/**
* 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.expr;
import com.google.gson.annotations.Expose;
import org.apache.tajo.OverridableConf;
import org.apache.tajo.catalog.FunctionDesc;
import org.apache.tajo.catalog.Schema;
import org.apache.tajo.datum.Datum;
import org.apache.tajo.datum.NullDatum;
import org.apache.tajo.plan.function.FunctionInvoke;
import org.apache.tajo.plan.function.FunctionInvokeContext;
import org.apache.tajo.storage.Tuple;
import java.io.IOException;
public class GeneralFunctionEval extends FunctionEval {
protected FunctionInvoke funcInvoke;
@Expose protected FunctionInvokeContext invokeContext;
public GeneralFunctionEval(OverridableConf queryContext, FunctionDesc desc, EvalNode[] givenArgs) {
super(EvalType.FUNCTION, desc, givenArgs);
this.invokeContext = new FunctionInvokeContext(queryContext, getParamType());
}
@Override
public EvalNode bind(EvalContext evalContext, Schema schema) {
super.bind(evalContext, schema);
try {
this.funcInvoke = FunctionInvoke.newInstance(funcDesc);
if (evalContext != null) {
if (evalContext.hasScriptEngine(this)) {
this.invokeContext.setScriptEngine(evalContext.getScriptEngine(this));
}
if (evalContext.hasTimeZone()) {
this.invokeContext.setTimeZone(evalContext.getTimeZone());
}
}
this.funcInvoke.init(invokeContext);
} catch (IOException e) {
throw new RuntimeException(e);
}
return this;
}
@Override
@SuppressWarnings("unchecked")
public Datum eval(Tuple tuple) {
super.eval(tuple);
Datum datum = funcInvoke.eval(evalParams(tuple));
if (datum == null) {
return NullDatum.get();
} else {
return datum;
}
}
@Override
public Object clone() throws CloneNotSupportedException {
GeneralFunctionEval eval = (GeneralFunctionEval) super.clone();
if (funcInvoke != null) {
eval.funcInvoke = (FunctionInvoke) funcInvoke.clone();
}
return eval;
}
}