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Backport the defineVariable code to the R4 and R4B fhirpath implementations

This commit is contained in:
Brian Postlethwaite 2024-04-17 13:09:12 +10:00
parent 0664e5601d
commit d56404afd6
5 changed files with 334 additions and 14 deletions
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6
org.hl7.fhir.r4/src/main/java/org/hl7/fhir/r4/fhirpath/ExpressionNode.java
View File

@ -50,7 +50,7 @@ public class ExpressionNode {
Empty, Not, Exists, SubsetOf, SupersetOf, IsDistinct, Distinct, Count, Where, Select, All, Repeat, Aggregate,
Item /* implicit from name[] */, As, Is, Single, First, Last, Tail, Skip, Take, Union, Combine, Intersect, Exclude,
Iif, Upper, Lower, ToChars, IndexOf, Substring, StartsWith, EndsWith, Matches, MatchesFull, ReplaceMatches,
Contains, Replace, Length, Children, Descendants, MemberOf, Trace, Check, Today, Now, Resolve, Extension, AllFalse,
Contains, Replace, Length, Children, Descendants, MemberOf, Trace, DefineVariable, Check, Today, Now, Resolve, Extension, AllFalse,
AnyFalse, AllTrue, AnyTrue, HasValue, OfType, Type, ConvertsToBoolean, ConvertsToInteger, ConvertsToString,
ConvertsToDecimal, ConvertsToQuantity, ConvertsToDateTime, ConvertsToDate, ConvertsToTime, ToBoolean, ToInteger,
ToString, ToDecimal, ToQuantity, ToDateTime, ToTime, ConformsTo, Round, Sqrt, Abs, Ceiling, Exp, Floor, Ln, Log,
@ -151,6 +151,8 @@ public class ExpressionNode {
return Function.MemberOf;
if (name.equals("trace"))
return Function.Trace;
if (name.equals("defineVariable"))
return Function.DefineVariable;
if (name.equals("check"))
return Function.Check;
if (name.equals("today"))
@ -349,6 +351,8 @@ public class ExpressionNode {
return "memberOf";
case Trace:
return "trace";
case DefineVariable :
return "defineVariable";
case Check:
return "check";
case Today:

168
org.hl7.fhir.r4/src/main/java/org/hl7/fhir/r4/fhirpath/FHIRPathEngine.java
View File

@ -139,6 +139,7 @@ public class FHIRPathEngine {
/**
* A constant reference - e.g. a reference to a name that must be resolved in
* context. The % will be removed from the constant name before this is invoked.
* Variables created with defineVariable will not be processed by resolveConstant (or resolveConstantType)
*
* This will also be called if the host invokes the FluentPath engine with a
* context of null
@ -849,6 +850,7 @@ public class FHIRPathEngine {
private Base thisItem;
private List<Base> total;
private int index;
private Map<String, List<Base>> definedVariables;
public ExecutionContext(Object appInfo, Base resource, Base rootResource, Base context, Base thisItem) {
this.appInfo = appInfo;
@ -887,6 +889,30 @@ public class FHIRPathEngine {
index = i;
return this;
}
public boolean hasDefinedVariable(String name) {
return definedVariables != null && definedVariables.containsKey(name);
}
public List<Base> getDefinedVariable(String name) {
return definedVariables == null ? makeNull() : definedVariables.get(name);
}
public void setDefinedVariable(String name, List<Base> value) {
if (isSystemVariable(name))
throw new PathEngineException(worker.formatMessage(I18nConstants.FHIRPATH_REDEFINE_VARIABLE, name), I18nConstants.FHIRPATH_REDEFINE_VARIABLE);
if (definedVariables == null) {
definedVariables = new HashMap<String, List<Base>>();
} else {
if (definedVariables.containsKey(name)) {
// Can't do this, so throw an error
throw new PathEngineException(worker.formatMessage(I18nConstants.FHIRPATH_REDEFINE_VARIABLE, name), I18nConstants.FHIRPATH_REDEFINE_VARIABLE);
}
}
definedVariables.put(name, value);
}
}
private class ExecutionTypeContext {
@ -895,6 +921,7 @@ public class FHIRPathEngine {
private TypeDetails context;
private TypeDetails thisItem;
private TypeDetails total;
private Map<String, TypeDetails> definedVariables;
