net.ontopia.topicmaps.impl.basic
Class TMObject

java.lang.Object
  net.ontopia.topicmaps.impl.basic.TMObject

All Implemented Interfaces:

java.io.Serializable, TMObjectIF

Direct Known Subclasses:

Association, AssociationRole, Occurrence, Topic, TopicMap, TopicName, VariantName

public abstract class TMObject
extends java.lang.Object
implements TMObjectIF, java.io.Serializable

INTERNAL: The abstract basic topic map object implementation.

See Also:

Serialized Form

Field Summary

protected static java.lang.String	MSG_NULL_ARGUMENT
protected java.util.Set<LocatorIF>	sources

Method Summary

void	addItemIdentifier(LocatorIF source_locator) PUBLIC: Adds the given item identifier to the set of item item identifiers for this object.
protected void	fireEvent(java.lang.String event, java.lang.Object new_value, java.lang.Object old_value) INTERNAL: Fires an event, so that listeners can be informed about the event.
java.util.Collection<LocatorIF>	getItemIdentifiers() PUBLIC: Gets the item identifiers of this object.
java.lang.String	getObjectId() PUBLIC: Gets the id of this object.
TopicMapIF	getTopicMap() PUBLIC: Gets the topic map that this object belongs to.
protected boolean	isConnected()
boolean	isReadOnly() PUBLIC: Returns true if this object is read-only, otherwise false.
void	removeItemIdentifier(LocatorIF source_locator) PUBLIC: Removes the given item identifier from the set of item identifiers.

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.ontopia.topicmaps.core.TMObjectIF

remove

Field Detail

MSG_NULL_ARGUMENT

protected static final java.lang.String MSG_NULL_ARGUMENT

See Also:

Constant Field Values

sources

protected java.util.Set<LocatorIF> sources

Method Detail

getObjectId

public java.lang.String getObjectId()

Description copied from interface: TMObjectIF

PUBLIC: Gets the id of this object. The object id is part of the topic map id space, and must be unique. The object id is not significant (or unique) outside the current topic map. The object id is immutable. The object id is thus stable through this object's lifetime.

Specified by:

getObjectId in interface TMObjectIF

Returns:

string which is this object's id.

isReadOnly

public boolean isReadOnly()

Description copied from interface: TMObjectIF

PUBLIC: Returns true if this object is read-only, otherwise false.

Specified by:

isReadOnly in interface TMObjectIF

Returns:

read-only (true) or not read-only (false).

getTopicMap

public TopicMapIF getTopicMap()

Description copied from interface: TMObjectIF

PUBLIC: Gets the topic map that this object belongs to. If the object has been removed from its topic map or not added to a topic map yet this will be null.

Specified by:

getTopicMap in interface TMObjectIF

Returns:

A topic map; an object implementing TopicMapIF.

getItemIdentifiers

public java.util.Collection<LocatorIF> getItemIdentifiers()

Description copied from interface: TMObjectIF

PUBLIC: Gets the item identifiers of this object. These locators are pointers back to the locations from where this object originated.

The purpose is to enable the engine to detect when references to external objects refer to objects that are already present within the system, such as topic maps which are already loaded.

Specified by:

getItemIdentifiers in interface TMObjectIF

Returns:

A collection of LocatorIF objects addressing the item.

addItemIdentifier

public void addItemIdentifier(LocatorIF source_locator)
                       throws ConstraintViolationException

Description copied from interface: TMObjectIF

PUBLIC: Adds the given item identifier to the set of item item identifiers for this object.

Specified by:

addItemIdentifier in interface TMObjectIF

Parameters:

source_locator - The item identifier to be added; an object implementing LocatorIF.

Throws:

ConstraintViolationException - Thrown if another object in the same topic map already has the given item identifier.

removeItemIdentifier

public void removeItemIdentifier(LocatorIF source_locator)

Description copied from interface: TMObjectIF

PUBLIC: Removes the given item identifier from the set of item identifiers. If this object does not have the given item identifier the call has no effect.

Specified by:

removeItemIdentifier in interface TMObjectIF

Parameters:

source_locator - The item identifier to be removed; an object implementing LocatorIF.

fireEvent

protected void fireEvent(java.lang.String event,
                         java.lang.Object new_value,
                         java.lang.Object old_value)

INTERNAL: Fires an event, so that listeners can be informed about the event. This method is typically called when the object id modified.

isConnected

protected boolean isConnected()