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public interface ValueHolder
Provides a level of indirection for property value access, most often used for deferred faulting of to-one relationships. A ValueHolder abstracts how a property value is obtained (fetched from DB, etc.), thus simplifying design of an object that uses it.
Here is an example of a bean property implemented using ValueHolder:
protected ValueHolder someProperty; public SomeClass getSomeProperty() { return (SomeClass) somePropertyHolder.getValue(SomeClass.class); } public void setSomeProperty(SomeClass newValue) { somePropertyHolder.setValue(SomeClass.class, newValue); }
Method Summary | |
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java.lang.Object |
getValue()
Returns an object stored by this ValueHolder. |
java.lang.Object |
getValueDirectly()
Retrieves ValueHolder value without triggering fault resolution. |
void |
invalidate()
Turns a ValueHolder into a fault. |
boolean |
isFault()
Returns true if the internal value is not yet resolved. |
java.lang.Object |
setValue(java.lang.Object value)
Sets an object stored by this ValueHolder. |
java.lang.Object |
setValueDirectly(java.lang.Object value)
Sets ValueHolder vaue without triggering fault resolution. |
Method Detail |
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java.lang.Object getValue() throws CayenneRuntimeException
CayenneRuntimeException
java.lang.Object getValueDirectly() throws CayenneRuntimeException
CayenneRuntimeException
java.lang.Object setValue(java.lang.Object value) throws CayenneRuntimeException
value
- a new value of the ValueHolder.
CayenneRuntimeException
java.lang.Object setValueDirectly(java.lang.Object value) throws CayenneRuntimeException
CayenneRuntimeException
boolean isFault()
void invalidate()
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