Parameters:

iter - Set of strings to store

fetchAll

public ClosableIterator<NodeSQL.FetchAllCommonValuesResult> fetchAll()

Description copied from interface: IValueLayout

FetchAll the values for this type

Specified by:

fetchAll in interface IValueLayout

Returns:

all values for this type