com.fitbur.glassfish.jersey.internal.ExceptionMapperFactory Maven / Gradle / Ivy
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package com.fitbur.glassfish.com.fitbur.internal;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Proxy;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.util.Collection;
import java.util.Comparator;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeMap;
import java.util.TreeSet;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.inject.Inject;
import javax.inject.Singleton;
import javax.ws.rs.ProcessingException;
import javax.ws.rs.ext.ExceptionMapper;
import com.fitbur.glassfish.hk2.api.ActiveDescriptor;
import com.fitbur.glassfish.hk2.api.ServiceHandle;
import com.fitbur.glassfish.hk2.api.ServiceLocator;
import com.fitbur.glassfish.hk2.utilities.binding.AbstractBinder;
import com.fitbur.glassfish.com.fitbur.internal.inject.CustomAnnotationImpl;
import com.fitbur.glassfish.com.fitbur.internal.inject.Providers;
import com.fitbur.glassfish.com.fitbur.internal.util.ReflectionHelper;
import com.fitbur.glassfish.com.fitbur.internal.util.collection.ClassTypePair;
import com.fitbur.glassfish.com.fitbur.spi.ExceptionMappers;
import com.fitbur.glassfish.com.fitbur.spi.ExtendedExceptionMapper;
/**
* {@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.fitbur)
* @author Marek Potociar (marek.potociar at oracle.com.fitbur)
* @author Jakub Podlesak (jakub.podlesak at oracle.com.fitbur)
*/
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 {
ServiceHandle mapper;
Class exceptionType;
public ExceptionMapperType(final ServiceHandle mapper, final Class exceptionType) {
this.mapper = mapper;
this.exceptionType = exceptionType;
}
}
private Set exceptionMapperTypes = new LinkedHashSet();
@Override
@SuppressWarnings("unchecked")
public ExceptionMapper findMapping(final T exceptionInstance) {
return find((Class)exceptionInstance.getClass(), exceptionInstance);
}
@Override
public ExceptionMapper find(final Class type) {
return find(type, null);
}
@SuppressWarnings("unchecked")
private ExceptionMapper find(final Class type, final T exceptionInstance) {
final Map> orderedMappers = new TreeMap>();
for (final ExceptionMapperType mapperType : exceptionMapperTypes) {
final int d = distance(type, mapperType.exceptionType);
if (d >= 0) {
orderedMappers.put(d, mapperType.mapper.getService());
}
}
if (orderedMappers.size() == 0) {
return null;
}
if (exceptionInstance != null) {
for (final ExceptionMapper mapper : orderedMappers.values()) {
if (mapper instanceof ExtendedExceptionMapper) {
final boolean mappable = ((ExtendedExceptionMapper) mapper).isMappable(exceptionInstance);
if (mappable) {
return mapper;
}
} else {
return mapper;
}
}
return null;
} else {
return orderedMappers.values().iterator().next();
}
}
/**
* 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(final ServiceLocator locator) {
final Collection> mapperHandles =
Providers.getAllServiceHandles(locator, ExceptionMapper.class);
for (ServiceHandle mapperHandle : mapperHandles) {
final ExceptionMapper mapper = mapperHandle.getService();
if (Proxy.isProxyClass(mapper.getClass())) {
SortedSet> mapperTypes
= new TreeSet>(new Comparator>() {
@Override
public int com.fitburpare(Class o1, Class o2) {
return o1.isAssignableFrom(o2) ? -1 : 1;
}
});
final Set contracts = mapperHandle.getActiveDescriptor().getContractTypes();
for (Type contract : contracts) {
if (contract instanceof Class &&
ExceptionMapper.class.isAssignableFrom((Class)contract) && contract != ExceptionMapper.class) {
mapperTypes.add((Class) contract);
}
}
if (!mapperTypes.isEmpty()) {
final Class c = getExceptionType(mapperTypes.first());
if (c != null) {
exceptionMapperTypes.add(new ExceptionMapperType(mapperHandle, c));
}
}
} else {
final Class c = getExceptionType(mapper.getClass());
if (c != null) {
exceptionMapperTypes.add(new ExceptionMapperType(mapperHandle, c));
}
}
}
}
private int distance(Class c, final Class emtc) {
int distance = 0;
if (!emtc.isAssignableFrom(c)) {
return -1;
}
while (c != emtc) {
c = c.getSuperclass();
distance++;
}
return distance;
}
@SuppressWarnings("unchecked")
private Class getExceptionType(final Class c) {
final 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;
}
/**
* Get exception type for given exception mapper class.
*
* @param clazz class to get exception type for.
* @return exception type for given class.
*/
private Class getType(final Class clazz) {
Class clazzHolder = clazz;
while (clazzHolder != Object.class) {
final Class type = getTypeFromInterface(clazzHolder, clazz);
if (type != null) {
return type;
}
clazzHolder = clazzHolder.getSuperclass();
}
throw new ProcessingException(LocalizationMessages.ERROR_FINDING_EXCEPTION_MAPPER_TYPE(clazz));
}
/**
* Iterate through interface hierarchy of {@code clazz} and get exception type for given class.
*
* @param clazz class to inspect.
* @return exception type for given class or {@code null} if the class doesn't implement {@code ExceptionMapper}.
*/
private Class getTypeFromInterface(Class clazz, final Class original) {
final Type[] types = clazz.getGenericInterfaces();
for (final Type type : types) {
if (type instanceof ParameterizedType) {
final ParameterizedType pt = (ParameterizedType) type;
if (pt.getRawType() == ExceptionMapper.class
|| pt.getRawType() == ExtendedExceptionMapper.class) {
return getResolvedType(pt.getActualTypeArguments()[0], original, clazz);
}
} else if (type instanceof Class) {
clazz = (Class) type;
if (ExceptionMapper.class.isAssignableFrom(clazz)) {
return getTypeFromInterface(clazz, original);
}
}
}
return null;
}
private Class getResolvedType(final Type t, final Class c, final Class dc) {
if (t instanceof Class) {
return (Class) t;
} else if (t instanceof TypeVariable) {
final ClassTypePair ct = ReflectionHelper.resolveTypeVariable(c, dc, (TypeVariable) t);
if (ct != null) {
return ct.rawClass();
} else {
return null;
}
} else if (t instanceof ParameterizedType) {
final ParameterizedType pt = (ParameterizedType) t;
return (Class) pt.getRawType();
} else {
return null;
}
}
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