public ExecutionTypeContext(Object appInfo, String resource, TypeDetails context, TypeDetails thisItem) {
super();
@ -913,6 +940,29 @@ public class FHIRPathEngine {
return thisItem;
}
public boolean hasDefinedVariable(String name) {
return definedVariables != null && definedVariables.containsKey(name);
}
public TypeDetails getDefinedVariable(String name) {
return definedVariables == null ? null : definedVariables.get(name);
}
public void setDefinedVariable(String name, TypeDetails value) {
if (isSystemVariable(name))
throw new PathEngineException("Redefine of variable "+name, I18nConstants.FHIRPATH_REDEFINE_VARIABLE);
if (definedVariables == null) {
definedVariables = new HashMap<String, TypeDetails>();
} else {
if (definedVariables.containsKey(name)) {
// Can't do this, so throw an error
throw new PathEngineException("Redefine of variable "+name, I18nConstants.FHIRPATH_REDEFINE_VARIABLE);
}
}
definedVariables.put(name, value);
}
}
private ExpressionNode parseExpression(FHIRLexer lexer, boolean proximal) throws FHIRLexerException {
@ -1314,6 +1364,8 @@ public class FHIRPathEngine {
return checkParamCount(lexer, location, exp, 1);
case Trace:
return checkParamCount(lexer, location, exp, 1, 2);
case DefineVariable:
return checkParamCount(lexer, location, exp, 1, 2);
case Check:
return checkParamCount(lexer, location, exp, 2);
case Today:
@ -1419,9 +1471,10 @@ public class FHIRPathEngine {
return false;
}
private List<Base> execute(ExecutionContext context, List<Base> focus, ExpressionNode exp, boolean atEntry)
private List<Base> execute(ExecutionContext inContext, List<Base> focus, ExpressionNode exp, boolean atEntry)
throws FHIRException {
// System.out.println("Evaluate {'"+exp.toString()+"'} on "+focus.toString());
ExecutionContext context = contextForParameter(inContext);
List<Base> work = new ArrayList<Base>();
switch (exp.getKind()) {
case Unary:
@ -1465,6 +1518,7 @@ public class FHIRPathEngine {
ExpressionNode next = exp.getOpNext();
ExpressionNode last = exp;
while (next != null) {
context = contextForParameter(inContext);
List<Base> work2 = preOperate(work, last.getOperation(), exp);
if (work2 != null) {
work = work2;
@ -1528,9 +1582,10 @@ public class FHIRPathEngine {
return new TypeDetails(CollectionStatus.SINGLETON, exp.getName());
}
private TypeDetails executeType(ExecutionTypeContext context, TypeDetails focus, ExpressionNode exp, boolean atEntry)
private TypeDetails executeType(ExecutionTypeContext inContext, TypeDetails focus, ExpressionNode exp, boolean atEntry)
throws PathEngineException, DefinitionException {
TypeDetails result = new TypeDetails(null);
ExecutionTypeContext context = contextForParameter(inContext);
TypeDetails result = new TypeDetails(null);
switch (exp.getKind()) {
case Name:
if (atEntry && exp.getName().equals("$this")) {
@ -1574,6 +1629,7 @@ public class FHIRPathEngine {
ExpressionNode next = exp.getOpNext();
ExpressionNode last = exp;
while (next != null) {
context = contextForParameter(inContext);
TypeDetails work;
if (last.getOperation() == Operation.Is || last.getOperation() == Operation.As) {
work = executeTypeName(context, focus, next, atEntry);
@ -1598,6 +1654,10 @@ public class FHIRPathEngine {
}
FHIRConstant c = (FHIRConstant) constant;
if (c.getValue().startsWith("%")) {
String varName = c.getValue().substring(1);
if (context.hasDefinedVariable(varName)) {
return context.getDefinedVariable(varName);
}
return resolveConstant(context, c.getValue(), beforeContext, expr, explicitConstant);
} else if (c.getValue().startsWith("@")) {
return new ArrayList<Base>(Arrays.asList(processDateConstant(context.appInfo, c.getValue().substring(1), expr)));
@ -1668,6 +1728,22 @@ public class FHIRPathEngine {
}
}
static boolean isSystemVariable(String name){
if (name.equals("sct"))
return true;
if (name.equals("loinc"))
return true;
