How to use

CompletionProposalRequestor

in

org.eclipse.jdt.ls.core.internal.contentassist

CompletionProposalRequestor collector = new CompletionProposalRequestor(unit, offset);
collector.setAllowsRequiredProposals(CompletionProposal.FIELD_REF, CompletionProposal.TYPE_REF, true);
collector.setAllowsRequiredProposals(CompletionProposal.FIELD_REF, CompletionProposal.TYPE_IMPORT, true);
collector.setAllowsRequiredProposals(CompletionProposal.FIELD_REF, CompletionProposal.FIELD_IMPORT, true);
collector.setAllowsRequiredProposals(CompletionProposal.METHOD_REF, CompletionProposal.TYPE_REF, true);
collector.setAllowsRequiredProposals(CompletionProposal.METHOD_REF, CompletionProposal.TYPE_IMPORT, true);
collector.setAllowsRequiredProposals(CompletionProposal.METHOD_REF, CompletionProposal.METHOD_IMPORT, true);
collector.setAllowsRequiredProposals(CompletionProposal.CONSTRUCTOR_INVOCATION, CompletionProposal.TYPE_REF, true);
collector.setAllowsRequiredProposals(CompletionProposal.ANONYMOUS_CLASS_CONSTRUCTOR_INVOCATION, CompletionProposal.TYPE_REF, true);
collector.setAllowsRequiredProposals(CompletionProposal.ANONYMOUS_CLASS_DECLARATION, CompletionProposal.TYPE_REF, true);
collector.setAllowsRequiredProposals(CompletionProposal.TYPE_REF, CompletionProposal.TYPE_REF, true);
collector.setFavoriteReferences(getFavoriteStaticMembers());
    try {
      unit.codeComplete(offset, collector, subMonitor);
      proposals.addAll(collector.getCompletionItems());
      proposals.addAll(SnippetCompletionProposal.getSnippets(unit, collector.getContext(), subMonitor));
      proposals.addAll(new JavadocCompletionProposal().getProposals(unit, offset, collector, subMonitor));
    } catch (OperationCanceledException e) {

public CompletionProposalRequestor(ICompilationUnit aUnit, int offset) {
  this.unit = aUnit;
  response = new CompletionResponse();
  response.setOffset(offset);
  fIsTestCodeExcluded = !isTestSource(unit.getJavaProject(), unit);
  setRequireExtendedContext(true);
}

if (type != null && type.getCompilationUnit() != null) {
  final int offset = JsonRpcHelpers.toOffset(type.getCompilationUnit().getBuffer(), frame.location().lineNumber(), 0);
  CompletionProposalRequestor collector = new CompletionProposalRequestor(type.getCompilationUnit(), offset);
  collector.setAllowsRequiredProposals(CompletionProposal.FIELD_REF, CompletionProposal.TYPE_REF, true);
  collector.setAllowsRequiredProposals(CompletionProposal.FIELD_REF, CompletionProposal.TYPE_IMPORT, true);
  collector.setAllowsRequiredProposals(CompletionProposal.FIELD_REF, CompletionProposal.FIELD_IMPORT, true);
  collector.setAllowsRequiredProposals(CompletionProposal.METHOD_REF, CompletionProposal.TYPE_REF, true);
  collector.setAllowsRequiredProposals(CompletionProposal.METHOD_REF, CompletionProposal.TYPE_IMPORT, true);
  collector.setAllowsRequiredProposals(CompletionProposal.METHOD_REF, CompletionProposal.METHOD_IMPORT, true);
  collector.setAllowsRequiredProposals(CompletionProposal.CONSTRUCTOR_INVOCATION, CompletionProposal.TYPE_REF, true);
  collector.setAllowsRequiredProposals(CompletionProposal.ANONYMOUS_CLASS_CONSTRUCTOR_INVOCATION, CompletionProposal.TYPE_REF, true);
  collector.setAllowsRequiredProposals(CompletionProposal.ANONYMOUS_CLASS_DECLARATION, CompletionProposal.TYPE_REF, true);
  collector.setAllowsRequiredProposals(CompletionProposal.TYPE_REF, CompletionProposal.TYPE_REF, true);
  List<org.eclipse.lsp4j.CompletionItem> items = collector.getCompletionItems();

@Override
public void accept(CompletionProposal proposal) {
  if (!isIgnored(proposal.getKind())) {
    if (proposal.getKind() == CompletionProposal.POTENTIAL_METHOD_DECLARATION) {
      acceptPotentialMethodDeclaration(proposal);
    } else {
      if (proposal.getKind() == CompletionProposal.PACKAGE_REF && unit.getParent() != null && String.valueOf(proposal.getCompletion()).equals(unit.getParent().getElementName())) {
        // Hacky way to boost relevance of current package, for package completions, until
        // https://bugs.eclipse.org/518140 is fixed
        proposal.setRelevance(proposal.getRelevance() + 1);
      }
      proposals.add(proposal);
    }
  }
}

@Override
public void setIgnored(int completionProposalKind, boolean ignore) {
  super.setIgnored(completionProposalKind, ignore);
  if (completionProposalKind == CompletionProposal.METHOD_DECLARATION && !ignore) {
    setRequireExtendedContext(true);
  }
}

public CompletionItem toCompletionItem(CompletionProposal proposal, int index) {
  final CompletionItem $ = new CompletionItem();
  $.setKind(mapKind(proposal.getKind()));
  Map<String, String> data = new HashMap<>();
  // append data field so that resolve request can use it.
  data.put(CompletionResolveHandler.DATA_FIELD_URI, JDTUtils.toURI(unit));
  data.put(CompletionResolveHandler.DATA_FIELD_REQUEST_ID,String.valueOf(response.getId()));
  data.put(CompletionResolveHandler.DATA_FIELD_PROPOSAL_ID,String.valueOf(index));
  $.setData(data);
  this.descriptionProvider.updateDescription(proposal, $);
  $.setSortText(SortTextHelper.computeSortText(proposal));
  return $;
}

  return result;
String text = collector.getContext().getToken() == null ? "" : new String(collector.getContext().getToken());
StringBuilder buf = new StringBuilder(text);
IRegion prefix = findPrefixRange(d, line);