Sample source code for a custom transform class

This sample does not demonstrate how to transform the data but rather how to access the needed elements and set the appropriate return to ODWEK. With this sample, the data as it is stored in Content Manager OnDemand and the data returned are identical. Your implementation will need complete the transformation itself.

//*******************************************************************
// Testcase:  CustomTransform
//
// This class tests the ODWEK Generic Transform's Custom
// Java Interface by implementing the required transformData method.
//
// transformData is called by ODWEK when its corresponding custom
// viewer is called via ODHit.retrieve.
//*******************************************************************
import java.util.*;
import com.ibm.edms.od.*;

public class  CustomTransform {
public static HashMap<String,byte[]> transformData(HashMap<String,?> odMap) throws Exception {

        // List this transform name from the XML file
        System.out.println("  Transform name: " + (String)odMap.get(ODTransform.TXFRM_REQ_NAME));

        // List the property keys and values ODWEK read from the transform XML
        // file and provided to this Custom Class
        System.out.println("  Transform properties:");
        Properties gtProps = (Properties)odMap.get(ODTransform.TXFRM_REQ_PROPS);
        Enumeration<?> enumeration = gtProps.keys();
        List<String> list = new ArrayList<String>();
        while (enumeration.hasMoreElements()) {
            list.add((String)enumeration.nextElement());
        }
        Collections.sort(list);
        for (String key : list)
            System.out.println(String.format("%25s = %-25s", key, gtProps.getProperty(key)));

        // Retrieve the native document from ODWEK
        byte[] inDoc = (byte [])odMap.get(ODTransform.TXFRM_REQ_DATA);
        System.out.println("  Retrieved document size: "
                              + (inDoc == null ? "0" : inDoc.length) + " bytes");

        // Retrieve the document resources from ODWEK
        byte[] inRes = (byte [])odMap.get(ODTransform.TXFRM_REQ_RES);
        System.out.println("  Retrieved resource size: " 
                            + (inRes == null ? "No resources available": inRes.length));

        // Normally this is where you do the transform or do something with the byte data.
        // Let's just concat the resources if there are any to the doc
        byte[] transformedDoc;
        if (inRes != null) {
            transformedDoc  = new byte[inRes.length + inDoc.length];
            System.arraycopy(inRes, 0, transformedDoc, 0, inRes.length);
            System.arraycopy(inDoc, 0, transformedDoc, inRes.length, inDoc.length);
        }
        else
            transformedDoc = inDoc;
        System.out.println("  Transformed document total size: " + transformedDoc.length);

        // Send the transformed data back to ODWEK
        HashMap<String,byte[]> rtnMap = new HashMap<String, byte[]>();
        rtnMap.put(ODTransform.TXFRM_RESP_DATA, (byte[])transformedDoc);
        return rtnMap;
    }
}

Output from the print statements in the example CustomTransform program might look like the following. Note that output values are definition dependent.

Transform name: MYTXFRM
Transform properties:
            ApplGrpName = FinancialReports                    
               ApplName = Ledgers               
                     CC = A                        
               CodePage = 850                      
                 recfmt = S                        
Retrieved document size: 7018 bytes
Retrieved resource size: No resources available
Transformed document total size: 7018