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com.fasterxml.jackson.databind.deser.std.ObjectArrayDeserializer 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.lang.reflect.Array;
import java.util.Objects;
import com.fasterxml.jackson.annotation.JsonFormat;
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.NullValueProvider;
import com.fasterxml.jackson.databind.jsontype.TypeDeserializer;
import com.fasterxml.jackson.databind.type.ArrayType;
import com.fasterxml.jackson.databind.type.LogicalType;
import com.fasterxml.jackson.databind.util.AccessPattern;
import com.fasterxml.jackson.databind.util.ObjectBuffer;
/**
* Basic serializer that can serialize non-primitive arrays.
*/
@JacksonStdImpl
public class ObjectArrayDeserializer
extends ContainerDeserializerBase
implements ContextualDeserializer
{
private static final long serialVersionUID = 1L;
// // Configuration
/**
* Flag that indicates whether the component type is Object or not.
* Used for minor optimization when constructing result.
*/
protected final boolean _untyped;
/**
* Type of contained elements: needed for constructing actual
* result array
*/
protected final Class _elementClass;
/**
* Element deserializer
*/
protected JsonDeserializer _elementDeserializer;
/**
* If element instances have polymorphic type information, this
* is the type deserializer that can handle it
*/
protected final TypeDeserializer _elementTypeDeserializer;
/**
* @since 2.12
*/
protected final Object[] _emptyValue;
/*
/**********************************************************
/* Life-cycle
/**********************************************************
*/
public ObjectArrayDeserializer(JavaType arrayType0,
JsonDeserializer elemDeser, TypeDeserializer elemTypeDeser)
{
super(arrayType0, null, null);
ArrayType arrayType = (ArrayType) arrayType0;
_elementClass = arrayType.getContentType().getRawClass();
_untyped = (_elementClass == Object.class);
_elementDeserializer = elemDeser;
_elementTypeDeserializer = elemTypeDeser;
_emptyValue = arrayType.getEmptyArray();
}
protected ObjectArrayDeserializer(ObjectArrayDeserializer base,
JsonDeserializer elemDeser, TypeDeserializer elemTypeDeser,
NullValueProvider nuller, Boolean unwrapSingle)
{
super(base, nuller, unwrapSingle);
_elementClass = base._elementClass;
_untyped = base._untyped;
_emptyValue = base._emptyValue;
_elementDeserializer = elemDeser;
_elementTypeDeserializer = elemTypeDeser;
}
/**
* Overridable fluent-factory method used to create contextual instances
*/
public ObjectArrayDeserializer withDeserializer(TypeDeserializer elemTypeDeser,
JsonDeserializer elemDeser)
{
return withResolved(elemTypeDeser, elemDeser,
_nullProvider, _unwrapSingle);
}
/**
* @since 2.7
*/
@SuppressWarnings("unchecked")
public ObjectArrayDeserializer withResolved(TypeDeserializer elemTypeDeser,
JsonDeserializer elemDeser, NullValueProvider nuller, Boolean unwrapSingle)
{
if ((Objects.equals(unwrapSingle, _unwrapSingle)) && (nuller == _nullProvider)
&& (elemDeser == _elementDeserializer)
&& (elemTypeDeser == _elementTypeDeserializer)) {
return this;
}
return new ObjectArrayDeserializer(this,
(JsonDeserializer) elemDeser, elemTypeDeser,
nuller, unwrapSingle);
}
@Override // since 2.5
public boolean isCachable() {
// Important: do NOT cache if polymorphic values, or if there are annotation-based
// custom deserializers
return (_elementDeserializer == null) && (_elementTypeDeserializer == null);
}
@Override // since 2.12
public LogicalType logicalType() {
return LogicalType.Array;
}
@Override
public JsonDeserializer createContextual(DeserializationContext ctxt,
BeanProperty property) throws JsonMappingException
{
JsonDeserializer valueDeser = _elementDeserializer;
// 07-May-2020, tatu: Is the argument `containerType.getRawClass()` right here?
// In a way seems like it should rather refer to value class... ?
// (as it's individual value of element type, not Container)...
