Package org.biojava.bio.program.sax

Class BlastLikeSAXParser

java.lang.Object
org.biojava.bio.program.sax.BlastLikeSAXParser
All Implemented Interfaces:
XMLReader
public class BlastLikeSAXParser extends Object
A facade class allowing for direct SAX2-like parsing of the native output from Blast-like bioinformatics software. Because the parser is SAX2 compliant, application writers can simply pass XML ContentHandlers to the parser in order to receive notifcation of SAX2 events.

The SAX2 events produced are as if the input to the parser was an XML file validating against the biojava BlastLikeDataSetCollection DTD. There is no requirement for an intermediate conversion of native output to XML format. An application of the parsing framework, however, is to create XML format files from native output files.

The biojava Blast-like parsing framework is designed to uses minimal memory,so that in principle, extremely large native outputs can be parsed and XML ContentHandlers can listen only for small amounts of information.

The framework currently supports parsing of native output from the following bioinformatics programs. Please note that if you are using different versions of NCBI or WU Blast to those listed below, it is worth considering trying setting the parsing mode to Lazy, which means parsing will be attempted if the program is recognised, regardless of version.

  • NCBI Blast version 2.0.11
  • NCBI Blast version 2.2.2
  • NCBI Blast version 2.2.3
  • WU-Blast version 2.0a19mp-washu
  • HMMER 2.1.1 hmmsearch
Planned addition support
  • Support for HMMER hmmpfam almost there but not fully tested

Notes to SAX driver writers

The framework that this parser is built on is designed to be extensible with support for both different pieces of software (i.e. not just software that produces Blast-like output), and multiple versions of programs.

This class inherits from the org.biojava.bio.program.sax.AbstractNativeAppSAXParser abstract base class. The abstract base class is a good place to start looking if you want to write new native application SAX2 parsers. This and releated classes have only package-level visibility. Typically, application writers are expected to provide a facade class in this package (similar to the current class) to allow users access to functionality.

NB Support for InputSource is not complete due to the fact that URLs are not resolved and cannot, therefore, be used as an InputSource. System pathnames, ByteStreams and CharacterStreams, however, are all supported.

Copyright © 2000 Cambridge Antibody Technology.

Primary author -

  • Simon Brocklehurst (CAT)
Other authors -
  • Tim Dilks (CAT)
  • Colin Hardman (CAT)
  • Stuart Johnston (CAT)
  • Mathieu Wiepert (Mayo Foundation)
  • Travis Banks
Version:
1.0
Author:
Cambridge Antibody Technology (CAT), Travis Banks
See Also:

  • Field Details

    • oHandler

      protected ContentHandler oHandler

    • tNamespaces

      protected boolean tNamespaces

    • tNamespacePrefixes

      protected boolean tNamespacePrefixes

    • oNamespacePrefix

      protected String oNamespacePrefix

    • oFullNamespacePrefix

      protected String oFullNamespacePrefix

    • iState

      protected int iState

  • Constructor Details

    • BlastLikeSAXParser

      public BlastLikeSAXParser()
      Initialises SAXParser, and sets default namespace prefix to "biojava".

  • Method Details

    • parse

      public void parse(InputSource poSource) throws IOException, SAXException
      parse initiates the parsing operation.
      Specified by:
      parse in interface XMLReader
      Parameters:
      poSource - an InputSource.
      Throws:
      IOException - if an error occurs.
      SAXException - if an error occurs.

    • setModeStrict

      public void setModeStrict()
      This is the default, parsing will be attempted only if both the program e.g. NCBI BlastP, and a particular version are recognised as bsing supported.

    • setModeLazy

      public void setModeLazy()
      Setting the mode to lazy means that, if the program is recognised, e.g. WU-TBlastX, then parsing will be attempted even if the particular version is not recognised. Using this option is more likely to result in erroneous parsing than if the strict mode is used.

    • setContentHandler

      public void setContentHandler(ContentHandler poHandler)
      Allow an application to register a content event handler. If the application does not register a content handler, all content events reported by the SAX parser will be silently ignored.

      Applications may register a new or different handler in the middle of a parse, and the SAX parser must begin using the new handler immediately.

      Specified by:
      setContentHandler in interface XMLReader
      Parameters:
      poHandler - a ContentHandler The XML content handler
      Throws:
      NullPointerException - If the handler argument is null

    • getContentHandler

      public ContentHandler getContentHandler()
      Return the content handler.
      Specified by:
      getContentHandler in interface XMLReader
      Returns:
      a ContentHandler The current content handler, or null if none has been registered.

