info.textgrid.lab.search

Class LazySearchResultProvider

java.lang.Object

info.textgrid.lab.search.LazySearchResultProvider

All Implemented Interfaces:

IContentProvider, ILazyTreeContentProvider

public class LazySearchResultProvider
extends Object
implements ILazyTreeContentProvider

A lazy content provider for search results. The idea is as follows: When the input is set or the item count of the root element needs to be refreshed, we start an initial query with a cutoff at, say, 100 results. When we have a search result, we set the item's child count to the number of hits. Afterwards, we start adding result items (see below for what that means). When the TreeViewer wants an element to be updated, we're looking for whether that element is already in our result cache. If it is, we simply call TreeViewer.replace(Object, int, Object) to show it in tree viewer, otherwise we

Constructor Summary

Constructors

Constructor and Description
LazySearchResultProvider()

Method Summary

Modifier and Type	Method and Description
protected void	addResult(Object tgoRef) Adds a new result to the cache.
void	dispose()
protected void	flushRequestedResults() Inserts all items that have been requested and returned into the treeViewer.
protected List<Object>	getCache()
Object	getParent(Object element)
void	inputChanged(Viewer viewer, Object oldInput, Object newInput) Called when a new query has been set as input.
void	updateChildCount(Object element, int currentChildCount)
void	updateElement(Object parent, int index)

Methods inherited from class java.lang.Object

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

Constructor Detail

LazySearchResultProvider

public LazySearchResultProvider()

Method Detail

getCache

protected List<Object> getCache()

dispose

public void dispose()

Specified by:

dispose in interface IContentProvider

inputChanged

public void inputChanged(Viewer viewer,
                         Object oldInput,
                         Object newInput)

Called when a new query has been set as input.

Specified by:

inputChanged in interface IContentProvider

flushRequestedResults

protected void flushRequestedResults()

Inserts all items that have been requested and returned into the treeViewer. May spawn a new fetch job afterwards. Can be run from a non-UI thread.

addResult

protected void addResult(Object tgoRef)

Adds a new result to the cache. May be called from any thread.

Parameters:

singleSearchResult - the result to add.

updateElement

public void updateElement(Object parent,
                          int index)

Specified by:

updateElement in interface ILazyTreeContentProvider

updateChildCount

public void updateChildCount(Object element,
                             int currentChildCount)

Specified by:

updateChildCount in interface ILazyTreeContentProvider

getParent

public Object getParent(Object element)

Specified by:

getParent in interface ILazyTreeContentProvider