org.apache.drill.exec.expr.fn

Class FunctionInitializer

java.lang.Object

org.apache.drill.exec.expr.fn.FunctionInitializer

public class FunctionInitializer
extends Object

To avoid the cost of initializing all functions up front, this class contains all information required to initializing a function when it is used.

Constructor Summary

Constructors

Constructor and Description
FunctionInitializer(String className, ClassLoader classLoader)

Method Summary

Modifier and Type	Method and Description
ClassLoader	getClassLoader()
String	getClassName()
List<String>	getImports()
String	getMethod(String methodName)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FunctionInitializer

public FunctionInitializer(String className,
                           ClassLoader classLoader)

Parameters:

className - the fully qualified name of the class implementing the function

classLoader - class loader associated with the function, is unique for each jar that holds function to prevent classpath collisions during loading an unloading jars

Method Detail

getClassLoader

public ClassLoader getClassLoader()

Returns:

returns class loader

getClassName

public String getClassName()

Returns:

the fully qualified name of the class implementing the function

getImports

public List<String> getImports()

Returns:

the imports of this class (for java code gen)

getMethod

public String getMethod(String methodName)

Parameters:

methodName - method name

Returns:

the content of the method (for java code gen inlining)