if (name.equals("ucum"))
return true;
if (name.equals("resource"))
return true;
if (name.equals("rootResource"))
return true;
if (name.equals("context"))
return true;
return false;
}
private List<Base> resolveConstant(ExecutionContext context, String s, boolean beforeContext, ExpressionNode expr, boolean explicitConstant)
throws PathEngineException {
if (s.equals("%sct")) {
@ -3111,8 +3187,14 @@ public class FHIRPathEngine {
} else if (s.startsWith("%`ext-")) {
return new TypeDetails(CollectionStatus.SINGLETON, TypeDetails.FP_String);
} else if (hostServices == null) {
String varName = s.substring(1);
if (context.hasDefinedVariable(varName))
return context.getDefinedVariable(varName);
throw makeException(expr, I18nConstants.FHIRPATH_UNKNOWN_CONSTANT, s);
} else {
String varName = s.substring(1);
if (context.hasDefinedVariable(varName))
return context.getDefinedVariable(varName);
return hostServices.resolveConstantType(this, context.appInfo, s, explicitConstant);
}
}
@ -3409,6 +3491,25 @@ public class FHIRPathEngine {
new TypeDetails(CollectionStatus.SINGLETON, TypeDetails.FP_String));
return focus;
}
case DefineVariable : {
checkParamTypes(exp, exp.getFunction().toCode(), paramTypes, new TypeDetails(CollectionStatus.UNORDERED, TypeDetails.FP_String));
// set the type of the variable
// Actually evaluate the value of the first parameter (to get the name of the variable if possible)
// and if have that, set it into the context
ExpressionNode p = exp.getParameters().get(0);
if (p.getKind() == Kind.Constant && p.getConstant() != null) {
String varName = exp.getParameters().get(0).getConstant().primitiveValue();
if (varName != null) {
if (paramTypes.size() > 1)
context.setDefinedVariable(varName, paramTypes.get(1));
else
context.setDefinedVariable(varName, focus);
}
} else {
// this variable is not a constant, so we can't analyze what name it could have
}
return focus;
}
case Check: {
checkParamTypes(exp, exp.getFunction().toCode(), paramTypes,
new TypeDetails(CollectionStatus.SINGLETON, TypeDetails.FP_String));
@ -3592,7 +3693,7 @@ public class FHIRPathEngine {
|| exp.getFunction() == Function.All || exp.getFunction() == Function.Select
|| exp.getFunction() == Function.Repeat || exp.getFunction() == Function.Aggregate;
case 1:
return exp.getFunction() == Function.Trace;
return exp.getFunction() == Function.Trace || exp.getFunction() == Function.DefineVariable;
default:
return false;
}
@ -3800,6 +3901,8 @@ public class FHIRPathEngine {
return funcMemberOf(context, focus, exp);
case Trace:
return funcTrace(context, focus, exp);
case DefineVariable:
return funcDefineVariable(context, focus, exp);
case Check:
return funcCheck(context, focus, exp);
case Today:
@ -4532,11 +4635,50 @@ public class FHIRPathEngine {
}
private ExecutionContext changeThis(ExecutionContext context, Base newThis) {
return new ExecutionContext(context.appInfo, context.focusResource, context.rootResource, context.context, newThis);
ExecutionContext newContext = new ExecutionContext(context.appInfo, context.focusResource, context.rootResource, context.context,
newThis);
// append all of the defined variables from the context into the new context
if (context.definedVariables != null) {
for (String s : context.definedVariables.keySet()) {
newContext.setDefinedVariable(s, context.definedVariables.get(s));
}
}
return newContext;
}
private ExecutionContext contextForParameter(ExecutionContext context) {
ExecutionContext newContext = new ExecutionContext(context.appInfo, context.focusResource, context.rootResource, context.context, context.thisItem);
newContext.total = context.total;
newContext.index = context.index;
// append all of the defined variables from the context into the new context
if (context.definedVariables != null) {
for (String s : context.definedVariables.keySet()) {
