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Jackson (https://github.com/FasterXML/jackson) extension module
used to enhance performance using bytecode generation to replace use of Reflection for
field access and method calls
package com.fasterxml.jackson.module.afterburner.deser;
import java.io.IOException;
import java.lang.annotation.Annotation;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.core.JsonParser.NumberType;
import com.fasterxml.jackson.core.io.NumberInput;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.deser.*;
import com.fasterxml.jackson.databind.introspect.AnnotatedMember;
import com.fasterxml.jackson.databind.util.ClassUtil;
/**
* Base class for concrete type-specific {@link SettableBeanProperty}
* implementations.
*/
abstract class OptimizedSettableBeanProperty>
extends SettableBeanProperty
{
private static final long serialVersionUID = 1L; // since 2.5
/**
* We will need to keep the original instance handy as
* some calls are best just delegated
*/
protected final SettableBeanProperty _originalSettable;
protected final BeanPropertyMutator _propertyMutator;
protected final int _optimizedIndex;
/*
/**********************************************************************
/* Life-cycle
/**********************************************************************
*/
public OptimizedSettableBeanProperty(SettableBeanProperty src,
BeanPropertyMutator mutator, int index)
{
super(src);
_originalSettable = src;
_propertyMutator = mutator;
_optimizedIndex = index;
}
protected OptimizedSettableBeanProperty(OptimizedSettableBeanProperty src,
JsonDeserializer deser)
{
super(src, deser);
_originalSettable = src._originalSettable.withValueDeserializer(deser);
_propertyMutator = src._propertyMutator;
_optimizedIndex = src._optimizedIndex;
}
protected OptimizedSettableBeanProperty(OptimizedSettableBeanProperty src,
PropertyName name)
{
super(src, name);
_originalSettable = src._originalSettable.withName(name);
_propertyMutator = src._propertyMutator;
_optimizedIndex = src._optimizedIndex;
}
@Override
public abstract SettableBeanProperty withValueDeserializer(JsonDeserializer deser);
public abstract SettableBeanProperty withMutator(BeanPropertyMutator mut);
/*
/**********************************************************************
/* Overridden getters
/**********************************************************************
*/
@Override
public A getAnnotation(Class ann) {
return _originalSettable.getAnnotation(ann);
}
@Override
public AnnotatedMember getMember() {
return _originalSettable.getMember();
}
/*
/**********************************************************************
/* Deserialization, regular
/**********************************************************************
*/
@Override
public abstract void deserializeAndSet(JsonParser jp, DeserializationContext ctxt,
Object arg2) throws IOException, JsonProcessingException;
@Override
public abstract void set(Object bean, Object value) throws IOException;
/*
/**********************************************************************
/* Deserialization, builders
/**********************************************************************
*/
/* !!! 19-Feb-2012, tatu:
*
* We do not yet generate code for these methods: it would not be hugely
* difficult to add them, but let's first see if anyone needs them...
* (it is non-trivial, adds code etc, so not without cost).
*
* That is: we'll use Reflection fallback for Builder-based deserialization,
* so it will not be significantly faster.
*/
@Override
public abstract Object deserializeSetAndReturn(JsonParser jp,
DeserializationContext ctxt, Object instance) throws IOException;
@Override
public Object setAndReturn(Object instance, Object value) throws IOException {
return _originalSettable.setAndReturn(instance, value);
}
/*
/**********************************************************************
/* Extended API
/**********************************************************************
*/
public SettableBeanProperty getOriginalProperty() {
return _originalSettable;
}
public int getOptimizedIndex() {
return _optimizedIndex;
}
/*
/**********************************************************************
/* Helper methods
/**********************************************************************
*/
protected final boolean _deserializeBoolean(JsonParser p, DeserializationContext ctxt) throws IOException
{
JsonToken t = p.getCurrentToken();
if (t == JsonToken.VALUE_TRUE) return true;
if (t == JsonToken.VALUE_FALSE) return false;
if (t == JsonToken.VALUE_NULL) return false;
if (t == JsonToken.VALUE_NUMBER_INT) {
// 11-Jan-2012, tatus: May be outside of int...
