Package org.eclipse.equinox.p2.metadata.index

Interface IIndexProvider<T>

All Known Implementing Classes:

CompoundQueryable, org.eclipse.equinox.internal.p2.metadata.index.IndexProvider

public interface IIndexProvider<T>

An index provider is typically an IQueryable.

Since:

2.0

Method Summary

Modifier and Type	Method	Description
Iterator<T>	everything()	Return the iterator that delivers all rows that the target query should consider.
IIndex<T>	getIndex(String memberName)	Return an index optimized for producing candidates based on values for a memberName that denotes a member of the index type.
Object	getManagedProperty(Object client, String memberName, Object key)	Returns a property that this index manages on behalf of a client object.

Method Details

getIndex

IIndex<T> getIndex(String memberName)

Return an index optimized for producing candidates based on values for a memberName that denotes a member of the index type.

Parameters:

memberName - A member of type T.

Returns:

An index or null if this provider does not support this index.

everything

Iterator<T> everything()

Return the iterator that delivers all rows that the target query should consider. This is used when no index can be found for any possible member.

Returns:

An iterator. Possibly empty but never null.

getManagedProperty

Object getManagedProperty(Object client,
 String memberName,
 Object key)

Returns a property that this index manages on behalf of a client object. Examples of this is the properties that a profile manages for installable units.

Parameters:

client - The client for which the property is managed. Typically an IU.

memberName - The name of the managed properties, i.e. "profileProperties"

key - The property key

Returns:

The managed property value or null if no value could be found.