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/*-
* #%L
* HAPI FHIR - Core Library
* %%
* Copyright (C) 2014 - 2024 Smile CDR, Inc.
* %%
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* #L%
*/
package ca.uhn.fhir.util;
import ca.uhn.fhir.context.FhirContext;
import ca.uhn.fhir.i18n.Msg;
import jakarta.annotation.Nonnull;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.Validate;
import org.hl7.fhir.instance.model.api.IBase;
import org.hl7.fhir.instance.model.api.IBaseDatatype;
import org.hl7.fhir.instance.model.api.IBaseExtension;
import org.hl7.fhir.instance.model.api.IBaseHasExtensions;
import org.hl7.fhir.instance.model.api.IPrimitiveType;
import java.util.Collections;
import java.util.List;
import java.util.Optional;
import java.util.function.Predicate;
import java.util.stream.Collectors;
/**
* Utility for modifying with extensions in a FHIR version-independent approach.
*/
public class ExtensionUtil {
/**
* Non instantiable
*/
private ExtensionUtil() {
// nothing
}
/**
* Returns an extension with the specified URL creating one if it doesn't exist.
*
* @param theBase Base resource to get extension from
* @param theUrl URL for the extension
* @return Returns a extension with the specified URL.
* @throws IllegalArgumentException IllegalArgumentException is thrown in case resource doesn't support extensions
*/
public static IBaseExtension getOrCreateExtension(IBase theBase, String theUrl) {
IBaseHasExtensions baseHasExtensions = validateExtensionSupport(theBase);
IBaseExtension extension = getExtensionByUrl(baseHasExtensions, theUrl);
if (extension == null) {
extension = baseHasExtensions.addExtension();
extension.setUrl(theUrl);
}
return extension;
}
/**
* Returns an new empty extension.
*
* @param theBase Base resource to add the extension to
* @return Returns a new extension
* @throws IllegalArgumentException IllegalArgumentException is thrown in case resource doesn't support extensions
*/
public static IBaseExtension addExtension(IBase theBase) {
return addExtension(theBase, null);
}
/**
* Returns an extension with the specified URL
*
* @param theBase Base resource to add the extension to
* @param theUrl URL for the extension
* @return Returns a new extension with the specified URL.
* @throws IllegalArgumentException IllegalArgumentException is thrown in case resource doesn't support extensions
*/
public static IBaseExtension addExtension(IBase theBase, String theUrl) {
IBaseHasExtensions baseHasExtensions = validateExtensionSupport(theBase);
IBaseExtension extension = baseHasExtensions.addExtension();
if (theUrl != null) {
extension.setUrl(theUrl);
}
return extension;
}
/**
* Adds an extension with the specified value
*
* @param theBase The resource to update extension on
* @param theUrl Extension URL
* @param theValueType Type of the value to set in the extension
* @param theValue Extension value
* @param theFhirContext The context containing FHIR resource definitions
*/
public static void addExtension(
FhirContext theFhirContext, IBase theBase, String theUrl, String theValueType, Object theValue) {
IBaseExtension ext = addExtension(theBase, theUrl);
setExtension(theFhirContext, ext, theValueType, theValue);
}
private static IBaseHasExtensions validateExtensionSupport(IBase theBase) {
if (!(theBase instanceof IBaseHasExtensions)) {
throw new IllegalArgumentException(
Msg.code(1747) + String.format("Expected instance that supports extensions, but got %s", theBase));
}
return (IBaseHasExtensions) theBase;
}
/**
* Checks if the specified instance has an extension with the specified URL
*
* @param theBase The base resource to check extensions on
* @param theExtensionUrl URL of the extension
* @return Returns true if extension is exists and false otherwise
*/
public static boolean hasExtension(IBase theBase, String theExtensionUrl) {
IBaseHasExtensions baseHasExtensions;
try {
baseHasExtensions = validateExtensionSupport(theBase);
} catch (Exception e) {
return false;
}
return getExtensionByUrl(baseHasExtensions, theExtensionUrl) != null;
}
/**
* Checks if the specified instance has an extension with the specified URL
*
* @param theBase The base resource to check extensions on
* @param theExtensionUrl URL of the extension
* @return Returns true if extension is exists and false otherwise
*/
public static boolean hasExtension(IBase theBase, String theExtensionUrl, String theExtensionValue) {
if (!hasExtension(theBase, theExtensionUrl)) {
return false;
}
IBaseDatatype value = getExtensionByUrl(theBase, theExtensionUrl).getValue();
if (value == null) {
return theExtensionValue == null;
}
return value.toString().equals(theExtensionValue);
}
/**
* Gets the first extension with the specified URL
*
* @param theBase The resource to get the extension for
* @param theExtensionUrl URL of the extension to get. Must be non-null
* @return Returns the first available extension with the specified URL, or null if such extension doesn't exist
*/
public static IBaseExtension getExtensionByUrl(IBase theBase, String theExtensionUrl) {
Predicate> filter;
if (theExtensionUrl == null) {
filter = (e -> true);
} else {
filter = (e -> theExtensionUrl.equals(e.getUrl()));
}
return getExtensionsMatchingPredicate(theBase, filter).stream()
.findFirst()
.orElse(null);
}
/**
* Given a resource or other structure that can have direct extensions,
* pulls out any extensions that have the given theExtensionUrl and a primitive value type,
* and returns a list of the string version of the extension values.
