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com.fasterxml.jackson.databind.deser.std.UntypedObjectDeserializer Maven / Gradle / Ivy
package com.fasterxml.jackson.databind.deser.std;
import java.io.IOException;
import java.util.*;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.BeanProperty;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.annotation.JacksonStdImpl;
import com.fasterxml.jackson.databind.deser.ContextualDeserializer;
import com.fasterxml.jackson.databind.deser.ResolvableDeserializer;
import com.fasterxml.jackson.databind.jsontype.TypeDeserializer;
import com.fasterxml.jackson.databind.type.TypeFactory;
import com.fasterxml.jackson.databind.util.ClassUtil;
import com.fasterxml.jackson.databind.util.ObjectBuffer;
/**
* Deserializer implementation that is used if it is necessary to bind content of
* "unknown" type; something declared as basic {@link java.lang.Object}
* (either explicitly, or due to type erasure).
* If so, "natural" mapping is used to convert JSON values to their natural
* Java object matches: JSON arrays to Java {@link java.util.List}s (or, if configured,
* Object[]), JSON objects to {@link java.util.Map}s, numbers to
* {@link java.lang.Number}s, booleans to {@link java.lang.Boolean}s and
* strings to {@link java.lang.String} (and nulls to nulls).
*/
@JacksonStdImpl
public class UntypedObjectDeserializer
extends StdDeserializer
implements ResolvableDeserializer, ContextualDeserializer
{
private static final long serialVersionUID = 1L;
protected final static Object[] NO_OBJECTS = new Object[0];
/**
* @deprecated Since 2.3, construct a new instance, needs to be resolved
*/
@Deprecated
public final static UntypedObjectDeserializer instance = new UntypedObjectDeserializer(null, null);
/*
/**********************************************************
/* Possible custom deserializer overrides we need to use
/**********************************************************
*/
protected JsonDeserializer _mapDeserializer;
protected JsonDeserializer _listDeserializer;
protected JsonDeserializer _stringDeserializer;
protected JsonDeserializer _numberDeserializer;
/**
* If {@link java.util.List} has been mapped to non-default implementation,
* we'll store type here
*
* @since 2.6
*/
protected JavaType _listType;
/**
* If {@link java.util.Map} has been mapped to non-default implementation,
* we'll store type here
*
* @since 2.6
*/
protected JavaType _mapType;
/**
* @deprecated Since 2.6 use variant takes type arguments
*/
@Deprecated
public UntypedObjectDeserializer() {
this(null, null);
}
public UntypedObjectDeserializer(JavaType listType, JavaType mapType) {
super(Object.class);
_listType = listType;
_mapType = mapType;
}
@SuppressWarnings("unchecked")
public UntypedObjectDeserializer(UntypedObjectDeserializer base,
JsonDeserializer mapDeser, JsonDeserializer listDeser,
JsonDeserializer stringDeser, JsonDeserializer numberDeser)
{
super(Object.class);
_mapDeserializer = (JsonDeserializer) mapDeser;
_listDeserializer = (JsonDeserializer) listDeser;
_stringDeserializer = (JsonDeserializer) stringDeser;
_numberDeserializer = (JsonDeserializer) numberDeser;
_listType = base._listType;
_mapType = base._mapType;
}
/*
/**********************************************************
/* Initialization
/**********************************************************
*/
/**
* We need to implement this method to properly find things to delegate
* to: it can not be done earlier since delegated deserializers almost
* certainly require access to this instance (at least "List" and "Map" ones)
*/
@SuppressWarnings("unchecked")
@Override
public void resolve(DeserializationContext ctxt) throws JsonMappingException
{
JavaType obType = ctxt.constructType(Object.class);
JavaType stringType = ctxt.constructType(String.class);
TypeFactory tf = ctxt.getTypeFactory();
/* 26-Nov-2014, tatu: This is highly unusual, as in general contextualization
* should always be called separately, from within "createContextual()".
* But this is a very singular deserializer since it operates on `Object`
* (and often for `?` type parameter), and as a result, easily and commonly
* results in cycles, being value deserializer for various Maps and Collections.
* Because of this, we must somehow break the cycles. This is done here by
* forcing pseudo-contextualization with null property.
