Event (DSpace Kernel :: API and Implementation 4.8 API)

java.lang.Object
- org.dspace.event.Event

All Implemented Interfaces:

Serializable
```
public class Event
extends Object
implements Serializable
```
An Event object represents a single action that changed one object in the DSpace data model. An "atomic" action at the application or business-logic API level may spawn many of these events.
This class includes tools to help set and use the contents of the event. Note that it describes DSpace data object types in two ways: by the type identifiers in the Constants class, and also by an Event-specific bitmask (used by its internal filters). All public API calls use the Constants version of the data model types.
Note that the type of the event itself is actually descriptive of the action it performs: ADD, MODIFY, etc. The most significant elements of the event are:
- (Action) Type
- Subject -- DSpace object to which the action applies, e.g. the Collection to which an ADD adds a member.
- Object -- optional, when present it is the other object effected by an action, e.g. the Item ADDed to a Collection by an ADD.
- detail -- a textual summary of what changed. Content and its significance varies by the combination of action and subject type.
- - timestamp -- exact millisecond timestamp at which event was logged.
Version:

$Revision$

See Also:
Serialized Form

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`ADD`
`static int`	`CREATE` Event (Action) types
`static int`	`DELETE`
`static int`	`EVENT_MASK`
`static int`	`INSTALL`
`static int`	`MODIFY`
`static int`	`MODIFY_METADATA`
`static int`	`REMOVE`
`static int`	`SUBJECT_MASK` Index of filter parts in their array:

Constructor Summary

Constructors
Constructor and Description
`Event(int eventType, int subjectType, int subjectID, int objectType, int objectID, String detail)` Constructor.
`Event(int eventType, int subjectType, int subjectID, String detail)` Constructor.

Method Summary

Methods
Modifier and Type	Method and Description
`boolean`	`equals(Object other)` Compare two events.
`BitSet`	`getBitSet()`
`int`	`getCurrentUser()`
`String`	`getDetail()`
`int`	`getDispatcher()`
`int`	`getEventType()`
`String`	`getEventTypeAsString()` Get the text name of event (action) type.
`String`	`getExtraLogInfo()`
`DSpaceObject`	`getObject(Context context)` Get the DSpace object which is the "object" of an event.
`int`	`getObjectID()`
`int`	`getObjectType()`
`String`	`getObjectTypeAsString()`
`DSpaceObject`	`getSubject(Context context)` Syntactic sugar to get the DSpace object which is the "subject" of an event.
`int`	`getSubjectID()`
`int`	`getSubjectType()`
`String`	`getSubjectTypeAsString()`
`long`	`getTimeStamp()`
`String`	`getTransactionID()`
`int`	`hashCode()`
`static int`	`parseEventType(String s)` Interpret named event type.
`static int`	`parseObjectType(String s)` Translate a textual DSpace Object type name into an event subject-type mask.
`boolean`	`pass(List<int[]> filters)` Test whether this event would pass through a list of filters.
`void`	`setBitSet(String consumerName)` Keeps track of which consumers the event has been consumed by.
`void`	`setCurrentUser(int uid)`
`void`	`setDispatcher(int id)` Set the identifier of the dispatcher that first processed this event.
`void`	`setExtraLogInfo(String info)`
`void`	`setTransactionID(String tid)` Sets value of transactionID element of the event.
`String`	`toString()`

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - CREATE
```
public static final int CREATE
```
    Event (Action) types
    
    See Also:
    Constant Field Values
  - MODIFY
```
public static final int MODIFY
```
    See Also:
    Constant Field Values
  - MODIFY_METADATA
```
public static final int MODIFY_METADATA
```
    See Also:
    Constant Field Values
  - ADD
```
public static final int ADD
```
    See Also:
    Constant Field Values
  - REMOVE
```
public static final int REMOVE
```
    See Also:
    Constant Field Values
  - DELETE
```
public static final int DELETE
```
    See Also:
    Constant Field Values
  - INSTALL
```
public static final int INSTALL
```
    See Also:
    Constant Field Values
  - SUBJECT_MASK
```
public static final int SUBJECT_MASK
```
    Index of filter parts in their array:
    
    See Also:
    Constant Field Values
  - EVENT_MASK
```
public static final int EVENT_MASK
```
    See Also:
    Constant Field Values
- Constructor Detail
  - Event
```
public Event(int eventType,
     int subjectType,
     int subjectID,
     String detail)
```
    Constructor.
    
    Parameters:
    eventType - action type, e.g. Event.ADD.
    subjectType - DSpace Object Type of subject e.g. Constants.ITEM.
    subjectID - database ID of subject instance.
    detail - detail information that depends on context.
  - Event
```
public Event(int eventType,
     int subjectType,
     int subjectID,
     int objectType,
     int objectID,
     String detail)
```
    Constructor.
    
    Parameters:
    eventType - action type, e.g. Event.ADD.
    subjectType - DSpace Object Type of subject e.g. Constants.ITEM.
    subjectID - database ID of subject instance.
    objectType - DSpace Object Type of object e.g. Constants.BUNDLE.
    objectID - database ID of object instance.
    detail - detail information that depends on context.
- Method Detail
  - equals
```
public boolean equals(Object other)
```
    Compare two events. Ignore any difference in the timestamps. Also ignore transactionID since that is not always set initially.
    
