org.cdlib.xtf.textEngine.facet
Class FRBRData

Object
  FRBRData

public class FRBRData
extends Object

Keeps a large in-memory table of the title, author, and other info for each document.

Author:

Martin Haye

Field Summary

private static WeakHashMap	cache Cached data.
IntMultiMap	docTags
static int	FIRST_TYPE
static int	LAST_TYPE
IntMultiMap	tagDocs
TagArray	tags
static int	TYPE_AUTHOR
static int	TYPE_DATE
static int	TYPE_ID
static int	TYPE_TITLE

Constructor Summary

private

FRBRData(IndexReader reader, String[] fields) Read tags for a given set of fields from the given reader.

Method Summary

private int	addTag(String term, int type) Add a tag for the given term and type.
private int	calcType(String field) Calculate the type of a given field, based on the field name.
static FRBRData	getCachedTags(IndexReader reader, String[] fields) Retrieves tags for a given set of fields from a given reader.
private int	readField(IndexReader reader, String field, int type) Read all the term->document mappings from a given field, and add them to the tag array, and docTags mapping.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

cache

private static WeakHashMap cache

Cached data. If the reader goes away, our cache will too.

FIRST_TYPE

public static final int FIRST_TYPE

See Also:

Constant Field Values

TYPE_TITLE

public static final int TYPE_TITLE

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Constant Field Values

TYPE_AUTHOR

public static final int TYPE_AUTHOR

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Constant Field Values

TYPE_DATE

public static final int TYPE_DATE

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Constant Field Values

TYPE_ID

public static final int TYPE_ID

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Constant Field Values

LAST_TYPE

public static final int LAST_TYPE

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Constant Field Values

tags

public final TagArray tags

docTags

public final IntMultiMap docTags

tagDocs

public final IntMultiMap tagDocs

Constructor Detail

FRBRData

private FRBRData(IndexReader reader,
                 String[] fields)
          throws IOException

Read tags for a given set of fields from the given reader. Do not construct directly, but rather use getCachedTags(IndexReader, String[]).

Throws:

IOException

Method Detail

getCachedTags

public static FRBRData getCachedTags(IndexReader reader,
                                     String[] fields)
                              throws IOException

Retrieves tags for a given set of fields from a given reader. Maintains a cache so that if the same fields are requested again for this reader, we don't have to re-read the tags.

Parameters:

reader - Where to read the tags from

fields - Which fields to read

Returns:

FRBR tags for the specified fields

Throws:

IOException

readField

private int readField(IndexReader reader,
                      String field,
                      int type)
               throws IOException

Read all the term->document mappings from a given field, and add them to the tag array, and docTags mapping.

Returns:

number of tags added

Throws:

IOException

addTag

private int addTag(String term,
                   int type)

Add a tag for the given term and type.

Parameters:

term - Term to parse and add

type - Type to add the tag under

calcType

private int calcType(String field)
              throws IOException

Calculate the type of a given field, based on the field name.

Throws:

IOException