/*
* The MIT License
*
* Copyright (c) 2009 The Broad Institute
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package htsjdk.samtools;
import htsjdk.samtools.util.StringUtil;
/**
* Facility for converting between String and short representation of a SAM tag. short representation
* is used by SAM JDK internally and is much more efficient. Callers are encouraged to obtain the short
* value for a tag of interest once, and then use the SAMRecord attribute API that takes shorts rather than
* Strings.
*
* @author alecw@broadinstitute.org
*/
public class SAMTagUtil {
// Standard tags pre-computed for convenience
public final short RG = makeBinaryTag(SAMTag.RG.name());
public final short LB = makeBinaryTag(SAMTag.LB.name());
public final short PU = makeBinaryTag(SAMTag.PU.name());
public final short PG = makeBinaryTag(SAMTag.PG.name());
public final short AS = makeBinaryTag(SAMTag.AS.name());
public final short SQ = makeBinaryTag(SAMTag.SQ.name());
public final short MQ = makeBinaryTag(SAMTag.MQ.name());
public final short NM = makeBinaryTag(SAMTag.NM.name());
public final short H0 = makeBinaryTag(SAMTag.H0.name());
public final short H1 = makeBinaryTag(SAMTag.H1.name());
public final short H2 = makeBinaryTag(SAMTag.H2.name());
public final short UQ = makeBinaryTag(SAMTag.UQ.name());
public final short PQ = makeBinaryTag(SAMTag.PQ.name());
public final short NH = makeBinaryTag(SAMTag.NH.name());
public final short IH = makeBinaryTag(SAMTag.IH.name());
public final short HI = makeBinaryTag(SAMTag.HI.name());
public final short MD = makeBinaryTag(SAMTag.MD.name());
public final short CS = makeBinaryTag(SAMTag.CS.name());
public final short CQ = makeBinaryTag(SAMTag.CQ.name());
public final short CM = makeBinaryTag(SAMTag.CM.name());
public final short R2 = makeBinaryTag(SAMTag.R2.name());
public final short Q2 = makeBinaryTag(SAMTag.Q2.name());
public final short S2 = makeBinaryTag(SAMTag.S2.name());
public final short CC = makeBinaryTag(SAMTag.CC.name());
public final short CP = makeBinaryTag(SAMTag.CP.name());
public final short SM = makeBinaryTag(SAMTag.SM.name());
public final short AM = makeBinaryTag(SAMTag.AM.name());
public final short MF = makeBinaryTag(SAMTag.MF.name());
public final short E2 = makeBinaryTag(SAMTag.E2.name());
public final short U2 = makeBinaryTag(SAMTag.U2.name());
public final short OQ = makeBinaryTag(SAMTag.OQ.name());
public final short FZ = makeBinaryTag(SAMTag.FZ.name());
public final short SA = makeBinaryTag(SAMTag.SA.name());
public final short MC = makeBinaryTag(SAMTag.MC.name());
private static SAMTagUtil singleton;
// Cache of already-converted tags. Should speed up SAM text generation.
// Not synchronized because race condition is not a problem.
private final String[] stringTags = new String[Short.MAX_VALUE];
/**
* Despite the fact that this class has state, it should be thread-safe because the cache
* gets filled with the same values by any thread.
*/
public static SAMTagUtil getSingleton() {
if (singleton == null) {
singleton = new SAMTagUtil();
}
return singleton;
}
/**
* Convert from String representation of tag name to short representation.
*
* @param tag 2-character String representation of a tag name.
* @return Tag name packed as 2 ASCII bytes in a short.
*/
public short makeBinaryTag(final String tag) {
if (tag.length() != 2) {
throw new IllegalArgumentException("String tag does not have length() == 2: " + tag);
}
return (short)(tag.charAt(1) << 8 | tag.charAt(0));
}
/**
* Convert from short representation of tag name to String representation.
*
* @param tag Tag name packed as 2 ASCII bytes in a short.
* @return 2-character String representation of a tag name.
*/
public String makeStringTag(final short tag) {
String ret = stringTags[tag];
if (ret == null) {
final byte[] stringConversionBuf = new byte[2];
stringConversionBuf[0] = (byte)(tag & 0xff);
stringConversionBuf[1] = (byte)((tag >> 8) & 0xff);
ret = StringUtil.bytesToString(stringConversionBuf);
stringTags[tag] = ret;
}
return ret;
}
}