org.epics.pvmanager

Class DataSourceTypeSupport

java.lang.Object

org.epics.pvmanager.DataSourceTypeSupport

Direct Known Subclasses:

JCATypeSupport, PVATypeSupport

public class DataSourceTypeSupport
extends Object

The type support for a datasource. This optional class is provided to help create a more flexible type support in a datasource, so that support for individual types is done through runtime configuration. It provides default implementation for matching typeAdapters from the desired cache and connection payload.

Author:

carcassi

Constructor Summary

Constructors

Constructor and Description
DataSourceTypeSupport()

Method Summary

Methods

Modifier and Type	Method and Description
protected <C,T extends DataSourceTypeAdapter<? super C,?>> T	find(Collection<T> typeAdapters, ValueCache<?> cache, C connection) Given a collection of type datapters, finds the one that can store data in the cache given the channel information described in the connection payload.
protected String	formatMessage(ValueCache<?> cache, Object connection, int match, List<? extends DataSourceTypeAdapter<?,?>> matchedConverters) Formats the error message in case of not unique match.

Methods inherited from class java.lang.Object

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

Constructor Detail

DataSourceTypeSupport

public DataSourceTypeSupport()

Method Detail

find

protected <C,T extends DataSourceTypeAdapter<? super C,?>> T find(Collection<T> typeAdapters,
                                                      ValueCache<?> cache,
                                                      C connection)

Given a collection of type datapters, finds the one that can store data in the cache given the channel information described in the connection payload. If there isn't a unique match, an exception is thrown.

Type Parameters:

C - type of connection payload

T - datasource specific type adapter type

Parameters:

typeAdapters - a collection of type adapters

cache - the cache where to store the data

connection - the connection payload

Returns:

0 if the type was not matched

formatMessage

protected String formatMessage(ValueCache<?> cache,
                   Object connection,
                   int match,
                   List<? extends DataSourceTypeAdapter<?,?>> matchedConverters)

Formats the error message in case of not unique match. This allows data sources to give more specific error messages.

Parameters:

cache - the cache used for the match

connection - the connection payload used for the match

match - the result of the match

matchedConverters - the matched converters; will either be 0 (no match) or more than 1 (non unique match)

Returns:

the message to be passed with the exception