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/tags/release-0.0.0-rc0/hive/external/ql/src/java/org/apache/hadoop/hive/ql/lib/Dispatcher.java

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Java | 47 lines | 7 code | 6 blank | 34 comment | 0 complexity | 76d2efd227aaed330f8bfd6bb2421116 MD5 | raw file
Possible License(s): Apache-2.0, BSD-3-Clause, JSON, CPL-1.0
  1. /**
  2. * Licensed to the Apache Software Foundation (ASF) under one
  3. * or more contributor license agreements. See the NOTICE file
  4. * distributed with this work for additional information
  5. * regarding copyright ownership. The ASF licenses this file
  6. * to you under the Apache License, Version 2.0 (the
  7. * "License"); you may not use this file except in compliance
  8. * with the License. You may obtain a copy of the License at
  9. *
  10. * http://www.apache.org/licenses/LICENSE-2.0
  11. *
  12. * Unless required by applicable law or agreed to in writing, software
  13. * distributed under the License is distributed on an "AS IS" BASIS,
  14. * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15. * See the License for the specific language governing permissions and
  16. * limitations under the License.
  17. */
  18. package org.apache.hadoop.hive.ql.lib;
  19. import java.util.Stack;
  20. import org.apache.hadoop.hive.ql.parse.SemanticException;
  21. /**
  22. * Dispatcher interface for Operators Used in operator graph walking to dispatch
  23. * process/visitor functions for operators.
  24. */
  25. public interface Dispatcher {
  26. /**
  27. * Dispatcher function.
  28. *
  29. * @param nd
  30. * operator to process.
  31. * @param stack
  32. * operator stack to process.
  33. * @param nodeOutputs
  34. * The argument list of outputs from processing other nodes that are
  35. * passed to this dispatcher from the walker.
  36. * @return Object The return object from the processing call.
  37. * @throws SemanticException
  38. */
  39. Object dispatch(Node nd, Stack<Node> stack, Object... nodeOutputs)
  40. throws SemanticException;
  41. }