Java Code Examples for org.luaj.vm2.LuaValue#isnil()

public LuaValue call(LuaValue e, LuaValue base) {
	if (base.isnil())
		return e.tonumber();
	final int b = base.checkint();
	if ( b < 2 || b > 36 )
		argerror(2, "base out of range");
	return e.checkstring().tonumber(b);
}
 

public Object coerce(LuaValue value) {
	if ( value.isnil() )
		return null;
	if ( targetType == TARGET_TYPE_STRING )
		return value.tojstring();
	LuaString s = value.checkstring();
	byte[] b = new byte[s.m_length];
	s.copyInto(0, b, 0, b.length);
	return b;
}
 

public Varargs invoke(Varargs args) {
	LuaString name = args.checkstring(1);
	LuaValue val = package_.get(_PRELOAD).get(name);
	return val.isnil()? 
		valueOf("\n\tno field package.preload['"+name+"']"):
		val;
}
 

public void onWindowFocusChanged(boolean hasWindowFocus) {
	LuaValue f = globals.get("onWindowFocusChanged");
	if (!f.isnil())
		try {
			f.call(CoerceJavaToLua.coerce(hasWindowFocus));
		} catch (Exception e) {
			e.printStackTrace();
		}
}
 

public boolean onTrackballEvent(MotionEvent event) {
	LuaValue f = globals.get("onTrackballEvent");
	if (!f.isnil())
		try {
			return f.call(CoerceJavaToLua.coerce(event)).toboolean();
		} catch (Exception e) {
			e.printStackTrace();
			return true;
		}
	else
		return super.onTrackballEvent(event);
}
 

public static Object convertToJava(Class<?> c, LuaValue o) {
  if (o == null || o.isnil()) return null;
  LuaConverter luaConverter = converter(c);
  if (luaConverter == null) {
    if (o instanceof LuaObject) {
      luaConverter = map.get(Object.class);
    } else {
      throw new ConversionError("Cannot convert Lua to Java: " + c.getName());
    }
  }
  return luaConverter.toJava(o, c);
}
 

public boolean onKeyUp(int keyCode, KeyEvent event) {
	LuaValue f = globals.get("onKeyUp");
	if (!f.isnil())
		try {
			return f.call(CoerceJavaToLua.coerce(keyCode),
					CoerceJavaToLua.coerce(event)).toboolean();
		} catch (Exception e) {
			e.printStackTrace();
			return true;
		}
	else
		return super.onKeyUp(keyCode, event);
}
 

public LuaValue call(LuaValue arg) {
	LuaValue h = arg.metatag(TOSTRING);
	if ( ! h.isnil() ) 
		return h.call(arg);
	LuaValue v = arg.tostring();
	if ( ! v.isnil() ) 
		return v;
	return valueOf(arg.tojstring());
}
 

public LuaValue call(LuaValue e, LuaValue base) {
	if (base.isnil())
		return e.tonumber();
	final int b = base.checkint();
	if ( b < 2 || b > 36 )
		argerror(2, "base out of range");
	return e.checkstring().tonumber(b);
}
 

/**
 * 调用Header函数
 *
 * @return
 */
public UDView setHeader(LuaValue header) {
     T lv = getView();
    if (lv instanceof ILVListView) {
        if (header instanceof UDView) {
            mHeader = header;
            ((ILVListView) lv).addHeader(((UDView) header).getView());
        } else if (header == null || header.isnil()) {
            mHeader = NIL;
            ((ILVListView) lv).removeHeader();
        }
    }
    return this;
}
 

/**
 * 注册一个名称到该lua对象的命名空间中
 *
 * @param luaName
 * @param clazz
 * @return
 */
public synchronized LuaViewCore registerPanel(String luaName, Class<? extends LVCustomPanel> clazz) {
    if (mGlobals != null && !TextUtils.isEmpty(luaName) && (clazz != null && clazz.getSuperclass() == LVCustomPanel.class)) {
        LuaValue value = mGlobals.get(luaName);
        if (value == null || value.isnil()) {
            mGlobals.tryLazyLoad(new UICustomPanelBinder(clazz, luaName));
        }
    }
    return this;
}
 

private Item applyOnItem(int cell,String effect) {
    LuaValue ret = script.run(effect, cell);
    if(ret.isnil()) {
        return null;
    }

    Item item = (Item) ret.checkuserdata(Item.class);
    item.quantity(quantity());
    return item;
}
 

public LuaValue call(LuaValue e, LuaValue base) {
    if (base.isnil())
        return e.tonumber();
     int b = base.checkint();
    if (b < 2 || b > 36)
        argerror(2, "base out of range");
    return e.checkstring().tonumber(b);
}
 

public Varargs invoke(Varargs args) {
	LuaString name = args.checkstring(1);
	LuaValue val = package_.get(_PRELOAD).get(name);
	return val.isnil()? 
		valueOf("\n\tno field package.preload['"+name+"']"):
		val;
}
 

public LuaValue call(LuaValue arg) {
    LuaValue h = arg.metatag(TOSTRING);
    if (!h.isnil()) {
        return h.call(arg);
    }
    LuaValue v = arg.tostring();
    if (!v.isnil()) {
        return v;
    }
    return valueOf(arg.tojstring());
}
 

public Varargs _io_input(LuaValue file) {
	infile = file.isnil()? input():
			file.isstring()? ioopenfile(FTYPE_NAMED, file.checkjstring(),"r"):
			checkfile(file);
	return infile;
}
 

public LuaValue call(LuaValue arg1, LuaValue arg2) {
	throw arg1.isnil()? new LuaError(null, arg2.optint(1)): 
		arg1.isstring()? new LuaError(arg1.tojstring(), arg2.optint(1)): 
			new LuaError(arg1);
}
 

public Varargs _io_output(LuaValue filename) {
	outfile = filename.isnil()? output(): 
			  filename.isstring()? ioopenfile(FTYPE_NAMED, filename.checkjstring(),"w"):
			  checkfile(filename);
	return outfile;
}
 

public Varargs _io_output(LuaValue filename) {
	outfile = filename.isnil()? output(): 
			  filename.isstring()? ioopenfile(FTYPE_NAMED, filename.checkjstring(),"w"):
			  checkfile(filename);
	return outfile;
}
 

/**
 * 是否有某个函数
 *
 * @param cellId
 * @param method
 * @return
 */
public boolean hasCellFunction(String cellId, String method) {
     LuaValue methodData = getCell(cellId);
    return !methodData.isnil() && methodData.get(method) != null && methodData.get(method).isfunction();
}