org.carrot2.source.google

Class GoogleDocumentSource

java.lang.Object

org.carrot2.core.ProcessingComponentBase

org.carrot2.source.SearchEngineBase

org.carrot2.source.MultipageSearchEngine

org.carrot2.source.google.GoogleDocumentSource

All Implemented Interfaces:

IDocumentSource, IProcessingComponent

@Bindable(prefix="GoogleDocumentSource")
public class GoogleDocumentSource
extends MultipageSearchEngine

A IDocumentSource fetching search results from Google JSON API. Please note that this document source cannot deliver more than 32 search results.

See Also:

Google AJAX API

Nested Class Summary

Nested classes/interfaces inherited from class org.carrot2.source.MultipageSearchEngine

MultipageSearchEngine.SearchEngineResponseCallable, MultipageSearchEngine.SearchMode, MultipageSearchEngine.SearchRange

Field Summary

Fields

Modifier and Type	Field and Description
boolean	keepHighlights Keep query word highlighting.
HttpRedirectStrategy	redirectStrategy HTTP redirect response strategy (follow or throw an error).
String	referer Request referrer.
String	serviceUrl Service URL.

Fields inherited from class org.carrot2.source.MultipageSearchEngine

searchMode

Fields inherited from class org.carrot2.source.SearchEngineBase

compressed, documents, POSTPROCESSING, query, results, resultsTotal, SERVICE, start, statistics

Constructor Summary

Constructors

Constructor and Description
GoogleDocumentSource()

Method Summary

Methods

Modifier and Type	Method and Description
protected void	afterFetch(SearchEngineResponse response) Called after a single search engine response has been fetched.
protected Callable<SearchEngineResponse>	createFetcher(MultipageSearchEngine.SearchRange bucket) Subclasses should override this method and return a Callable instance that fetches search results in the given range.
void	process() Performs the processing required to fulfill the request.

Methods inherited from class org.carrot2.source.MultipageSearchEngine

collectDocuments, process, runQuery

Methods inherited from class org.carrot2.source.SearchEngineBase

clean, urlEncode

Methods inherited from class org.carrot2.core.ProcessingComponentBase

afterProcessing, beforeProcessing, dispose, getContext, getSharedExecutor, init

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.carrot2.core.IProcessingComponent

afterProcessing, beforeProcessing, dispose, init

Field Detail

serviceUrl

@Input
@Processing
@Internal
@Attribute
@Label(value="Service URL")
@Level(value=ADVANCED)
@Group(value="Service")
public String serviceUrl

Service URL. Google web search service URL.

referer

@Input
@Processing
@Internal
@Attribute
@Label(value="Referrer")
@Level(value=ADVANCED)
@Group(value="Service")
public String referer

Request referrer. Please do not use the default value when deploying this component in production environments. Instead, put the URL to your application here.

keepHighlights

@Input
@Processing
@Attribute
@Label(value="Keep highlights")
@Level(value=ADVANCED)
@Group(value="Postprocessing")
public boolean keepHighlights

Keep query word highlighting. Google by default highlights query words in snippets using the bold HTML tag. Set this attribute to true to keep these highlights.

redirectStrategy

@Input
@Processing
@Attribute
@Label(value="HTTP redirect strategy")
@Level(value=MEDIUM)
@Group(value="Service")
@Internal
public HttpRedirectStrategy redirectStrategy

HTTP redirect response strategy (follow or throw an error).

Constructor Detail

GoogleDocumentSource

public GoogleDocumentSource()

Method Detail

process

public void process()
             throws ProcessingException

Description copied from interface: IProcessingComponent

Performs the processing required to fulfill the request. This method is called once per request.

Specified by:

process in interface IProcessingComponent

Overrides:

process in class ProcessingComponentBase

Throws:

ProcessingException - when processing failed. If thrown, the IProcessingComponent.afterProcessing() method will be called and the component will be ready to accept further requests or to be disposed of. Finally, the exception will be rethrown from the controller method that caused the component to perform processing.

createFetcher

protected Callable<SearchEngineResponse> createFetcher(MultipageSearchEngine.SearchRange bucket)

Description copied from class: MultipageSearchEngine

Subclasses should override this method and return a Callable instance that fetches search results in the given range.

Note the query (if any is required) should be passed at the concrete class level. We are not concerned with it here.

Specified by:

createFetcher in class MultipageSearchEngine

Parameters:

bucket - The search range to fetch.

afterFetch

protected void afterFetch(SearchEngineResponse response)

Description copied from class: SearchEngineBase

Called after a single search engine response has been fetched. The concrete implementation may want to override this empty implementation to e.g., clean or otherwise postprocess the returned results.

Overrides:

afterFetch in class SearchEngineBase