Object的使用技巧

当对象转换为object之后可以调用任一方法，而且编译器不会报错。这样有利全用args.caller()传递对象到目标后，在目标方利用object转换后调用caller中的方法

boolean useConvertableLookup(Object caller)

{

    InventMovement          inventMovement;

    InventTableModule       inventTableModule;

    PriceDiscTable          priceDiscTable;

    SuppItemTable           suppItemTable;

    fieldId                 itemIdField;

    ;

    if (!element.args() || !element.args().caller())

        return false;

 

    if (caller.name() == formstr(UnitConversion))

    {

        otherUnit = caller.otherUnit();

        selectedItemId = caller.selectedItemId();

        if (selectedItemId && !otherUnit)

            this.buildConversionConvertable();

        else

            this.buildConvertable();

        return true;

    }

 

 

    if (caller.name() == formstr(InventOnHandMovement)      ||

        caller.name() == formstr(InventOnHandItem)          ||

        caller.name() == formstr(InventOnHandReserve)       ||

        caller.name() == formstr(WMSPickingLinePick))

    {

        otherUnit = caller.otherUnit();

        selectedItemId = caller.selectedItemId();

        this.buildConvertable();

        return true;

    }

 

    if (element.args().dataset())

    {

        switch(element.args().dataset())

        {

            case tablenum(InventTableModule):

                inventTableModule = element.args().record();

                switch(inventTableModule.ModuleType)

                {

                    case ModuleInventPurchSales::Invent:

                        return false;

                    default:

                        selectedItemId = inventTableModule.ItemId;

                        otherUnit = InventTable::find(selectedItemId).inventUnitId();

                        this.buildConvertable();

                        return true;

                }

            case tablenum(PriceDiscTable):

                priceDiscTable = element.args().record();

                if (priceDiscTable.ItemCode != TableGroupAll::Table)

                    return false;

 

                selectedItemId = priceDiscTable.ItemRelation;

                if (!selectedItemId)

                    return false;

 

                otherUnit = InventTable::find(selectedItemId).inventUnitId();

                this.buildConvertable();

                return true;

            case tablenum(SuppItemTable):

                suppItemTable = element.args().record();

                if (suppItemTable.ItemCode != TableGroupAll::Table)

                    return false;

 

                selectedItemId = suppItemTable.ItemRelation;

                if (!selectedItemId)

                    return false;

 

                otherUnit = InventTable::find(selectedItemId).inventUnitId();

                this.buildConvertable();

                return true;

            default:

                itemIdField = fieldname2id(element.args().dataset(),fieldstr(InventTable,ItemId));

                if (itemIdField)

                {

                    selectedItemId = element.args().record().(itemIdField);

                    if (!selectedItemId)

                        return false;

 

                    otherUnit = InventTable::find(selectedItemId).inventUnitId();

                    this.buildConvertable();

                    return true;

                }

                break;

        }

    }

 

    if (element.args().dataset())

    {

        inventMovement = InventMovement::constructNoThrow(element.args().record());

        if (inventMovement)

        {

            selectedItemId = inventMovement.itemId();

            otherUnit = InventTable::find(selectedItemId).inventUnitId();

            this.buildConvertable();

            return true;

        }

    }

    return false;

}