/tags/release-0.0.0-rc0/hive/external/ql/src/java/org/apache/hadoop/hive/ql/lib/Dispatcher.java
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
- /**
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements. See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership. The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- package org.apache.hadoop.hive.ql.lib;
- import java.util.Stack;
- import org.apache.hadoop.hive.ql.parse.SemanticException;
- /**
- * Dispatcher interface for Operators Used in operator graph walking to dispatch
- * process/visitor functions for operators.
- */
- public interface Dispatcher {
- /**
- * Dispatcher function.
- *
- * @param nd
- * operator to process.
- * @param stack
- * operator stack to process.
- * @param nodeOutputs
- * The argument list of outputs from processing other nodes that are
- * passed to this dispatcher from the walker.
- * @return Object The return object from the processing call.
- * @throws SemanticException
- */
- Object dispatch(Node nd, Stack<Node> stack, Object... nodeOutputs)
- throws SemanticException;
- }