Add LSP command for getting ELM JSON

ls/server/src/main/java/org/opencds/cqf/cql/ls/server/command/ViewElmCommandContribution.java

@@ -1,7 +1,9 @@
 package org.opencds.cqf.cql.ls.server.command;
 
 import java.net.URI;
+import java.util.Arrays;
 import java.util.Collections;
+import java.util.HashSet;
 import java.util.Set;
 import java.util.concurrent.CompletableFuture;
 import org.cqframework.cql.cql2elm.CqlTranslator;
@@ -13,6 +15,7 @@
 
 public class ViewElmCommandContribution implements CommandContribution {
     private static final String VIEW_ELM_COMMAND = "org.opencds.cqf.cql.ls.viewElm";
+    private static final String VIEW_ELM_JSON_COMMAND = "org.opencds.cqf.cql.ls.viewElmJson";
 
     private final CqlTranslationManager cqlTranslationManager;
 
@@ -22,31 +25,32 @@ public ViewElmCommandContribution(CqlTranslationManager cqlTranslationManager) {
 
     @Override
     public Set<String> getCommands() {
-        return Collections.singleton(VIEW_ELM_COMMAND);
+        return Collections.unmodifiableSet(new HashSet<>(Arrays.asList(VIEW_ELM_COMMAND, VIEW_ELM_JSON_COMMAND)));
     }
 
     @Override
     public CompletableFuture<Object> executeCommand(ExecuteCommandParams params) {
         switch (params.getCommand()) {
             case VIEW_ELM_COMMAND:
-                return this.viewElm(params);
+                return this.viewElm(params, true);
+            case VIEW_ELM_JSON_COMMAND:
+                return this.viewElm(params, false);
             default:
                 return CommandContribution.super.executeCommand(params);
         }
     }
 
     // There's currently not a "show text file" or similar command in the LSP spec,
     // So it's not client agnostic. The client has to know that the result of this
-    // command
-    // is XML and display it accordingly.
-    private CompletableFuture<Object> viewElm(ExecuteCommandParams params) {
+    // command is XML or JSON and display it accordingly.
+    private CompletableFuture<Object> viewElm(ExecuteCommandParams params, Boolean isXml) {
         String uriString = ((JsonElement) params.getArguments().get(0)).getAsString();
         try {
 
             URI uri = Uris.parseOrNull(uriString);
             CqlTranslator translator = this.cqlTranslationManager.translate(uri);
             if (translator != null) {
-                return CompletableFuture.completedFuture(translator.toXml());
+                return CompletableFuture.completedFuture(isXml ? translator.toXml() : translator.toJson());
             }
 
             return CompletableFuture.completedFuture(null);