org.biojavax.bio.seq.io
Class FastaFormat

java.lang.Object
  extended by org.biojavax.bio.seq.io.RichSequenceFormat.BasicFormat
      extended by org.biojavax.bio.seq.io.RichSequenceFormat.HeaderlessFormat
          extended by org.biojavax.bio.seq.io.FastaFormat
All Implemented Interfaces:
SequenceFormat, RichSequenceFormat

public class FastaFormat
extends RichSequenceFormat.HeaderlessFormat

Format object representing FASTA files. These files are almost pure sequence data.

Since:
1.5
Author:
Thomas Down, Matthew Pocock, Greg Cox, Lukas Kall, Richard Holland

Nested Class Summary
 
Nested classes/interfaces inherited from interface org.biojavax.bio.seq.io.RichSequenceFormat
RichSequenceFormat.BasicFormat, RichSequenceFormat.HeaderlessFormat
 
Field Summary
protected static Pattern aminoAcids
           
protected static Pattern dp
           
static String FASTA_FORMAT
          The name of this format
protected static Pattern hp
           
protected static Pattern readableFiles
           
 
Constructor Summary
FastaFormat()
           
 
Method Summary
 boolean canRead(BufferedInputStream stream)
          Check to see if a given stream is in our format. A stream is in FASTA format if the stream starts with ">".
 boolean canRead(File file)
          Check to see if a given file is in our format. Some formats may be able to determine this by filename, whilst others may have to open the file and read it to see what format it is in. A file is in FASTA format if the name ends with fa or fas, or the file starts with ">".
 String getDefaultFormat()
          getDefaultFormat returns the String identifier for the default sub-format written by a SequenceFormat implementation.
 SymbolTokenization guessSymbolTokenization(BufferedInputStream stream)
          On the assumption that the stream is readable by this format (not checked), attempt to guess which symbol tokenization we should use to read it. Returns an protein parser if the first line of sequence contains any of F/L/I/P/Q/E, otherwise returns a DNA tokenizer.
 SymbolTokenization guessSymbolTokenization(File file)
          On the assumption that the file is readable by this format (not checked), attempt to guess which symbol tokenization we should use to read it. For formats that only accept one tokenization, just return it without checking the file. For formats that accept multiple tokenizations, its up to you how you do it. Returns an protein parser if the first line of sequence contains any of F/L/I/P/Q/E, otherwise returns a DNA tokenizer.
 boolean readRichSequence(BufferedReader reader, SymbolTokenization symParser, RichSeqIOListener rsiol, Namespace ns)
          Reads a sequence from the given buffered reader using the given tokenizer to parse sequence symbols. If namespace is null, then the namespace of the sequence in the fasta is used.
 boolean readSequence(BufferedReader reader, SymbolTokenization symParser, SeqIOListener listener)
          Read a sequence and pass data on to a SeqIOListener.
 void writeSequence(Sequence seq, Namespace ns)
          Writes a sequence out to the outputstream given by beginWriting() using the default format of the implementing class. If namespace is null, then the sequence's own namespace is used.
 void writeSequence(Sequence seq, PrintStream os)
          writeSequence writes a sequence to the specified PrintStream, using the default format.
 void writeSequence(Sequence seq, String format, PrintStream os)
          writeSequence writes a sequence to the specified PrintStream, using the specified format.
 
Methods inherited from class org.biojavax.bio.seq.io.RichSequenceFormat.HeaderlessFormat
beginWriting, finishWriting
 
Methods inherited from class org.biojavax.bio.seq.io.RichSequenceFormat.BasicFormat
getElideComments, getElideFeatures, getElideReferences, getElideSymbols, getLineWidth, getPrintStream, setElideComments, setElideFeatures, setElideReferences, setElideSymbols, setLineWidth, setPrintStream
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

FASTA_FORMAT

public static final String FASTA_FORMAT
The name of this format

See Also:
Constant Field Values

hp

protected static final Pattern hp

dp

protected static final Pattern dp

readableFiles

protected static final Pattern readableFiles

aminoAcids

protected static final Pattern aminoAcids
Constructor Detail

FastaFormat

public FastaFormat()
Method Detail

canRead

public boolean canRead(File file)
                throws IOException
Check to see if a given file is in our format. Some formats may be able to determine this by filename, whilst others may have to open the file and read it to see what format it is in. A file is in FASTA format if the name ends with fa or fas, or the file starts with ">".

Specified by:
canRead in interface RichSequenceFormat
Overrides:
canRead in class RichSequenceFormat.BasicFormat
Parameters:
file - the File to check.
Returns:
true if the file is readable by this format, false if not.
Throws:
IOException - in case the file is inaccessible.

guessSymbolTokenization

public SymbolTokenization guessSymbolTokenization(File file)
                                           throws IOException
On the assumption that the file is readable by this format (not checked), attempt to guess which symbol tokenization we should use to read it. For formats that only accept one tokenization, just return it without checking the file. For formats that accept multiple tokenizations, its up to you how you do it. Returns an protein parser if the first line of sequence contains any of F/L/I/P/Q/E, otherwise returns a DNA tokenizer.

