Update docs
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jamesagnew
parent
9c712f2f0e
commit
b717c1f0c3
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@ -25,6 +25,11 @@
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<artifactId>hapi-fhir-structures-dstu2</artifactId>
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<version>1.4-SNAPSHOT</version>
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</dependency>
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<dependency>
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<groupId>ca.uhn.hapi.fhir</groupId>
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<artifactId>hapi-fhir-structures-dstu2.1</artifactId>
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<version>1.4-SNAPSHOT</version>
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</dependency>
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<dependency>
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<groupId>ca.uhn.hapi.fhir</groupId>
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<artifactId>hapi-fhir-structures-hl7org-dstu2</artifactId>
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@ -26,12 +26,11 @@ FhirContext ctxDstu2 = FhirContext.forDstu2();
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@SuppressWarnings("unused")
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public static void creatingContextHl7org() {
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// START SNIPPET: creatingContextHl7org
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// To use the RI structures, you need to specifically use a FhirContext configured
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// for HL7.org Structures
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FhirContext ctx = FhirContext.forDstu2Hl7Org();
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// Create a context for DSTU2.1
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FhirContext ctx = FhirContext.forDstu2_1();
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// Working with RI structures is similar to how it works with the HAPI structures
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org.hl7.fhir.instance.model.Patient patient = new org.hl7.fhir.instance.model.Patient();
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org.hl7.fhir.dstu21.model.Patient patient = new org.hl7.fhir.dstu21.model.Patient();
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patient.addName().addGiven("John").addFamily("Smith");
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patient.getBirthDateElement().setValueAsString("1998-02-22");
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@ -296,7 +296,7 @@
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<artifactId>maven-surefire-plugin</artifactId>
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<configuration>
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<runOrder>alphabetical</runOrder>
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<argLine>-Xmx1024m</argLine>
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<argLine>-Xmx1324m</argLine>
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</configuration>
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</plugin>
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<plugin>
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@ -46,10 +46,9 @@ import ca.uhn.fhir.context.FhirContext;
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public class FhirInstanceValidatorDstu21Test {
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private static final DefaultProfileValidationSupport VALIDATION_SUPPORT = new DefaultProfileValidationSupport();
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private static FhirContext ourCtx = FhirContext.forDstu2_1();
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private static final org.slf4j.Logger ourLog = org.slf4j.LoggerFactory.getLogger(FhirInstanceValidatorDstu21Test.class);
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private DefaultProfileValidationSupport myDefaultValidationSupport = VALIDATION_SUPPORT;
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private DefaultProfileValidationSupport myDefaultValidationSupport = new DefaultProfileValidationSupport();
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private FhirInstanceValidator myInstanceVal;
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private IValidationSupport myMockSupport;
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@ -70,7 +69,7 @@ public class FhirInstanceValidatorDstu21Test {
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myVal.setValidateAgainstStandardSchema(false);
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myVal.setValidateAgainstStandardSchematron(false);
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myInstanceVal = new FhirInstanceValidator(VALIDATION_SUPPORT);
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myInstanceVal = new FhirInstanceValidator(myDefaultValidationSupport);
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myVal.registerValidatorModule(myInstanceVal);
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mySupportedCodeSystemsForExpansion = new HashMap<String, ValueSet.ValueSetExpansionComponent>();
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@ -2,157 +2,39 @@
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<document xmlns="http://maven.apache.org/XDOC/2.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/XDOC/2.0 http://maven.apache.org/xsd/xdoc-2.0.xsd">
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<properties>
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<title>FHIR DSTU2 Support</title>
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<author email="jamesagnew@users.sourceforge.net">James Agnew</author>
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<title>FHIR DSTU2.1 Support</title>
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<author email="jamesagnew@gmail.com">James Agnew</author>
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</properties>
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<body>
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<section name="Working with DSTU2">
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<section name="Working with DSTU2.1">
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<p>
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Although DSTU2 has not yet been balloted and finalized by HL7,
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Although DSTU2.1 has not yet been balloted and finalized by HL7,
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there are several proposed changes which have been incorporated
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into the current
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<a href="http://hl7-fhir.github.io/">Continuous Integration Builds</a>
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of the FHIR specification itself and many (if not most) of these changes will
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end up in the final DSTU2 specification which is expected to be released
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in mid-to-late-2015.