    • parse

      public void parse(String poSystemId) throws IOException, SAXException
      Full implementation of interface method.
      Specified by:
      parse in interface XMLReader
      Throws:
      IOException
      SAXException

    • getFeature

      public boolean getFeature(String poName) throws SAXNotRecognizedException, SAXNotSupportedException
      Do-nothing implementation of interface method
      Specified by:
      getFeature in interface XMLReader
      Throws:
      SAXNotRecognizedException
      SAXNotSupportedException

    • setFeature

      public void setFeature(String poName, boolean value) throws SAXNotRecognizedException, SAXNotSupportedException
      Handles support for ReasoningDomain and Namespace-prefixes
      Specified by:
      setFeature in interface XMLReader
      Throws:
      SAXNotRecognizedException
      SAXNotSupportedException

    • getProperty

      public Object getProperty(String name) throws SAXNotRecognizedException, SAXNotSupportedException
      Do-nothing implementation of interface method
      Specified by:
      getProperty in interface XMLReader
      Throws:
      SAXNotRecognizedException
      SAXNotSupportedException

    • setProperty

      public void setProperty(String name, Object value) throws SAXNotRecognizedException, SAXNotSupportedException
      Do-nothing implementation of interface method
      Specified by:
      setProperty in interface XMLReader
      Throws:
      SAXNotRecognizedException
      SAXNotSupportedException

    • setEntityResolver

      public void setEntityResolver(EntityResolver resolver)
      Do-nothing implementation of interface method
      Specified by:
      setEntityResolver in interface XMLReader

    • getEntityResolver

      public EntityResolver getEntityResolver()
      Do-nothing implementation of interface method
      Specified by:
      getEntityResolver in interface XMLReader

    • setDTDHandler

      public void setDTDHandler(DTDHandler handler)
      Do-nothing implementation of interface method
      Specified by:
      setDTDHandler in interface XMLReader

    • getDTDHandler

      public DTDHandler getDTDHandler()
      Do-nothing implementation of interface method
      Specified by:
      getDTDHandler in interface XMLReader

    • setErrorHandler

      public void setErrorHandler(ErrorHandler handler)
      Do-nothing implementation of interface method
      Specified by:
      setErrorHandler in interface XMLReader

    • getErrorHandler

      public ErrorHandler getErrorHandler()
      Do-nothing implementation of interface method
      Specified by:
      getErrorHandler in interface XMLReader

    • startElement

      protected void startElement(org.biojava.bio.program.sax.QName poQName, Attributes atts) throws SAXException
      Utility method to centralize sending of a SAX startElement message to document handler
      Parameters:
      poQName - a QName value
      atts - an Attributes value
      Throws:
      SAXException - if an error occurs

    • endElement

      protected void endElement(org.biojava.bio.program.sax.QName poQName) throws SAXException
      Utility method to centralize the sending of a SAX endElement message a document handler.
      Parameters:
      poQName - -
      Throws:
      SAXException - thrown if
      thrown - if

    • characters

      protected void characters(char[] ch, int start, int length) throws SAXException
      Utility method to centralize the sending of a SAX characters message a document handler.
      Parameters:
      ch - -
      start - -
      length - -
      Throws:
      SAXException - thrown if
      thrown - if

    • getNamespaces

      public boolean getNamespaces()
      Support SAX2 configuration of namespace support of parser.

    • getNamespacePrefixes

      public boolean getNamespacePrefixes()
      Support SAX2 configuration of namespace support of parser.

    • addPrefixMapping

      public void addPrefixMapping(String poPrefix, String poURI)
      Adds a namespace prefix to URI mapping as (key,value) pairs. This mapping can be looked up later to get URIs on request using the getURIFromPrefix method.
      Parameters:
      poPrefix - a String representation of the namespace prefix
      poURI - a String representation of the URI for the namespace prefix.

    • getURIFromPrefix

      public String getURIFromPrefix(String poPrefix)
      Gets the URI for a namespace prefix, given that prefix, or null if the prefix is not recognised.
      Parameters:
      poPrefix - a String The namespace prefix.

    • setNamespacePrefix

      public void setNamespacePrefix(String poPrefix)
      Parameters:
      poPrefix - a String value

    • getNamespacePrefix

      public String getNamespacePrefix()
      Describe getNamespacePrefix method here.
      Returns:
      a String value

    • prefix

      public String prefix(String poElementName)
      Given an unprefixed element name, returns a new element name with a namespace prefix
      Returns:
      a String value

    • getContentStream

      protected BufferedReader getContentStream(InputSource poSource)
      Create a stream from an an InputSource, picking the correct stream according to order of precedance.
      Parameters:
      poSource - an InputSource value
      Returns:
      a BufferedReader value

    • changeState

      protected void changeState(int piState)
      Centralise chaining of iState field to help with debugging. E.g. printing out value etc. All changes to iState should be made through this method.
      Parameters:
      piState - an int value