Bug 92563 [content assist] Warm code assist performance for many types
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/text/java/CompletionProposalCollector.java
* <p>
	 * Implementations may return <code>null</code> if a proposal should not
	 * be included in the list presented to the user.
	 * </p>
	 * <p>
	 * Subclasses may extend or replace this method.
	 * </p>
	 *
	 * @param proposal the core completion proposal to create a UI proposal for
	 * @return the created java completion proposal, or <code>null</code> if
	 *         no proposal should be displayed
	 */
	protected IJavaCompletionProposal createJavaCompletionProposal(CompletionProposal proposal) {
		switch (proposal.getKind()) {
			case CompletionProposal.KEYWORD:
				return createKeywordProposal(proposal);
			case CompletionProposal.PACKAGE_REF:
				return createPackageProposal(proposal);
			case CompletionProposal.TYPE_REF:
				return createTypeProposal(proposal);
			case CompletionProposal.FIELD_REF:
				return createFieldProposal(proposal);
			case CompletionProposal.METHOD_REF:
			case CompletionProposal.METHOD_NAME_REFERENCE:
				return createMethodReferenceProposal(proposal);
			case CompletionProposal.METHOD_DECLARATION:
				return createMethodDeclarationProposal(proposal);
			case CompletionProposal.ANONYMOUS_CLASS_DECLARATION:
				return createAnonymousTypeProposal(proposal);
			case CompletionProposal.LABEL_REF: