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Figure 9-1 Search architecture overview Let s take a look at Figure 9-1, starting from the right and working our way to the left A query has to be written in SQL Full-Text extensions syntax and submitted to the Enterprise Search Service The search engine runs these queries against the full-text index and property store The full-text index contains all text content; the property store contains the properties retrieved from documents The index engine processes text content and properties filtered from content sources and determines what is written to the full-text index and what goes into the property store The index engine creates an inverse index of content The inverse index is a data structure with a row for each term This row contains information about the documents in which the term appears, along with the number of occurrences and relative position of the term within each document.

ALfloat rolloffFactor; ALfloat referenceDistance; ALfloat maxDistance;

[locationManager stopUpdatingLocation];

@property(nonatomic, assign) ALfloat rolloffFactor; @property(nonatomic, assign) ALfloat referenceDistance; @property(nonatomic, assign) ALfloat maxDistance;

The location manager delegate must conform to the CLLocationManagerDelegate protocol, which defines two methods, both of which are optional. One of these methods is called by the Location Manager when it has determined the current location or when it detects a change in location. The other method is called when the Location Manager encounters an error.

The inverse index allows probabilistic ranking and fast retrieval of information Word breakers and stemmers are used by both the search engine and the index engine Word breakers determine where the word boundaries lie: they break up compound words and phrases Stemmers generate inflected forms of a word ( run, running, ran ) The Gatherer manages the content-crawling process and has rules that determine what content is crawled You can determine which content stores are crawled by configuring SharePoint Portal Server content sources The Gatherer maintains a queue of URLs to access The Gatherer is responsible for accessing documents that are stored in a content source The Gatherer defers this responsibility to the Filter Daemon The Gatherer (via the Filter Daemon) fetches the stream of content via a protocol handler and passes it on to the appropriate filter.

In EWSoundSourceObject.m, Initialize the defaults to match the OpenAL defaults in the init method:

When the Location Manager wants to inform its delegate of the current location, it calls the locationManager:didUpdateToLocation:fromLocation: method. This method has three parameters. The first parameter is the Location Manager that called the method. The second is a CLLocation object that defines the current location of the iPhone, and the third is a CLLocation object that defines the previous location from the last update. The first time this method is called, the previous location object will be nil.

rolloffFactor = 1.0; // 0.0 disables attenuation referenceDistance = 1.0; maxDistance = FLT_MAX;

These filters are also called IFilters (because that is the name of the interface that needs to be implemented by every filter) Every document type is associated with its own IFilter IFilters extract textual information from a specific document format Probably the most important IFilter is the Microsoft Office filter, which can extract terms from Office formats such as Word, Excel, and PowerPoint documents If you do not have an IFilter for a specific file type, you will not be able to search within such documents If you want, you can create your own custom IFilters..

Set the properties in applyState:

Location information is passed from the Location Manager using instances of the CLLocation class. This class has five properties that might be of interest to your application. The latitude and longitude are stored in a property called coordinate. To get the latitude and longitude in degrees, do this:

alSourcef(sourceID, AL_ROLLOFF_FACTOR, rolloffFactor); alSourcef(sourceID, AL_REFERENCE_DISTANCE, referenceDistance); alSourcef(sourceID, AL_MAX_DISTANCE, maxDistance);

CLLocationDegrees latitude = theLocation.coordinate.latitude; CLLocationDegrees longitude = theLocation.coordinate.longitude;

There are several commercial vendors that specialize in building IFilters that can be used within Microsoft Office SharePoint Server 2007 environments. The IFilterShop (http://www.ifiltershop.com/) is an example of such a commercial vendor.

In BBSceneController.m, change the distance model in init from AL_NONE to something else. For our example, we will use AL_INVERSE_DISTANCE_CLAMPED.