/**
* 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.vector.complex.impl;
import java.util.Iterator;
import org.apache.drill.common.types.TypeProtos.MajorType;
import org.apache.drill.common.types.Types;
import org.apache.drill.exec.expr.holders.UnionHolder;
import org.apache.drill.exec.record.MaterializedField;
import org.apache.drill.exec.vector.complex.reader.FieldReader;
import org.apache.drill.exec.vector.complex.writer.BaseWriter.ListWriter;
import org.apache.drill.exec.vector.complex.writer.FieldWriter;
abstract class AbstractBaseReader implements FieldReader{
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(AbstractBaseReader.class);
private int index;
public AbstractBaseReader() {
super();
}
public void setPosition(int index){
this.index = index;
}
int idx(){
return index;
}
@Override
public void reset() {
index = 0;
}
@Override
public Iterator<String> iterator() {
throw new IllegalStateException("The current reader doesn't support reading as a map.");
}
public MajorType getType(){
throw new IllegalStateException("The current reader doesn't support getting type information.");
}
@Override
public MaterializedField getField() {
return MaterializedField.create("unknown", Types.LATE_BIND_TYPE);
}
@Override
public boolean next() {
throw new IllegalStateException("The current reader doesn't support getting next information.");
}
@Override
public int size() {
throw new IllegalStateException("The current reader doesn't support getting size information.");
}
@Override
public void read(UnionHolder holder) {
holder.reader = this;
holder.isSet = this.isSet() ? 1 : 0;
}
@Override
public void read(int index, UnionHolder holder) {
throw new IllegalStateException("The current reader doesn't support reading union type");
}
@Override
public void copyAsValue(UnionWriter writer) {
throw new IllegalStateException("The current reader doesn't support reading union type");
}
@Override
public void copyAsValue(ListWriter writer) {
ComplexCopier.copy(this, (FieldWriter)writer);
}
}