newContext.setDefinedVariable(s, context.definedVariables.get(s));
}
}
return newContext;
}
private ExecutionTypeContext changeThis(ExecutionTypeContext context, TypeDetails newThis) {
return new ExecutionTypeContext(context.appInfo, context.resource, context.context, newThis);
ExecutionTypeContext newContext = new ExecutionTypeContext(context.appInfo, context.resource, context.context, newThis);
// append all of the defined variables from the context into the new context
if (context.definedVariables != null) {
for (String s : context.definedVariables.keySet()) {
newContext.setDefinedVariable(s, context.definedVariables.get(s));
}
}
return newContext;
}
private ExecutionTypeContext contextForParameter(ExecutionTypeContext context) {
ExecutionTypeContext newContext = new ExecutionTypeContext(context.appInfo, context.resource, context.context, context.thisItem);
// append all of the defined variables from the context into the new context
if (context.definedVariables != null) {
for (String s : context.definedVariables.keySet()) {
newContext.setDefinedVariable(s, context.definedVariables.get(s));
}
}
return newContext;
}
private List<Base> funcNow(ExecutionContext context, List<Base> focus, ExpressionNode exp) {
@ -5363,6 +5505,20 @@ public class FHIRPathEngine {
return focus;
}
private List<Base> funcDefineVariable(ExecutionContext context, List<Base> focus, ExpressionNode exp) throws FHIRException {
List<Base> nl = execute(context, focus, exp.getParameters().get(0), true);
String name = nl.get(0).primitiveValue();
List<Base> value;
if (exp.getParameters().size() == 2) {
value = execute(context, focus, exp.getParameters().get(1), true);
} else {
value = focus;
}
// stash the variable into the context
context.setDefinedVariable(name, value);
return focus;
}
private List<Base> funcCheck(ExecutionContext context, List<Base> focus, ExpressionNode expr) throws FHIRException {
List<Base> n1 = execute(context, focus, expr.getParameters().get(0), true);
if (!convertToBoolean(n1)) {

6
org.hl7.fhir.r4b/src/main/java/org/hl7/fhir/r4b/fhirpath/ExpressionNode.java
View File

@ -50,7 +50,7 @@ public class ExpressionNode {
Empty, Not, Exists, SubsetOf, SupersetOf, IsDistinct, Distinct, Count, Where, Select, All, Repeat, Aggregate,
Item /* implicit from name[] */, As, Is, Single, First, Last, Tail, Skip, Take, Union, Combine, Intersect, Exclude,
Iif, Upper, Lower, ToChars, IndexOf, Substring, StartsWith, EndsWith, Matches, MatchesFull, ReplaceMatches,
Contains, Replace, Length, Children, Descendants, MemberOf, Trace, Check, Today, Now, Resolve, Extension, AllFalse,
Contains, Replace, Length, Children, Descendants, MemberOf, Trace, DefineVariable, Check, Today, Now, Resolve, Extension, AllFalse,
AnyFalse, AllTrue, AnyTrue, HasValue, OfType, Type, ConvertsToBoolean, ConvertsToInteger, ConvertsToString,
ConvertsToDecimal, ConvertsToQuantity, ConvertsToDateTime, ConvertsToDate, ConvertsToTime, ToBoolean, ToInteger,
ToString, ToDecimal, ToQuantity, ToDateTime, ToTime, ConformsTo, Round, Sqrt, Abs, Ceiling, Exp, Floor, Ln, Log,
@ -151,6 +151,8 @@ public class ExpressionNode {
return Function.MemberOf;
if (name.equals("trace"))
return Function.Trace;
if (name.equals("defineVariable"))
return Function.DefineVariable;
if (name.equals("check"))
return Function.Check;
if (name.equals("today"))
@ -349,6 +351,8 @@ public class ExpressionNode {
return "memberOf";
case Trace:
return "trace";
case DefineVariable :
return "defineVariable";
case Check:
return "check";
case Today:

162
org.hl7.fhir.r4b/src/main/java/org/hl7/fhir/r4b/fhirpath/FHIRPathEngine.java
View File

@ -140,6 +140,7 @@ public class FHIRPathEngine {
/**
* A constant reference - e.g. a reference to a name that must be resolved in
* context. The % will be removed from the constant name before this is invoked.
