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## org.biojava.bio.program.tagvalue
Class Indexer

    java.lang.Object
      org.biojava.bio.program.tagvalue.Indexer

All Implemented Interfaces:
  TagValueListener

    public class Indexer

extends Object
implements TagValueListener

Listens to tag-value events and passes on indexing events to an IndexStore.

This class is provided to allow the indexing of arbitrary record-based text files. Indexer objects are built for a single file and the indexes are written to a single index store. To keep all of the reader offsets in sync with one another, you will almost certainly wish to use the getReader() method to retrieve a CountedBufferedReader instance if you want to read the byte-offset between calls to Parser.read(). Below is an example of how to index a file.

Note: It is very important to configure the BioStoreFactory instance with all the right keys before hand.

     File fileToIndex; // get this from somewhere
     BioStore store = bsf.createBioStore();
     Indexer indexer = new Indexer(fileToIndex, store);
     indexer.setPrimaryKeyName("foo");
     indexer.addSecondaryKey("bar");
     indexer.addSecondaryKey("baz");

     TagValueParser tvParser; // make this appropriate for your format
     TagValueListener listener; // make this appropriate for your format
                                // and forward all events to changer

     Parser parser = new Parser();
     while(
       parser.read(indexer.getReader(), tvParser, listener)
     ) {
       System.out.print(".");
     }

Since:
  1.2
Author:
  Matthew Pocock

Constructor Summary
`Indexer(File file, IndexStore indexStore)` Build a new Indexer.

Method Summary
`void` | `addSecondaryKey(String secKeyName)` Add a secondary key.
`void` | `endRecord()` The current record has ended.
`void` | `endTag()` End the current tag.
`String` | `getPrimaryKeyName()` Retrieve the tag currently used as primary key.
`CountedBufferedReader` | `getReader()` Retrieve the reader that can be safely used to index this file.
`void` | `removeSecondaryKey(String secKeyName)` Remove a secondary key.
`void` | `setPrimaryKeyName(String primaryKeyName)` Set the tag to use as a primary key in the index.
`void` | `startRecord()` A new record is about to start.
`void` | `startTag(Object tag)` Start a new tag.
`void` | `value(TagValueContext ctxt, Object value)` A value has been seen.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### Indexer

    public Indexer(File file,
                   IndexStore indexStore)
            throws FileNotFoundException

  Build a new Indexer.

  Parameters:
    `file` - the file to be processed
    `indexStore` - the IndexStore to write to
  Throws:
    `FileNotFoundException`

Method Detail

### getReader

    public CountedBufferedReader getReader()

  Retrieve the reader that can be safely used to index this file.

  Returns:
    the CountedBufferedReader that should be processed

### setPrimaryKeyName

    public void setPrimaryKeyName(String primaryKeyName)

  Set the tag to use as a primary key in the index.

  Whenever a value for the primary key tag is seen, this is passed to the indexer as the primary key for indexing.

  Primary keys must be unique between entries, and each entry must provide exactly one primary key value.

  Parameters:
    `primaryKeyName` - the tag to use as primary key

### getPrimaryKeyName

    public String getPrimaryKeyName()

  Retrieve the tag currently used as primary key.

  Returns:
    a String representing the primary key name

### addSecondaryKey

    public void addSecondaryKey(String secKeyName)

  Add a secondary key.

  Secondary keys are potentially non-unique properties of the entries being indexed. Multiple records can use the same secondary key values, and a single record can have multiple values for a secondary key.

  Parameters:
    `secKeyName` - the name of the secondary key to add

### removeSecondaryKey

    public void removeSecondaryKey(String secKeyName)

  Remove a secondary key.

  Parameters:
    `secKeyName` - the name of the secondary key to remove

### startRecord

    public void startRecord()

  Description copied from interface: `TagValueListener`
  A new record is about to start.

  Specified by:
    `startRecord` in interface `TagValueListener`

### startTag

    public void startTag(Object tag)

  Description copied from interface: `TagValueListener`
  Start a new tag.

  Specified by:
    `startTag` in interface `TagValueListener`
  Parameters:
    `tag` - the Object representing the new tag

### value

    public void value(TagValueContext ctxt,
                      Object value)

  Description copied from interface: `TagValueListener`
  A value has been seen.

  Specified by:
    `value` in interface `TagValueListener`
  Parameters:
    `ctxt` - a TagValueContext that could be used to push a sub-document
    `value` - the value Object observed

### endTag

    public void endTag()

  Description copied from interface: `TagValueListener`
  End the current tag.

  Specified by:
    `endTag` in interface `TagValueListener`

### endRecord

    public void endRecord()
                   throws ParserException

  Description copied from interface: `TagValueListener`
  The current record has ended.

  Specified by:
    `endRecord` in interface `TagValueListener`
  Throws:
    `ParserException` - if the record can not be ended

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