info.ephyra.search.searchers
Class YahooKM

java.lang.Object
  java.lang.Thread
      info.ephyra.search.searchers.Searcher
          info.ephyra.search.searchers.KnowledgeMiner
              info.ephyra.search.searchers.YahooKM

All Implemented Interfaces:

java.lang.Runnable

public class YahooKM
extends KnowledgeMiner

A KnowledgeMiner that deploys the Yahoo search engine to search the World Wide Web.

It runs as a separate thread, so several queries can be performed in parallel.

This class extends the class KnowledgeMiner.

Version:

2007-05-29

Author:

Nico Schlaefer

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Thread

java.lang.Thread.State, java.lang.Thread.UncaughtExceptionHandler

Field Summary

private static int	MAX_RESULTS_PERQUERY Maximum number of search results per query.
private static int	MAX_RESULTS_TOTAL Maximum total number of search results.
private static int	RETRIES Number of retries if search fails.
private static java.lang.String	YAHOO_ID Yahoo application ID, allows 5,000 queries per day and IP address.

Fields inherited from class info.ephyra.search.searchers.KnowledgeMiner

firstResult, maxResults

Fields inherited from class info.ephyra.search.searchers.Searcher

query, results

Fields inherited from class java.lang.Thread

MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Constructor Summary

YahooKM()

Method Summary

protected Result[]	doSearch() Queries the Yahoo search engine and returns an array containing up to MAX_RESULTS_PERQUERY search results.
KnowledgeMiner	getCopy() Returns a new instance of YahooKM.
protected int	getMaxResultsPerQuery() Returns the maximum number of search results per query.
protected int	getMaxResultsTotal() Returns the maximum total number of search results.
static java.lang.String	transformQueryString(java.lang.String qs) Returns a representation of the query string that is suitable for Yahoo.

Methods inherited from class info.ephyra.search.searchers.KnowledgeMiner

getResults, getResults, start, start

Methods inherited from class info.ephyra.search.searchers.Searcher

run

Methods inherited from class java.lang.Thread

activeCount, checkAccess, countStackFrames, currentThread, destroy, dumpStack, enumerate, getAllStackTraces, getContextClassLoader, getDefaultUncaughtExceptionHandler, getId, getName, getPriority, getStackTrace, getState, getThreadGroup, getUncaughtExceptionHandler, holdsLock, interrupt, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, resume, setContextClassLoader, setDaemon, setDefaultUncaughtExceptionHandler, setName, setPriority, setUncaughtExceptionHandler, sleep, sleep, start, stop, stop, suspend, toString, yield

Methods inherited from class java.lang.Object

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

Field Detail

YAHOO_ID

private static final java.lang.String YAHOO_ID

Yahoo application ID, allows 5,000 queries per day and IP address.

See Also:

Constant Field Values

MAX_RESULTS_TOTAL

private static final int MAX_RESULTS_TOTAL

Maximum total number of search results.

See Also:

Constant Field Values

MAX_RESULTS_PERQUERY

private static final int MAX_RESULTS_PERQUERY

Maximum number of search results per query.

See Also:

Constant Field Values

RETRIES

private static final int RETRIES

Number of retries if search fails.

See Also:

Constant Field Values

Constructor Detail

YahooKM

public YahooKM()

Method Detail

transformQueryString

public static java.lang.String transformQueryString(java.lang.String qs)

Returns a representation of the query string that is suitable for Yahoo.

Parameters:

qs - query string

Returns:

query string for Yahoo

getMaxResultsTotal

protected int getMaxResultsTotal()

Returns the maximum total number of search results.

Specified by:

getMaxResultsTotal in class KnowledgeMiner

Returns:

maximum total number of search results

getMaxResultsPerQuery

protected int getMaxResultsPerQuery()

Returns the maximum number of search results per query.

Specified by:

getMaxResultsPerQuery in class KnowledgeMiner

Returns:

maximum total number of search results

doSearch

protected Result[] doSearch()

Queries the Yahoo search engine and returns an array containing up to MAX_RESULTS_PERQUERY search results.

Specified by:

doSearch in class Searcher

Returns:

Yahoo search results

getCopy

public KnowledgeMiner getCopy()

Returns a new instance of YahooKM. A new instance is created for each query.

Specified by:

getCopy in class KnowledgeMiner

Returns:

new instance of YahooKM