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package org.glassfish.jersey.server.spi.internal;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
import javax.ws.rs.NotSupportedException;
import javax.ws.rs.ProcessingException;
import javax.ws.rs.WebApplicationException;
import org.glassfish.jersey.internal.inject.Providers;
import org.glassfish.jersey.message.internal.MessageBodyProviderNotFoundException;
import org.glassfish.jersey.server.internal.process.MappableException;
import org.glassfish.jersey.server.model.Parameter;
import org.glassfish.jersey.server.model.Parameterized;
import org.glassfish.hk2.api.Factory;
import org.glassfish.hk2.api.ServiceLocator;
/**
* Utility methods for retrieving values or value providers for the
* {@link Parameterized parameterized} resource model components.
*
* @author Marek Potociar (marek.potociar at oracle.com)
*/
public final class ParameterValueHelper {
/**
* Get the array of parameter values.
*
* @param valueProviders a list of value providers.
* @return array of parameter values provided by the value providers.
*/
public static Object[] getParameterValues(List<Factory<?>> valueProviders) {
final Object[] params = new Object[valueProviders.size()];
try {
int index = 0;
for (Factory<?> valueProvider : valueProviders) {
params[index++] = valueProvider.provide();
}
return params;
} catch (WebApplicationException e) {
throw e;
} catch (MessageBodyProviderNotFoundException e) {
throw new NotSupportedException(e);
} catch (ProcessingException e) {
throw e;
} catch (RuntimeException e) {
throw new MappableException("Exception obtaining parameters", e);
}
}
/**
* Create list of parameter value providers for the given {@link Parameterized
* parameterized} resource model component.
*
* @param locator HK2 service locator.
* @param parameterized parameterized resource model component.
* @return list of parameter value providers for the parameterized component.
*/
public static List<Factory<?>> createValueProviders(final ServiceLocator locator, final Parameterized parameterized) {
if ((null == parameterized.getParameters()) || (0 == parameterized.getParameters().size())) {
return Collections.emptyList();
}
List<ValueFactoryProvider> valueFactoryProviders = new ArrayList<ValueFactoryProvider>(
Providers.getProviders(locator, ValueFactoryProvider.class));
Collections.sort(valueFactoryProviders, new Comparator<ValueFactoryProvider>() {
@Override
public int compare(ValueFactoryProvider o1, ValueFactoryProvider o2) {
return o2.getPriority().getWeight() - o1.getPriority().getWeight();
}
});
boolean entityParamFound = false;
final List<Factory<?>> providers = new ArrayList<Factory<?>>(parameterized.getParameters().size());
for (final Parameter parameter : parameterized.getParameters()) {
entityParamFound = entityParamFound || Parameter.Source.ENTITY == parameter.getSource();
providers.add(getValueFactory(valueFactoryProviders, parameter));
}
if (!entityParamFound && Collections.frequency(providers, null) == 1) {
// Try to find entity if there is one unresolved parameter and the annotations are unknown
final int entityParamIndex = providers.lastIndexOf(null);
final Parameter parameter = parameterized.getParameters().get(entityParamIndex);
if (Parameter.Source.UNKNOWN == parameter.getSource() && !parameter.isQualified()) {
providers.set(entityParamIndex, getValueFactory(
valueFactoryProviders,
Parameter.overrideSource(parameter, Parameter.Source.ENTITY)));
}
}
return providers;
}
private static Factory<?> getValueFactory(Collection<ValueFactoryProvider> valueFactoryProviders, final Parameter parameter) {
Factory<?> valueFactory = null;
final Iterator<ValueFactoryProvider> vfpIterator = valueFactoryProviders.iterator();
while (valueFactory == null && vfpIterator.hasNext()) {
valueFactory = vfpIterator.next().getValueFactory(parameter);
}
return valueFactory;
}
/**
* Prevents instantiation.
*/
private ParameterValueHelper() {
}
}