de.bmiag.tapir.datasource.api

Class DataProviderImpl

java.lang.Object

de.bmiag.tapir.datasource.api.DataProviderImpl

All Implemented Interfaces:

DataProvider

@Component
public class DataProviderImpl
extends Object
implements DataProvider

Default implementation of DataProvider. The class uses a three step process to determine the data source:

1. Asks the ListableBeanFactory for data sources which provide the given dataType.
2. For each candidate it calls DataSource.getSelectorType() and ensures the returned class to be compatible with the given selector.
3. Calls DataSource.canHandle(Object) for each data source candidate and filters all candidates which return true.

If an only if there is exactly one data source remaining, the DataSource.getData(Object) method of this data source is invoked and returned.

Since:

3.0.0

Author:

Oliver Libutzki <[email protected]>

Constructor Summary

Constructors

Constructor and Description
DataProviderImpl()

Method Summary

Modifier and Type	Method and Description
<SelectorType,DataType> Iterable<DataType>	getData(Class<DataType> dataType, SelectorType selector) Provides an Iterable of the given data type.

Methods inherited from class java.lang.Object

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

Constructor Detail

DataProviderImpl

public DataProviderImpl()

Method Detail

getData

public <SelectorType,DataType> Iterable<DataType> getData(Class<DataType> dataType,
                                                          SelectorType selector)

Description copied from interface: DataProvider

Provides an Iterable of the given data type. Based on the requested type and the given selector the method tries to find exactly one data source which is able to handle the request. If it succeeds, DataSource.getData(Object) is called an returned.

Specified by:

getData in interface DataProvider

Parameters:

dataType - Type of the requested data

selector - the selector which is used to determine the data to be provided

Returns:

An Iterable of the requested data type