Examples with Collector eu.esdihumboldt.cst.functions.groovy.helpers.util.Collector used on opensource projects

Example 1 with Collector

use of eu.esdihumboldt.cst.functions.groovy.helpers.util.Collector in project hale by halestudio.

the class AssignFromCollector method evaluate.

/**
 * @see eu.esdihumboldt.hale.common.align.transformation.function.impl.AbstractSingleTargetPropertyTransformation#evaluate(java.lang.String,
 *      eu.esdihumboldt.hale.common.align.transformation.engine.TransformationEngine,
 *      com.google.common.collect.ListMultimap, java.lang.String,
 *      eu.esdihumboldt.hale.common.align.model.impl.PropertyEntityDefinition,
 *      java.util.Map,
 *      eu.esdihumboldt.hale.common.align.transformation.report.TransformationLog)
 */
@Override
protected Object evaluate(String transformationIdentifier, TransformationEngine engine, ListMultimap<String, PropertyValue> variables, String resultName, PropertyEntityDefinition resultProperty, Map<String, String> executionParameters, TransformationLog log) throws TransformationException, NoResultException {
    // XXX check anchor?
    final Collector mainCollector = (Collector) getExecutionContext().getTransformationContext().get(ContextHelpers.KEY_COLLECTOR);
    if (mainCollector == null) {
        throw new TransformationException("Fatal: No collector has been created yet. Check function priority.");
    }
    final ParameterValue collectorName = getParameterChecked(PARAMETER_COLLECTOR);
    if (collectorName == null || collectorName.isEmpty()) {
        throw new TransformationException("Fatal: No collector name was specified.");
    }
    final Collector collector = mainCollector.getAt(collectorName.getValue().toString());
    if (collector == null) {
        throw new TransformationException(MessageFormat.format("Error retrieving collector \"{0}\"", collectorName.getValue().toString()));
    } else if (collector.values().isEmpty()) {
        log.warn(new TransformationMessageImpl(getCell(), MessageFormat.format("Collector \"{0}\" contains no values. If this is unexpected, check the spelling of the collector name and the priority of the transformation function.", collectorName.getStringRepresentation()), null));
    }
    // Determine where to assign the collected values
    final TypeDefinition resultPropertyType = resultProperty.getDefinition().getPropertyType();
    final PropertyDefinition targetProperty;
    final ResultStrategy resultStrategy;
    if (resultPropertyType.getConstraint(HasValueFlag.class).isEnabled()) {
        // The result property can take values, therefore assign directly to
        // property
        targetProperty = resultProperty.getDefinition();
        // No instance creation is required in this case
        resultStrategy = ResultStrategy.USE_VALUE;
    } else {
        // Find child element/attribute that can be assigned the reference
        targetProperty = Optional.ofNullable(findReferenceChildProperty(resultPropertyType)).orElseThrow(() -> new TransformationException("Fatal: No child property could be found to assign a reference to."));
        resultStrategy = ResultStrategy.BUILD_INSTANCE;
    }
    List<Object> collectedReferences = helper.extractCollectedValues(collector);
    // Process collected values if target property is a reference, otherwise
    // use plain values
    final Function<Object, Object> referenceStrategy;
    if (targetProperty.getConstraint(Reference.class).isReference()) {
        final Reference referenceConstraint = targetProperty.getConstraint(Reference.class);
        // Use the idToReference method to construct the reference
        referenceStrategy = referenceConstraint::idToReference;
    } else {
        referenceStrategy = Function.identity();
    }
    MultiValue result = new MultiValue();
    collectedReferences.forEach(ref -> result.add(resultStrategy.createResult(resultPropertyType, targetProperty, referenceStrategy.apply(ref))));
    return result;
}