*/
public static List getExtensionPrimitiveValues(IBase theBase, String theExtensionUrl) {
if (theBase instanceof IBaseHasExtensions) {
return ((IBaseHasExtensions) theBase)
.getExtension().stream()
.filter(t -> theExtensionUrl.equals(t.getUrl()))
.filter(t -> t.getValue() instanceof IPrimitiveType)
.map(t -> (IPrimitiveType) t.getValue())
.map(IPrimitiveType::getValueAsString)
.filter(StringUtils::isNotBlank)
.collect(Collectors.toList());
}
return Collections.emptyList();
}
/**
* Gets all extensions that match the specified filter predicate
*
* @param theBase The resource to get the extension for
* @param theFilter Predicate to match the extension against
* @return Returns all extension with the specified URL, or an empty list if such extensions do not exist
*/
public static List> getExtensionsMatchingPredicate(
IBase theBase, Predicate> theFilter) {
return validateExtensionSupport(theBase).getExtension().stream()
.filter(theFilter)
.collect(Collectors.toList());
}
/**
* Removes all extensions.
*
* @param theBase The resource to clear the extension for
* @return Returns all extension that were removed
*/
public static List> clearAllExtensions(IBase theBase) {
return clearExtensionsMatchingPredicate(theBase, (e -> true));
}
/**
* Removes all extensions by URL.
*
* @param theBase The resource to clear the extension for
* @param theUrl The url to clear extensions for
* @return Returns all extension that were removed
*/
public static List> clearExtensionsByUrl(IBase theBase, String theUrl) {
return clearExtensionsMatchingPredicate(theBase, (e -> theUrl.equals(e.getUrl())));
}
/**
* Removes all extensions that match the specified predicate
*
* @param theBase The base object to clear the extension for
* @param theFilter Defines which extensions should be cleared
* @return Returns all extension that were removed
*/
private static List> clearExtensionsMatchingPredicate(
IBase theBase, Predicate> theFilter) {
List> retVal = getExtensionsMatchingPredicate(theBase, theFilter);
validateExtensionSupport(theBase).getExtension().removeIf(theFilter);
return retVal;
}
/**
* Gets all extensions with the specified URL
*
* @param theBase The resource to get the extension for
* @param theExtensionUrl URL of the extension to get. Must be non-null
* @return Returns all extension with the specified URL, or an empty list if such extensions do not exist
*/
public static List> getExtensionsByUrl(IBaseHasExtensions theBase, String theExtensionUrl) {
Predicate> urlEqualityPredicate = e -> theExtensionUrl.equals(e.getUrl());
return getExtensionsMatchingPredicate(theBase, urlEqualityPredicate);
}
/**
* Sets value of the extension as a string
*
* @param theExtension The extension to set the value on
* @param theValue The value to set
* @param theFhirContext The context containing FHIR resource definitions
*/
public static void setExtension(FhirContext theFhirContext, IBaseExtension theExtension, String theValue) {
setExtension(theFhirContext, theExtension, "string", theValue);
}
/**
* Sets value of the extension
*
* @param theExtension The extension to set the value on
* @param theExtensionType Element type of the extension
* @param theValue The value to set
* @param theFhirContext The context containing FHIR resource definitions
*/
public static void setExtension(
FhirContext theFhirContext, IBaseExtension theExtension, String theExtensionType, Object theValue) {
theExtension.setValue(TerserUtil.newElement(theFhirContext, theExtensionType, theValue));
}
/**
* Sets or replaces existing extension with the specified value as a string
*
* @param theBase The resource to update extension on
* @param theUrl Extension URL
* @param theValue Extension value
* @param theFhirContext The context containing FHIR resource definitions
*/
public static void setExtensionAsString(FhirContext theFhirContext, IBase theBase, String theUrl, String theValue) {
IBaseExtension ext = getOrCreateExtension(theBase, theUrl);
setExtension(theFhirContext, ext, theValue);
}
/**
* Sets or replaces existing extension with the specified value
*
* @param theBase The resource to update extension on
* @param theUrl Extension URL
* @param theValueType Type of the value to set in the extension
* @param theValue Extension value
* @param theFhirContext The context containing FHIR resource definitions
*/
public static void setExtension(
FhirContext theFhirContext, IBase theBase, String theUrl, String theValueType, Object theValue) {
IBaseExtension ext = getOrCreateExtension(theBase, theUrl);
setExtension(theFhirContext, ext, theValueType, theValue);
}
/**
* Compares two extensions, returns true if they have the same value and url
*
* @param theLeftExtension : Extension to be evaluated #1
* @param theRightExtension : Extension to be evaluated #2
* @return Result of the comparison
*/
public static boolean equals(IBaseExtension theLeftExtension, IBaseExtension theRightExtension) {
return TerserUtil.equals(theLeftExtension, theRightExtension);
}
/**
* Given an extension, looks for the first child extension with the given URL of {@literal theChildExtensionUrl}
* and a primitive datatype value, and returns the String version of that value. E.g. if the
* value is a FHIR boolean, it would return the string "true" or "false. If the extension
* has no value, or the value is not a primitive datatype, or the URL is not found, the method
* will return {@literal null}.
*
* @param theExtension The parent extension. Must not be null.
* @param theChildExtensionUrl The child extension URL. Must not be null or blank.
* @since 6.6.0
*/
public static > String extractChildPrimitiveExtensionValue(
@Nonnull IBaseExtension theExtension, @Nonnull String theChildExtensionUrl) {
Validate.notNull(theExtension, "theExtension must not be null");
Validate.notBlank(theChildExtensionUrl, "theChildExtensionUrl must not be null or blank");
Optional codeExtension = theExtension.getExtension().stream()
.filter(t -> theChildExtensionUrl.equals(t.getUrl()))
.findFirst();
String retVal = null;
if (codeExtension.isPresent() && codeExtension.get().getValue() instanceof IPrimitiveType) {
IPrimitiveType codeValue =
(IPrimitiveType) codeExtension.get().getValue();
retVal = codeValue.getValueAsString();
}
return retVal;
}
}
