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package com.fasterxml.jackson.databind.deser.std;
import java.io.IOException;
import java.util.Collection;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.annotation.JacksonStdImpl;
import com.fasterxml.jackson.databind.deser.ResolvableDeserializer;
import com.fasterxml.jackson.databind.deser.ValueInstantiator;
import com.fasterxml.jackson.databind.introspect.AnnotatedWithParams;
import com.fasterxml.jackson.databind.jsontype.TypeDeserializer;
/**
* Specifically optimized version for {@link java.util.Collection}s
* that contain String values; reason is that this is a very common
* type and we can make use of the fact that Strings are final.
*/
@JacksonStdImpl
public final class StringCollectionDeserializer
extends ContainerDeserializerBase<Collection<String>>
implements ResolvableDeserializer
{
// // Configuration
protected final JavaType _collectionType;
/**
* Value deserializer; needed even if it is the standard String
* deserializer
*/
protected final JsonDeserializer<String> _valueDeserializer;
/**
* Flag that indicates whether value deserializer is the standard
* Jackson-provided one; if it is, we can use more efficient
* handling.
*/
protected final boolean _isDefaultDeserializer;
// // Instance construction settings:
/**
* Instantiator used in case custom handling is needed for creation.
*/
protected final ValueInstantiator _valueInstantiator;
/**
* Deserializer that is used iff delegate-based creator is
* to be used for deserializing from JSON Object.
*/
protected JsonDeserializer<Object> _delegateDeserializer;
// NOTE: no PropertyBasedCreator, as JSON Arrays have no properties
/*
/**********************************************************
/* Life-cycle
/**********************************************************
*/
@SuppressWarnings("unchecked")
public StringCollectionDeserializer(JavaType collectionType, JsonDeserializer<?> valueDeser,
ValueInstantiator valueInstantiator)
{
super(collectionType.getRawClass());
_collectionType = collectionType;
_valueDeserializer = (JsonDeserializer<String>) valueDeser;
_valueInstantiator = valueInstantiator;
_isDefaultDeserializer = isDefaultSerializer(valueDeser);
}
/**
* Copy-constructor that can be used by sub-classes to allow
* copy-on-write styling copying of settings of an existing instance.
*/
protected StringCollectionDeserializer(StringCollectionDeserializer src)
{
super(src._valueClass);
_collectionType = src._collectionType;
_valueDeserializer = src._valueDeserializer;
_valueInstantiator = src._valueInstantiator;
_isDefaultDeserializer = src._isDefaultDeserializer;
}
/*
/**********************************************************
/* Validation, post-processing (ResolvableDeserializer)
/**********************************************************
*/
/**
* Method called to finalize setup of this deserializer,
* after deserializer itself has been registered. This
* is needed to handle recursive and transitive dependencies.
*/
@Override
public void resolve(DeserializationConfig config, DeserializerProvider provider)
throws JsonMappingException
{
// May need to resolve types for delegate-based creators:
AnnotatedWithParams delegateCreator = _valueInstantiator.getDelegateCreator();
if (delegateCreator != null) {
JavaType delegateType = _valueInstantiator.getDelegateType(config);
// Need to create a temporary property to allow contextual deserializers:
BeanProperty.Std property = new BeanProperty.Std(null,
delegateType, null, delegateCreator);
_delegateDeserializer = findDeserializer(config, provider, delegateType, property);
}
}
/*
/**********************************************************
/* ContainerDeserializerBase API
/**********************************************************
*/
@Override
public JavaType getContentType() {
return _collectionType.getContentType();
}
@SuppressWarnings("unchecked")
@Override
public JsonDeserializer<Object> getContentDeserializer() {
JsonDeserializer<?> deser = _valueDeserializer;
return (JsonDeserializer<Object>) deser;
}
/*
/**********************************************************
/* JsonDeserializer API
/**********************************************************
*/
@SuppressWarnings("unchecked")
@Override
public Collection<String> deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
if (_delegateDeserializer != null) {
return (Collection<String>) _valueInstantiator.createUsingDelegate(_delegateDeserializer.deserialize(jp, ctxt));
}
final Collection<String> result = (Collection<String>) _valueInstantiator.createUsingDefault();
return deserialize(jp, ctxt, result);
}
@Override
public Collection<String> deserialize(JsonParser jp, DeserializationContext ctxt,
Collection<String> result)
throws IOException, JsonProcessingException
{
// Ok: must point to START_ARRAY
if (!jp.isExpectedStartArrayToken()) {
return handleNonArray(jp, ctxt, result);
}
if (!_isDefaultDeserializer) {
return deserializeUsingCustom(jp, ctxt, result);
}
JsonToken t;
while ((t = jp.nextToken()) != JsonToken.END_ARRAY) {
result.add((t == JsonToken.VALUE_NULL) ? null : jp.getText());
}
return result;
}
private Collection<String> deserializeUsingCustom(JsonParser jp, DeserializationContext ctxt,
Collection<String> result)
throws IOException, JsonProcessingException
{
JsonToken t;
final JsonDeserializer<String> deser = _valueDeserializer;
while ((t = jp.nextToken()) != JsonToken.END_ARRAY) {
String value;
if (t == JsonToken.VALUE_NULL) {
value = null;
} else {
value = deser.deserialize(jp, ctxt);
}
result.add(value);
}
return result;
}
@Override
public Object deserializeWithType(JsonParser jp, DeserializationContext ctxt,
TypeDeserializer typeDeserializer)
throws IOException, JsonProcessingException
{
// In future could check current token... for now this should be enough:
return typeDeserializer.deserializeTypedFromArray(jp, ctxt);
}
/**
* Helper method called when current token is no START_ARRAY. Will either
* throw an exception, or try to handle value as if member of implicit
* array, depending on configuration.
*/
private final Collection<String> handleNonArray(JsonParser jp, DeserializationContext ctxt,
Collection<String> result)
throws IOException, JsonProcessingException
{
// [JACKSON-526]: implicit arrays from single values?
if (!ctxt.isEnabled(DeserializationConfig.Feature.ACCEPT_SINGLE_VALUE_AS_ARRAY)) {
throw ctxt.mappingException(_collectionType.getRawClass());
}
// Strings are one of "native" (intrinsic) types, so there's never type deserializer involved
JsonDeserializer<String> valueDes = _valueDeserializer;
JsonToken t = jp.getCurrentToken();
String value;
if (t == JsonToken.VALUE_NULL) {
value = null;
} else {
value = (valueDes == null) ? jp.getText() : valueDes.deserialize(jp, ctxt);
}
result.add(value);
return result;
}
}
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