Boolean unwrapSingle = findFormatFeature(ctxt, property, _containerType.getRawClass(),
JsonFormat.Feature.ACCEPT_SINGLE_VALUE_AS_ARRAY);
// May have a content converter
valueDeser = findConvertingContentDeserializer(ctxt, property, valueDeser);
final JavaType vt = _containerType.getContentType();
if (valueDeser == null) {
valueDeser = ctxt.findContextualValueDeserializer(vt, property);
} else { // if directly assigned, probably not yet contextual, so:
valueDeser = ctxt.handleSecondaryContextualization(valueDeser, property, vt);
}
TypeDeserializer elemTypeDeser = _elementTypeDeserializer;
if (elemTypeDeser != null) {
elemTypeDeser = elemTypeDeser.forProperty(property);
}
NullValueProvider nuller = findContentNullProvider(ctxt, property, valueDeser);
return withResolved(elemTypeDeser, valueDeser, nuller, unwrapSingle);
}
/*
/**********************************************************
/* ContainerDeserializerBase API
/**********************************************************
*/
@Override
public JsonDeserializer getContentDeserializer() {
return _elementDeserializer;
}
@Override // since 2.9
public AccessPattern getEmptyAccessPattern() {
// immutable, shareable so:
return AccessPattern.CONSTANT;
}
// need to override as we can't expose ValueInstantiator
@Override // since 2.9
public Object getEmptyValue(DeserializationContext ctxt) throws JsonMappingException {
// 03-Jul-2020, tatu: Must be assignment-compatible; can not just return `new Object[0]`
// if element type is different
return _emptyValue;
}
/*
/**********************************************************
/* JsonDeserializer API
/**********************************************************
*/
@Override
public Object[] deserialize(JsonParser p, DeserializationContext ctxt)
throws IOException
{
// Ok: must point to START_ARRAY (or equivalent)
if (!p.isExpectedStartArrayToken()) {
return handleNonArray(p, ctxt);
}
final ObjectBuffer buffer = ctxt.leaseObjectBuffer();
Object[] chunk = buffer.resetAndStart();
int ix = 0;
JsonToken t;
final TypeDeserializer typeDeser = _elementTypeDeserializer;
try {
while ((t = p.nextToken()) != JsonToken.END_ARRAY) {
// Note: must handle null explicitly here; value deserializers won't
Object value;
if (t == JsonToken.VALUE_NULL) {
if (_skipNullValues) {
continue;
}
value = _nullProvider.getNullValue(ctxt);
} else if (typeDeser == null) {
value = _elementDeserializer.deserialize(p, ctxt);
} else {
value = _elementDeserializer.deserializeWithType(p, ctxt, typeDeser);
}
if (ix >= chunk.length) {
chunk = buffer.appendCompletedChunk(chunk);
ix = 0;
}
chunk[ix++] = value;
}
} catch (Exception e) {
throw JsonMappingException.wrapWithPath(e, chunk, buffer.bufferedSize() + ix);
}
Object[] result;
if (_untyped) {
result = buffer.completeAndClearBuffer(chunk, ix);
} else {
result = buffer.completeAndClearBuffer(chunk, ix, _elementClass);
}
ctxt.returnObjectBuffer(buffer);
return result;
}
@Override
public Object[] deserializeWithType(JsonParser p, DeserializationContext ctxt,
TypeDeserializer typeDeserializer)
throws IOException
{
// Should there be separate handling for base64 stuff?
// for now this should be enough:
return (Object[]) typeDeserializer.deserializeTypedFromArray(p, ctxt);
}
@Override // since 2.9
public Object[] deserialize(JsonParser p, DeserializationContext ctxt,
Object[] intoValue) throws IOException
{
if (!p.isExpectedStartArrayToken()) {
Object[] arr = handleNonArray(p, ctxt);
if (arr == null) {
return intoValue;
}
final int offset = intoValue.length;
Object[] result = new Object[offset + arr.length];
System.arraycopy(intoValue, 0, result, 0, offset);
System.arraycopy(arr, 0, result, offset, arr.length);
return result;
}
final ObjectBuffer buffer = ctxt.leaseObjectBuffer();
int ix = intoValue.length;
Object[] chunk = buffer.resetAndStart(intoValue, ix);
JsonToken t;
final TypeDeserializer typeDeser = _elementTypeDeserializer;
try {
while ((t = p.nextToken()) != JsonToken.END_ARRAY) {
Object value;
if (t == JsonToken.VALUE_NULL) {
if (_skipNullValues) {
continue;
}
value = _nullProvider.getNullValue(ctxt);
} else if (typeDeser == null) {
value = _elementDeserializer.deserialize(p, ctxt);
} else {
value = _elementDeserializer.deserializeWithType(p, ctxt, typeDeser);
}
if (ix >= chunk.length) {
chunk = buffer.appendCompletedChunk(chunk);
ix = 0;
}
chunk[ix++] = value;
}
} catch (Exception e) {
throw JsonMappingException.wrapWithPath(e, chunk, buffer.bufferedSize() + ix);
}
Object[] result;
if (_untyped) {
result = buffer.completeAndClearBuffer(chunk, ix);
} else {
result = buffer.completeAndClearBuffer(chunk, ix, _elementClass);
}
ctxt.returnObjectBuffer(buffer);
return result;
}
/*
/**********************************************************
/* Internal methods
/**********************************************************
*/
protected Byte[] deserializeFromBase64(JsonParser p, DeserializationContext ctxt)
throws IOException
{
// First same as what PrimitiveArrayDeserializers.ByteDeser does:
byte[] b = p.getBinaryValue(ctxt.getBase64Variant());
// But then need to convert to wrappers
Byte[] result = new Byte[b.length];
for (int i = 0, len = b.length; i < len; ++i) {
result[i] = Byte.valueOf(b[i]);
}
return result;
}
protected Object[] handleNonArray(JsonParser p, DeserializationContext ctxt)
throws IOException
{
// Can we do implicit coercion to a single-element array still?
boolean canWrap = (_unwrapSingle == Boolean.TRUE) ||
((_unwrapSingle == null) &&
ctxt.isEnabled(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY));
if (!canWrap) {
// 2 exceptions with Strings:
if (p.hasToken(JsonToken.VALUE_STRING)) {
// One exception; byte arrays are generally serialized as base64, so that should be handled
// note: not `byte[]`, but `Byte[]` -- former is primitive array
if (_elementClass == Byte.class) {
return deserializeFromBase64(p, ctxt);
}
// Second: empty (and maybe blank) String
return _deserializeFromString(p, ctxt);
}
return (Object[]) ctxt.handleUnexpectedToken(_containerType, p);
}
Object value;
if (p.hasToken(JsonToken.VALUE_NULL)) {
// 03-Feb-2017, tatu: Should this be skipped or not?
if (_skipNullValues) {
return _emptyValue;
}
value = _nullProvider.getNullValue(ctxt);
} else if (_elementTypeDeserializer == null) {
value = _elementDeserializer.deserialize(p, ctxt);
} else {
value = _elementDeserializer.deserializeWithType(p, ctxt, _elementTypeDeserializer);
}
// Ok: bit tricky, since we may want T[], not just Object[]
Object[] result;
if (_untyped) {
result = new Object[1];
} else {
result = (Object[]) Array.newInstance(_elementClass, 1);
}
result[0] = value;
return result;
}
}
