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## org.biojava.bio.seq.db
Class EmblCDROMIndexStore

    java.lang.Object
      org.biojava.bio.seq.db.EmblCDROMIndexStore

All Implemented Interfaces:
  IndexStore

    public class EmblCDROMIndexStore

extends Object
implements IndexStore

`EmblCDROMIndexStore`s implement a read-only `IndexStore` backed by EMBL CD-ROM format binary indices. The required index files are typically named "division.lkp" and "entrynam.idx". As an `IndexStore` performs lookups by sequence ID, the index files "acnum.trg" and "acnum.hit" (which store additional accession number data) are not used.

The sequence IDs are found using a binary search via a pointer into the index file. The whole file is not read unless a request for all the IDs is made using the getIDs() method. The set of IDs is then cached after the first pass. This class also has a `close()` method to free resources associated with the underlying `RandomAccessFile`.

The binary index files may be created using the EMBOSS programs dbifasta, dbiblast, dbiflat or dbigcg. The least useful from the BioJava perspective is dbigcg because we do not have a `SequenceFormat` implementation for GCG format files.

The `Index` instances returned by this class do not have the record length set because this information is not available in the binary index. The value -1 is used instead, as described in the `Index` interface.

Since:
  1.2
Author:
  Keith James

Constructor Summary
`EmblCDROMIndexStore(File pathPrefix, File divisionLkp, File entryNamIdx, SequenceFormat format, SequenceBuilderFactory factory, SymbolTokenization parser)` Creates a new `EmblCDROMIndexStore` backed by a random access binary index.
`EmblCDROMIndexStore(File divisionLkp, File entryNamIdx, SequenceFormat format, SequenceBuilderFactory factory, SymbolTokenization parser)` Creates a new `EmblCDROMIndexStore` backed by a random access binary index.

Method Summary
`void` | `close()` `close` closes the underlying `EntryNamRandomAccess` which in turn closes the lower level `RandomAccessFile`.
`void` | `commit()` `commit` commits changes.
`Index` | `fetch(String id)` Fetch an Index based upon an ID.
`Set` | `getFiles()` Retrieve the Set of files that are currently indexed.
`SequenceFormat` | `getFormat()` Retrieve the format of the index file.
`Set` | `getIDs()` Retrieve the set of all current IDs.
`String` | `getName()` `getName` returns the database name as defined within the EMBL CD-ROM index.
`File` | `getPathPrefix()` `getPathPrefix` returns the abstract path currently being appended to the raw sequence database filenames extracted from the binary index.
`SequenceBuilderFactory` | `getSBFactory()` Retrieve the SequenceBuilderFactory used to build Sequence instances.
`SymbolTokenization` | `getSymbolParser()` Retrieve the symbol parser used to turn the sequence characters into Symobl objects.
`void` | `rollback()` `rollback` rolls back changes made since the last `commit`.
`void` | `setPathPrefix(File pathPrefix)` `setPathPrefix` sets the abstract path to be appended to sequence database filenames retrieved from the binary index.
`void` | `store(Index index)` `store` adds an `Index` to the store.

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

Constructor Detail

### EmblCDROMIndexStore

    public EmblCDROMIndexStore(File divisionLkp,
                               File entryNamIdx,
                               SequenceFormat format,
                               SequenceBuilderFactory factory,
                               SymbolTokenization parser)
                        throws IOException

  Creates a new `EmblCDROMIndexStore` backed by a random access binary index.

  Parameters:
    `divisionLkp` - a `File` containing the master index.
    `entryNamIdx` - a `File` containing the sequence IDs and offsets.
    `format` - a `SequenceFormat`.
    `factory` - a `SequenceBuilderFactory`.
    `parser` - a `SymbolTokenization`.
  Throws:
    `IOException` - if an error occurs.

### EmblCDROMIndexStore

    public EmblCDROMIndexStore(File pathPrefix,
                               File divisionLkp,
                               File entryNamIdx,
                               SequenceFormat format,
                               SequenceBuilderFactory factory,
                               SymbolTokenization parser)
                        throws IOException

  Creates a new `EmblCDROMIndexStore` backed by a random access binary index.

