![](/hapi-fhir/images/logos/raccoon-forwards.png)
001package org.hl7.fhir.r5.utils; 002 003import org.hl7.fhir.r5.model.Base; 004import org.hl7.fhir.r5.model.Element; 005import org.hl7.fhir.r5.model.Property; 006import org.hl7.fhir.r5.model.Resource; 007import org.hl7.fhir.r5.utils.ElementVisitor.ElementVisitorInstruction; 008 009public class ElementVisitor { 010 011 public enum ElementVisitorInstruction { 012 VISIT_CHILDREN, NO_VISIT_CHILDREN; 013 } 014 015 public interface IElementVisitor { 016 public ElementVisitorInstruction visit(Object context, Resource resource); 017 public ElementVisitorInstruction visit(Object context, Element element); 018 } 019 020 private IElementVisitor visitor; 021 022 public ElementVisitor(IElementVisitor visitor) { 023 this.visitor = visitor; 024 } 025 026 private void visitBase(Object context, Base base) { 027 for (Property p : base.children()) { 028 if (p.hasValues()) { 029 for (Base b : p.getValues()) { 030 if (b instanceof Resource) { 031 visit(context, (Resource) b); 032 } else { 033 visit(context, (Element) b); 034 } 035 } 036 } 037 } 038 } 039 040 public void visit(Object context, Resource res) { 041 ElementVisitorInstruction c = visitor.visit(context, res); 042 if (c == ElementVisitorInstruction.VISIT_CHILDREN) { 043 visitBase(context, res); 044 } 045 } 046 047 public void visit(Object context, Element e) { 048 ElementVisitorInstruction c = visitor.visit(context, e); 049 if (c == ElementVisitorInstruction.VISIT_CHILDREN) { 050 visitBase(context, e); 051 } 052 } 053 054}