org.apache.derby.iapi.services.property

Interface PersistentSet

All Known Subinterfaces:

TransactionController, TransactionManager, XATransactionController

All Known Implementing Classes:

RAMTransaction

public interface PersistentSet

Method Summary

Methods

Modifier and Type	Method and Description
java.util.Properties	getProperties() Get properties that can be stored in a java.util.Properties object.
java.io.Serializable	getProperty(java.lang.String key) Gets a value for a stored property.
java.io.Serializable	getPropertyDefault(java.lang.String key) Gets a default value for a stored property.
boolean	propertyDefaultIsVisible(java.lang.String key) Return true if the default property is visible.
void	setProperty(java.lang.String key, java.io.Serializable value, boolean dbOnlyProperty) Sets the Serializable object associated with a property key.
void	setPropertyDefault(java.lang.String key, java.io.Serializable value) Sets the Serializable object default value associated with a property key.

Method Detail

getProperty

java.io.Serializable getProperty(java.lang.String key)
                                 throws StandardException

Gets a value for a stored property. The returned value will be:

1. the de-serialized object associated with the key using setProperty if such a value is defined or
2. the default de-serialized object associated with the key using setPropertyDefault if such a value is defined or
3. null

The Store provides a transaction protected list of database properties. Higher levels of the system can store and retrieve these properties once Recovery has finished. Each property is a serializable object and is stored/retrieved using a String key.

Parameters:

key - The "key" of the property that is being requested.

Returns:

object The requested object or null.

Throws:

StandardException - Standard exception policy.

getPropertyDefault

java.io.Serializable getPropertyDefault(java.lang.String key)
                                        throws StandardException

Gets a default value for a stored property. The returned value will be:

1. the default de-serialized object associated with the key using setPropertyDefault if such a value is defined or
2. null

The Store provides a transaction protected list of database properties. Higher levels of the system can store and retrieve these properties once Recovery has finished. Each property is a serializable object and is stored/retrieved using a String key.

Parameters:

key - The "key" of the property that is being requested.

Returns:

object The requested object or null.

Throws:

StandardException - Standard exception policy.

propertyDefaultIsVisible

boolean propertyDefaultIsVisible(java.lang.String key)
                                 throws StandardException

Return true if the default property is visible. A default is visible as long as the property is not set.

Parameters:

key - The "key" of the property that is being requested.

Throws:

StandardException - Standard exception policy.

setProperty

void setProperty(java.lang.String key,
               java.io.Serializable value,
               boolean dbOnlyProperty)
                 throws StandardException

Sets the Serializable object associated with a property key.

See the discussion of getProperty().

The value stored may be a Formatable object or a Serializable object whose class name starts with java.*. This stops arbitary objects being stored in the database by class name, which will cause problems in obfuscated/non-obfuscated systems.

Parameters:

key - The key used to lookup this property.

value - The value to be associated with this key. If null, delete the property from the properties list.

dbOnlyProperty - True if property is only ever searched for int the database properties.

Throws:

StandardException - Standard exception policy.

setPropertyDefault

void setPropertyDefault(java.lang.String key,
                      java.io.Serializable value)
                        throws StandardException

Sets the Serializable object default value associated with a property key.

See the discussion of getProperty().

The value stored may be a Formatable object or a Serializable object whose class name starts with java.*. This stops arbitary objects being stored in the database by class name, which will cause problems in obfuscated/non-obfuscated systems.

Parameters:

key - The key used to lookup this propertyDefault.

value - The default value to be associated with this key. If null, delete the property default from the properties list.

Throws:

StandardException - Standard exception policy.

getProperties

java.util.Properties getProperties()
                                   throws StandardException

Get properties that can be stored in a java.util.Properties object.

Get the sub-set of stored properties that can be stored in a java.util.Properties object. That is all the properties that have a value of type java.lang.String. Changes to this properties object are not reflected in any persisent storage.

Code must use the setProperty() method call.

Returns:

The sub-set of stored properties that can be stored in a java.util.Propertes object.

Throws:

StandardException - Standard exception policy.