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of the FHIR specification itself and many of these changes are used
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as a part of testing scenarios in FHIR Connectathons.
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</p>
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<p>
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DSTU2 is a significant upgrade to FHIR. While many things are unchanged,
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lots of things have changed. Some of the the more interesting differences include:
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</p>
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<ul>
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<li>
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A new
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<a href="http://hl7-fhir.github.io/bundle.html">Bundle</a>
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format which is no longer based on Atom. The new format does resemble the
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Atom format so it will not be unfamiliar to anyone who is used to DSTU1 bundles
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but it has a few differences. On a conceptual level FHIR now defines a Bundle as
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just another type of resource.
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</li>
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<li>
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New
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<a href="http://hl7-fhir.github.io/resource.html">"id" and "meta"</a>
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elements which are present on all resources and explicitly state the resource's
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ID, version, tags, and a few other things. All of these concepts had previously
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existed in FHIR but were not a part of the resource body itself (rather they lived
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in URLs and HTTP headers outside of the payload)
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</li>
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<li>
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Numerous changes to the model, including attribute changes to existing resources,
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the addition of a number of new resources, and the removal of a few redundant ones
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as well.
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</li>
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</ul>
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<subsection name="Supporting DSTU2 In your Applications">
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<p>
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As of HAPI FHIR 0.9, support for DSTU2 has been added to the library. Although upgrading
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existing applications from DSTU1 to DSTU2 will not be painless, we have
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tried as much as possible to make it easy.
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</p>
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<p>
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First, support for DSTU2 capabilities has been added in a second optional dependency JAR which
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you must add to your classpath. This JAR is called <code>hapi-structures-dstu2-[version].jar</code>.
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See the <a href="./download.html">download page</a> for information on adding this JAR.
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</p>
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<p>
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The FHIR version you are targeting is a property of the
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<a href="http://jamesagnew.github.io/hapi-fhir/apidocs/ca/uhn/fhir/context/FhirContext.html">FhirContext</a>.
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This means that if you use a FhirContext instance that is configured for DSTU2, any parsers, clients,
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servers, etc. which use that context will be operating in DSTU2 mode.
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</p>
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<p>
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To create a DSTU2 context, simply use the "forDstu2" factory method on the FhirContext class:
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</p>
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<macro name="snippet">
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<param name="id" value="context" />
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<param name="file" value="examples/src/main/java/example/Dstu2Examples.java" />
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</macro>
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</subsection>
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<subsection name="DSTU2 Servers">
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<p>
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To support DSTU2 in your server, simply set the FhirContext in the server to be
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one configured for DSTU2.
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</p>
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<macro name="snippet">
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<param name="id" value="server" />
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<param name="file" value="examples/src/main/java/example/Dstu2Examples.java" />
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</macro>
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<p>
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Note that it is possible to share your resource provider classes between
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servers supporting DSTU1 and servers supporting DSTU2 (including in the same WAR
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instance on the same web server). This should make the process of upgrading your
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server to the latest version of FHIR a bit easier.
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</p>
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</subsection>
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<subsection name="New Bundle Format">
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<p>
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In FHIR DSTU2, the Atom specification for Bundles has been dropped in
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favour of a new Bundle format that is a native FHIR resource. In order to
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support this change, a new Bundle structure class has been added to the
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resource structures in the DSTU2 structures JAR
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<a href="./apidocs-dstu2/ca/uhn/fhir/model/dstu2/resource/Bundle.html">here</a>.
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</p>
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<p>
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If you are working with Bundles directly in your application, it is recommended
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to migrate to this new bundle structure. The "old"
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<a href="./apidocs/ca/uhn/fhir/model/api/Bundle.html">Bundle</a>
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class will work, but the new one is generated from the FHIR specification so it
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is better aligned to the spec in terms of method names, JavaDocs, etc.
