/**
* 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.record.selection;
import io.netty.buffer.DrillBuf;
import java.io.Closeable;
import java.io.IOException;
import org.apache.drill.exec.memory.BufferAllocator;
import org.apache.drill.exec.record.DeadBuf;
/**
* A selection vector that fronts, at most, a
*/
public class SelectionVector2 implements Closeable{
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(SelectionVector2.class);
private final BufferAllocator allocator;
private int recordCount;
private DrillBuf buffer = DeadBuf.DEAD_BUFFER;
public static final int RECORD_SIZE = 2;
public SelectionVector2(BufferAllocator allocator) {
this.allocator = allocator;
}
public int getCount(){
return recordCount;
}
public DrillBuf getBuffer() {
return getBuffer(true);
}
public DrillBuf getBuffer(boolean clear) {
DrillBuf bufferHandle = this.buffer;
if (clear) {
/* Increment the ref count for this buffer */
bufferHandle.retain();
/* We are passing ownership of the buffer to the
* caller. clear the buffer from within our selection vector
*/
clear();
}
return bufferHandle;
}
public void setBuffer(DrillBuf bufferHandle)
{
/* clear the existing buffer */
clear();
this.buffer = bufferHandle;
buffer.retain();
}
public char getIndex(int index){
return buffer.getChar(index * RECORD_SIZE);
}
public void setIndex(int index, char value){
buffer.setChar(index * RECORD_SIZE, value);
}
public long getDataAddr(){
return buffer.memoryAddress();
}
public void setIndex(int index, int value){
buffer.setChar(index, value);
}
public boolean allocateNew(int size){
clear();
buffer = allocator.buffer(size * RECORD_SIZE);
if (buffer == null) {
return false;
}
return true;
}
public SelectionVector2 clone(){
SelectionVector2 newSV = new SelectionVector2(allocator);
newSV.recordCount = recordCount;
newSV.buffer = buffer;
/* Since buffer and newSV.buffer essentially point to the
* same buffer, if we don't do a retain() on the newSV's
* buffer, it might get freed.
*/
newSV.buffer.retain();
clear();
return newSV;
}
public void clear() {
if (buffer != null && buffer != DeadBuf.DEAD_BUFFER) {
buffer.release();
buffer = DeadBuf.DEAD_BUFFER;
recordCount = 0;
}
}
public void setRecordCount(int recordCount){
// logger.debug("Seting record count to {}", recordCount);
this.recordCount = recordCount;
}
@Override
public void close() throws IOException {
clear();
}
}