org.luaj.vm2.lib
Class ZeroArgFunction

java.lang.Object
  org.luaj.vm2.Varargs
      org.luaj.vm2.LuaValue
          org.luaj.vm2.LuaFunction
              org.luaj.vm2.lib.LibFunction
                  org.luaj.vm2.lib.ZeroArgFunction

public abstract class ZeroArgFunction
extends LibFunction

Abstract base class for Java function implementations that take no arguments and return one value.

Subclasses need only implement LuaValue.call() to complete this class, simplifying development. All other uses of call(LuaValue), invoke(Varargs),etc, are routed through this method by this class.

If one or more arguments are required, or variable argument or variable return values, then use one of the related function OneArgFunction, TwoArgFunction, ThreeArgFunction, or VarArgFunction.

See LibFunction for more information on implementation libraries and library functions.

See Also:

call(), LibFunction, OneArgFunction, TwoArgFunction, ThreeArgFunction, VarArgFunction

Field Summary

Fields inherited from class org.luaj.vm2.lib.LibFunction

name, opcode

Fields inherited from class org.luaj.vm2.LuaFunction

env, s_metatable

Fields inherited from class org.luaj.vm2.LuaValue

ADD, CALL, CONCAT, DIV, EMPTYSTRING, EQ, FALSE, INDEX, LE, LEN, LT, METATABLE, MINUSONE, MOD, MODE, MUL, NEWINDEX, NIL, NILS, NONE, NOVALS, ONE, POW, SUB, TBOOLEAN, TFUNCTION, TINT, TLIGHTUSERDATA, TNIL, TNONE, TNUMBER, TOSTRING, TRUE, TSTRING, TTABLE, TTHREAD, TUSERDATA, TVALUE, TYPE_NAMES, UNM, ZERO

Constructor Summary

ZeroArgFunction()
Default constructor

ZeroArgFunction(LuaValue env)
Constructor with specific environment

Method Summary

abstract LuaValue	call() Call this with 0 arguments, including metatag processing, and return only the first return value.
LuaValue	call(LuaValue arg) Call this with 1 argument, including metatag processing, and return only the first return value.
LuaValue	call(LuaValue arg1, LuaValue arg2) Call this with 2 arguments, including metatag processing, and return only the first return value.
LuaValue	call(LuaValue arg1, LuaValue arg2, LuaValue arg3) Call this with 3 arguments, including metatag processing, and return only the first return value.
Varargs	invoke(Varargs varargs) Call this with variable arguments, including metatag processing, and retain all return values in a Varargs.

Methods inherited from class org.luaj.vm2.lib.LibFunction

bind, bind, newupe, newupl, newupn, tojstring

Methods inherited from class org.luaj.vm2.LuaFunction

checkfunction, getfenv, getmetatable, isfunction, optfunction, setfenv, type, typename

Methods inherited from class org.luaj.vm2.LuaValue

add, add, add, and, arg, arg1, argerror, argerror, aritherror, aritherror, arithmt, arithmtwith, assert_, buffer, callmt, checkboolean, checkclosure, checkdouble, checkint, checkinteger, checkjstring, checklong, checkmetatag, checknotnil, checknumber, checknumber, checkstring, checktable, checkthread, checkuserdata, checkuserdata, checkvalidkey, compareerror, compareerror, comparemt, concat, concat, concatmt, concatTo, concatTo, concatTo, div, div, div, divInto, eq_b, eq, eqmtcall, equals, error, get, get, get, getn, gettable, gt_b, gt_b, gt_b, gt, gt, gt, gteq_b, gteq_b, gteq_b, gteq, gteq, gteq, illegal, inext, invoke, invoke, invoke, invoke, invoke, invokemethod, invokemethod, invokemethod, invokemethod, invokemethod, invokemethod, isboolean, isclosure, isint, isinttype, islong, isnil, isnumber, isstring, istable, isthread, isuserdata, isuserdata, isweaknil, len, lenerror, length, listOf, listOf, load, lt_b, lt_b, lt_b, lt, lt, lt, lteq_b, lteq_b, lteq_b, lteq, lteq, lteq, metatag, method, method, method, method, method, method, mod, mod, mod, modFrom, mul, mul, mul, narg, neg, neq_b, neq, next, not, onInvoke, optboolean, optclosure, optdouble, optint, optinteger, optjstring, optlong, optnumber, optstring, opttable, optthread, optuserdata, optuserdata, optvalue, or, pow, pow, pow, powWith, powWith, presize, raweq, raweq, raweq, raweq, raweq, rawget, rawget, rawget, rawset, rawset, rawset, rawset, rawset, rawset, rawset, rawsetlist, set, set, set, set, set, set, set, setmetatable, settable, strcmp, strcmp, strongkey, strongvalue, strvalue, sub, sub, sub, subFrom, subFrom, tableOf, tableOf, tableOf, tableOf, tableOf, tableOf, tailcallOf, testfor_b, toboolean, tobyte, tochar, todouble, tofloat, toint, tolong, tonumber, toshort, tostring, toString, touserdata, touserdata, typerror, unimplemented, userdataOf, userdataOf, valueOf, valueOf, valueOf, valueOf, valueOf, valueOf, varargsOf, varargsOf, varargsOf, varargsOf, varargsOf, varargsOf