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</p>
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<p>
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Because the new bundle type is a resource like any other resource, you should
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parse and encode it using the
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<code><a href="./apidocs/ca/uhn/fhir/parser/IParser.html#parseResource(java.lang.Class,%20java.lang.String)">parseResource</a></code>
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and <code>encodeResource</code> methods instead of the previously used <code>parseBundle</code> and <code>encodeBundle</code>.
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</p>
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</subsection>
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</section>
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<section name="HL7.org "Reference Implementation" Structure Classes">
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<p>
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Since the early days of FHIR, HL7.org has provided an
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open source "Java Reference Implementation", which is an implementation
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of a FHIR data model, parser, and client in Java.
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HAPI has support for DSTU2.1 definitions, based on the snapshot
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of the resource definitions available at the time that
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a given version of HAPI is released. These structures are found
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in the <code>hapi-fhir-structures-dstu2.1-[version].jar</code>
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library, with the associated Schemas, ValueSets, and other
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textual resources being found in
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<code>hapi-fhir-validation-resources-[version].jar</code>.
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For information on where to find these libraries, see the
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<a href="./downloads.html">Downloads</a> page.
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</p>
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<p>
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HAPI was originally started as a separate Java implementation of FHIR,
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with a fairly different focus: implementing servers with an easily
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extendible data model. Over time though, the two Java implementations have
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shown a fair bit of overlap, so at the 2014
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<a href="http://fhir.furore.com/Events/DevDaysEval2014">DevDays</a> we decided
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to try and harmonize the two libraries.
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</p>
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<p>
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HAPI FHIR 1.1 begins the availability of a harmonized library.
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</p>
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<p>
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<b>For HAPI FHIR users:</b> This integration will bring the ability to use powerful features
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from the RI in your applications, such as the resource validator and the narrative
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generator.
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</p>
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<p>
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<b>For RI users:</b> This integration will bring the ability to use HAPI's client
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and server frameworks in your application, as well as the ability to take advantage
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of HAPI's code-first statically bound extension mechanism.
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Migrating to DSTU2.1 doesd require some effort, as the resource
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definitions have been migrated to use the "Reference Implementation"
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structures. These are the resource definitions supplied by HL7,
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meaning that the process to merge these two libraries has now
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begun.
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</p>
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<subsection name="The RI Data Model">
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@ -175,27 +57,21 @@
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All RI resource classes will be in the package <code>org.hl7.fhir.instance.model</code>,
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as shown below.
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</p>
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<img src="./images/hapi-1.1-structs-resource.png" alt="Structures"/>
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<img src="./images/hapi-1.1-structs-resource.svg" alt="Structures"/>
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<p>
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Datatypes will also be found inthe same package. Unlike HAPI datatype structures,
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which all end with "Dt", the RI primitive structure names end with "Type" and the
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RI composite structures have no suffix, as shown below.
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</p>
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<img src="./images/hapi-1.1-structs-datatypes.png" alt="Structures"/>
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<img src="./images/hapi-1.1-structs-datatypes.svg" alt="Structures"/>
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</subsection>
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<subsection name="Using the RI Structures in Your Application">
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<subsection name="Using the DSTU2.1 Structures in Your Application">
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<p>
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If you want to use the RI structures in your application,
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you will need to use the "hapi-fhir-structures-hl7org-dstu2-[version].jar"
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library.
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</p>
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<p>
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Using these structures is then similar to using other structures.
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Using these structures is similar to using other structures:
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</p>
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<macro name="snippet">
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@ -204,10 +80,10 @@
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</macro>
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</subsection>
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</section>
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<section name="Upgrading Existing Applications to HAPI FHIR 1.1">
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<section name="Upgrading Existing Applications to DSTU2.1">
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<p>
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If you have an existing application built using a version of previous
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@ -218,7 +94,8 @@
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</p>
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<p>
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For these methods, you may cast the <code>IBaseResource</code> to
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<code>IResource</code>.
