sk.baka.ambient.collection.local
Class CollectionImpl

java.lang.Object
  sk.baka.ambient.collection.local.CollectionImpl

All Implemented Interfaces:

ICollection

public final class CollectionImpl
extends Object
implements ICollection

Collection strategy which uses local database (the Library).

Author:

Martin Vysny

Constructor Summary

CollectionImpl(Library l)
Creates new collection wrapper.

Method Summary

CategoryItem	deserializeItem(String id) Deserializes item serialized by ICollection.serializeItem(CategoryItem).
void	filterOrigin(TrackOriginEnum origin) Show tracks only with given origin.
List<TrackMetadataBean>	findTracks(Map<CategoryEnum,String> criteria) Search for tracks using given criteria search.
Map<String,String>	fixLocations(Collection<String> locations) Given locations became invalid and need fixing.
List<CategoryItem>	getCategoryList(CategoryEnum request, CategoryItem context, String substring, boolean sortByYear) Returns category list matching given criteria.
String	getName() Returns short descriptive name of this collection backend.
Statistics	getStatistics() Returns statistics for this collection.
List<TrackMetadataBean>	getTracks(CategoryItem context) Returns all tracks contained in given category.
boolean	isLocal() Checks if the underlying strategy uses local resources to retrieve metadata (a DB backend), or it uses remote access to a server (for example Ampache).
IDynamicPlaylistTrackProvider	newTrackProvider(Random random) Returns a new instance of the track provider.
List<TrackMetadataBean>	searchTracks(String substring) Search song which Song Title, Artist Name, Album Name or Genre Name contains given substring.
String	serializeItem(CategoryItem item) Returns ID returned by this collection in the CategoryItem.id as String.
boolean	supportsLocationFix() Serves for optimalization purposes only: checks if this collection can perform obsolete locations fixup or not.

Methods inherited from class java.lang.Object

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

Constructor Detail

CollectionImpl

public CollectionImpl(Library l)

Creates new collection wrapper.

Parameters:

l - the library to wrap.

Method Detail

getCategoryList

public List<CategoryItem> getCategoryList(CategoryEnum request,
                                          CategoryItem context,
                                          String substring,
                                          boolean sortByYear)
                                   throws InterruptedException

Description copied from interface: ICollection

Returns category list matching given criteria. Returns sorted list, either by name or by the year.

Specified by:

getCategoryList in interface ICollection

Parameters:

request - the category to search for. Must not be null.

context - search in context of this item. May be null - in this case all categories are returned.

substring - if not null then all category names must contain this substring.

sortByYear - if true then the result category list is sorted by year, then by name. If false then sorted only by name. Ignored when the request parameter is not an album.

Returns:

list of categories. Must not be null, may be empty.

Throws:

InterruptedException - when interrupted.

getTracks

public List<TrackMetadataBean> getTracks(CategoryItem context)
                                  throws InterruptedException

Description copied from interface: ICollection

Returns all tracks contained in given category.

Specified by:

getTracks in interface ICollection

Parameters:

context - search in context of this item. Must not be null.

Returns:

list of tracks, sorted in no particular order. Must not be null, may be empty.

Throws:

InterruptedException - when interrupted.

searchTracks

public List<TrackMetadataBean> searchTracks(String substring)
                                     throws InterruptedException

Description copied from interface: ICollection

Search song which Song Title, Artist Name, Album Name or Genre Name contains given substring.

Specified by:

searchTracks in interface ICollection

Parameters:

substring - the substring to search for.

Returns:

the list of tracks. Must not be null, may be empty. Sorted in no particular order.

Throws:

InterruptedException - when interrupted.

isLocal

public boolean isLocal()

Description copied from interface: ICollection

Checks if the underlying strategy uses local resources to retrieve metadata (a DB backend), or it uses remote access to a server (for example Ampache).

Specified by:

isLocal in interface ICollection

Returns:

true if the collection queries will tend to be performed fast, false otherwise.

getName

public String getName()

Description copied from interface: ICollection

Returns short descriptive name of this collection backend.

Specified by:

getName in interface ICollection

Returns:

the name.

filterOrigin

public void filterOrigin(TrackOriginEnum origin)

Show tracks only with given origin.

Parameters:

origin - the origin or null if tracks will be shown regardless of their origin.

getStatistics

public Statistics getStatistics()

Description copied from interface: ICollection

Returns statistics for this collection.

Specified by:

getStatistics in interface ICollection

Returns:

the statistics object, must not be null.

deserializeItem

public CategoryItem deserializeItem(String id)

Description copied from interface: ICollection

Deserializes item serialized by ICollection.serializeItem(CategoryItem). This item will be used to perform search only. This functionality is only used by AmpacheServer. You do not need to store the CategoryItem.category - it will be overwritten.

Specified by:

deserializeItem in interface ICollection

Parameters:

id - the item to deserialize

Returns:

the ID instance.

serializeItem

public String serializeItem(CategoryItem item)

Description copied from interface: ICollection

Returns ID returned by this collection in the CategoryItem.id as String. This item will only be used to perform searches - you should thus preserve minimum information from the category item. This functionality is only used by AmpacheServer. You do not need to store the CategoryItem.category - it will be overwritten.

Specified by:

serializeItem in interface ICollection

Parameters:

item - the item to convert

Returns:

string representation of given item.

newTrackProvider

public IDynamicPlaylistTrackProvider newTrackProvider(Random random)

Description copied from interface: ICollection

Returns a new instance of the track provider. May return null if this collection does not provide this functionality. It is caller's responsibility to close the provider.

Specified by:

newTrackProvider in interface ICollection

Parameters:

random - initially provide tracks using this random value.

Returns:

new provider instance, may be null.

findTracks

public List<TrackMetadataBean> findTracks(Map<CategoryEnum,String> criteria)

Description copied from interface: ICollection

Search for tracks using given criteria search.

Specified by:

findTracks in interface ICollection

Parameters:

criteria - the criteria, must not be null. AND operator is used if multiple criteria are specified. String values are matched as substrings.

Returns:

tracks that comply given criteria, in no particular order.

fixLocations

public Map<String,String> fixLocations(Collection<String> locations)

Description copied from interface: ICollection

Given locations became invalid and need fixing.

MediaPlayer detected an error while playing first location URL from given location list. All given locations might thus have become invalid. The collection is asked to fix these locations: it should re-connect to the server (if any) and/or perform any required steps. If any of these locations became completely invalid the method is free to omit them in the result map. If the collection is unable to fix given location then just pass input location.

Invoked asynchronously. This method will receive only locations provided earlier by track lookup methods such as ICollection.findTracks(Map).

Specified by:

fixLocations in interface ICollection

Parameters:

locations - the list of (possibly) invalid locations. Never null nor empty.

Returns:

a map of locations, maps original location to a fixed locations. Must not be null.

supportsLocationFix

public boolean supportsLocationFix()

Description copied from interface: ICollection

Serves for optimalization purposes only: checks if this collection can perform obsolete locations fixup or not.

Specified by:

supportsLocationFix in interface ICollection

Returns:

true if ICollection.fixLocations(Collection) is supported, false if the collection cannot fix the locations, or the fix operation is not applicable to this collection.