* Variables created with defineVariable will not be processed by resolveConstant (or resolveConstantType)
*
* This will also be called if the host invokes the FluentPath engine with a
* context of null
@ -850,6 +851,7 @@ public class FHIRPathEngine {
private Base thisItem;
private List<Base> total;
private int index;
private Map<String, List<Base>> definedVariables;
public ExecutionContext(Object appInfo, Base resource, Base rootResource, Base context, Base thisItem) {
this.appInfo = appInfo;
@ -888,6 +890,30 @@ public class FHIRPathEngine {
index = i;
return this;
}
public boolean hasDefinedVariable(String name) {
return definedVariables != null && definedVariables.containsKey(name);
}
public List<Base> getDefinedVariable(String name) {
return definedVariables == null ? makeNull() : definedVariables.get(name);
}
public void setDefinedVariable(String name, List<Base> value) {
if (isSystemVariable(name))
throw new PathEngineException(worker.formatMessage(I18nConstants.FHIRPATH_REDEFINE_VARIABLE, name), I18nConstants.FHIRPATH_REDEFINE_VARIABLE);
if (definedVariables == null) {
definedVariables = new HashMap<String, List<Base>>();
} else {
if (definedVariables.containsKey(name)) {
// Can't do this, so throw an error
throw new PathEngineException(worker.formatMessage(I18nConstants.FHIRPATH_REDEFINE_VARIABLE, name), I18nConstants.FHIRPATH_REDEFINE_VARIABLE);
}
}
definedVariables.put(name, value);
}
}
private class ExecutionTypeContext {
@ -896,6 +922,7 @@ public class FHIRPathEngine {
private TypeDetails context;
private TypeDetails thisItem;
private TypeDetails total;
private Map<String, TypeDetails> definedVariables;
public ExecutionTypeContext(Object appInfo, String resource, TypeDetails context, TypeDetails thisItem) {
super();
@ -914,6 +941,29 @@ public class FHIRPathEngine {
return thisItem;
}
public boolean hasDefinedVariable(String name) {
return definedVariables != null && definedVariables.containsKey(name);
}
public TypeDetails getDefinedVariable(String name) {
return definedVariables == null ? null : definedVariables.get(name);
}
public void setDefinedVariable(String name, TypeDetails value) {
if (isSystemVariable(name))
throw new PathEngineException("Redefine of variable "+name, I18nConstants.FHIRPATH_REDEFINE_VARIABLE);
if (definedVariables == null) {
definedVariables = new HashMap<String, TypeDetails>();
} else {
if (definedVariables.containsKey(name)) {
// Can't do this, so throw an error
throw new PathEngineException("Redefine of variable "+name, I18nConstants.FHIRPATH_REDEFINE_VARIABLE);
}
}
definedVariables.put(name, value);
}
}
private ExpressionNode parseExpression(FHIRLexer lexer, boolean proximal) throws FHIRLexerException {
@ -1314,6 +1364,8 @@ public class FHIRPathEngine {
return checkParamCount(lexer, location, exp, 1);
case Trace:
return checkParamCount(lexer, location, exp, 1, 2);
case DefineVariable:
return checkParamCount(lexer, location, exp, 1, 2);
case Check:
return checkParamCount(lexer, location, exp, 2);
case Today:
@ -1419,9 +1471,10 @@ public class FHIRPathEngine {
return false;
}
private List<Base> execute(ExecutionContext context, List<Base> focus, ExpressionNode exp, boolean atEntry)
private List<Base> execute(ExecutionContext inContext, List<Base> focus, ExpressionNode exp, boolean atEntry)
throws FHIRException {
// System.out.println("Evaluate {'"+exp.toString()+"'} on "+focus.toString());
ExecutionContext context = contextForParameter(inContext);
List<Base> work = new ArrayList<Base>();
switch (exp.getKind()) {
case Unary:
@ -1465,6 +1518,7 @@ public class FHIRPathEngine {
ExpressionNode next = exp.getOpNext();
ExpressionNode last = exp;
while (next != null) {
context = contextForParameter(inContext);
List<Base> work2 = preOperate(work, last.getOperation(), exp);
if (work2 != null) {
work = work2;
@ -1528,8 +1582,9 @@ public class FHIRPathEngine {
return new TypeDetails(CollectionStatus.SINGLETON, exp.getName());
}