*/
// So: first find possible custom instances
if (_listType == null) {
_listDeserializer = _clearIfStdImpl(_findCustomDeser(ctxt, tf.constructCollectionType(List.class, obType)));
} else {
// NOTE: if non-default List type, always consider to be non-standard deser
_listDeserializer = _findCustomDeser(ctxt, _listType);
}
if (_mapType == null) {
_mapDeserializer = _clearIfStdImpl(_findCustomDeser(ctxt, tf.constructMapType(Map.class, stringType, obType)));
} else {
// NOTE: if non-default Map type, always consider to be non-standard deser
_mapDeserializer = _findCustomDeser(ctxt, _mapType);
}
_stringDeserializer = _clearIfStdImpl(_findCustomDeser(ctxt, stringType));
_numberDeserializer = _clearIfStdImpl(_findCustomDeser(ctxt, tf.constructType(Number.class)));
// and then do bogus contextualization, in case custom ones need to resolve dependencies of
// their own
JavaType unknown = TypeFactory.unknownType();
_mapDeserializer = (JsonDeserializer) ctxt.handleSecondaryContextualization(_mapDeserializer, null, unknown);
_listDeserializer = (JsonDeserializer) ctxt.handleSecondaryContextualization(_listDeserializer, null, unknown);
_stringDeserializer = (JsonDeserializer) ctxt.handleSecondaryContextualization(_stringDeserializer, null, unknown);
_numberDeserializer = (JsonDeserializer) ctxt.handleSecondaryContextualization(_numberDeserializer, null, unknown);
}
protected JsonDeserializer _findCustomDeser(DeserializationContext ctxt, JavaType type)
throws JsonMappingException
{
// Since we are calling from `resolve`, we should NOT try to contextualize yet;
// contextualization will only occur at a later point
return ctxt.findNonContextualValueDeserializer(type);
}
protected JsonDeserializer _clearIfStdImpl(JsonDeserializer deser) {
return ClassUtil.isJacksonStdImpl(deser) ? null : deser;
}
/**
* We only use contextualization for optimizing the case where no customization
* occurred; if so, can slip in a more streamlined version.
*/
@Override
public JsonDeserializer createContextual(DeserializationContext ctxt,
BeanProperty property) throws JsonMappingException
{
// 20-Apr-2014, tatu: If nothing custom, let's use "vanilla" instance,
// simpler and can avoid some of delegation
if ((_stringDeserializer == null) && (_numberDeserializer == null)
&& (_mapDeserializer == null) && (_listDeserializer == null)
&& getClass() == UntypedObjectDeserializer.class) {
return Vanilla.std;
}
return this;
}
protected JsonDeserializer _withResolved(JsonDeserializer mapDeser,
JsonDeserializer listDeser,
JsonDeserializer stringDeser, JsonDeserializer numberDeser) {
return new UntypedObjectDeserializer(this,
mapDeser, listDeser, stringDeser, numberDeser);
}
/*
/**********************************************************
/* Deserializer API
/**********************************************************
*/
/* 07-Nov-2014, tatu: When investigating [databind#604], realized that it makes
* sense to also mark this is cachable, since lookup not exactly free, and
* since it's not uncommon to "read anything"
*/
@Override
public boolean isCachable() {
/* 26-Mar-2015, tatu: With respect to [databind#735], there are concerns over
* cachability. It seems like we SHOULD be safe here; but just in case there
* are problems with false sharing, this may need to be revisited.
*/
return true;
}
@Override
public Object deserialize(JsonParser p, DeserializationContext ctxt) throws IOException
{
switch (p.getCurrentTokenId()) {
case JsonTokenId.ID_START_OBJECT:
case JsonTokenId.ID_FIELD_NAME:
// 28-Oct-2015, tatu: [databind#989] We may also be given END_OBJECT (similar to FIELD_NAME),
// if caller has advanced to the first token of Object, but for empty Object
case JsonTokenId.ID_END_OBJECT:
if (_mapDeserializer != null) {
return _mapDeserializer.deserialize(p, ctxt);
}
return mapObject(p, ctxt);
case JsonTokenId.ID_START_ARRAY:
if (ctxt.isEnabled(DeserializationFeature.USE_JAVA_ARRAY_FOR_JSON_ARRAY)) {
return mapArrayToArray(p, ctxt);
}
if (_listDeserializer != null) {
return _listDeserializer.deserialize(p, ctxt);
}
return mapArray(p, ctxt);
case JsonTokenId.ID_EMBEDDED_OBJECT:
return p.getEmbeddedObject();
case JsonTokenId.ID_STRING:
if (_stringDeserializer != null) {
return _stringDeserializer.deserialize(p, ctxt);
}
return p.getText();
case JsonTokenId.ID_NUMBER_INT:
if (_numberDeserializer != null) {
return _numberDeserializer.deserialize(p, ctxt);
}
/* Caller may want to get all integral values returned as {@link java.math.BigInteger},
* or {@link java.lang.Long} for consistency
*/
if (ctxt.hasSomeOfFeatures(F_MASK_INT_COERCIONS)) {
return _coerceIntegral(p, ctxt);
}
return p.getNumberValue(); // should be optimal, whatever it is
case JsonTokenId.ID_NUMBER_FLOAT:
if (_numberDeserializer != null) {
return _numberDeserializer.deserialize(p, ctxt);
}
/* [JACKSON-72]: need to allow overriding the behavior regarding
* which type to use
*/
if (ctxt.isEnabled(DeserializationFeature.USE_BIG_DECIMAL_FOR_FLOATS)) {
return p.getDecimalValue();
}
return p.getDoubleValue();
case JsonTokenId.ID_TRUE:
return Boolean.TRUE;
case JsonTokenId.ID_FALSE:
return Boolean.FALSE;
case JsonTokenId.ID_NULL: // should not get this but...
