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com.fasterxml.jackson.databind.deser.std.StringCollectionDeserializer Maven / Gradle / Ivy
General data-binding functionality for Jackson: works on core streaming API
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.ContextualDeserializer;
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>
implements ContextualDeserializer
{
private static final long serialVersionUID = 1L;
// // Configuration
protected final JavaType _collectionType;
/**
* Value deserializer to use, if NOT the standard one
* (if it is, will be null).
*/
protected final JsonDeserializer _valueDeserializer;
// // 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 final JsonDeserializer _delegateDeserializer;
// NOTE: no PropertyBasedCreator, as JSON Arrays have no properties
/*
/**********************************************************
/* Life-cycle
/**********************************************************
*/
public StringCollectionDeserializer(JavaType collectionType,
JsonDeserializer valueDeser, ValueInstantiator valueInstantiator)
{
this(collectionType, valueInstantiator, null, valueDeser);
}
@SuppressWarnings("unchecked")
protected StringCollectionDeserializer(JavaType collectionType,
ValueInstantiator valueInstantiator, JsonDeserializer delegateDeser,
JsonDeserializer valueDeser)
{
super(collectionType.getRawClass());
_collectionType = collectionType;
_valueDeserializer = (JsonDeserializer) valueDeser;
_valueInstantiator = valueInstantiator;
_delegateDeserializer = (JsonDeserializer) delegateDeser;
}
protected StringCollectionDeserializer withResolved(JsonDeserializer delegateDeser,
JsonDeserializer valueDeser)
{
if ((_valueDeserializer == valueDeser) && (_delegateDeserializer == delegateDeser)) {
return this;
}
return new StringCollectionDeserializer(_collectionType,
_valueInstantiator, delegateDeser, valueDeser);
}
/*
/**********************************************************
/* Validation, post-processing
/**********************************************************
*/
// @Override
@SuppressWarnings("unchecked")
public JsonDeserializer createContextual(DeserializationContext ctxt,
BeanProperty property) throws JsonMappingException
{
// May need to resolve types for delegate-based creators:
JsonDeserializer delegate = null;
if (_valueInstantiator != null) {
AnnotatedWithParams delegateCreator = _valueInstantiator.getDelegateCreator();
if (delegateCreator != null) {
JavaType delegateType = _valueInstantiator.getDelegateType(ctxt.getConfig());
delegate = findDeserializer(ctxt, delegateType, property);
}
}
JsonDeserializer valueDeser = _valueDeserializer;
if (valueDeser == null) {
// And we may also need to get deserializer for String
JsonDeserializer deser = ctxt.findContextualValueDeserializer(
_collectionType.getContentType(), property);
valueDeser = (JsonDeserializer) deser;
} else { // if directly assigned, probably not yet contextual, so:
if (valueDeser instanceof ContextualDeserializer) {
valueDeser = ((ContextualDeserializer) valueDeser).createContextual(ctxt, property);
}
}
if (isDefaultDeserializer(valueDeser)) {
valueDeser = null;
}
return withResolved(delegate, valueDeser);
}
/*
/**********************************************************
/* ContainerDeserializerBase API
/**********************************************************
*/
@Override
public JavaType getContentType() {
return _collectionType.getContentType();
}
@SuppressWarnings("unchecked")
@Override
public JsonDeserializer getContentDeserializer() {
JsonDeserializer deser = _valueDeserializer;
return (JsonDeserializer) deser;
}
/*
/**********************************************************
/* JsonDeserializer API
/**********************************************************
*/
@SuppressWarnings("unchecked")
@Override
public Collection deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
if (_delegateDeserializer != null) {
return (Collection) _valueInstantiator.createUsingDelegate(ctxt,
_delegateDeserializer.deserialize(jp, ctxt));
}
final Collection result = (Collection) _valueInstantiator.createUsingDefault(ctxt);
return deserialize(jp, ctxt, result);
}
@Override
public Collection deserialize(JsonParser jp, DeserializationContext ctxt,
Collection result)
throws IOException, JsonProcessingException
{
// Ok: must point to START_ARRAY
if (!jp.isExpectedStartArrayToken()) {
return handleNonArray(jp, ctxt, result);
}
if (_valueDeserializer != null) {
return deserializeUsingCustom(jp, ctxt, result, _valueDeserializer);
}
JsonToken t;
while ((t = jp.nextToken()) != JsonToken.END_ARRAY) {
result.add((t == JsonToken.VALUE_NULL) ? null : _parseString(jp, ctxt));
}
return result;
}
private Collection deserializeUsingCustom(JsonParser jp, DeserializationContext ctxt,
Collection result, final JsonDeserializer deser)
throws IOException, JsonProcessingException
{
JsonToken t;
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 handleNonArray(JsonParser jp, DeserializationContext ctxt,
Collection result)
throws IOException, JsonProcessingException
{
// [JACKSON-526]: implicit arrays from single values?
if (!ctxt.isEnabled(DeserializationFeature.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 valueDes = _valueDeserializer;
JsonToken t = jp.getCurrentToken();
String value;
if (t == JsonToken.VALUE_NULL) {
value = null;
} else {
value = (valueDes == null) ? _parseString(jp, ctxt) : valueDes.deserialize(jp, ctxt);
}
result.add(value);
return result;
}
}
