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java.lang.Objectorg.sqlite.callback.Callback
org.sqlite.callback.NamedCallback
org.sqlite.udf.Function
org.sqlite.udf.AggregateFunction<T>
public abstract class AggregateFunction<T>
User-Defined aggregate function class.
JdbcConnection.createFunction(Function),
JdbcConnection.dropFunction(Function)| Field Summary | |
|---|---|
protected java.lang.ThreadLocal<T> |
tls
thread local storage |
| Fields inherited from class org.sqlite.udf.Function |
|---|
argc |
| Constructor Summary | |
|---|---|
AggregateFunction(java.lang.String name)
create aggregate function object. |
|
AggregateFunction(java.lang.String name,
int argc)
create aggregate function object. |
|
AggregateFunction(java.lang.String name,
int argc,
int enc)
create aggregate function object. |
|
| Method Summary | |
|---|---|
protected T |
get()
Returns the value in the current thread's copy of this thread-local variable. |
protected abstract T |
initialValue()
Returns the current thread's "initial value" for this thread-local variable. |
protected void |
remove()
Removes the current thread's value for this thread-local variable. |
protected void |
set(T value)
Sets the current thread's copy of this thread-local variable to the specified value. |
protected abstract void |
xFinal(Context ctx)
|
protected void |
xFinal(long context)
Called from the sqlite3_step() function. |
protected void |
xFunc(Context ctx)
invoke xStep() method. |
protected abstract void |
xStep(Context ctx)
|
| Methods inherited from class org.sqlite.udf.Function |
|---|
getArgumentCount, register, unregister, xFunc |
| Methods inherited from class org.sqlite.callback.NamedCallback |
|---|
getEncoding, getName |
| Methods inherited from class org.sqlite.callback.Callback |
|---|
delete, isRegistered |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Field Detail |
|---|
protected final java.lang.ThreadLocal<T> tls
| Constructor Detail |
|---|
public AggregateFunction(java.lang.String name)
name - the function nameFunction.Function(java.lang.String)
public AggregateFunction(java.lang.String name,
int argc)
name - the function nameargc - the number of arguments that the aggregate takes.Function.Function(java.lang.String, int)
public AggregateFunction(java.lang.String name,
int argc,
int enc)
name - the function nameargc - the number of arguments that the aggregate takes.enc - the specifies what text encoding this function prefers for its parametersFunction.Function(java.lang.String, int, int)| Method Detail |
|---|
protected final void xFunc(Context ctx)
throws java.sql.SQLException
xFunc in class Functionctx - sqlite3_context wrapper object
java.sql.SQLExceptionxStep(org.sqlite.udf.Context)protected final void xFinal(long context)
context - xFinal(org.sqlite.udf.Context)protected abstract T initialValue()
ThreadLocal.initialValue()protected T get()
ThreadLocal.get()protected void remove()
ThreadLocal.remove()protected void set(T value)
value - the value to be stored in the current thread's copy of this thread-local.ThreadLocal.set(Object)
protected abstract void xStep(Context ctx)
throws java.sql.SQLException
java.sql.SQLException
protected abstract void xFinal(Context ctx)
throws java.sql.SQLException
java.sql.SQLException
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