Examples with TransformationException org.eclipse.smarthome.core.transform.TransformationException used on opensource projects

Example 1 with TransformationException

use of org.eclipse.smarthome.core.transform.TransformationException in project smarthome by eclipse.

the class JavaScriptTransformationService method transform.

/**
 * Transforms the input <code>source</code> by Java Script. It expects the
 * transformation rule to be read from a file which is stored under the
 * 'configurations/transform' folder. To organize the various
 * transformations one should use subfolders.
 *
 * @param filename
 *            the name of the file which contains the Java script
 *            transformation rule. Transformation service inject input
 *            (source) to 'input' variable.
 * @param source
 *            the input to transform
 */
@Override
public String transform(String filename, String source) throws TransformationException {
    Logger logger = LoggerFactory.getLogger(JavaScriptTransformationService.class);
    if (filename == null || source == null) {
        throw new TransformationException("the given parameters 'filename' and 'source' must not be null");
    }
    logger.debug("about to transform '{}' by the Java Script '{}'", source, filename);
    Reader reader;
    try {
        String path = ConfigConstants.getConfigFolder() + File.separator + TransformationService.TRANSFORM_FOLDER_NAME + File.separator + filename;
        reader = new InputStreamReader(new FileInputStream(path));
    } catch (FileNotFoundException e) {
        throw new TransformationException("An error occurred while loading script.", e);
    }
    ScriptEngineManager manager = new ScriptEngineManager();
    ScriptEngine engine = manager.getEngineByName("javascript");
    engine.put("input", source);
    Object result = null;
    long startTime = System.currentTimeMillis();
    try {
        result = engine.eval(reader);
    } catch (ScriptException e) {
        throw new TransformationException("An error occurred while executing script.", e);
    } finally {
        IOUtils.closeQuietly(reader);
    }
    logger.trace("JavaScript execution elapsed {} ms", System.currentTimeMillis() - startTime);
    return String.valueOf(result);
}

Example 2 with TransformationException

use of org.eclipse.smarthome.core.transform.TransformationException in project smarthome by eclipse.

the class JSonPathTransformationService method transform.

/**
 * Transforms the input <code>source</code> by JSonPath expression.
 *
 * @param function JsonPath expression
 * @param source String which contains JSON
 * @throws TransformationException If the JsonPath expression is invalid, a {@link InvalidPathException} is thrown,
 *             which is encapsulated in a {@link TransformationException}.
 */
@Override
public String transform(String jsonPathExpression, String source) throws TransformationException {
    if (jsonPathExpression == null || source == null) {
        throw new TransformationException("the given parameters 'JSonPath' and 'source' must not be null");
    }
    logger.debug("about to transform '{}' by the function '{}'", source, jsonPathExpression);
    try {
        Object transformationResult = JsonPath.read(source, jsonPathExpression);
        logger.debug("transformation resulted in '{}'", transformationResult);
        if (transformationResult == null) {
            return UnDefType.NULL.toFullString();
        } else if (transformationResult instanceof List) {
            return flattenList((List<?>) transformationResult);
        } else {
            return transformationResult.toString();
        }
    } catch (PathNotFoundException e) {
        throw new TransformationException("Invalid path '" + jsonPathExpression + "' in '" + source + "'");
    } catch (InvalidPathException | InvalidJsonException e) {
        throw new TransformationException("An error occurred while transforming JSON expression.", e);
    }
}

Example 3 with TransformationException

use of org.eclipse.smarthome.core.transform.TransformationException in project smarthome by eclipse.

the class ScaleTransformationService method internalLoadTransform.