private TypeDetails executeType(ExecutionTypeContext context, TypeDetails focus, ExpressionNode exp, boolean atEntry)
private TypeDetails executeType(ExecutionTypeContext inContext, TypeDetails focus, ExpressionNode exp, boolean atEntry)
throws PathEngineException, DefinitionException {
ExecutionTypeContext context = contextForParameter(inContext);
TypeDetails result = new TypeDetails(null);
switch (exp.getKind()) {
case Name:
@ -1574,6 +1629,7 @@ public class FHIRPathEngine {
ExpressionNode next = exp.getOpNext();
ExpressionNode last = exp;
while (next != null) {
context = contextForParameter(inContext);
TypeDetails work;
if (last.getOperation() == Operation.Is || last.getOperation() == Operation.As) {
work = executeTypeName(context, focus, next, atEntry);
@ -1599,6 +1655,10 @@ public class FHIRPathEngine {
}
FHIRConstant c = (FHIRConstant) constant;
if (c.getValue().startsWith("%")) {
String varName = c.getValue().substring(1);
if (context.hasDefinedVariable(varName)) {
return context.getDefinedVariable(varName);
}
return resolveConstant(context, c.getValue(), beforeContext, expr, explicitConstant);
} else if (c.getValue().startsWith("@")) {
return new ArrayList<Base>(Arrays.asList(processDateConstant(context.appInfo, c.getValue().substring(1), expr)));
@ -1669,6 +1729,22 @@ public class FHIRPathEngine {
}
}
static boolean isSystemVariable(String name){
if (name.equals("sct"))
return true;
if (name.equals("loinc"))
return true;
if (name.equals("ucum"))
return true;
if (name.equals("resource"))
return true;
if (name.equals("rootResource"))
return true;
if (name.equals("context"))
return true;
return false;
}
private List<Base> resolveConstant(ExecutionContext context, String s, boolean beforeContext, ExpressionNode expr, boolean explicitConstant)
throws PathEngineException {
if (s.equals("%sct")) {
@ -3113,8 +3189,14 @@ public class FHIRPathEngine {
} else if (s.startsWith("%`ext-")) {
return new TypeDetails(CollectionStatus.SINGLETON, TypeDetails.FP_String);
} else if (hostServices == null) {
String varName = s.substring(1);
if (context.hasDefinedVariable(varName))
return context.getDefinedVariable(varName);
throw makeException(expr, I18nConstants.FHIRPATH_UNKNOWN_CONSTANT, s);
} else {
String varName = s.substring(1);
if (context.hasDefinedVariable(varName))
return context.getDefinedVariable(varName);
return hostServices.resolveConstantType(this, context.appInfo, s, explicitConstant);
}
}
@ -3411,6 +3493,25 @@ public class FHIRPathEngine {
new TypeDetails(CollectionStatus.SINGLETON, TypeDetails.FP_String));
return focus;
}
case DefineVariable : {
checkParamTypes(exp, exp.getFunction().toCode(), paramTypes, new TypeDetails(CollectionStatus.UNORDERED, TypeDetails.FP_String));
// set the type of the variable
// Actually evaluate the value of the first parameter (to get the name of the variable if possible)
// and if have that, set it into the context
ExpressionNode p = exp.getParameters().get(0);
if (p.getKind() == Kind.Constant && p.getConstant() != null) {
String varName = exp.getParameters().get(0).getConstant().primitiveValue();
if (varName != null) {
if (paramTypes.size() > 1)
context.setDefinedVariable(varName, paramTypes.get(1));
else
context.setDefinedVariable(varName, focus);
}
} else {
// this variable is not a constant, so we can't analyze what name it could have
}
return focus;
}
case Check: {
checkParamTypes(exp, exp.getFunction().toCode(), paramTypes,
new TypeDetails(CollectionStatus.SINGLETON, TypeDetails.FP_String));
@ -3594,7 +3695,7 @@ public class FHIRPathEngine {
|| exp.getFunction() == Function.All || exp.getFunction() == Function.Select
|| exp.getFunction() == Function.Repeat || exp.getFunction() == Function.Aggregate;
case 1:
return exp.getFunction() == Function.Trace;
return exp.getFunction() == Function.Trace || exp.getFunction() == Function.DefineVariable;
default:
return false;
}
@ -3802,6 +3903,8 @@ public class FHIRPathEngine {
return funcMemberOf(context, focus, exp);
case Trace:
return funcTrace(context, focus, exp);
