public Object clone() {
    MappingInputMeta retval = (MappingInputMeta) super.clone();

    int nrfields = fieldName.length;

    retval.allocate(nrfields);

    for (int i = 0; i < nrfields; i++) {
      retval.fieldName[i] = fieldName[i];
      retval.fieldType[i] = fieldType[i];
      fieldLength[i] = fieldLength[i];
      fieldPrecision[i] = fieldPrecision[i];
    }

    return retval;
  }
Example #2
0
  public void getFields(
      RowMetaInterface row,
      String origin,
      RowMetaInterface info[],
      StepMeta nextStep,
      VariableSpace space)
      throws KettleStepException {
    // First load some interesting data...

    // Then see which fields get added to the row.
    //
    TransMeta mappingTransMeta = null;
    try {
      mappingTransMeta = loadMappingMeta(this, repository, space);
    } catch (KettleException e) {
      throw new KettleStepException(
          BaseMessages.getString(PKG, "MappingMeta.Exception.UnableToLoadMappingTransformation"),
          e);
    }

    // The field structure may depend on the input parameters as well (think of parameter
    // replacements in MDX queries for instance)
    if (mappingParameters != null) {

      // See if we need to pass all variables from the parent or not...
      //
      if (mappingParameters.isInheritingAllVariables()) {
        mappingTransMeta.copyVariablesFrom(space);
      }

      // Just set the variables in the transformation statically.
      // This just means: set a number of variables or parameter values:
      //
      List<String> subParams = Arrays.asList(mappingTransMeta.listParameters());

      for (int i = 0; i < mappingParameters.getVariable().length; i++) {
        String name = mappingParameters.getVariable()[i];
        String value = space.environmentSubstitute(mappingParameters.getInputField()[i]);
        if (!Const.isEmpty(name) && !Const.isEmpty(value)) {
          if (subParams.contains(name)) {
            try {
              mappingTransMeta.setParameterValue(name, value);
            } catch (UnknownParamException e) {
              // this is explicitly checked for up front
            }
          }
          mappingTransMeta.setVariable(name, value);
        }
      }
    }

    // Keep track of all the fields that need renaming...
    //
    List<MappingValueRename> inputRenameList = new ArrayList<MappingValueRename>();

    /*
     * Before we ask the mapping outputs anything, we should teach the mapping
     * input steps in the sub-transformation about the data coming in...
     */
    for (MappingIODefinition definition : inputMappings) {

      RowMetaInterface inputRowMeta;

      if (definition.isMainDataPath() || Const.isEmpty(definition.getInputStepname())) {
        // The row metadata, what we pass to the mapping input step
        // definition.getOutputStep(), is "row"
        // However, we do need to re-map some fields...
        //
        inputRowMeta = row.clone();
        if (!inputRowMeta.isEmpty()) {
          for (MappingValueRename valueRename : definition.getValueRenames()) {
            ValueMetaInterface valueMeta =
                inputRowMeta.searchValueMeta(valueRename.getSourceValueName());
            if (valueMeta == null) {
              throw new KettleStepException(
                  BaseMessages.getString(
                      PKG,
                      "MappingMeta.Exception.UnableToFindField",
                      valueRename.getSourceValueName()));
            }
            valueMeta.setName(valueRename.getTargetValueName());
          }
        }
      } else {
        // The row metadata that goes to the info mapping input comes from the
        // specified step
        // In fact, it's one of the info steps that is going to contain this
        // information...
        //
        String[] infoSteps = getInfoSteps();
        int infoStepIndex = Const.indexOfString(definition.getInputStepname(), infoSteps);
        if (infoStepIndex < 0) {
          throw new KettleStepException(
              BaseMessages.getString(
                  PKG,
                  "MappingMeta.Exception.UnableToFindMetadataInfo",
                  definition.getInputStepname()));
        }
        if (info[infoStepIndex] != null) {
          inputRowMeta = info[infoStepIndex].clone();
        } else {
          inputRowMeta = null;
        }
      }

      // What is this mapping input step?
      //
      StepMeta mappingInputStep =
          mappingTransMeta.findMappingInputStep(definition.getOutputStepname());

      // We're certain it's a MappingInput step...
      //
      MappingInputMeta mappingInputMeta =
          (MappingInputMeta) mappingInputStep.getStepMetaInterface();

      // Inform the mapping input step about what it's going to receive...
      //
      mappingInputMeta.setInputRowMeta(inputRowMeta);

      // What values are we changing names for?
      //
      mappingInputMeta.setValueRenames(definition.getValueRenames());

      // Keep a list of the input rename values that need to be changed back at
      // the output
      //
      if (definition.isRenamingOnOutput())
        Mapping.addInputRenames(inputRenameList, definition.getValueRenames());
    }

    // All the mapping steps now know what they will be receiving.
    // That also means that the sub-transformation / mapping has everything it
    // needs.
    // So that means that the MappingOutput steps know exactly what the output
    // is going to be.
    // That could basically be anything.
    // It also could have absolutely no resemblance to what came in on the
    // input.
    // The relative old approach is therefore no longer suited.
    //
    // OK, but what we *can* do is have the MappingOutput step rename the
    // appropriate fields.
    // The mapping step will tell this step how it's done.
    //
    // Let's look for the mapping output step that is relevant for this actual
    // call...
    //
    MappingIODefinition mappingOutputDefinition = null;
    if (nextStep == null) {
      // This is the main step we read from...
      // Look up the main step to write to.
      // This is the output mapping definition with "main path" enabled.
      //
      for (MappingIODefinition definition : outputMappings) {
        if (definition.isMainDataPath() || Const.isEmpty(definition.getOutputStepname())) {
          // This is the definition to use...
          //
          mappingOutputDefinition = definition;
        }
      }
    } else {
      // Is there an output mapping definition for this step?
      // If so, we can look up the Mapping output step to see what has changed.
      //

      for (MappingIODefinition definition : outputMappings) {
        if (nextStep.getName().equals(definition.getOutputStepname())
            || definition.isMainDataPath()
            || Const.isEmpty(definition.getOutputStepname())) {
          mappingOutputDefinition = definition;
        }
      }
    }

    if (mappingOutputDefinition == null) {
      throw new KettleStepException(
          BaseMessages.getString(PKG, "MappingMeta.Exception.UnableToFindMappingDefinition"));
    }

    // OK, now find the mapping output step in the mapping...
    // This method in TransMeta takes into account a number of things, such as
    // the step not specified, etc.
    // The method never returns null but throws an exception.
    //
    StepMeta mappingOutputStep =
        mappingTransMeta.findMappingOutputStep(mappingOutputDefinition.getInputStepname());

    // We know it's a mapping output step...
    MappingOutputMeta mappingOutputMeta =
        (MappingOutputMeta) mappingOutputStep.getStepMetaInterface();

    // Change a few columns.
    mappingOutputMeta.setOutputValueRenames(mappingOutputDefinition.getValueRenames());

    // Perhaps we need to change a few input columns back to the original?
    //
    mappingOutputMeta.setInputValueRenames(inputRenameList);

    // Now we know wat's going to come out of there...
    // This is going to be the full row, including all the remapping, etc.
    //
    RowMetaInterface mappingOutputRowMeta = mappingTransMeta.getStepFields(mappingOutputStep);

    row.clear();
    row.addRowMeta(mappingOutputRowMeta);
  }