| /* |
| * 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.pig.parser; |
| |
| import org.apache.pig.ComparisonFunc; |
| import org.apache.pig.EvalFunc; |
| import org.apache.pig.LoadFunc; |
| import org.apache.pig.PigToStream; |
| import org.apache.pig.StoreFuncInterface; |
| import org.apache.pig.StreamToPig; |
| |
| class FunctionType { |
| public static final byte UNKNOWNFUNC = 0; |
| public static final byte EVALFUNC = 2; |
| public static final byte COMPARISONFUNC = 4; |
| public static final byte LOADFUNC = 8; |
| public static final byte STOREFUNC = 16; |
| public static final byte PIGTOSTREAMFUNC = 32; |
| public static final byte STREAMTOPIGFUNC = 64; |
| |
| public static void tryCasting(Class<?> func, byte funcType) { |
| Class<?> typeClass; |
| switch(funcType) { |
| case FunctionType.EVALFUNC: |
| typeClass = EvalFunc.class; |
| break; |
| case FunctionType.COMPARISONFUNC: |
| typeClass = ComparisonFunc.class; |
| break; |
| case FunctionType.LOADFUNC: |
| typeClass = LoadFunc.class; |
| break; |
| case FunctionType.STOREFUNC: |
| typeClass = StoreFuncInterface.class; |
| break; |
| case FunctionType.PIGTOSTREAMFUNC: |
| typeClass = PigToStream.class; |
| break; |
| case FunctionType.STREAMTOPIGFUNC: |
| typeClass = StreamToPig.class; |
| break; |
| default: |
| throw new IllegalArgumentException("Received an unknown function type: " + funcType); |
| } |
| if (!typeClass.isAssignableFrom(func)) { |
| throw new ClassCastException(func + " does not implement " + typeClass); |
| } |
| } |
| |
| }; |
| |