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package org.glassfish.jersey.server.internal.inject;
import javax.ws.rs.ProcessingException;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.ParamConverter;
/**
* Extract value of the parameter using a single parameter value and the underlying
* {@link ParamConverter param converter}.
*
* @param extracted Java type.
* @author Paul Sandoz
* @author Marek Potociar (marek.potociar at oracle.com)
*/
final class SingleValueExtractor extends AbstractParamValueExtractor implements MultivaluedParameterExtractor {
/**
* Create new single value extractor.
*
* @param converter string value reader.
* @param parameterName string parameter name.
* @param defaultStringValue default string value.
*/
public SingleValueExtractor(ParamConverter converter, String parameterName, String defaultStringValue) {
super(converter, parameterName, defaultStringValue);
}
/**
* {@inheritDoc}
*
* This implementation extracts the value of the parameter applying the underlying
* {@link ParamConverter param converter} to the first value found in the list of potential multiple
* parameter values. Any other values in the multi-value list will be ignored.
*
* @param parameters map of parameters.
* @return extracted single parameter value.
*/
@Override
public T extract(MultivaluedMap parameters) {
String v = parameters.getFirst(getName());
if (v != null) {
try {
return fromString(v);
} catch (WebApplicationException ex) {
throw ex;
} catch (ProcessingException ex) {
throw ex;
} catch (Exception ex) {
throw new ExtractorException(ex);
}
} else {
return defaultValue();
}
}
}