/**
   * Iterate over a "operations" resource and extract the resource address
   *
   * <pre>
   * {
   * "operation-date" => "2016-07-11T16:00:30.930Z",
   * "domain-uuid" => "7be474f5-5be9-4040-9f19-8959cf603be0",
   * "access-mechanism" => "HTTP",
   * "remote-address" => "127.0.0.1/127.0.0.1",
   * "outcome" => "success",
   * "operations" => [{
   * "operation" => "composite",
   * "address" => [],
   * "steps" => [{
   * "address" => [
   * ("profile" => "default"),
   * ("subsystem" => "mail"),
   * ("mail-session" => "default"),
   * ("server" => "smtp")
   * ],
   * "operation" => "write-attribute",
   * "name" => "ssl",
   * "value" => true
   * }],
   * "operation-headers" => {
   * "access-mechanism" => "HTTP",
   * "caller-type" => "user"
   * }
   * }]
   * },
   *
   * </pre>
   *
   * and concatenate to the following form
   *
   * <pre>profile = default / subsystem = mail / mail-session = default / server = smtp</pre>
   *
   * @param changeItem The ModelNode
   * @return The formatted resource address as in
   *     <pre>profile = default / subsystem = mail / mail-session = default / server = smtp</pre>
   */
  private String extractResourceAddress(ModelNode changeItem) {
    StringBuilder address = new StringBuilder();
    ModelNode operations = changeItem.get(OPERATIONS);
    for (ModelNode op1 : operations.asList()) {
      String opName = op1.get(OP).asString();
      if (COMPOSITE.equals(opName)) {

        List<ModelNode> steps = op1.get(STEPS).asList();
        for (int idxStep = 0; idxStep < steps.size(); idxStep++) {
          ModelNode step = steps.get(idxStep);
          if (step.hasDefined(OP_ADDR)) {
            ModelNode addressNode = step.get(OP_ADDR);
            List<ModelNode> modelNodes = addressNode.asList();
            for (int i = 0; i < modelNodes.size(); i++) {
              ModelNode addr = modelNodes.get(i);
              Property p = addr.asProperty();
              address.append(p.getName()).append(" = ").append(p.getValue().asString());
              if (i + 1 < modelNodes.size()) address.append(" / ");
            }
          }
          // separates each step resource address
          if (idxStep + 1 < steps.size()) address.append(" | ");
        }

      } else {
        if (op1.hasDefined(OP_ADDR)) {
          ModelNode addressNode = op1.get(OP_ADDR);
          List<ModelNode> modelNodes = addressNode.asList();
          for (int i = 0; i < modelNodes.size(); i++) {
            ModelNode addr = modelNodes.get(i);
            Property p = addr.asProperty();
            address.append(p.getName()).append(" = ").append(p.getValue().asString());
            if (i + 1 < modelNodes.size()) address.append(" / ");
          }
        }
      }
    }
    return address.toString();
  }
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  public static Object downCast(ModelNode value, ModelNode metadata) {
    Object result = null;
    ModelType targetType = resolveTypeFromMetaData(metadata);
    switch (targetType) {
      case STRING:
        result = value.asString();
        break;
      case INT:
        result = value.asInt();
        break;
      case LONG:
        result = value.asLong();
        break;
      case BOOLEAN:
        result = value.asBoolean();
        break;
      case BIG_DECIMAL:
        result = value.asBigDecimal();
        break;
      case BIG_INTEGER:
        result = value.asBigInteger();
        break;
      case DOUBLE:
        result = value.asDouble();
        break;
      case LIST:
        {
          try {

            List<ModelNode> items = value.asList();
            List<String> list = new ArrayList<String>(items.size());
            for (ModelNode item : items) list.add(item.asString());
            result = list;

          } catch (Throwable t) {
            t.printStackTrace();
            result = new ArrayList<>(); // syntax errors
          }
          break;
        }
      case PROPERTY:
        { // it's actually interpreted as a property list, but that ttype doesn'ty really exist
          // (yet)
          try {

            List<Property> properties = value.asPropertyList();
            Map<String, String> map = new HashMap<>();
            for (Property item : properties) map.put(item.getName(), item.getValue().asString());
            result = map;

          } catch (Throwable t) {
            t.printStackTrace();
            result = new HashMap(); // syntax errors
          }
          break;
        }
      case UNDEFINED:
        break;
      default:
        throw new RuntimeException("Unexpected targetType " + targetType);
    }
    return result;
  }