if (p.getNumberType() == NumberType.INT) {
return (p.getIntValue() != 0);
}
return _deserializeBooleanFromOther(p, ctxt);
}
// And finally, let's allow Strings to be converted too
if (t == JsonToken.VALUE_STRING) {
String text = p.getText().trim();
if ("true".equals(text) || "True".equals(text)) {
return true;
}
if ("false".equals(text) || "False".equals(text) || text.length() == 0) {
return false;
}
if (_hasTextualNull(text)) {
return false;
}
throw ctxt.weirdStringException(text, Boolean.TYPE, "only \"true\" or \"false\" recognized");
}
// [databind#381]
if (t == JsonToken.START_ARRAY && ctxt.isEnabled(DeserializationFeature.UNWRAP_SINGLE_VALUE_ARRAYS)) {
p.nextToken();
final boolean parsed = _deserializeBooleanFromOther(p, ctxt);
t = p.nextToken();
if (t != JsonToken.END_ARRAY) {
throw ctxt.wrongTokenException(p, JsonToken.END_ARRAY,
"Attempted to unwrap single value array for single 'boolean' value but there was more than a single value in the array");
}
return parsed;
}
// Otherwise, no can do:
throw ctxt.mappingException(Boolean.TYPE, t);
}
protected final short _deserializeShort(JsonParser jp, DeserializationContext ctxt)
throws IOException
{
int value = _deserializeInt(jp, ctxt);
// So far so good: but does it fit?
if (value < Short.MIN_VALUE || value > Short.MAX_VALUE) {
throw ctxt.weirdStringException(String.valueOf(value),
Short.TYPE, "overflow, value can not be represented as 16-bit value");
}
return (short) value;
}
protected final int _deserializeInt(JsonParser p, DeserializationContext ctxt)
throws IOException
{
if (p.hasToken(JsonToken.VALUE_NUMBER_INT)) {
return p.getIntValue();
}
JsonToken t = p.getCurrentToken();
if (t == JsonToken.VALUE_STRING) { // let's do implicit re-parse
String text = p.getText().trim();
if (_hasTextualNull(text)) {
return 0;
}
try {
int len = text.length();
if (len > 9) {
long l = Long.parseLong(text);
if (l < Integer.MIN_VALUE || l > Integer.MAX_VALUE) {
throw ctxt.weirdStringException(text, Integer.TYPE,
"Overflow: numeric value ("+text+") out of range of int ("+Integer.MIN_VALUE+" - "+Integer.MAX_VALUE+")");
}
return (int) l;
}
if (len == 0) {
return 0;
}
return NumberInput.parseInt(text);
} catch (IllegalArgumentException iae) {
throw ctxt.weirdStringException(text, Integer.TYPE, "not a valid int value");
}
}
if (t == JsonToken.VALUE_NUMBER_FLOAT) {
if (!ctxt.isEnabled(DeserializationFeature.ACCEPT_FLOAT_AS_INT)) {
_failDoubleToIntCoercion(p, ctxt, "int");
}
return p.getValueAsInt();
}
if (t == JsonToken.VALUE_NULL) {
return 0;
}
if (t == JsonToken.START_ARRAY && ctxt.isEnabled(DeserializationFeature.UNWRAP_SINGLE_VALUE_ARRAYS)) {
p.nextToken();
final int parsed = _deserializeInt(p, ctxt);
t = p.nextToken();
if (t != JsonToken.END_ARRAY) {
throw ctxt.wrongTokenException(p, JsonToken.END_ARRAY,
"Attempted to unwrap single value array for single 'int' value but there was more than a single value in the array");
}
return parsed;
}
// Otherwise, no can do:
throw ctxt.mappingException(Integer.TYPE, t);
}
protected final long _deserializeLong(JsonParser p, DeserializationContext ctxt)
throws IOException
{
switch (p.getCurrentTokenId()) {
case JsonTokenId.ID_NUMBER_INT:
return p.getLongValue();
case JsonTokenId.ID_NUMBER_FLOAT:
