io.airlift.parameternames

Class ParameterNames

java.lang.Object

io.airlift.parameternames.ParameterNames

public final class ParameterNames
extends Object

ParameterNames contains utility methods for fetching the parameter names for a method or constructor compiled into the class file using the -parameters flag to javac or from the debug symbols in the class file.

Method Summary

Modifier and Type	Method and Description
static List<String>	getParameterNames(Executable executable) Gets the parameter names of the method or constructor.
static Optional<List<String>>	getParameterNamesFromBytecode(Executable executable) Gets the parameter names of the method or constructor from the debug symbols in the bytecode.
static Optional<List<String>>	tryGetParameterNames(Executable executable) Tries to get meaningful parameter names of the method or constructor.

Methods inherited from class java.lang.Object

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

Method Detail

tryGetParameterNames

public static Optional<List<String>> tryGetParameterNames(Executable executable)

Tries to get meaningful parameter names of the method or constructor. If the parameters were compiled into the class file using the -parameters flag to javac, the parameters are fetch via Java reflection. Otherwise, the parameters are read from the debug symbols in the class file. If the method does not have debug symbols, empty result is returned.

Parameters:

executable - the method or constructor

Returns:

the parameter names

getParameterNames

public static List<String> getParameterNames(Executable executable)

Gets the parameter names of the method or constructor. If the parameters were compiled into the class file using the -parameters flag to javac, the parameters are fetch via Java reflection. Otherwise, the parameters are read from the debug symbols in the class file. If the method does not have debug symbols, the default parameter names argN are returned.

Parameters:

executable - the method or constructor

Returns:

the parameter names

getParameterNamesFromBytecode

public static Optional<List<String>> getParameterNamesFromBytecode(Executable executable)

Gets the parameter names of the method or constructor from the debug symbols in the bytecode. Note that, abstract methods and interface methods do not have bytecode, and therefore, there have no debug symbols to read.

Parameters:

executable - the method or constructor

Returns:

the parameter names if debug symbols were present