Copy multiple dispatch vi to new child class

Hi, I have just started with LVOOP and while I'm pretty sure I have a good understanding of the overall theme, there is one problem I foresee if I continue.
Situation:
BoardType is parent of classes CC2600 and CC1300. Currently the child classes are just empty place holders.
Almost all the methods in the child classes will be of dynamic dispatch type (currently only one).
From what I understand a dynamic dispatch must be available in all child classes plus parent class in order to work as intended.
Problem:
If I would go forward and implementing LVOOP this would require approx 30 dynamic dispatch vis for each class. I can right click but for just these two children that's 60 + 30 vis I must create manually. I would much prefer just to create a template once and then just basically drag and drop 30+ new vis for each new class that is created.
Is there a way I can define a set of template dispatch vis in the parent BoardType and have them added to all the child classes?
I tried the save as copy, but the problem is that I still have to replace the connector pane to represent the new owning class.
If it helps here's a very basic block diagram of what's going to happen, just after Reset.vi there will be a lot of other dynamic dispatch vis.
Thanks in advance.
Michael

From the OP it sounded like you were literally just copying from the parent.
What I tend to do is finish one child class and then save a copy to a new name and change the internal data (if required) and DD vis (if required).
I do agree though that these kinds of operations could be hugely simplified using helper programs. Give the link provided by others a try.
Shane.
Say hello to my little friend.
RFC 2323 FHE-Compliant

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interface Selector<T> {
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package dispatch;
abstract class Base {
static interface Selector <T> {
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    T apply (C c);
static interface Functor1 <T> {
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static interface Functor2 <T> {
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public abstract <T> T accept (Selector<T> selector) ;
Base (int typeTag) { this.typeTag = typeTag; }
final int typeTag;
class A extends Base {
A (String value) {
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final String value;
public <T> T accept (Selector<T> selector) { return selector.apply(this); }
class B extends Base {
B (double value) {
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final double value;
public <T> T accept (Selector<T> selector) { return selector.apply(this); }
class C extends Base {
C (int value) {
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int value;
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public Base.Selector<String> apply (final C arg0){
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      return "CA"; // "DoubleDispatchSelector received C(" + arg0.value + ") A(" + arg1.value + ")";
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      case 0xBB: return apply((B)any0, (B)any1);
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      case 0xCA: return apply((C)any0, (A)any1);
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    return "AA"; // "DoubleDispatchOnTypeTags received A(" + arg0.value + ") A(" + arg1.value + ")";
public String apply (A arg0, B arg1) {
    return "AB"; // "DoubleDispatchOnTypeTags received A(" + arg0.value + ") B(" + arg1.value + ")";
public String apply (A arg0, C arg1) {
    return "AC"; // "DoubleDispatchOnTypeTags received A(" + arg0.value + ") C(" + arg1.value + ")";
public String apply (B arg0, A arg1) {
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    return "BB"; // "DoubleDispatchOnTypeTags received B(" + arg0.value + ") B(" + arg1.value + ")";
public String apply (B arg0, C arg1) {
    return "BC"; // "DoubleDispatchOnTypeTags received B(" + arg0.value + ") C(" + arg1.value + ")";
public String apply (C arg0, A arg1) {
    return "CA"; // "DoubleDispatchOnTypeTags received C(" + arg0.value + ") A(" + arg1.value + ")";
public String apply (C arg0, B arg1) {
    return "CB"; // "DoubleDispatchOnTypeTags received C(" + arg0.value + ") B(" + arg1.value + ")";
public String apply (C arg0, C arg1) {
    return "CC"; // "DoubleDispatchOnTypeTags received C(" + arg0.value + ") C(" + arg1.value + ")";
// test harness
public class Dispatch {
static Base[] items0 = { new A("red"),   new B(0.1), new C(1) };
static Base[] items1 = { new A("green"), new B(0.2), new C(2) };
static long time (Base.Functor2 functor, int iterations) {
    final long start = System.currentTimeMillis();
    for (int iter = 0; iter < iterations; ++iter)
      for (Base item0 : items0)
        for (Base item1 : items1)
          functor.apply(item0, item1);
    final long finish = System.currentTimeMillis();
    return finish - start;
public static void main (String ...args) throws Exception {
    int iterations = args.length > 0 ? Integer.parseInt(args[0]) : 100000;
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      System.out.println("DoubleDispatchSelector2: " + time(new DoubleDispatchSelector2(), iterations));
      System.out.println("DoubleDispatchOnTypeTags: " + time(new DoubleDispatchOnTypeTags(), iterations));
} The reason the string concatenations are commented out is that with that amount of work, it doesn't matter which one you use. If you have a lot less work in the methods, using tags is more efficient:
DoubleDispatchSelector1: 807
DoubleDispatchSelector2: 714
DoubleDispatchOnTypeTags: 281Deeper dispatches are possible, but N^^3 or more methods are rather a lot to handle. The typeTags variant gives direct access to the individual methods, which the selectors can be adjusted to do with an extra indirection. The typeTags variant isn't checked for type safety by the compiler.
Edited by: pm_kirkham on 01-Apr-2008 21:01

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Solved!
Go to Solution.