Methods inherited from class org.luaj.vm2.Varargs

argcheck, checkboolean, checkclosure, checkdouble, checkfunction, checkint, checkinteger, checkjstring, checklong, checknotnil, checknumber, checkstring, checktable, checkthread, checkuserdata, checkuserdata, checkvalue, eval, isfunction, isnil, isnoneornil, isnumber, isstring, istable, isTailcall, isthread, isuserdata, isvalue, optboolean, optclosure, optdouble, optfunction, optint, optinteger, optjstring, optlong, optnumber, optstring, opttable, optthread, optuserdata, optuserdata, optvalue, subargs, toboolean, tobyte, tochar, todouble, tofloat, toint, tojstring, tolong, toshort, touserdata, touserdata, type

Methods inherited from class java.lang.Object

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

Constructor Detail

ZeroArgFunction

public ZeroArgFunction()

Default constructor

ZeroArgFunction

public ZeroArgFunction(LuaValue env)

Constructor with specific environment

Parameters:

env - The environment to apply during constructon.

Method Detail

call

public abstract LuaValue call()

Description copied from class: LuaValue

Call this with 0 arguments, including metatag processing, and return only the first return value.

If this is a LuaFunction, call it, and return only its first return value, dropping any others. Otherwise, look for the CALL metatag and call that.

If the return value is a Varargs, only the 1st value will be returned. To get multiple values, use LuaValue.invoke() instead.

To call this as a method call, use LuaValue.method(LuaValue) instead.

Overrides:

call in class LuaValue

Returns:

First return value (this()), or NIL if there were none.

See Also:

LuaValue.call(LuaValue), LuaValue.call(LuaValue,LuaValue), LuaValue.call(LuaValue, LuaValue, LuaValue), LuaValue.invoke(), LuaValue.method(String), LuaValue.method(LuaValue)

call

public LuaValue call(LuaValue arg)

Description copied from class: LuaValue

Call this with 1 argument, including metatag processing, and return only the first return value.

If this is a LuaFunction, call it, and return only its first return value, dropping any others. Otherwise, look for the CALL metatag and call that.

If the return value is a Varargs, only the 1st value will be returned. To get multiple values, use LuaValue.invoke() instead.

To call this as a method call, use LuaValue.method(LuaValue) instead.

Overrides:

call in class LuaValue

Parameters:

arg - First argument to supply to the called function

Returns:

First return value (this(arg)), or NIL if there were none.

See Also:

LuaValue.call(), LuaValue.call(LuaValue,LuaValue), LuaValue.call(LuaValue, LuaValue, LuaValue), #invoke(LuaValue), LuaValue.method(String,LuaValue), LuaValue.method(LuaValue,LuaValue)

call

public LuaValue call(LuaValue arg1,
                     LuaValue arg2)

Description copied from class: LuaValue

Call this with 2 arguments, including metatag processing, and return only the first return value.

If this is a LuaFunction, call it, and return only its first return value, dropping any others. Otherwise, look for the CALL metatag and call that.

If the return value is a Varargs, only the 1st value will be returned. To get multiple values, use LuaValue.invoke() instead.

To call this as a method call, use LuaValue.method(LuaValue) instead.

Overrides:

call in class LuaValue

Parameters:

arg1 - First argument to supply to the called function

arg2 - Second argument to supply to the called function

Returns:

First return value (this(arg1,arg2)), or NIL if there were none.

See Also:

LuaValue.call(), LuaValue.call(LuaValue), LuaValue.call(LuaValue, LuaValue, LuaValue), #invoke(LuaValue,LuaValue), LuaValue.method(String,LuaValue,LuaValue), LuaValue.method(LuaValue,LuaValue,LuaValue)

call

public LuaValue call(LuaValue arg1,
                     LuaValue arg2,
                     LuaValue arg3)

Description copied from class: LuaValue

Call this with 3 arguments, including metatag processing, and return only the first return value.

If this is a LuaFunction, call it, and return only its first return value, dropping any others. Otherwise, look for the CALL metatag and call that.

If the return value is a Varargs, only the 1st value will be returned. To get multiple values, use LuaValue.invoke() instead.

To call this as a method call, use LuaValue.method(LuaValue) instead.

Overrides:

call in class LuaValue

Parameters:

arg1 - First argument to supply to the called function

arg2 - Second argument to supply to the called function

arg3 - Second argument to supply to the called function

Returns:

First return value (this(arg1,arg2,arg3)), or NIL if there were none.

See Also:

LuaValue.call(), LuaValue.call(LuaValue), LuaValue.call(LuaValue, LuaValue), #invoke(LuaValue,LuaValue, LuaValue), LuaValue.invokemethod(String,Varargs), LuaValue.invokemethod(LuaValue,Varargs)

invoke

public Varargs invoke(Varargs varargs)

Description copied from class: LuaValue

Call this with variable arguments, including metatag processing, and retain all return values in a Varargs.

If this is a LuaFunction, call it, and return all values. Otherwise, look for the CALL metatag and call that.

To get a particular return value, us Varargs.arg(int)

To call this as a method call, use LuaValue.invokemethod(LuaValue) instead.

Overrides:

invoke in class LuaValue

Parameters:

varargs - Varargs containing the arguments to supply to the called function

Returns:

All return values as a Varargs instance.

See Also:

LuaValue.varargsOf(LuaValue[]), LuaValue.call(LuaValue), LuaValue.invoke(), LuaValue.invoke(LuaValue,Varargs), LuaValue.invokemethod(String,Varargs), LuaValue.invokemethod(LuaValue,Varargs)