org.apache.cayenne.event
Class EventSubject
java.lang.Object
   org.apache.cayenne.event.EventSubject
org.apache.cayenne.event.EventSubject
- All Implemented Interfaces: 
- Serializable
- public class EventSubject 
- extends Object- implements Serializable
This class encapsulates the String that is used to identify the subject that
 a listener is interested in. Using plain Strings causes several severe problems:
 
 - it's easy to misspell a subject, leading to undesired behaviour at runtime that is
 hard to debug.
- in systems with many different subjects there is no safeguard for defining the
 same subject twice for different purposes. This is especially true in a distributed
 setting.
 
- See Also:
- Serialized Form
| Constructor Summary | 
| protected  | EventSubject(String fullSubjectName)Protected constructor for new subjects.
 | 
 
 
 
EventSubject
protected EventSubject(String fullSubjectName)
- Protected constructor for new subjects.
 
- Parameters:
- fullSubjectName- the name of the new subject to be created
 
getSubject
public static EventSubject getSubject(Class<?> subjectOwner,
                                      String subjectName)
- Returns an event subject identified by the given owner and subject name.
 
- 
 
- 
- Parameters:
- subjectOwner- the Class used for uniquely identifying this subject
- subjectName- a String used as name, e.g. "MyEventTopic"
- Throws:
- IllegalArgumentException- if subjectOwner/subjectName are- nullor subjectName is empty.
 
equals
public boolean equals(Object obj)
- 
- Overrides:
- equalsin class- Object
 
- 
 
hashCode
public int hashCode()
- 
- Overrides:
- hashCodein class- Object
 
- 
 
getSubjectName
public String getSubjectName()
- 
 
- 
 
toString
public String toString()
- 
- Overrides:
- toStringin class- Object
 
- 
- Returns:
- a String in the form <ClassName 0x123456> SomeName
- See Also:
- Object.toString()
 
Copyright © 2001-2011 Apache Cayenne. All Rights Reserved.