Package org.linuxforhealth.fhir.path.function

Class ResolveFunction

java.lang.Object

org.linuxforhealth.fhir.path.function.FHIRPathAbstractFunction

org.linuxforhealth.fhir.path.function.ResolveFunction

All Implemented Interfaces:

FHIRPathFunction

Direct Known Subclasses:

ServerResolveFunction

public class ResolveFunction
extends FHIRPathAbstractFunction

Constructor Summary

Constructors

Constructor	Description
ResolveFunction()

Method Summary

Modifier and Type	Method	Description
java.util.Collection<FHIRPathNode>	apply(FHIRPathEvaluator.EvaluationContext evaluationContext, java.util.Collection<FHIRPathNode> context, java.util.List<java.util.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()
java.lang.String	getName()
protected boolean	matchesServiceBaseUrl(java.lang.String baseUrl)
protected Resource	resolveRelativeReference(FHIRPathEvaluator.EvaluationContext evaluationContext, FHIRPathNode node, java.lang.String type, java.lang.String logicalId, java.lang.String versionId)

Methods inherited from class org.linuxforhealth.fhir.path.function.FHIRPathAbstractFunction

cacheFunctionResult, equals, generateIssue, getCachedFunctionResult, hasCachedFunctionResult, 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 java.lang.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 java.util.Collection<FHIRPathNode> apply(FHIRPathEvaluator.EvaluationContext evaluationContext,
                                                java.util.Collection<FHIRPathNode> context,
                                                java.util.List<java.util.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

resolveRelativeReference

protected Resource resolveRelativeReference(FHIRPathEvaluator.EvaluationContext evaluationContext,
                                            FHIRPathNode node,
                                            java.lang.String type,
                                            java.lang.String logicalId,
                                            java.lang.String versionId)

matchesServiceBaseUrl

protected boolean matchesServiceBaseUrl(java.lang.String baseUrl)