Package com.ibm.fhir.path.function

Class ResolveFunction

java.lang.Object

com.ibm.fhir.path.function.FHIRPathAbstractFunction

com.ibm.fhir.path.function.ResolveFunction

All Implemented Interfaces:

FHIRPathFunction

public class ResolveFunction
extends FHIRPathAbstractFunction

Constructor Summary

Constructors

Constructor	Description
ResolveFunction()

Method Summary

Modifier and Type	Method	Description
Collection<FHIRPathNode>	apply(FHIRPathEvaluator.EvaluationContext evaluationContext, Collection<FHIRPathNode> context, List<Collection<FHIRPathNode>> arguments)	For each item in the collection, if it is a string that is a uri (or canonical or url), locate the target of the reference, and add it to the resulting collection.
int	getMaxArity()
int	getMinArity()
String	getName()

Methods inherited from class com.ibm.fhir.path.function.FHIRPathAbstractFunction

equals, generateIssue, hashCode

Methods inherited from class java.lang.Object

clone, getClass, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ResolveFunction

public ResolveFunction()

Method Detail

getName

public String getName()

Specified by:

getName in interface FHIRPathFunction

Specified by:

getName in class FHIRPathAbstractFunction

getMinArity

public int getMinArity()

Specified by:

getMinArity in interface FHIRPathFunction

Specified by:

getMinArity in class FHIRPathAbstractFunction

getMaxArity

public int getMaxArity()

Specified by:

getMaxArity in interface FHIRPathFunction

Specified by:

getMaxArity in class FHIRPathAbstractFunction

apply

public Collection<FHIRPathNode> apply(FHIRPathEvaluator.EvaluationContext evaluationContext,
                                      Collection<FHIRPathNode> context,
                                      List<Collection<FHIRPathNode>> arguments)

For each item in the collection, if it is a string that is a uri (or canonical or url), locate the target of the reference, and add it to the resulting collection. If the item does not resolve to a resource, the item is ignored and nothing is added to the output collection. The items in the collection may also represent a Reference, in which case the Reference.reference is resolved.

This method creates a resource node that is a placeholder for the actual resource, thus allowing for the FHIRPath evaluator to perform type checking on the result of the resolve function. For example:

Observation.subject.where(resolve() is Patient)

If the resource type cannot be inferred from the reference URL or type, then FHIR_UNKNOWN_RESOURCE_TYPE is used so that we index these references by default.

Specified by:

apply in interface FHIRPathFunction

Overrides:

apply in class FHIRPathAbstractFunction

Parameters:

evaluationContext - the evaluation environment

context - the current evaluation context

arguments - the arguments for this function

Returns:

the result of the function applied to the context and arguments