| /** |
| * 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.tajo.plan.function; |
| |
| import com.google.gson.annotations.Expose; |
| import org.apache.tajo.catalog.FunctionDesc; |
| import org.apache.tajo.datum.Datum; |
| import org.apache.tajo.exception.TajoRuntimeException; |
| import org.apache.tajo.exception.UnsupportedException; |
| import org.apache.tajo.storage.Tuple; |
| |
| import java.io.IOException; |
| |
| /** |
| * An abstract class for actual function invocation. |
| * The metadata for function invocation are stored in the {@link org.apache.tajo.function.FunctionInvocation} class. |
| */ |
| public abstract class FunctionInvoke implements Cloneable { |
| @Expose protected FunctionDesc functionDesc; |
| |
| public FunctionInvoke() { |
| |
| } |
| |
| public FunctionInvoke(FunctionDesc functionDesc) { |
| this.functionDesc = functionDesc; |
| } |
| |
| public static FunctionInvoke newInstance(FunctionDesc desc) { |
| if (desc.getInvocation().hasLegacy()) { |
| return new ClassBasedScalarFunctionInvoke(desc); |
| } else if (desc.getInvocation().hasPython()) { |
| return new PythonFunctionInvoke(desc); |
| } else if (desc.getInvocation().hasHiveUDF()) { |
| return new HiveFunctionInvoke(desc); |
| } else { |
| throw new TajoRuntimeException(new UnsupportedException("function invocation '" + desc.getInvocation() + "'")); |
| } |
| } |
| |
| public void setFunctionDesc(FunctionDesc functionDesc) { |
| this.functionDesc = functionDesc; |
| } |
| |
| public abstract void init(FunctionInvokeContext context) throws IOException; |
| |
| /** |
| * Evaluate the given tuple with a function |
| * @param tuple a tuple evaluated with parameters |
| * @return a result of a fuction execution |
| */ |
| public abstract Datum eval(Tuple tuple); |
| |
| @Override |
| public boolean equals(Object o) { |
| if (o instanceof FunctionInvoke) { |
| FunctionInvoke other = (FunctionInvoke) o; |
| return this.functionDesc.equals(other.functionDesc); |
| } |
| return false; |
| } |
| |
| @Override |
| public int hashCode() { |
| return functionDesc.hashCode(); |
| } |
| |
| @Override |
| public Object clone() throws CloneNotSupportedException { |
| FunctionInvoke clone = (FunctionInvoke) super.clone(); |
| clone.functionDesc = (FunctionDesc) this.functionDesc.clone(); |
| return clone; |
| } |
| } |