    Overrides:
    
    equals in class Object
    
    Parameters:
    other - the event to compare this one to
    
    Returns:
    true if events are "equal", false otherwise.
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - setDispatcher
```
public void setDispatcher(int id)
```
    Set the identifier of the dispatcher that first processed this event.
    
    Parameters:
    id - the unique (hash code) value characteristic of the dispatcher.
  - getObject
```
public DSpaceObject getObject(Context context)
                       throws SQLException
```
    Get the DSpace object which is the "object" of an event.
    
    Returns:
    DSpaceObject or null if none can be found or no object was set.
    
    Throws:
    
    SQLException
  - getSubject
```
public DSpaceObject getSubject(Context context)
                        throws SQLException
```
    Syntactic sugar to get the DSpace object which is the "subject" of an event.
    
    Returns:
    DSpaceObject or null if none can be found.
    
    Throws:
    
    SQLException
  - getSubjectID
```
public int getSubjectID()
```
    Returns:
    database ID of subject of this event.
  - getObjectID
```
public int getObjectID()
```
    Returns:
    database ID of object of this event, or -1 if none was set.
  - getSubjectType
```
public int getSubjectType()
```
    Returns:
    type number (e.g. Constants.ITEM) of subject of this event.
  - getObjectType
```
public int getObjectType()
```
    Returns:
    type number (e.g. Constants.ITEM) of object of this event, or -1 if none was set.
  - getSubjectTypeAsString
```
public String getSubjectTypeAsString()
```
    Returns:
    type of subject of this event as a String, e.g. for logging.
  - getObjectTypeAsString
```
public String getObjectTypeAsString()
```
    Returns:
    type of object of this event as a String, e.g. for logging.
  - parseObjectType
```
public static int parseObjectType(String s)
```
    Translate a textual DSpace Object type name into an event subject-type mask. NOTE: This returns a BIT-MASK, not a numeric type value; the mask is only used within the event system.
    
    Parameters:
    s - text name of object type.
    
    Returns:
    numeric value of object type or 0 for error.
  - getEventType
```
public int getEventType()
```
    Returns:
    event-type (i.e. action) this event, one of the masks like Event.ADD defined above.
  - getEventTypeAsString
```
public String getEventTypeAsString()
```
    Get the text name of event (action) type.
    
    Returns:
    event-type (i.e. action) this event as a String, e.g. for logging.
  - parseEventType
```
public static int parseEventType(String s)
```
    Interpret named event type.
    
    Parameters:
    s - name of event type.
    
    Returns:
    numeric value of event type or 0 for error.
  - getTimeStamp
```
public long getTimeStamp()
```
    Returns:
    timestamp at which event occurred, as a count of milliseconds since the epoch (standard Java format).
  - getDispatcher
```
public int getDispatcher()
```
    Returns:
    hashcode identifier of name of Dispatcher which first dispatched this event. (Needed by asynch dispatch code.)
  - getDetail
```
public String getDetail()
```
    Returns:
    value of detail element of the event.
  - getTransactionID
```
public String getTransactionID()
```
    Returns:
    value of transactionID element of the event.
  - setTransactionID
```
public void setTransactionID(String tid)
```
    Sets value of transactionID element of the event.
    
    Parameters:
    tid - new value of transactionID.
  - setCurrentUser
```
public void setCurrentUser(int uid)
```
  - getCurrentUser
```
public int getCurrentUser()
```
  - setExtraLogInfo
```
public void setExtraLogInfo(String info)
```
  - getExtraLogInfo
```
public String getExtraLogInfo()
```
  - pass
```
public boolean pass(List<int[]> filters)
```
    Test whether this event would pass through a list of filters.
    
    Parameters:
    filters - list of filter masks; each one is an Array of two ints.
    
    Returns:
    true if this event would be passed through the given filter list.
  - setBitSet
```
public void setBitSet(String consumerName)
```
    Keeps track of which consumers the event has been consumed by. Should be called by a dispatcher when calling consume(Context ctx, String name, Event event) on an event.
    
    Parameters:
    consumerName -
  - getBitSet
```
public BitSet getBitSet()
```
    Returns:
    the set of consumers which have consumed this Event.
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object
    
    Returns:
    Detailed string representation of contents of this event, to help in logging and debugging.

Class Event

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

CREATE

MODIFY

MODIFY_METADATA

ADD

REMOVE

DELETE

INSTALL

SUBJECT_MASK

EVENT_MASK

Constructor Detail

Event

Event

Method Detail

equals

hashCode

setDispatcher

getObject

getSubject

getSubjectID

getObjectID

getSubjectType

getObjectType

getSubjectTypeAsString

getObjectTypeAsString

parseObjectType

getEventType

getEventTypeAsString

parseEventType

getTimeStamp

getDispatcher

getDetail

getTransactionID

setTransactionID

setCurrentUser

getCurrentUser

setExtraLogInfo

getExtraLogInfo

pass

setBitSet

getBitSet

toString