public boolean isRegistered(Type type) {
        return queryTypes.containsKey(type.getFullName());
    }
{@code TypeMappings} defines mappings from Java types to {@link Expression}, {@link Path} and
{@link TemplateExpression} types

@author tiwe
querydsl-codegen/src/main/java/com/querydsl/codegen/TypeMappings.java