case DefineVariable:
return funcDefineVariable(context, focus, exp);
case Check:
return funcCheck(context, focus, exp);
case Today:
@ -4536,11 +4639,48 @@ public class FHIRPathEngine {
private ExecutionContext changeThis(ExecutionContext context, Base newThis) {
ExecutionContext newContext = new ExecutionContext(context.appInfo, context.focusResource, context.rootResource, context.context,
newThis);
// append all of the defined variables from the context into the new context
if (context.definedVariables != null) {
for (String s : context.definedVariables.keySet()) {
newContext.setDefinedVariable(s, context.definedVariables.get(s));
}
}
return newContext;
}
private ExecutionContext contextForParameter(ExecutionContext context) {
ExecutionContext newContext = new ExecutionContext(context.appInfo, context.focusResource, context.rootResource, context.context, context.thisItem);
newContext.total = context.total;
newContext.index = context.index;
// append all of the defined variables from the context into the new context
if (context.definedVariables != null) {
for (String s : context.definedVariables.keySet()) {
newContext.setDefinedVariable(s, context.definedVariables.get(s));
}
}
return newContext;
}
private ExecutionTypeContext changeThis(ExecutionTypeContext context, TypeDetails newThis) {
return new ExecutionTypeContext(context.appInfo, context.resource, context.context, newThis);
ExecutionTypeContext newContext = new ExecutionTypeContext(context.appInfo, context.resource, context.context, newThis);
// append all of the defined variables from the context into the new context
if (context.definedVariables != null) {
for (String s : context.definedVariables.keySet()) {
newContext.setDefinedVariable(s, context.definedVariables.get(s));
}
}
return newContext;
}
private ExecutionTypeContext contextForParameter(ExecutionTypeContext context) {
ExecutionTypeContext newContext = new ExecutionTypeContext(context.appInfo, context.resource, context.context, context.thisItem);
// append all of the defined variables from the context into the new context
if (context.definedVariables != null) {
for (String s : context.definedVariables.keySet()) {
newContext.setDefinedVariable(s, context.definedVariables.get(s));
}
}
return newContext;
}
private List<Base> funcNow(ExecutionContext context, List<Base> focus, ExpressionNode exp) {
@ -5368,6 +5508,20 @@ public class FHIRPathEngine {
return focus;
}
private List<Base> funcDefineVariable(ExecutionContext context, List<Base> focus, ExpressionNode exp) throws FHIRException {
List<Base> nl = execute(context, focus, exp.getParameters().get(0), true);
String name = nl.get(0).primitiveValue();
List<Base> value;
if (exp.getParameters().size() == 2) {
value = execute(context, focus, exp.getParameters().get(1), true);
} else {
value = focus;
}
// stash the variable into the context
context.setDefinedVariable(name, value);
return focus;
}
private List<Base> funcCheck(ExecutionContext context, List<Base> focus, ExpressionNode expr) throws FHIRException {
List<Base> n1 = execute(context, focus, expr.getParameters().get(0), true);
if (!convertToBoolean(n1)) {

6
org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/fhirpath/FHIRPathEngine.java
View File

@ -3202,12 +3202,14 @@ public class FHIRPathEngine {
} else if (s.startsWith("%`ext-")) {
return new TypeDetails(CollectionStatus.SINGLETON, TypeDetails.FP_String);
} else if (hostServices == null) {
String varName = s.substring(1);
if (context.hasDefinedVariable(varName))
return context.getDefinedVariable(varName);
throw makeException(expr, I18nConstants.FHIRPATH_UNKNOWN_CONSTANT, s);
} else {
String varName = s.substring(1);
if (context.hasDefinedVariable(varName)) {
if (context.hasDefinedVariable(varName))
return context.getDefinedVariable(varName);
}
TypeDetails v = hostServices.resolveConstantType(this, context.appInfo, s, explicitConstant);
if (v == null) {
throw makeException(expr, I18nConstants.FHIRPATH_UNKNOWN_CONSTANT, s);