Container to bindata, and back again

I was recently engaged in a bug where the size of container caused problems. The solution we arrived at was to implement compression of the container. The solution is trivial; but the APIs to get there took me a while to discover, and as I couldn’t find any other post on this, I’m sharing it.

How to implement compression/decompression of pack/unpack methods using BinData and ContainerClass.

public container pack() 

{

    // Business as usual…  

    container result = [#currentVersion, #currentList]; 

    // Compress  

    ContainerClass containerClass = new ContainerClass(result);  

    binData = new BinData();  

    binData.setData(containerClass.toBlob());  

    binData.compressLZ77(12);  

    return binData.getData();  

}  

1. public boolean unpack(container  _compressed)  
   
2. {
   
3.     // Decompress          
   
4.     BinData  binData  =  new  BinData();        
   
5.     binData.setData(_compressed);        
   
6.     binData.decompressLZ77();        
   
7.     container packed = ContainerClass::blob2Container(binData.getData());
   
8.  
9.     // Business as usual…          
   
10.     Version version = RunBase::getVersion(packed);        
    
11.     switch (version)
    
12.      {            
    
13.         case #CurrentVersion:  
    
14.              [version, #currentList] = packed;                
    
15.             break;            
    
16.         default:  
    
17.             return false;        
    
18.     }        
    
19.     return true;    
    
20. }    
    

     

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