org.glassfish.jersey.internal.ExceptionMapperFactory Maven / Gradle / Ivy
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package org.glassfish.jersey.internal;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.util.HashSet;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.ws.rs.ext.ExceptionMapper;
import javax.inject.Inject;
import javax.inject.Singleton;
import org.glassfish.jersey.internal.inject.AbstractBinder;
import org.glassfish.jersey.internal.inject.Providers;
import org.glassfish.jersey.internal.util.ReflectionHelper;
import org.glassfish.jersey.internal.util.collection.ClassTypePair;
import org.glassfish.jersey.spi.ExceptionMappers;
import org.glassfish.hk2.api.ServiceLocator;
/**
* {@link ExceptionMappers Exception mappers} implementation that aggregates
* exception mappers and server as the main entry point for exception mapper
* instance lookup.
*
* @author Paul Sandoz
* @author Santiago Pericas-Geertsen (Santiago.PericasGeertsen at oracle.com)
* @author Marek Potociar (marek.potociar at oracle.com)
*/
public class ExceptionMapperFactory implements ExceptionMappers {
private static final Logger LOGGER = Logger.getLogger(ExceptionMapperFactory.class.getName());
/**
* Exception mapper factory injection binder.
*/
public static class Binder extends AbstractBinder {
@Override
protected void configure() {
bindAsContract(ExceptionMapperFactory.class).to(ExceptionMappers.class).in(Singleton.class);
}
}
private static class ExceptionMapperType {
ExceptionMapper mapper;
Class exceptionType;
public ExceptionMapperType(ExceptionMapper mapper, Class exceptionType) {
this.mapper = mapper;
this.exceptionType = exceptionType;
}
}
private Set exceptionMapperTypes = new HashSet();
/**
* Create new exception mapper factory initialized with {@link ServiceLocator
* HK2 service locator} instance that will be used to look up all providers implementing
* {@link ExceptionMapper} interface.
*
* @param locator HK2 service locator.
*/
@Inject
public ExceptionMapperFactory(ServiceLocator locator) {
for (ExceptionMapper mapper : Providers.getAllProviders(locator, ExceptionMapper.class)) {
Class c = getExceptionType(mapper.getClass());
if (c != null) {
exceptionMapperTypes.add(new ExceptionMapperType(mapper, c));
}
}
}
@Override
@SuppressWarnings("unchecked")
public ExceptionMapper find(Class type) {
int distance = Integer.MAX_VALUE;
ExceptionMapper selectedEm = null;
for (ExceptionMapperType mapperType : exceptionMapperTypes) {
int d = distance(type, mapperType.exceptionType);
if (d < distance) {
distance = d;
selectedEm = mapperType.mapper;
if (distance == 0) {
break;
}
}
}
return selectedEm;
}
private int distance(Class c, Class emtc) {
int distance = 0;
if (!emtc.isAssignableFrom(c)) {
return Integer.MAX_VALUE;
}
while (c != emtc) {
c = c.getSuperclass();
distance++;
}
return distance;
}
@SuppressWarnings("unchecked")
private Class getExceptionType(Class c) {
Class t = getType(c);
if (Throwable.class.isAssignableFrom(t)) {
return (Class) t;
}
if (LOGGER.isLoggable(Level.WARNING)) {
LOGGER.warning(LocalizationMessages.EXCEPTION_MAPPER_SUPPORTED_TYPE_UNKNOWN(c.getName()));
}
return null;
}
private Class getType(Class c) {
Class _c = c;
while (_c != Object.class) {
Type[] ts = _c.getGenericInterfaces();
for (Type t : ts) {
if (t instanceof ParameterizedType) {
ParameterizedType pt = (ParameterizedType) t;
if (pt.getRawType() == ExceptionMapper.class) {
return getResolvedType(pt.getActualTypeArguments()[0], c, _c);
}
}
}
_c = _c.getSuperclass();
}
// This statement will never be reached
return null;
}
private Class getResolvedType(Type t, Class c, Class dc) {
if (t instanceof Class) {
return (Class) t;
} else if (t instanceof TypeVariable) {
ClassTypePair ct = ReflectionHelper.resolveTypeVariable(c, dc, (TypeVariable) t);
if (ct != null) {
return ct.rawClass();
} else {
return null;
}
} else if (t instanceof ParameterizedType) {
ParameterizedType pt = (ParameterizedType) t;
return (Class) pt.getRawType();
} else {
return null;
}
}
}