integer wrappers for Swarm Maps: did I miss something?

[Paul Johnson]

Ok, so I'm writing more swarm user guide and I come to Maps.  It seems
to me that if you use an Integer wrapper class to put things into a Map,
you also need to maintain an Array of the Integer objects so you can
retrieve things from the Map when you want them.  Not so?  

Here is the example code:


An Integer wrapper class (ripped off from Marcus's test program
comparing Set and List):

//Integer.h
#import <defobj/Create.h>

@interface Integer: CreateDrop
{
int value;
member_t link;
}
- setValue: (int)value;
- (int)getValue;
@end

//Integer.m
@implementation Integer
- setValue: (int)theValue
{
value = theValue;
return self;
}

- (int)getValue
{
return value;
}

@end

And suppose we use that class to wrap integers, as in this code snippet:

#include Integer.h
#include Preference

//Suppose this is in the middle of a buildObjects method ...

id <Array> arrayOfIntegers;
id <Map> mapOfPreferences;

//This will contain the integer wrapper objects
arrayOfIntegers=[Array create: [self getZone] setCount: 50];

for(i=0; i < 50; i++)
{
  id aPreference;

  aPreference = [Preference createBegin: [self getZone]];
  aPreference = [aPreference createEnd];

  anInteger = [[Integer createBegin: [self getZone] setValue: i]
createEnd];

  [arrayOfIntegers atOffset: i put: anInteger];
  
  [mapOfPreferences at: anInteger insert: aPreference];
}

// When you want the item from the map with integer value 15, you have
to do:

   anInteger = [arrayOfIntegers atOffset: 15];
   objectYouWanted = [mapOfPreferences at: anInteger];


Is there a simpler way to do this?


-- 
Paul E. Johnson                       email: address@hidden
Dept. of Political Science            http://lark.cc.ukans.edu/~pauljohn
University of Kansas                  Office: (785) 864-9086
Lawrence, Kansas 66045                FAX: (785) 864-5700

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