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package com.fasterxml.jackson.databind.deser.std;
import java.io.IOException;
import java.lang.reflect.Method;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.DeserializationConfig;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.introspect.AnnotatedMethod;
import com.fasterxml.jackson.databind.util.ClassUtil;
import com.fasterxml.jackson.databind.util.EnumResolver;
/**
* Deserializer class that can deserialize instances of
* specified Enum class from Strings and Integers.
*/
public class EnumDeserializer
extends StdScalarDeserializer<Enum<?>>
{
protected final EnumResolver<?> _resolver;
public EnumDeserializer(EnumResolver<?> res)
{
super(Enum.class);
_resolver = res;
}
/**
* Factory method used when Enum instances are to be deserialized
* using a creator (static factory method)
*
* @return Deserializer based on given factory method, if type was suitable;
* null if type can not be used
*/
public static JsonDeserializer<?> deserializerForCreator(DeserializationConfig config,
Class<?> enumClass, AnnotatedMethod factory)
{
// note: caller has verified there's just one arg; but we must verify its type
if (factory.getGenericParameterType(0) != String.class) {
throw new IllegalArgumentException("Parameter #0 type for factory method ("+factory+") not suitable, must be java.lang.String");
}
if (config.canOverrideAccessModifiers()) {
ClassUtil.checkAndFixAccess(factory.getMember());
}
return new FactoryBasedDeserializer(enumClass, factory);
}
/*
/**********************************************************
/* Default JsonDeserializer implementation
/**********************************************************
*/
/**
* Because of costs associated with constructing Enum resolvers,
* let's cache instances by default.
*/
@Override
public boolean isCachable() { return true; }
@Override
public Enum<?> deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
JsonToken curr = jp.getCurrentToken();
// Usually should just get string value:
if (curr == JsonToken.VALUE_STRING || curr == JsonToken.FIELD_NAME) {
String name = jp.getText();
Enum<?> result = _resolver.findEnum(name);
if (result == null) {
throw ctxt.weirdStringException(_resolver.getEnumClass(), "value not one of declared Enum instance names");
}
return result;
}
// But let's consider int acceptable as well (if within ordinal range)
if (curr == JsonToken.VALUE_NUMBER_INT) {
/* ... unless told not to do that. :-)
* (as per [JACKSON-412]
*/
if (ctxt.isEnabled(DeserializationFeature.FAIL_ON_NUMBERS_FOR_ENUMS)) {
throw ctxt.mappingException("Not allowed to deserialize Enum value out of JSON number (disable DeserializationConfig.DeserializationFeature.FAIL_ON_NUMBERS_FOR_ENUMS to allow)");
}
int index = jp.getIntValue();
Enum<?> result = _resolver.getEnum(index);
if (result == null) {
throw ctxt.weirdNumberException(_resolver.getEnumClass(), "index value outside legal index range [0.."+_resolver.lastValidIndex()+"]");
}
return result;
}
throw ctxt.mappingException(_resolver.getEnumClass());
}
/*
/**********************************************************
/* Default JsonDeserializer implementation
/**********************************************************
*/
/**
* Deserializer that uses a single-String static factory method
* for locating Enum values by String id.
*/
protected static class FactoryBasedDeserializer
extends StdScalarDeserializer<Object>
{
protected final Class<?> _enumClass;
protected final Method _factory;
public FactoryBasedDeserializer(Class<?> cls, AnnotatedMethod f)
{
super(Enum.class);
_enumClass = cls;
_factory = f.getAnnotated();
}
@Override
public Object deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
JsonToken curr = jp.getCurrentToken();
// Usually should just get string value:
if (curr != JsonToken.VALUE_STRING && curr != JsonToken.FIELD_NAME) {
throw ctxt.mappingException(_enumClass);
}
String value = jp.getText();
try {
return _factory.invoke(null, value);
} catch (Exception e) {
ClassUtil.unwrapAndThrowAsIAE(e);
}
return null;
}
}
}
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