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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 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.jsontype.TypeDeserializer;
import com.fasterxml.jackson.databind.type.ArrayType;
import com.fasterxml.jackson.databind.util.ObjectBuffer;
/**
* Basic serializer that can serialize non-primitive arrays.
*/
@JacksonStdImpl
public class ObjectArrayDeserializer
extends ContainerDeserializerBase
implements ContextualDeserializer
{
// // Configuration
/**
* Full generic type of the array being deserialized
*/
protected final ArrayType _arrayType;
/**
* 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;
/*
/**********************************************************
/* Life-cycle
/**********************************************************
*/
public ObjectArrayDeserializer(ArrayType arrayType,
JsonDeserializer elemDeser, TypeDeserializer elemTypeDeser)
{
super(Object[].class);
_arrayType = arrayType;
_elementClass = arrayType.getContentType().getRawClass();
_untyped = (_elementClass == Object.class);
_elementDeserializer = elemDeser;
_elementTypeDeserializer = elemTypeDeser;
}
/**
* Overridable fluent-factory method used to create contextual instances
*/
@SuppressWarnings("unchecked")
public ObjectArrayDeserializer withDeserializer(TypeDeserializer elemTypeDeser,
JsonDeserializer elemDeser)
{
if ((elemDeser == _elementDeserializer) && (elemTypeDeser == _elementTypeDeserializer)) {
return this;
}
return new ObjectArrayDeserializer(_arrayType,
(JsonDeserializer) elemDeser, elemTypeDeser);
}
// @Override
public JsonDeserializer createContextual(DeserializationContext ctxt,
BeanProperty property) throws JsonMappingException
{
JsonDeserializer deser = _elementDeserializer;
if (deser == null) {
deser = ctxt.findContextualValueDeserializer(_arrayType.getContentType(), property);
} else { // if directly assigned, probably not yet contextual, so:
if (deser instanceof ContextualDeserializer) {
deser = ((ContextualDeserializer) deser).createContextual(ctxt, property);
}
}
TypeDeserializer elemTypeDeser = _elementTypeDeserializer;
if (elemTypeDeser != null) {
elemTypeDeser = elemTypeDeser.forProperty(property);
}
return withDeserializer(elemTypeDeser, deser);
}
/*
/**********************************************************
/* ContainerDeserializerBase API
/**********************************************************
*/
@Override
public JavaType getContentType() {
return _arrayType.getContentType();
}
@Override
public JsonDeserializer getContentDeserializer() {
return _elementDeserializer;
}
/*
/**********************************************************
/* JsonDeserializer API
/**********************************************************
*/
@Override
public Object[] deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
// Ok: must point to START_ARRAY (or equivalent)
if (!jp.isExpectedStartArrayToken()) {
return handleNonArray(jp, ctxt);
}
final ObjectBuffer buffer = ctxt.leaseObjectBuffer();
Object[] chunk = buffer.resetAndStart();
int ix = 0;
JsonToken t;
final TypeDeserializer typeDeser = _elementTypeDeserializer;
while ((t = jp.nextToken()) != JsonToken.END_ARRAY) {
// Note: must handle null explicitly here; value deserializers won't
Object value;
if (t == JsonToken.VALUE_NULL) {
value = null;
} else if (typeDeser == null) {
value = _elementDeserializer.deserialize(jp, ctxt);
} else {
value = _elementDeserializer.deserializeWithType(jp, ctxt, typeDeser);
}
if (ix >= chunk.length) {
chunk = buffer.appendCompletedChunk(chunk);
ix = 0;
}
chunk[ix++] = value;
}
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 jp, DeserializationContext ctxt,
TypeDeserializer typeDeserializer)
throws IOException, JsonProcessingException
{
/* Should there be separate handling for base64 stuff?
* for now this should be enough:
*/
return (Object[]) typeDeserializer.deserializeTypedFromArray(jp, ctxt);
}
/*
/**********************************************************
/* Internal methods
/**********************************************************
*/
protected Byte[] deserializeFromBase64(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
// First same as what PrimitiveArrayDeserializers.ByteDeser does:
byte[] b = jp.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;
}
private final Object[] handleNonArray(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
// [JACKSON-620] Empty String can become null...
if ((jp.getCurrentToken() == JsonToken.VALUE_STRING)
&& ctxt.isEnabled(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT)) {
String str = jp.getText();
if (str.length() == 0) {
return null;
}
}
// Can we do implicit coercion to a single-element array still?
if (!ctxt.isEnabled(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY)) {
/* 04-Oct-2009, tatu: One exception; byte arrays are generally
* serialized as base64, so that should be handled
*/
if (jp.getCurrentToken() == JsonToken.VALUE_STRING
&& _elementClass == Byte.class) {
return deserializeFromBase64(jp, ctxt);
}
throw ctxt.mappingException(_arrayType.getRawClass());
}
JsonToken t = jp.getCurrentToken();
Object value;
if (t == JsonToken.VALUE_NULL) {
value = null;
} else if (_elementTypeDeserializer == null) {
value = _elementDeserializer.deserialize(jp, ctxt);
} else {
value = _elementDeserializer.deserializeWithType(jp, 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;
}
}