return null;
// case JsonTokenId.ID_END_ARRAY: // invalid
default:
}
throw ctxt.mappingException(Object.class);
}
@Override
public Object deserializeWithType(JsonParser p, DeserializationContext ctxt, TypeDeserializer typeDeserializer) throws IOException
{
switch (p.getCurrentTokenId()) {
// First: does it look like we had type id wrapping of some kind?
case JsonTokenId.ID_START_ARRAY:
case JsonTokenId.ID_START_OBJECT:
case JsonTokenId.ID_FIELD_NAME:
/* Output can be as JSON Object, Array or scalar: no way to know
* a this point:
*/
return typeDeserializer.deserializeTypedFromAny(p, ctxt);
case JsonTokenId.ID_EMBEDDED_OBJECT:
return p.getEmbeddedObject();
/* Otherwise we probably got a "native" type (ones that map
* naturally and thus do not need or use type ids)
*/
case JsonTokenId.ID_STRING:
if (_stringDeserializer != null) {
return _stringDeserializer.deserialize(p, ctxt);
}
return p.getText();
case JsonTokenId.ID_NUMBER_INT:
if (_numberDeserializer != null) {
return _numberDeserializer.deserialize(p, ctxt);
}
// May need coercion to "bigger" types:
if (ctxt.hasSomeOfFeatures(F_MASK_INT_COERCIONS)) {
return _coerceIntegral(p, ctxt);
}
return p.getNumberValue(); // should be optimal, whatever it is
case JsonTokenId.ID_NUMBER_FLOAT:
if (_numberDeserializer != null) {
return _numberDeserializer.deserialize(p, ctxt);
}
if (ctxt.isEnabled(DeserializationFeature.USE_BIG_DECIMAL_FOR_FLOATS)) {
return p.getDecimalValue();
}
return Double.valueOf(p.getDoubleValue());
case JsonTokenId.ID_TRUE:
return Boolean.TRUE;
case JsonTokenId.ID_FALSE:
return Boolean.FALSE;
case JsonTokenId.ID_NULL: // should not get this far really but...
return null;
default:
}
throw ctxt.mappingException(Object.class);
}
/*
/**********************************************************
/* Internal methods
/**********************************************************
*/
/**
* Method called to map a JSON Array into a Java value.
*/
protected Object mapArray(JsonParser jp, DeserializationContext ctxt) throws IOException
{
// Minor optimization to handle small lists (default size for ArrayList is 10)
if (jp.nextToken() == JsonToken.END_ARRAY) {
return new ArrayList(2);
}
Object value = deserialize(jp, ctxt);
if (jp.nextToken() == JsonToken.END_ARRAY) {
ArrayList l = new ArrayList(2);
l.add(value);
return l;
}
Object value2 = deserialize(jp, ctxt);
if (jp.nextToken() == JsonToken.END_ARRAY) {
ArrayList l = new ArrayList(2);
l.add(value);
l.add(value2);
return l;
}
ObjectBuffer buffer = ctxt.leaseObjectBuffer();
Object[] values = buffer.resetAndStart();
int ptr = 0;
values[ptr++] = value;
values[ptr++] = value2;
int totalSize = ptr;
do {
value = deserialize(jp, ctxt);
++totalSize;
if (ptr >= values.length) {
values = buffer.appendCompletedChunk(values);
ptr = 0;
}
values[ptr++] = value;
} while (jp.nextToken() != JsonToken.END_ARRAY);
// let's create full array then
ArrayList result = new ArrayList(totalSize);
buffer.completeAndClearBuffer(values, ptr, result);
return result;
}
/**
* Method called to map a JSON Object into a Java value.
