1. /*
  2. * Copyright 1999-2004 The Apache Software Foundation
  3. *
  4. * Licensed under the Apache License, Version 2.0 (the "License");
  5. * you may not use this file except in compliance with the License.
  6. * You may obtain a copy of the License at
  7. *
  8. * http://www.apache.org/licenses/LICENSE-2.0
  9. *
  10. * Unless required by applicable law or agreed to in writing, software
  11. * distributed under the License is distributed on an "AS IS" BASIS,
  12. * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13. * See the License for the specific language governing permissions and
  14. * limitations under the License.
  15. */
  16. package org.apache.commons.jxpath;
  17. import java.util.Set;
  18. /**
  19. * A group of Function objects sharing a common namespace or a set of
  20. * common namespaces. Use the classes
  21. * {@link ClassFunctions ClassFunctions} and
  22. * {@link PackageFunctions PackageFunctions}
  23. * to register extension functions implemented as Java methods.
  24. *
  25. * @author Dmitri Plotnikov
  26. * @version $Revision: 1.7 $ $Date: 2004/02/29 14:17:42 $
  27. */
  28. public interface Functions {
  29. /**
  30. * Returns all namespaces in which this function collection defines
  31. * functions.
  32. */
  33. Set getUsedNamespaces();
  34. /**
  35. * Returns a Function, if any, for the specified namespace,
  36. * name and parameter types.
  37. */
  38. Function getFunction(String namespace, String name, Object[] parameters);
  39. }