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Technical Workflow

Save a complex obs and data:ConceptComplex conceptComplex = Context.getConceptService().getConceptComplex(1867);
// this is assumed to have happened
// conceptComplex.setHandler("ImageHandler");
 
// Set the required properties.
Obs obs = new Obs(new Person(48609), conceptComplex, new Date(), new Location());
 
BufferedImage img = ImageIO.read(new File("/home/bmckown/Desktop/test/logo.png"));
// or:
// InputStream img = new FileInputStream(new File("folder", "filename"));
 
ComplexData complexData = new ComplexData("test-image.jpg", img);
obs.setComplexData(complexData);
 
Context.getObsService().saveObs(obs, null);
 
// obs.getComplexData() will be null here
Retrieve a complex obs and its dataInteger obsId = obs.getObsId();
Obs complexObs = Context.getObsService().getComplexObs(obsId, OpenmrsConstants.RAW_VIEW);
ComplexData complexData = complexObs.getComplexData();
Object object = complexData.getData();
// object will be a BufferedImage object

        Obs complexObs = Context.getObsService().getComplexObs(videoObsId, OpenmrsConstants.RAW_VIEW);
        ComplexData complexData = complexObs.getComplexData();
        byte[] videoObjectData = ((byte[]) complexData.getData()); // cast Object --to--> byte array object

How to Create a ComplexObsHandler

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• Found in the org.openmrs.web.controller.observation.handler package
• Extends org.openmrs.obs.handler.ImageHandler
• NOTE! Uses ImageHandler to saveObs().
• Overrides the getComplexData() method to provide web-specific ComplexData

  • Provides hyperlink to ComplexObsServlet instead of the heavyweight data.

    Code Block
    public class WebImageHandler extends ImageHandler { public Obs getComplexData(Obs obs, String view) { if (Webutils.HYPERLINK_VIEW.equals(view)) { String link = "/ComplexObsServlet?obsId=" + obs.getObsId(); obs.set(new ComplexData("some title", link); return obs; } return super.getComplexObs(obs, view); } }

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• Register WebImageHandler in openmrs-servlet.xml so that it is only seen if used in the webapp...not in the jar alone.

• Or alternatively, for a module register in ModuleApplicationContext.xml

  Code Block
  <bean parent="obsServiceTarget" > <property name="handlers"> <map> <entry> <key><value>ImageHandler</value></key> <bean class="org.openmrs.web.controller.observation.handler.WebImageHandler"/> </entry> </map> </property> </bean>