Examples of org.openhab.core.transform.TransformationService

org.openhab.core.transform.TransformationService
A TransformationProcessor transforms a given input and returns the transformed result. Transformations could make sense in various situations, for example:
- extract certain informations from a weather forecast website
- extract the status of your TV which provides it's status on a webpage
- postprocess the output from a serial device to be human readable
One could provide his own processors by providing a new implementation of this Interface. @author Thomas.Eichstaedt-Engelenœauthor Kai Kreuzer @since 0.7.0

   *     the transformed value or the original one, if there was no service registered for the
   *     given type or a transformation exception occurred.
   */
  public static String transform(String type, String function, String value) {
    String result;
    TransformationService service = TransformationHelper.getTransformationService(TransformationActivator.getContext(), type);
    if(service!=null) {
      try {
        result = service.transform(function, value);
      } catch (TransformationException e) {
        logger.error("Error executing the transformation '" + type + "': " + e.getMessage());
        result = value;
      }      
    } else {

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    try {
      String[] parts = splitTransformationConfig(transformation);
      String transformationType = parts[0];
      String transformationFunction = parts[1];


      TransformationService transformationService = 
          TransformationHelper.getTransformationService(TCPActivator.getContext(), transformationType);
      if (transformationService != null) {
        transformedResponse = transformationService.transform(transformationFunction, response);
      } else {
        transformedResponse = response;
        logger.warn("couldn't transform response because transformationService of type '{}' is unavailable", transformationType);
      }
    }

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    if (transformationType != null && transformationFunction != null) {
      String transformedResponse = null;


      try {
        TransformationService transformationService = TransformationHelper
            .getTransformationService(
                OpenEnergyMonitorActivator.getContext(),
                transformationType);
        if (transformationService != null) {
          transformedResponse = transformationService.transform(
              transformationFunction, String.valueOf(data));
        } else {
          logger.warn(
              "couldn't transform response because transformationService of type '{}' is unavailable",
              transformationType);

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    try {
      String[] parts = splitTransformationConfig(transformation);
      String transformationType = parts[0];
      String transformationFunction = parts[1];


      TransformationService transformationService = 
          TransformationHelper.getTransformationService(TCPActivator.getContext(), transformationType);
      if (transformationService != null) {
        transformedResponse = transformationService.transform(transformationFunction, response);
      } else {
        transformedResponse = response;
        logger.warn("couldn't transform response because transformationService of type '{}' is unavailable", transformationType);
      }
    }

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      Matcher matcher = EXTRACT_TRANSFORMFUNCTION_PATTERN.matcher(label);
      if(matcher.find()) {
        String type = matcher.group(1);
        String pattern = matcher.group(2);
        String value = matcher.group(3);
        TransformationService transformation = 
          TransformationHelper.getTransformationService(UIActivator.getContext(), type);
        if(transformation!=null) {
          try {
            label = label.substring(0, label.indexOf("[")+1) + transformation.transform(pattern, value) + "]";
          } catch (TransformationException e) {
            logger.error("transformation throws exception [transformation="
                + transformation + ", value=" + value + "]", e);
            label = label.substring(0, label.indexOf("[")+1) + value + "]";
          }

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            try {
              String[] parts = splitTransformationConfig(transformation);
              String transformationType = parts[0];
              String transformationFunction = parts[1];
              
              TransformationService transformationService = 
                TransformationHelper.getTransformationService(ExecActivator.getContext(), transformationType);
              if (transformationService != null) {
                transformedResponse = transformationService.transform(transformationFunction, response);
              } else {
                transformedResponse = response;
                logger.warn("couldn't transform response because transformationService of type '{}' is unavailable", transformationType);
              }
            }

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            try {
              String[] parts = splitTransformationConfig(transformation);
              String transformationType = parts[0];
              String transformationFunction = parts[1];
              
              TransformationService transformationService = 
                TransformationHelper.getTransformationService(HttpActivator.getContext(), transformationType);
              if (transformationService != null) {
                transformedResponse = transformationService.transform(transformationFunction, response);
              } else {
                transformedResponse = response;
                logger.warn("couldn't transform response because transformationService of type '{}' is unavailable", transformationType);
              }
            }

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Related Classes of org.openhab.core.transform.TransformationService

org.openhab.binding.exec.internal.ExecBinding

org.openhab.binding.http.internal.HttpBinding

org.openhab.binding.openenergymonitor.internal.OpenEnergyMonitorBinding

org.openhab.binding.tcp.protocol.internal.TCPBinding

org.openhab.binding.tcp.protocol.internal.UDPBinding

org.openhab.core.transform.actions.Transformation

org.openhab.ui.internal.items.ItemUIRegistryImpl

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