Is there a standalone Java implementation for retrieving parameter values in a URI as defined by a URI template (RFC 6570)?
The best implementation I've found is the ruby implementation ( https://github.com/sporkmonger/addressable )
Through http://code.google.com/p/uri-templates/wiki/Implementations I found a Java implementation: Handy-URI-Templates
It supports resolving a URI template with parameter values up to the final URI. Unfortunately, he cannot do the opposite: retrieving parameter values in a URI according to the URI-Template.
Implentations JAX-RS (or Restlet) has this feature inside. But not one of them isolated this functional module, which could be used independently.
Does anyone have any other idea?
Here is an example using spring-web:
import org.springframework.web.util.UriTemplate; public class UriParserSpringImpl implements UriParser { private final UriTemplate uriTemplate; private final String uriTemplateStr; public UriParserSpringImpl(final String template) { this.uriTemplateStr = template; this.uriTemplate = new UriTemplate(template); } @Override public Map<String, String> parse(final String uri) { final boolean match = this.uriTemplate.matches(uri); if (!match) { return null; } return uriUtils.decodeParams(this.uriTemplate.match(uri)); } @Override public Set<String> getVariables() { return Collections.unmodifiableSet(new LinkedHashSet<String>(this.uriTemplate.getVariableNames())); } }
Another for Jersey (JAX-RS implementation):
import com.sun.jersey.api.uri.UriTemplate; public class UriParserJerseyImpl implements UriParser { private final UriTemplate uriTemplate; private final Map<String, String> valuesMaps; public UriParserJerseyImpl(final String template) { this.uriTemplate = new UriTemplate(template); final Map<String, String> valuesMaps = new HashMap<String, String>(); for (final String prop : this.uriTemplate.getTemplateVariables()) { valuesMaps.put(prop, null); } this.valuesMaps = Collections.unmodifiableMap(valuesMaps); } @Override public Map<String, String> parse(final String uri) { final Map<String, String> values = new HashMap<String, String>(this.valuesMaps); final boolean match = this.uriTemplate.match(uri, values); if (!match) { return null; } return values; } @Override public Set<String> getVariables() { return this.valuesMaps.keySet(); } }
With interface:
public interface UriParser { public Set<String> getVariables(); public Map<String, String> parse(final String uri); }