/**
* 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.ref.eval;
import org.apache.drill.common.expression.LogicalExpression;
import org.apache.drill.common.expression.SchemaPath;
import org.apache.drill.common.expression.visitors.ExprVisitor;
import org.apache.drill.common.expression.visitors.SimpleExprVisitor;
import org.apache.drill.common.logical.data.NamedExpression;
import org.apache.drill.exec.ref.IteratorRegistry;
import org.apache.drill.exec.ref.RecordPointer;
import org.apache.drill.exec.ref.eval.EvaluatorTypes.AggregatingEvaluator;
import org.apache.drill.exec.ref.eval.EvaluatorTypes.BasicEvaluator;
import org.apache.drill.exec.ref.eval.EvaluatorTypes.BooleanEvaluator;
import org.apache.drill.exec.ref.eval.EvaluatorTypes.ConnectedEvaluator;
import org.apache.drill.exec.ref.eval.fn.agg.AggregatingWrapperEvaluator;
import org.apache.drill.exec.ref.values.DataValue;
import org.apache.drill.exec.ref.values.ValueReader;
public class BasicEvaluatorFactory extends EvaluatorFactory{
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(BasicEvaluatorFactory.class);
public BasicEvaluatorFactory(IteratorRegistry registry){
}
private SimpleExprVisitor<BasicEvaluator> get(RecordPointer record){
return new SimpleEvaluationVisitor(record);
}
@Override
public BasicEvaluator getBasicEvaluator(RecordPointer inputRecord, LogicalExpression e) {
return e.accept(get(inputRecord), null);
}
@Override
public AggregatingEvaluator getAggregatingOperator(RecordPointer record, LogicalExpression e) {
SimpleEvaluationVisitor visitor = new SimpleEvaluationVisitor(record);
BasicEvaluator b = e.accept(visitor, null);
return new AggregatingWrapperEvaluator(visitor.getAggregators(), b);
}
@Override
public BooleanEvaluator getBooleanEvaluator(RecordPointer record, LogicalExpression e) {
return new BooleanEvaluatorImpl(e.accept(get(record), null));
}
@Override
public ConnectedEvaluator getConnectedEvaluator(RecordPointer record, NamedExpression ne) {
return new ConnectedEvaluatorImpl(record, ne);
}
private class BooleanEvaluatorImpl implements BooleanEvaluator{
private BasicEvaluator eval;
public BooleanEvaluatorImpl(BasicEvaluator e){
this.eval = e;
}
@Override
public boolean eval() {
return ValueReader.getBoolean(eval.eval());
}
}
private class ConnectedEvaluatorImpl implements ConnectedEvaluator{
private SchemaPath outputPath;
private BasicEvaluator eval;
private RecordPointer record;
public ConnectedEvaluatorImpl(RecordPointer record, NamedExpression e){
this.outputPath = e.getRef();
this.record = record;
this.eval = e.getExpr().accept(get(record), null);
}
@Override
public void eval() {
DataValue val = eval.eval();
record.addField(outputPath, val);
}
}
}