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/**
* 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 java.util.List;
import org.apache.drill.common.expression.ExpressionPosition;
import org.apache.drill.common.expression.FunctionHolderExpression;
import org.apache.drill.common.expression.LogicalExpression;
import org.apache.drill.common.expression.fn.FuncHolder;
import org.apache.drill.common.types.TypeProtos.MajorType;
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);
public void renderMiddle(ClassGenerator<?> g, HoldingContainer[] inputVariables, JVar[] workspaceJVars) {
// default implementation is add no code
}
public abstract HoldingContainer renderEnd(ClassGenerator<?> g, HoldingContainer[] inputVariables, JVar[] workspaceJVars);
public boolean isNested() {
return false;
}
public abstract FunctionHolderExpression getExpr(String name, List<LogicalExpression> args, ExpressionPosition pos);
public abstract MajorType getParmMajorType(int i);
public abstract int getParamCount();
}
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