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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.Iterator;
import java.util.List;
import java.util.function.Function;
import java.util.stream.Collectors;
import javax.ws.rs.NotSupportedException;
import javax.ws.rs.ProcessingException;
import javax.ws.rs.WebApplicationException;
import org.glassfish.jersey.message.internal.MessageBodyProviderNotFoundException;
import org.glassfish.jersey.server.ContainerRequest;
import org.glassfish.jersey.server.internal.process.MappableException;
import org.glassfish.jersey.server.model.Parameter;
import org.glassfish.jersey.server.model.Parameterized;
/**
* 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> valueProviders, ContainerRequest request) {
final Object[] params = new Object[valueProviders.size()];
try {
int entityProviderIndex = -1;
int index = 0;
for (ParamValueFactoryWithSource paramValProvider : valueProviders) {
// entity provider has to be called last; see JERSEY-2642
if (paramValProvider.getSource().equals(Parameter.Source.ENTITY)) {
entityProviderIndex = index++;
continue;
}
params[index++] = paramValProvider.apply(request);
}
if (entityProviderIndex != -1) {
params[entityProviderIndex] = valueProviders.get(entityProviderIndex).apply(request);
}
return params;
} catch (WebApplicationException e) {
throw e;
} catch (MessageBodyProviderNotFoundException e) {
throw new NotSupportedException(e);
} catch (ProcessingException e) {
throw e;
} catch (RuntimeException e) {
if (e.getCause() instanceof WebApplicationException) {
throw (WebApplicationException) e.getCause();
}
throw new MappableException("Exception obtaining parameters", e);
}
}
/**
* Create list of parameter value providers for the given {@link Parameterized
* parameterized} resource model component.
*
* @param valueSuppliers all registered value suppliers.
* @param parameterized parameterized resource model component.
* @return list of parameter value providers for the parameterized component.
*/
public static List> createValueProviders(Collection valueSuppliers,
Parameterized parameterized) {
if ((null == parameterized.getParameters()) || (0 == parameterized.getParameters().size())) {
return Collections.emptyList();
}
List valueParamProviders = valueSuppliers.stream()
.sorted((o1, o2) -> o2.getPriority().getWeight() - o1.getPriority().getWeight())
.collect(Collectors.toList());
boolean entityParamFound = false;
final List> providers = new ArrayList<>(parameterized.getParameters().size());
for (final Parameter parameter : parameterized.getParameters()) {
final Parameter.Source parameterSource = parameter.getSource();
entityParamFound = entityParamFound || Parameter.Source.ENTITY == parameterSource;
final Function valueFunction = getParamValueProvider(valueParamProviders, parameter);
if (valueFunction != null) {
providers.add(wrapParamValueProvider(valueFunction, parameterSource));
} else {
providers.add(null);
}
}
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()) {
final Parameter overriddenParameter = Parameter.overrideSource(parameter, Parameter.Source.ENTITY);
final Function valueFunction = getParamValueProvider(
valueParamProviders,
overriddenParameter);
if (valueFunction != null) {
providers.set(entityParamIndex, wrapParamValueProvider(valueFunction, overriddenParameter.getSource()));
} else {
providers.set(entityParamIndex, null);
}
}
}
return providers;
}
private static ParamValueFactoryWithSource wrapParamValueProvider(
Function factory, Parameter.Source paramSource) {
return new ParamValueFactoryWithSource<>(factory, paramSource);
}
private static Function getParamValueProvider(
Collection valueProviders, final Parameter parameter) {
Function valueProvider = null;
Iterator vfpIterator = valueProviders.iterator();
while (valueProvider == null && vfpIterator.hasNext()) {
valueProvider = vfpIterator.next().getValueProvider(parameter);
}
return valueProvider;
}
/**
* Prevents instantiation.
*/
private ParameterValueHelper() {
}
}