/**
* 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.store.pojo;
import java.lang.reflect.Field;
import org.apache.drill.common.types.TypeProtos.MajorType;
import org.apache.drill.exec.exception.SchemaChangeException;
import org.apache.drill.exec.expr.TypeHelper;
import org.apache.drill.exec.physical.impl.OutputMutator;
import org.apache.drill.exec.record.MaterializedField;
import org.apache.drill.exec.vector.ValueVector;
abstract class AbstractWriter<V extends ValueVector> implements PojoWriter{
protected final Field field;
protected V vector;
protected final MajorType type;
public AbstractWriter(Field field, MajorType type){
this.field = field;
this.type = type;
}
@Override
public void init(OutputMutator output) throws SchemaChangeException {
MaterializedField mf = MaterializedField.create(field.getName(), type);
@SuppressWarnings("unchecked")
Class<V> valueVectorClass = (Class<V>) TypeHelper.getValueVectorClass(type.getMinorType(), type.getMode());
this.vector = output.addField(mf, valueVectorClass);
}
@Override
public void allocate() {
vector.allocateNew();
}
public void setValueCount(int valueCount){
vector.getMutator().setValueCount(valueCount);
}
@Override
public void cleanup() {
}
}