Specified by:
guessSymbolTokenization in interface RichSequenceFormat
Overrides:
guessSymbolTokenization in class RichSequenceFormat.BasicFormat
Parameters:
file - the File object to guess the format of.
Returns:
a SymbolTokenization to read the file with.
Throws:
IOException - if the file is unrecognisable or inaccessible.

canRead

public boolean canRead(BufferedInputStream stream)
                throws IOException
Check to see if a given stream is in our format. A stream is in FASTA format if the stream starts with ">".

Parameters:
stream - the BufferedInputStream to check.
Returns:
true if the stream is readable by this format, false if not.
Throws:
IOException - in case the stream is inaccessible.

guessSymbolTokenization

public SymbolTokenization guessSymbolTokenization(BufferedInputStream stream)
                                           throws IOException
On the assumption that the stream is readable by this format (not checked), attempt to guess which symbol tokenization we should use to read it. For formats that only accept one tokenization, just return it without checking the stream. For formats that accept multiple tokenizations, its up to you how you do it. Returns an protein parser if the first line of sequence contains any of F/L/I/P/Q/E, otherwise returns a DNA tokenizer.

Parameters:
stream - the BufferedInputStream object to guess the format of.
Returns:
a SymbolTokenization to read the stream with.
Throws:
IOException - if the stream is unrecognisable or inaccessible.

readSequence

public boolean readSequence(BufferedReader reader,
                            SymbolTokenization symParser,
                            SeqIOListener listener)
                     throws IllegalSymbolException,
                            IOException,
                            ParseException
Read a sequence and pass data on to a SeqIOListener.

Parameters:
reader - The stream of data to parse.
symParser - A SymbolParser defining a mapping from character data to Symbols.
listener - A listener to notify when data is extracted from the stream.
Returns:
a boolean indicating whether or not the stream contains any more sequences.
Throws:
IllegalSymbolException - if it is not possible to translate character data from the stream into valid BioJava symbols.
IOException - if an error occurs while reading from the stream.
ParseException

readRichSequence

public boolean readRichSequence(BufferedReader reader,
                                SymbolTokenization symParser,
                                RichSeqIOListener rsiol,
                                Namespace ns)
                         throws IllegalSymbolException,
                                IOException,
                                ParseException
Reads a sequence from the given buffered reader using the given tokenizer to parse sequence symbols. Events are passed to the listener, and the namespace used for sequences read is the one given. If the namespace is null, then the default namespace for the parser is used, which may depend on individual implementations of this interface. If namespace is null, then the namespace of the sequence in the fasta is used. If the namespace is null and so is the namespace of the sequence in the fasta, then the default namespace is used.

Parameters:
reader - the input source
symParser - the tokenizer which understands the sequence being read
rsiol - the listener to send sequence events to
ns - the namespace to read sequences into.
Returns:
true if there is more to read after this, false otherwise.
Throws:
IllegalSymbolException - if the tokenizer couldn't understand one of the sequence symbols in the file.
IOException - if there was a read error.
ParseException

writeSequence

public void writeSequence(Sequence seq,
                          PrintStream os)
                   throws IOException
writeSequence writes a sequence to the specified PrintStream, using the default format.

Parameters:
seq - the sequence to write out.
os - the printstream to write to.
Throws:
IOException

writeSequence

public void writeSequence(Sequence seq,
                          String format,
                          PrintStream os)
                   throws IOException
writeSequence writes a sequence to the specified PrintStream, using the specified format.

Parameters:
seq - a Sequence to write out.
format - a String indicating which sub-format of those available from a particular SequenceFormat implemention to use when writing.
os - a PrintStream object.
Throws:
IOException - if an error occurs.

writeSequence

public void writeSequence(Sequence seq,
                          Namespace ns)
                   throws IOException
Writes a sequence out to the outputstream given by beginWriting() using the default format of the implementing class. If namespace is given, sequences will be written with that namespace, otherwise they will be written with the default namespace of the implementing class (which is usually the namespace of the sequence itself). If you pass this method a sequence which is not a RichSequence, it will attempt to convert it using RichSequence.Tools.enrich(). Obviously this is not going to guarantee a perfect conversion, so it's better if you just use RichSequences to start with! If namespace is null, then the sequence's own namespace is used.

Parameters:
seq - the sequence to write
ns - the namespace to write it with
Throws:
IOException - in case it couldn't write something

getDefaultFormat

public String getDefaultFormat()
getDefaultFormat returns the String identifier for the default sub-format written by a SequenceFormat implementation.

Returns:
a String.