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<code>IResource</code> if you are using DSTU2 structures, or to
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<code>IAnyResource</code> if you are using DSTU2.1 structures.
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</p>
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<p>
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@ -227,6 +104,105 @@
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if it's happening to you, it's happening to others. We're happy to help.
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</p>
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<subsection name="Code changes in DSTU2.1 Structrues">
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<p>
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The following is a list of things that have changed in the DSTU2.1
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structures which you will need to accomodate in your code as you
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upgrade:
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</p>
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<h4>Package Structure</h4>
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<ul>
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<li>
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Structures are all found in the
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<code>org.hl7.fhir.dstu21.model</code> package,
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instead of the <code>ca.uhn.fhir.model.dstu2.resource</code>,
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<code>ca.uhn.fhir.model.dstu2.composite</code>, and
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<code>ca.uhn.fhir.model.dstu2.valueset</code> packages.
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</li>
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</ul>
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<h4>Datatypes</h4>
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<ul>
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<li>
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<b>Primitive Types are renamed</b> from
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<code>[foo]Dt</code> to <code>[foo]Type</code>,
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e.g. <code>StringType</code> and <code>DecimalType</code>
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</li>
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<li>
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<b>Composite Types are renamed</b> from
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<code>[foo]Dt</code> to <code>[foo]</code>,
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e.g. <code>CodeableConcept</code> and <code>HumanName</code>
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</li>
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<li>
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<b>ResourceReferenceDt is renamed</b> to
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<code>Reference</code>
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<li>
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<b>Reference#getReference()</b> returns the reference text, where
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<code>Reference#getReferenceElement()</code> returns the <code>IdType</code>
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representing the reference.
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</li>
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</li>
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</ul>
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<h4>Setter Names</h4>
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<ul>
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<li>
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<b>Names for some component setters/mutators have changed
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in the new structures. In the old structures if the field
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type was a primitive (e.g. a string) there would be two
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setters: <code>setName(String)</code> and
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<code>setName(StringDt)</code>. In the new structures,
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the setters are called <code>setName(String)</code> and
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<code>setNameElement(StringType)</code>. This is more
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consistent with the way the getters are named.</b>
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</li>
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</ul>
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<h4>Resource Metadata</h4>
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<ul>
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<li>
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<b>Resource#getId() returns the string ID</b> (e.g. <code>http://example.com/Patient/1</code>)
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</li>
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<li>
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<b>Resource#getIdElement() returns the IdType</b> previously returned by <code>Resource#getId()</code>
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</li>
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<li>
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<b>Resource metadata (e.g. last update time, tags, etc.) lives in a</b>
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<code>Meta</code> object accessed using <code>Resource#getMeta()</code>
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instead of using the <code>#getResourceMetadata()</code> hashmap.
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<li><code>Resource#getMeta()#getLastUpdate()</code> returns the resource's last update time</li>
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<li><code>Resource#getMeta()#getTag()</code> returns the resource's tag list</li>
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<li><code>Resource#getMeta()#getProfile()</code> returns the resource's profile list</li>
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</li>
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</ul>
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<h4>Contained Resources</h4>
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<ul>
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<li><b>Resource#getContained() returns the list</b> of contained resources (previously it returned a useless ContainedDt object which held the list of contained resources)</li>
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</ul>
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<h4>Enums for ValueSets</h4>
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<ul>
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<li>Enums are named <code>[EnumName]</code> instead of <code>[EnumName]Enum</code>. For example, <code>ConditionVerificationStatusEnum</code> is now called <code>ConditionVerificationStatus</code></li>
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</ul>
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<h4>
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Resource/Datatype Components
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</h4>
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<ul>
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<li>
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The Java model classes representing sub-elements within a resource
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now have a longer name reflecting the containing element name and
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ending in "Component". For example, the Java structure representing
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the "Bundle.entry" component was called <code>Entry</code> in the HAPI structures
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but is called <code>BundleEntryComponent</code> in the RI structures.
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</li>
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</ul>
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</subsection>
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</section>
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</body>
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|
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