@Override
protected Map<Range, String> internalLoadTransform(String filename) throws TransformationException {
    try (FileReader reader = new FileReader(filename)) {
        final Map<Range, String> data = new LinkedHashMap<>();
        final OrderedProperties properties = new OrderedProperties();
        properties.load(reader);
        for (Object orderedKey : properties.orderedKeys()) {
            final String entry = (String) orderedKey;
            final String value = properties.getProperty(entry);
            final Matcher matcher = LIMITS_PATTERN.matcher(entry);
            if (matcher.matches() && (matcher.groupCount() == 4)) {
                final boolean lowerInclusive = matcher.group(1).equals("]") ? false : true;
                final boolean upperInclusive = matcher.group(4).equals("[") ? false : true;
                final String lowLimit = matcher.group(2);
                final String highLimit = matcher.group(3);
                try {
                    final BigDecimal lowValue = lowLimit.isEmpty() ? null : new BigDecimal(lowLimit);
                    final BigDecimal highValue = highLimit.isEmpty() ? null : new BigDecimal(highLimit);
                    final Range range = Range.range(lowValue, lowerInclusive, highValue, upperInclusive);
                    data.put(range, value);
                } catch (NumberFormatException ex) {
                    throw new TransformationException("Error parsing bounds: " + lowLimit + ".." + highLimit);
                }
            } else {
                logger.warn("Scale transform file '{}' does not comply with syntax for entry : '{}', '{}'", filename, entry, value);
            }
        }
        return data;
    } catch (final IOException ex) {
        throw new TransformationException("An error occurred while opening file.", ex);
    }
}

Example 4 with TransformationException

use of org.eclipse.smarthome.core.transform.TransformationException in project smarthome by eclipse.

the class XPathTransformationService method transform.

@Override
public String transform(String xpathExpression, String source) throws TransformationException {
    if (xpathExpression == null || source == null) {
        throw new TransformationException("the given parameters 'xpath' and 'source' must not be null");
    }
    logger.debug("about to transform '{}' by the function '{}'", source, xpathExpression);
    StringReader stringReader = null;
    try {
        DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance();
        domFactory.setNamespaceAware(true);
        domFactory.setValidating(false);
        DocumentBuilder builder = domFactory.newDocumentBuilder();
        stringReader = new StringReader(source);
        InputSource inputSource = new InputSource(stringReader);
        inputSource.setEncoding("UTF-8");
        Document doc = builder.parse(inputSource);
        XPath xpath = XPathFactory.newInstance().newXPath();
        XPathExpression expr = xpath.compile(xpathExpression);
        String transformationResult = (String) expr.evaluate(doc, XPathConstants.STRING);
        logger.debug("transformation resulted in '{}'", transformationResult);
        return transformationResult;
    } catch (Exception e) {
        throw new TransformationException("transformation throws exceptions", e);
    } finally {
        if (stringReader != null) {
            stringReader.close();
        }
    }
}

Example 5 with TransformationException

use of org.eclipse.smarthome.core.transform.TransformationException in project smarthome by eclipse.

the class ItemUIRegistryImpl method transform.

/*
     * check if there is a status value being displayed on the right side of the
     * label (the right side is signified by being enclosed in square brackets [].
     * If so, check if the value starts with the call to a transformation service
     * (e.g. "[MAP(en.map):%s]") and execute the transformation in this case.
     * If the value does not start with the call to a transformation service,
     * we return the label with the mapped option value if provided (not null).
     */
private String transform(String label, String labelMappedOption) {
    String ret = label;
    if (getFormatPattern(label) != null) {
        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 {
                    ret = label.substring(0, label.indexOf("[") + 1) + transformation.transform(pattern, value) + "]";
                } catch (TransformationException e) {
                    logger.error("transformation throws exception [transformation={}, value={}]", transformation, value, e);
                    ret = label.substring(0, label.indexOf("[") + 1) + value + "]";
                }
            } else {
                logger.warn("couldn't transform value in label because transformationService of type '{}' is unavailable", type);
                ret = label.substring(0, label.indexOf("[") + 1) + value + "]";
            }
        } else if (labelMappedOption != null) {
            ret = labelMappedOption;
        }
    }
    return ret;
}