if (!ctxt.isEnabled(DeserializationFeature.ACCEPT_FLOAT_AS_INT)) {
_failDoubleToIntCoercion(p, ctxt, "long");
}
return p.getValueAsLong();
case JsonTokenId.ID_STRING:
String text = p.getText().trim();
if (text.length() == 0 || _hasTextualNull(text)) {
return 0L;
}
try {
return NumberInput.parseLong(text);
} catch (IllegalArgumentException iae) { }
throw ctxt.weirdStringException(text, Long.TYPE, "not a valid long value");
case JsonTokenId.ID_NULL:
return 0L;
case JsonTokenId.ID_START_ARRAY:
if (ctxt.isEnabled(DeserializationFeature.UNWRAP_SINGLE_VALUE_ARRAYS)) {
p.nextToken();
final long parsed = _deserializeLong(p, ctxt);
JsonToken t = p.nextToken();
if (t != JsonToken.END_ARRAY) {
throw ctxt.wrongTokenException(p, JsonToken.END_ARRAY,
"Attempted to unwrap single value array for single 'long' value but there was more than a single value in the array");
}
return parsed;
}
break;
}
throw ctxt.mappingException(Long.TYPE, p.getCurrentToken());
}
protected final String _deserializeString(JsonParser p, DeserializationContext ctxt) throws IOException
{
switch (p.getCurrentTokenId()) {
case JsonTokenId.ID_STRING:
return p.getText();
case JsonTokenId.ID_NULL:
return null;
case JsonTokenId.ID_START_ARRAY:
if (ctxt.isEnabled(DeserializationFeature.UNWRAP_SINGLE_VALUE_ARRAYS)) {
p.nextToken();
final String parsed = _deserializeString(p, ctxt);
if (p.nextToken() != JsonToken.END_ARRAY) {
throw ctxt.wrongTokenException(p, JsonToken.END_ARRAY,
"Attempted to unwrap single value array for single 'String' value but there was more than a single value in the array");
}
return parsed;
}
break;
case JsonTokenId.ID_EMBEDDED_OBJECT:
Object ob = p.getEmbeddedObject();
if (ob == null) {
return null;
}
if (ob instanceof byte[]) {
return Base64Variants.getDefaultVariant().encode((byte[]) ob, false);
}
// otherwise, try conversion using toString()...
return ob.toString();
default:
// allow coercions for other scalar types
String text = p.getValueAsString();
if (text != null) {
return text;
}
}
throw ctxt.mappingException(String.class, p.getCurrentToken());
}
protected final boolean _deserializeBooleanFromOther(JsonParser p, DeserializationContext ctxt)
throws IOException
{
if (p.getNumberType() == NumberType.LONG) {
return (p.getLongValue() == 0L) ? Boolean.FALSE : Boolean.TRUE;
}
// no really good logic; let's actually resort to textual comparison
String str = p.getText();
if ("0.0".equals(str) || "0".equals(str)) {
return Boolean.FALSE;
}
return Boolean.TRUE;
}
// // More helper methods from StdDeserializer
protected void _failDoubleToIntCoercion(JsonParser p, DeserializationContext ctxt,
String type) throws IOException
{
throw ctxt.mappingException("Can not coerce a floating-point value ('%s') into %s; enable `DeserializationFeature.ACCEPT_FLOAT_AS_INT` to allow",
p.getValueAsString(), type);
}
protected boolean _hasTextualNull(String value) {
return "null".equals(value);
}
/**
* Helper method used to check whether given serializer is the default
* serializer implementation: this is necessary to avoid overriding other
* kinds of deserializers.
*/
protected boolean _isDefaultDeserializer(JsonDeserializer deser) {
return (deser == null) || ClassUtil.isJacksonStdImpl(deser);
}
}
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