ddf.catalog.filter

Interface FilterAdapter

All Known Implementing Classes:

GeotoolsFilterAdapterImpl

public interface FilterAdapter

FilterAdapter visits a Filter and invokes FilterDelegate methods with normalized, typed values. A large part of implementing a FilterVisitor is handling expressions, type casting literals, and supporting custom filter logic like FuzzyFunction s. The FilterAdapter handles all of this common boilerplate functionality. Furthermore, sources using the FilterAdapter will receive future enhancements and ensure basic compatibility with Endpoints that use the FilterBuilder.

To use the FilterAdapter, a FilterDelegate for the source is required. Here is an example using a text base filter delegate.

 FilterDelegate<String> delegate = new FilterToTextDelegate();

 FilterAdapter adapter = new FilterAdapterImpl();

 String result = adapter.adapt(filter, delegate);
 

A reference implementation is provided with the DDF Core in the Filter Proxy bundle.

Author:

ddf.isgs@lmco.com

See Also:

FilterDelegate

Method Summary

Modifier and Type	Method and Description
<T> T	adapt(org.opengis.filter.Filter filter, FilterDelegate<T> filterDelegate) Visit Filter nodes and invoke FilterDelegate methods with normalized input.

Method Detail

adapt

<T> T adapt(org.opengis.filter.Filter filter,
            FilterDelegate<T> filterDelegate)
     throws UnsupportedQueryException

Visit Filter nodes and invoke FilterDelegate methods with normalized input.

Parameters:

filter - OGC Filter to visit

filterDelegate - delegate to invoke will visiting

Returns:

result of adapted filter output

Throws:

UnsupportedQueryException