*/
protected Object mapObject(JsonParser p, DeserializationContext ctxt) throws IOException
{
String key1;
JsonToken t = p.getCurrentToken();
if (t == JsonToken.START_OBJECT) {
key1 = p.nextFieldName();
} else if (t == JsonToken.FIELD_NAME) {
key1 = p.getCurrentName();
} else {
if (t != JsonToken.END_OBJECT) {
throw ctxt.mappingException(handledType(), p.getCurrentToken());
}
key1 = null;
}
if (key1 == null) {
// empty map might work; but caller may want to modify... so better just give small modifiable
return new LinkedHashMap(2);
}
// minor optimization; let's handle 1 and 2 entry cases separately
// 24-Mar-2015, tatu: Ideally, could use one of 'nextXxx()' methods, but for
// that we'd need new method(s) in JsonDeserializer. So not quite yet.
p.nextToken();
Object value1 = deserialize(p, ctxt);
String key2 = p.nextFieldName();
if (key2 == null) { // has to be END_OBJECT, then
// single entry; but we want modifiable
LinkedHashMap result = new LinkedHashMap(2);
result.put(key1, value1);
return result;
}
p.nextToken();
Object value2 = deserialize(p, ctxt);
String key = p.nextFieldName();
if (key == null) {
LinkedHashMap result = new LinkedHashMap(4);
result.put(key1, value1);
result.put(key2, value2);
return result;
}
// And then the general case; default map size is 16
LinkedHashMap result = new LinkedHashMap();
result.put(key1, value1);
result.put(key2, value2);
do {
p.nextToken();
result.put(key, deserialize(p, ctxt));
} while ((key = p.nextFieldName()) != null);
return result;
}
/**
* Method called to map a JSON Array into a Java Object array (Object[]).
*/
protected Object[] mapArrayToArray(JsonParser jp, DeserializationContext ctxt) throws IOException
{
// Minor optimization to handle small lists (default size for ArrayList is 10)
if (jp.nextToken() == JsonToken.END_ARRAY) {
return NO_OBJECTS;
}
ObjectBuffer buffer = ctxt.leaseObjectBuffer();
Object[] values = buffer.resetAndStart();
int ptr = 0;
do {
Object value = deserialize(jp, ctxt);
if (ptr >= values.length) {
values = buffer.appendCompletedChunk(values);
ptr = 0;
}
values[ptr++] = value;
} while (jp.nextToken() != JsonToken.END_ARRAY);
return buffer.completeAndClearBuffer(values, ptr);
}
/*
/**********************************************************
/* Separate "vanilla" implementation for common case of
/* no custom deserializer overrides
/**********************************************************
*/
@JacksonStdImpl
public static class Vanilla
extends StdDeserializer
{
private static final long serialVersionUID = 1L;
public final static Vanilla std = new Vanilla();
public Vanilla() { super(Object.class); }
@Override
public Object deserialize(JsonParser p, DeserializationContext ctxt) throws IOException
{
switch (p.getCurrentTokenId()) {
case JsonTokenId.ID_START_OBJECT:
{
JsonToken t = p.nextToken();
if (t == JsonToken.END_OBJECT) {
return new LinkedHashMap(2);
}
}
case JsonTokenId.ID_FIELD_NAME:
return mapObject(p, ctxt);
case JsonTokenId.ID_START_ARRAY:
{
JsonToken t = p.nextToken();
if (t == JsonToken.END_ARRAY) { // and empty one too
if (ctxt.isEnabled(DeserializationFeature.USE_JAVA_ARRAY_FOR_JSON_ARRAY)) {
return NO_OBJECTS;
}
return new ArrayList(2);
}
}
if (ctxt.isEnabled(DeserializationFeature.USE_JAVA_ARRAY_FOR_JSON_ARRAY)) {
return mapArrayToArray(p, ctxt);
}
return mapArray(p, ctxt);
case JsonTokenId.ID_EMBEDDED_OBJECT:
return p.getEmbeddedObject();
case JsonTokenId.ID_STRING:
return p.getText();
case JsonTokenId.ID_NUMBER_INT:
if (ctxt.hasSomeOfFeatures(F_MASK_INT_COERCIONS)) {
return _coerceIntegral(p, ctxt);
}
return p.getNumberValue(); // should be optimal, whatever it is
case JsonTokenId.ID_NUMBER_FLOAT:
if (ctxt.isEnabled(DeserializationFeature.USE_BIG_DECIMAL_FOR_FLOATS)) {
return p.getDecimalValue();
}
return Double.valueOf(p.getDoubleValue());
case JsonTokenId.ID_TRUE:
return Boolean.TRUE;
case JsonTokenId.ID_FALSE:
return Boolean.FALSE;
case JsonTokenId.ID_NULL: // should not get this but...
