org.apache.nutch.metadata
Class SpellCheckedMetadata

java.lang.Object
  org.apache.nutch.metadata.Metadata
      org.apache.nutch.metadata.SpellCheckedMetadata

All Implemented Interfaces:

org.apache.hadoop.io.Writable, CreativeCommons, DublinCore, Feed, HttpHeaders, Nutch

public class SpellCheckedMetadata
extends Metadata

A decorator to Metadata that adds spellchecking capabilities to property names. Currently used spelling vocabulary contains just the httpheaders from HttpHeaders class.

Field Summary

Fields inherited from interface org.apache.nutch.metadata.CreativeCommons

LICENSE_LOCATION, LICENSE_URL, WORK_TYPE

Fields inherited from interface org.apache.nutch.metadata.DublinCore

CONTRIBUTOR, COVERAGE, CREATOR, DATE, DESCRIPTION, FORMAT, IDENTIFIER, LANGUAGE, MODIFIED, PUBLISHER, RELATION, RIGHTS, SOURCE, SUBJECT, TITLE, TYPE

Fields inherited from interface org.apache.nutch.metadata.HttpHeaders

CONTENT_DISPOSITION, CONTENT_ENCODING, CONTENT_LANGUAGE, CONTENT_LENGTH, CONTENT_LOCATION, CONTENT_MD5, CONTENT_TYPE, LAST_MODIFIED, LOCATION

Fields inherited from interface org.apache.nutch.metadata.Nutch

ALL_BATCH_ID_STR, ALL_CRAWL_ID, ARG_BATCH, ARG_CLASS, ARG_CRAWL, ARG_CURTIME, ARG_DEPTH, ARG_FILTER, ARG_FORCE, ARG_NORMALIZE, ARG_NUMTASKS, ARG_RESUME, ARG_SEEDDIR, ARG_SEEDLIST, ARG_SOLR, ARG_SORT, ARG_THREADS, ARG_TOPN, BATCH_NAME_KEY, CACHING_FORBIDDEN_ALL, CACHING_FORBIDDEN_CONTENT, CACHING_FORBIDDEN_KEY, CACHING_FORBIDDEN_KEY_UTF8, CACHING_FORBIDDEN_NONE, CHAR_ENCODING_FOR_CONVERSION, CRAWL_ID_KEY, FETCH_STATUS_KEY, FETCH_TIME_KEY, GENERATE_TIME_KEY, ORIGINAL_CHAR_ENCODING, PROTO_STATUS_KEY, REPR_URL_KEY, SCORE_KEY, SIGNATURE_KEY, STAT_COUNTERS, STAT_JOBS, STAT_MESSAGE, STAT_PHASE, STAT_PROGRESS, WRITABLE_GENERATE_TIME_KEY, WRITABLE_PROTO_STATUS_KEY, WRITABLE_REPR_URL_KEY

Fields inherited from interface org.apache.nutch.metadata.Feed

FEED, FEED_AUTHOR, FEED_PUBLISHED, FEED_TAGS, FEED_UPDATED

Constructor Summary

SpellCheckedMetadata()

Method Summary

void	add(String name, String value) Add a metadata name/value mapping.
String	get(String name) Get the value associated to a metadata name.
static String	getNormalizedName(String name) Get the normalized name of metadata attribute name.
String[]	getValues(String name) Get the values associated to a metadata name.
void	remove(String name) Remove a metadata and all its associated values.
void	set(String name, String value) Set metadata name/value.

Methods inherited from class org.apache.nutch.metadata.Metadata

clear, equals, isMultiValued, names, readFields, setAll, size, toString, write

Methods inherited from class java.lang.Object

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

Constructor Detail

SpellCheckedMetadata

public SpellCheckedMetadata()

Method Detail

getNormalizedName

public static String getNormalizedName(String name)

Get the normalized name of metadata attribute name. This method tries to find a well-known metadata name (one of the metadata names defined in this class) that matches the specified name. The matching is error tolerent. For instance,

• content-type gives Content-Type
• CoNtEntType gives Content-Type
• ConTnTtYpe gives Content-Type

If no matching with a well-known metadata name is found, then the original name is returned.

Parameters:

name - Name to normalize

Returns:

normalized name

remove

public void remove(String name)

Description copied from class: Metadata

Remove a metadata and all its associated values.

Overrides:

remove in class Metadata

Parameters:

name - metadata name to remove

add

public void add(String name,
                String value)

Description copied from class: Metadata

Add a metadata name/value mapping. Add the specified value to the list of values associated to the specified metadata name.

Overrides:

add in class Metadata

Parameters:

name - the metadata name.

value - the metadata value.

getValues

public String[] getValues(String name)

Description copied from class: Metadata

Get the values associated to a metadata name.

Overrides:

getValues in class Metadata

Parameters:

name - of the metadata.

Returns:

the values associated to a metadata name.

get

public String get(String name)

Description copied from class: Metadata

Get the value associated to a metadata name. If many values are assiociated to the specified name, then the first one is returned.

Overrides:

get in class Metadata

Parameters:

name - of the metadata.

Returns:

the value associated to the specified metadata name.

set

public void set(String name,
                String value)

Description copied from class: Metadata

Set metadata name/value. Associate the specified value to the specified metadata name. If some previous values were associated to this name, they are removed.

Overrides:

set in class Metadata

Parameters:

name - the metadata name.

value - the metadata value.