| /* |
| * 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.drill.exec.expr.fn; |
| |
| import org.apache.drill.common.expression.FieldReference; |
| import org.apache.drill.common.expression.FunctionHolderExpression; |
| import org.apache.drill.common.expression.fn.FuncHolder; |
| import org.apache.drill.exec.expr.ClassGenerator; |
| import org.apache.drill.exec.expr.ClassGenerator.HoldingContainer; |
| |
| import com.sun.codemodel.JVar; |
| |
| public abstract class AbstractFuncHolder implements FuncHolder { |
| |
| public abstract JVar[] renderStart(ClassGenerator<?> g, HoldingContainer[] inputVariables, FieldReference fieldReference); |
| |
| public void renderMiddle(ClassGenerator<?> g, HoldingContainer[] inputVariables, JVar[] workspaceJVars) { |
| // default implementation is add no code |
| } |
| |
| /** |
| * Generate methods body and complete the code generation. |
| * |
| * @param classGenerator the class responsible for code generation |
| * @param inputVariables the source of the vector holders |
| * @param workspaceJVars class fields |
| * @param holderExpr holder for the function expression |
| * @return HoldingContainer for return value |
| */ |
| public abstract HoldingContainer renderEnd(ClassGenerator<?> classGenerator, HoldingContainer[] inputVariables, |
| JVar[] workspaceJVars, FunctionHolderExpression holderExpr); |
| |
| @Override |
| public boolean isNested() { |
| return false; |
| } |
| |
| @Override |
| public boolean isComplexWriterFuncHolder() { |
| return false; |
| } |
| } |