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Say hello to my little friend.
RFC 2323 FHE-Compliant

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mySearch.addSearchItem(myColorFieldDim,myTextConRed);
mySearch.addSearchItem(myColorFieldDim,myTextConBlue);
mySearch.addSearchItem(myColorFieldDim,myTextConGreen);
the question is how do I add the AND of the BooleanSearchConstraint?
FieldDimension myActiveFieldDim = new FieldDimension(<IsActive FieldId>);
BooleanSearchConstraint myBoolCon = new BooleanSearchConstraint(true);
I can't just add it to mySearch because mySearch is using OR operator, so it would return ALL of the Products records that match IsActive = true. I tried creating a higher level Search object like this:
Search topSearch = new Search(<Products TableId>);
topSearch.setComparisonOperator(Search.AND_OPERATOR);
topSearch.addSearchItem(mySearch);
topSearch.addSearchItem(myActiveFieldDim,myBoolCon);
But when I do this I get the above "Search group nesting is currently not supported" error. Does that mean this kind of search cannot be done with the new MDM API?

I'm actually testing a pre-release of SP05 right now, and it still is not functional. The best that can be done is to use a PickListSearchConstraint to act as an OR within a field. But PickList is limited to lookup Id values, text attribute values, numeric attribute values and coupled attribute values. It works for me in some cases where I have lookup Id values, but not in other cases where the users want to search on multiple text values within a single field.

Easy One: Constructor of Child Classes

Hello. I am new to the java language and i have a question.
I want to make a Class Vehicle which should have the following variables
static int id;
static long color;
static String brand;
static Boolean rented;
static String location;
Now i want to make a Child class called 'Car' which should have the .location set to "land" by default.
I want to also make a Child class of 'Car' called 'Bus' .
Now the problem is with the constructors. I want that when i create a class Bus that the .location is set to "land" automatically and not with user input. This means it will call the constructor of 'Car' and not 'Vehicle' which sets .location to "land"
I tried to do so but it tells me 'Constructor Car() was not found' .
I want the constructor of Car define the .location="land" but the constructor of Bus will not have the .location argument because
it is set to "land" by default?
Please help !
thanks
code follows:
package map_exercise;
* Title:
* Description:
* Copyright: Copyright (c) 2003
* Company:
* @author
* @version 1.0
public class Vehicle {
static int id;
static long color;
static String brand;
static Boolean rented;
static String location;
public Vehicle(int myid,long mycolor,String mybrand,Boolean isrented,String mylocation) {
this.id=myid;
this.color=mycolor;
this.brand=mybrand;
this.rented=isrented;
this.location=mylocation;
package map_exercise;
* Title:
* Description:
* Copyright: Copyright (c) 2003
* Company:
* @author
* @version 1.0
public class Car extends Vehicle {
public Car(int myid,long mycolor,String mybrand,Boolean isrented) {
super(myid,mycolor,mybrand,isrented,"land");
package map_exercise;
* Title:
* Description:
* Copyright: Copyright (c) 2003
* Company:
* @author
* @version 1.0
public class Bus extends Car {
public Bus(int myid,long mycolor,String mybrand,Boolean isrented) {
}

I agree with NadjaS about the general remarks on the use of static vs. instance variables.
Anyway, if you really need to keep the variables at the class definition level, you can initialize them through the static initializer constructor within the "Car" class itself, i.e. something like this:
public class Car extends Vehicle {
static {
location = "land";
}without necessarily calling the super constructor.
The message "Constructor Car() was not found" is due to the fact the the only Car class constructor has four parameters - hence a completely different signature - and there is no constructor without parameters at all.
Hope this will help.
Bye

Casting parent class to a child class

Hi,
I have a static method which returns a class called parent. Now I want to cast it it's child class. There are no compilation errors, but at runtime it's throwing me ClassCastException. This is what I'm doing.
public Parent getObject() {
Parent p = new Parent();
return p;
Child c = (Child) getObject();What is wrong with this code? I couldn't figure it out.
Any help will be appreciated.
Thanks,

Parent p1 = new Parent(); // 1
Parent p2 = new Child(); // 2
Child c1 = new Parent(); // 3
Child c2 = new Child(); // 4
Parent p1 = (Parent)c1; // 5
Parnet p2 = (Parent)c2; // 6
Child c3 = (Child)p1; // 7
Child c4 = (Child)p2; // 81: Ok.
2: Ok. Every Child IS-A parent.
3: Compile time error. A Parent object is not a Child.
4: Ok.
5: Ok, because every Child IS-A parent, and the cast is unnecessary. (Though since 3 is illegal a compile time we wouldn't actually have this situation.)
6: Ok, and the cast is unnecessary, because every Child IS-A Parent.
7: ClassCastException at runtime. The object is not a Child.
8: Ok.

Copy multiple dispatch vi to new child class

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