  Parameters:
    `pathPrefix` - a `File` containing the abstract path to be appended to sequence database filenames retrieved from the binary index.
    `divisionLkp` - a `File` containing the master index.
    `entryNamIdx` - a `File` containing the sequence IDs and offsets.
    `format` - a `SequenceFormat`.
    `factory` - a `SequenceBuilderFactory`.
    `parser` - a `SymbolTokenization`.
  Throws:
    `IOException` - if an error occurs.

Method Detail

### getPathPrefix

    public File getPathPrefix()

  `getPathPrefix` returns the abstract path currently being appended to the raw sequence database filenames extracted from the binary index. This value defaults to the empty abstract path.

  Returns:
    a `File`.

### setPathPrefix

    public void setPathPrefix(File pathPrefix)

  `setPathPrefix` sets the abstract path to be appended to sequence database filenames retrieved from the binary index. E.g. if the binary index refers to the database as 'SWALL' and the `pathPrefix` is set to "/usr/local/share/data/seq/", then the `IndexStore` will know the database path as "/usr/local/share/data/seq/swall" and any `Index` instances produced by the store will return the latter path when their getFile() method is called. This value defaults to the empty abstract path.

  Parameters:
    `pathPrefix` - a `File` prefix specifying the abstract path to append.

### getName

    public String getName()

  `getName` returns the database name as defined within the EMBL CD-ROM index.

  Specified by:
    `getName` in interface `IndexStore`
  Returns:
    a `String` value.

### store

    public void store(Index index)
               throws IllegalIDException,
                      BioException

  `store` adds an `Index` to the store. As EMBL CD-ROM indices are read-only, this implementation throws a `BioException`.

  Specified by:
    `store` in interface `IndexStore`
  Parameters:
    `index` - an `Index`.
  Throws:
    `IllegalIDException` - if an error occurs.
    `BioException` - if an error occurs.

### commit

    public void commit()
                throws BioException

  `commit` commits changes. As EMBL CD-ROM indices are read-only, this implementation throws a `BioException`.

  Specified by:
    `commit` in interface `IndexStore`
  Throws:
    `BioException` - if an error occurs.

### rollback

    public void rollback()

  `rollback` rolls back changes made since the last `commit`. As EMBL CD-ROM indices are read-only, this implementation does nothing.

  Specified by:
    `rollback` in interface `IndexStore`

### fetch

    public Index fetch(String id)
                throws IllegalIDException,
                       BioException

  Description copied from interface: `IndexStore`
  Fetch an Index based upon an ID.

  Specified by:
    `fetch` in interface `IndexStore`
  Parameters:
    `id` - The ID of the sequence Index to retrieve
  Throws:
    `IllegalIDException` - if the ID couldn't be found
    `BioException` - if the fetch fails in the underlying storage mechanism

### getIDs

    public Set getIDs()

  Description copied from interface: `IndexStore`
  Retrieve the set of all current IDs.

  This set should either be immutable, or modifiable totally separately from the IndexStore.

  Specified by:
    `getIDs` in interface `IndexStore`
  Returns:
    a Set of all legal IDs

### getFiles

    public Set getFiles()

  Description copied from interface: `IndexStore`
  Retrieve the Set of files that are currently indexed.

  Specified by:
    `getFiles` in interface `IndexStore`

### getFormat

    public SequenceFormat getFormat()

  Description copied from interface: `IndexStore`
  Retrieve the format of the index file.

  This set should either be immutable, or modifiable totally separately from the IndexStore.

  Specified by:
    `getFormat` in interface `IndexStore`
  Returns:
    a Set of all indexed files

### getSBFactory

    public SequenceBuilderFactory getSBFactory()

  Description copied from interface: `IndexStore`
  Retrieve the SequenceBuilderFactory used to build Sequence instances.

  Specified by:
    `getSBFactory` in interface `IndexStore`
  Returns:
    the associated SequenceBuilderFactory

### getSymbolParser

    public SymbolTokenization getSymbolParser()

  Description copied from interface: `IndexStore`
  Retrieve the symbol parser used to turn the sequence characters into Symobl objects.

  Specified by:
    `getSymbolParser` in interface `IndexStore`
  Returns:
    the associated SymbolParser

### close

    public void close()
               throws IOException

  `close` closes the underlying `EntryNamRandomAccess` which in turn closes the lower level `RandomAccessFile`. This frees the resources associated with the file.

  Throws:
    `IOException` - if an error occurs.

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