// Copyright (C) 2011-2012 CRS4.
//
// This file is part of Seal.
//
// Seal is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// Seal is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with Seal. If not, see <http://www.gnu.org/licenses/>.
package it.crs4.seal.recab;
import it.crs4.seal.common.AbstractTaggedMapping;
import java.nio.ByteBuffer;
/**
* Quality covariate.
*
* For a given base i, returns its 0-based quality value as a string.
*
* TODO: profile!
*/
public class QualityCovariate implements Covariate
{
private int readLength = -1;
private ByteBuffer qualities;
private int startPos;
private static final byte SANGER_OFFSET = 33;
public void applyToMapping(AbstractTaggedMapping m)
{
readLength = m.getLength();
qualities = m.getBaseQualities();
startPos = qualities.position();
}
public String getValue(int pos)
{
if (readLength < 0)
throw new RuntimeException("BUG! readLength == " + readLength + ". applyToMapping not called before QualityCovariate.getValue");
else if (pos < 0 || pos >= readLength)
throw new IndexOutOfBoundsException("pos " + pos + " is out of read boundaries [0," + readLength + ")");
byte sangerValue = qualities.get(startPos + pos);
if (sangerValue < 33)
throw new RuntimeException("base quality value out of sanger range [33,127]. Found value: " + sangerValue + " (ASCII " + ((char)sangerValue));
return String.valueOf(sangerValue - SANGER_OFFSET);
}
}