return null;
case JsonTokenId.ID_END_OBJECT:
// 28-Oct-2015, tatu: [databind#989] We may also be given END_OBJECT (similar to FIELD_NAME),
// if caller has advanced to the first token of Object, but for empty Object
return new LinkedHashMap(2);
//case JsonTokenId.ID_END_ARRAY: // invalid
default:
throw ctxt.mappingException(Object.class);
}
}
@Override
public Object deserializeWithType(JsonParser jp, DeserializationContext ctxt, TypeDeserializer typeDeserializer) throws IOException
{
switch (jp.getCurrentTokenId()) {
case JsonTokenId.ID_START_ARRAY:
case JsonTokenId.ID_START_OBJECT:
case JsonTokenId.ID_FIELD_NAME:
return typeDeserializer.deserializeTypedFromAny(jp, ctxt);
case JsonTokenId.ID_STRING:
return jp.getText();
case JsonTokenId.ID_NUMBER_INT:
if (ctxt.isEnabled(DeserializationFeature.USE_BIG_INTEGER_FOR_INTS)) {
return jp.getBigIntegerValue();
}
return jp.getNumberValue();
case JsonTokenId.ID_NUMBER_FLOAT:
if (ctxt.isEnabled(DeserializationFeature.USE_BIG_DECIMAL_FOR_FLOATS)) {
return jp.getDecimalValue();
}
return Double.valueOf(jp.getDoubleValue());
case JsonTokenId.ID_TRUE:
return Boolean.TRUE;
case JsonTokenId.ID_FALSE:
return Boolean.FALSE;
case JsonTokenId.ID_EMBEDDED_OBJECT:
return jp.getEmbeddedObject();
case JsonTokenId.ID_NULL: // should not get this far really but...
return null;
default:
throw ctxt.mappingException(Object.class);
}
}
protected Object mapArray(JsonParser jp, DeserializationContext ctxt) throws IOException
{
Object value = deserialize(jp, ctxt);
if (jp.nextToken() == JsonToken.END_ARRAY) {
ArrayList l = new ArrayList(2);
l.add(value);
return l;
}
Object value2 = deserialize(jp, ctxt);
if (jp.nextToken() == JsonToken.END_ARRAY) {
ArrayList l = new ArrayList(2);
l.add(value);
l.add(value2);
return l;
}
ObjectBuffer buffer = ctxt.leaseObjectBuffer();
Object[] values = buffer.resetAndStart();
int ptr = 0;
values[ptr++] = value;
values[ptr++] = value2;
int totalSize = ptr;
do {
value = deserialize(jp, ctxt);
++totalSize;
if (ptr >= values.length) {
values = buffer.appendCompletedChunk(values);
ptr = 0;
}
values[ptr++] = value;
} while (jp.nextToken() != JsonToken.END_ARRAY);
// let's create full array then
ArrayList result = new ArrayList(totalSize);
buffer.completeAndClearBuffer(values, ptr, result);
return result;
}
/**
* Method called to map a JSON Object into a Java value.
*/
protected Object mapObject(JsonParser p, DeserializationContext ctxt) throws IOException
{
// will point to FIELD_NAME at this point, guaranteed
String key1 = p.getText();
p.nextToken();
Object value1 = deserialize(p, ctxt);
String key2 = p.nextFieldName();
if (key2 == null) { // single entry; but we want modifiable
LinkedHashMap result = new LinkedHashMap(2);
result.put(key1, value1);
return result;
}
p.nextToken();
Object value2 = deserialize(p, ctxt);
String key = p.nextFieldName();
if (key == null) {
LinkedHashMap result = new LinkedHashMap(4);
result.put(key1, value1);
result.put(key2, value2);
return result;
}
// And then the general case; default map size is 16
LinkedHashMap result = new LinkedHashMap();
result.put(key1, value1);
result.put(key2, value2);
do {
p.nextToken();
result.put(key, deserialize(p, ctxt));
} while ((key = p.nextFieldName()) != null);
return result;
}
/**
* Method called to map a JSON Array into a Java Object array (Object[]).
*/
protected Object[] mapArrayToArray(JsonParser jp, DeserializationContext ctxt) throws IOException {
ObjectBuffer buffer = ctxt.leaseObjectBuffer();
Object[] values = buffer.resetAndStart();
int ptr = 0;
do {
Object value = deserialize(jp, ctxt);
if (ptr >= values.length) {
values = buffer.appendCompletedChunk(values);
ptr = 0;
}
values[ptr++] = value;
} while (jp.nextToken() != JsonToken.END_ARRAY);
return buffer.completeAndClearBuffer(values, ptr);
}
}
}