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Preserve file names of input Zip file – using Java Mapping.

Requirement: –

Input Zip file has Order123.txt and Order123.JPG files in it i.e. combination of text(csv, xml) and binary(image, pdf) files. Input Zip file should be unzipped and file names should be preserved i.e., output folder should have Order123.txt (with or without transformation) and Order123.JPN.

Solution: –


Design: –

Create dummy Data Type, Message Type and Outbound/Inbound Service Interfaces.



Parametrized Java Mapping: –

public class UnZipParticularFile extends AbstractTransformation { 
    public void transform(TransformationInput transformationInput, TransformationOutput transformationOutput) throws StreamTransformationException { 
        try { 
   inputstream = transformationInput.getInputPayload().getInputStream(); 
   outputstream = transformationOutput.getOutputPayload().getOutputStream(); 
            String fileNameP = transformationInput.getInputParameters().getString("FileNameP"); // Get Parameter. 
            // A. Unzip and write required file to output. 
   zis = new; 
            while ((ze = zis.getNextEntry()) != null) {
                //You can use String class methods like endsWith, toLowerCase, contains, matches. Update entry in Interface Determination of ICO accordingly.
                if (ze.getName().matches(fileNameP)) { //ze.getName() is File Name. 
                    int len; 
                    byte b[] = new byte[2048]; 
                    while ((len =, 0, 2048)) != -1) { 
                        outputstream.write(b, 0, len); 
            // B. Set target File Name and Folder. 
            java.util.Map mapParameters = transformationInput.getInputHeader().getAll(); 
            mapParameters.put(DynamicConfigurationKey.create("", StreamTransformationConstants.DYNAMIC_CONFIGURATION), ""); 
            DynamicConfiguration conf = (DynamicConfiguration) mapParameters.get(StreamTransformationConstants.DYNAMIC_CONFIGURATION); 
            conf.put(DynamicConfigurationKey.create("", "FileName"), ze.getName()); //ze.getName() is File Name. You can add Date prefix or some-other string according to requirement. 
            conf.put(DynamicConfigurationKey.create("", "Directory"), "/usr/sap/interfaces/MWS/out");  //You can have different fixed folder or dynamic folder according to requirement.
        } catch (Exception exception) { 
            throw new StreamTransformationException(exception.toString()); 

Configuration: –

Remove SWCV as input is binary file (Zip file).



If transformation is required for text file, create new Operational Mapping and add Message Map after Java Map.


Result: –

Input Zip file is unzipped and output file names are same as input file names.

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  • Hi Raghu

    Just a suggestion for enhancement.

    I think the matches() method is case sensitive. You might want to consider translating both the actual filename and the parameter value to the same upper/lower case (using temp variables) to compare.


    Eng Swee

    • Eng,

      Thank you for suggestion. I have added comment in code about using other methods of String class.

      @ Readers,

      boolean matches(String regex), method of String class takes regular expression as an input. This is the reason for .*txt (not *.txt), period matches a characters.

  • Hi Raghu,

    conf.put(DynamicConfigurationKey.create(“”, “Directory”), “/usr/sap/interfaces/MWS/out”); //You can have different fixed folder or dynamic folder according to requirement.

    You said that we can have diferent fixed folder for this scenario.

    Can you please say the command for that one.

    Thanks & Regards,