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public interface AccumulateFunction
An interface for accumulate external function implementations
| Method Summary | |
|---|---|
void |
accumulate(Serializable context,
Object value)
Executes the accumulation action |
Serializable |
createContext()
Creates and returns a new context object |
Object |
getResult(Serializable context)
Returns the current value in this accumulation session |
Class<?> |
getResultType()
Returns the class type of the result of this function |
void |
init(Serializable context)
Initializes the accumulator |
void |
reverse(Serializable context,
Object value)
Reverses the accumulation action |
boolean |
supportsReverse()
True if the function supports reverse. |
| Methods inherited from interface java.io.Externalizable |
|---|
readExternal, writeExternal |
| Method Detail |
|---|
Serializable createContext()
void init(Serializable context)
throws Exception
context -
Exception
void accumulate(Serializable context,
Object value)
context - value -
void reverse(Serializable context,
Object value)
throws Exception
context - value -
Exception
Object getResult(Serializable context)
throws Exception
context -
Exceptionboolean supportsReverse()
Class<?> getResultType()
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