wt.fc
Class LobLocator

java.lang.Object
  wt.fc.LobLocator

All Implemented Interfaces:

Serializable

public final class LobLocator

extends Object

implements Serializable

LobLocator provides interfaces to store and retrieve large objects (LOBs) from a datastore.

Notes: When an object which contains a LobLocator attribute is retrieved from the datastore,the LobLocator is initialized with "locator" information to enable the actual retrieval of the LOB. This retrieval requires a "2nd trip" and is accomplished via the PersistenceHelper.manager.getLob method. A lob is inserted into the datastore via the PersistenceHelper.manager.setLob method.

Example application code

 Class LobHolder extends ItemAnchor {
    LobLocator aLobLocator;
 }

    LobHolder anObj = LobHolder.find(someCriteria).nextElement();
    InputStream in = PersistenceHelper.manager.getLob(anObj,anObj.getALobLocator());
       do stuff
    InputStream i;
    long len = i.available();  // or some mechanism to determine stream length
    PersistenceHelper.manager.updateLob(anObj.anObj.getALobLocator(),i,len);
 

See Also:

InputStream, Serialized Form

Field Summary

private String	attributeName
private String	columnName
private ObjectIdentifier	oid
private String	primaryKeyName
private String	tableName
private static String	versionID

Constructor Summary

LobLocator()

Method Summary

void	dumpLocator()
String	getAttributeName()
String	getColumnName()
ObjectIdentifier	getObjectIdentifier()
String	getPrimaryKeyName()
String	getTableName()
void	setAttributeName(String aName)
void	setColumnName(String cName)
void	setLocatorNames(String anAttributeName, String aTableName, String aColumnName)
void	setObjectIdentifier(ObjectIdentifier anOid)
void	setPrimaryKeyName(String keyName)
void	setTableName(String tName)

Methods inherited from class java.lang.Object

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

Field Detail

versionID

private static final String versionID

See Also:

Constant Field Values

oid

private ObjectIdentifier oid

primaryKeyName

private String primaryKeyName

attributeName

private String attributeName

tableName

private String tableName

columnName

private String columnName

Constructor Detail

LobLocator

public LobLocator()

Method Detail

getObjectIdentifier

public ObjectIdentifier getObjectIdentifier()

setObjectIdentifier

public void setObjectIdentifier(ObjectIdentifier anOid)

getPrimaryKeyName

public String getPrimaryKeyName()

setPrimaryKeyName

public void setPrimaryKeyName(String keyName)

getAttributeName

public String getAttributeName()

setAttributeName

public void setAttributeName(String aName)

getTableName

public String getTableName()

setTableName

public void setTableName(String tName)

getColumnName

public String getColumnName()

setColumnName

public void setColumnName(String cName)

setLocatorNames

public void setLocatorNames(String anAttributeName,
                            String aTableName,
                            String aColumnName)

dumpLocator

public void dumpLocator()