/*
* 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.physical.impl.project;
import java.util.List;
import javax.inject.Named;
import org.apache.drill.exec.exception.SchemaChangeException;
import org.apache.drill.exec.ops.FragmentContext;
import org.apache.drill.exec.record.BatchSchema.SelectionVectorMode;
import org.apache.drill.exec.record.RecordBatch;
import org.apache.drill.exec.record.TransferPair;
import org.apache.drill.exec.record.selection.SelectionVector2;
import org.apache.drill.exec.record.selection.SelectionVector4;
import com.google.common.collect.ImmutableList;
public abstract class ProjectorTemplate implements Projector {
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(ProjectorTemplate.class);
private ImmutableList<TransferPair> transfers;
private SelectionVector2 vector2;
private SelectionVector4 vector4;
private SelectionVectorMode svMode;
public ProjectorTemplate() {
}
@Override
public final int projectRecords(int startIndex, final int recordCount, int firstOutputIndex) {
switch (svMode) {
case FOUR_BYTE:
throw new UnsupportedOperationException();
case TWO_BYTE:
final int count = recordCount;
for (int i = 0; i < count; i++, firstOutputIndex++) {
try {
doEval(vector2.getIndex(i), firstOutputIndex);
} catch (SchemaChangeException e) {
throw new UnsupportedOperationException(e);
}
}
return recordCount;
case NONE:
final int countN = recordCount;
int i;
for (i = startIndex; i < startIndex + countN; i++, firstOutputIndex++) {
try {
doEval(i, firstOutputIndex);
} catch (SchemaChangeException e) {
throw new UnsupportedOperationException(e);
}
}
if (i < startIndex + recordCount || startIndex > 0) {
for (TransferPair t : transfers) {
t.splitAndTransfer(startIndex, i - startIndex);
}
return i - startIndex;
}
for (TransferPair t : transfers) {
t.transfer();
}
return recordCount;
default:
throw new UnsupportedOperationException();
}
}
@Override
public final void setup(FragmentContext context, RecordBatch incoming, RecordBatch outgoing, List<TransferPair> transfers) throws SchemaChangeException{
this.svMode = incoming.getSchema().getSelectionVectorMode();
switch (svMode) {
case FOUR_BYTE:
this.vector4 = incoming.getSelectionVector4();
break;
case TWO_BYTE:
this.vector2 = incoming.getSelectionVector2();
break;
}
this.transfers = ImmutableList.copyOf(transfers);
doSetup(context, incoming, outgoing);
}
public abstract void doSetup(@Named("context") FragmentContext context,
@Named("incoming") RecordBatch incoming,
@Named("outgoing") RecordBatch outgoing)
throws SchemaChangeException;
public abstract void doEval(@Named("inIndex") int inIndex,
@Named("outIndex") int outIndex)
throws SchemaChangeException;
}