Main Page | Packages | Class Hierarchy | Class List | Directories | File List | Class Members | Related Pages

DBBlob2Array Class Reference

List of all members.

Detailed Description

Utility class to convert from sql blob types stored in the DB into Vectors Only Integer implemented at the moment, as that's all I need.

Author:
J. Monk

Definition at line 14 of file DBBlob2Array.java.


Static Public Member Functions

Vector< Integer > getInteger (Blob blob) throws SQLException
byte[] byteMe (Vector< Integer > intArray)
byte[] byteMe (Object obj)
Object convert (Blob blob, Class cl) throws SQLException

Member Function Documentation

byte [] byteMe (  Object  obj  )  [static]
 

Returns a byte array from any object. Only implemented Vector<Integer> at the moment

Definition at line 88 of file DBBlob2Array.java.

00088                                            {
00089     return(byteMe( (Vector<Integer>)obj  ));
00090     }

byte [] byteMe (  Vector< Integer >  intArray  )  [static]
 

Returns a byte array from a vector of integers

Definition at line 64 of file DBBlob2Array.java.

00064                                                          {
00065 
00066     byte byteArray[] = new byte[intArray.size()*4];
00067 
00068     int kk=0;
00069 
00070     for(int ii=0; ii!= intArray.size(); ++ii){
00071         int anInt = intArray.get(ii);
00072         for(int jj=0; jj!=4; ++jj){
00073         byteArray[kk] = (new Integer(anInt)).byteValue();
00074         anInt>>=8;
00075         ++kk;
00076         }
00077     }
00078 
00079     return(byteArray);
00080     }

Object convert (  Blob  blob,
Class  cl
)  throws SQLException [static]
 

Convert a blob into an object of the given class. only implemented Vector<Integer> at present

Parameters:
blob the blob to convert
cl the Class to convert to

Definition at line 102 of file DBBlob2Array.java.

00103                            {
00104 
00105     if(cl.equals(Vector.class)){
00106         return(getInteger(blob));
00107     }else if (cl.equals(Blob.class)){
00108         return(blob);
00109     }else{
00110 
00111         System.out.println("Can only convert Blobs to vectors and blobs");
00112         System.out.println("you attempted to convert a blob to a "+
00113                    cl.getName());
00114 
00115         return(null);
00116     }
00117     }

Vector<Integer> getInteger (  Blob  blob  )  throws SQLException [static]
 

Returns a vector of Integers from a blob

Definition at line 19 of file DBBlob2Array.java.

00020                        {
00021 
00022     Vector<Integer> column = null;
00023 
00024     if(blob==null)return column;
00025 
00026     byte theBytes[] = blob.getBytes((long)1, (int)blob.length());
00027 
00028     column = new Vector<Integer>();
00029 
00030     //check that we have a multiple of 4 bytes for turning into Ints 
00031     //If not, discard the leftover bytes.
00032 
00033     int numInts = theBytes.length / 4;
00034     numInts *=4;
00035     for(int ii=0; ii< numInts; ii+=4){
00036         int anInt = 0;
00037         for(int jj=0; jj!=4; ++jj){
00038 
00039         int piece = (int)theBytes[ii+jj];
00040         
00041         //System.out.println(piece);
00042 
00043         //casting thinks it should be a signed int
00044         if(piece<0&&jj!=3) {
00045             piece+=256;
00046         }
00047 
00048         piece<<=8*jj;
00049 
00050         //System.out.println(piece);
00051 
00052         anInt+=piece;
00053         }
00054         column.add(anInt);
00055     }
00056 
00057     return(column);
00058     }

The documentation for this class was generated from the following file:

Generated Wed Jan 17 09:14:27 GMT 2007