org.codehaus.jackson.map.deser.StdDeserializer Maven / Gradle / Ivy
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Data Mapper package is a high-performance data binding package
built on Jackson JSON processor
package org.codehaus.jackson.map.deser;
import java.io.IOException;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.*;
import org.codehaus.jackson.JsonProcessingException;
import org.codehaus.jackson.JsonParser;
import org.codehaus.jackson.JsonToken;
import org.codehaus.jackson.map.DeserializationConfig;
import org.codehaus.jackson.map.DeserializationContext;
import org.codehaus.jackson.map.JsonDeserializer;
import org.codehaus.jackson.map.JsonMappingException;
/**
* Base class for simple standard deserializers
*/
public abstract class StdDeserializer
extends JsonDeserializer
{
final Class _valueClass;
protected StdDeserializer(Class vc) {
_valueClass = vc;
}
public Class getValueClass() { return _valueClass; }
/*
/////////////////////////////////////////////////////////////
// Helper methods for sub-classes
/////////////////////////////////////////////////////////////
*/
protected final boolean _parseBoolean(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
JsonToken t = jp.getCurrentToken();
if (t == JsonToken.VALUE_TRUE) {
return true;
}
if (t == JsonToken.VALUE_FALSE) {
return false;
}
// [JACKSON-78]: should accept ints too, (0 == false, otherwise true)
if (t == JsonToken.VALUE_NUMBER_INT) {
return (jp.getIntValue() == 0) ? Boolean.FALSE : Boolean.TRUE;
}
// And finally, let's allow Strings to be converted too
if (t == JsonToken.VALUE_STRING) {
String text = jp.getText().trim();
if ("true".equals(text)) {
return Boolean.TRUE;
}
if ("false".equals(text)) {
return Boolean.FALSE;
}
throw ctxt.weirdStringException(_valueClass, "only \"true\" or \"false\" recognized");
}
if (t == JsonToken.VALUE_NULL) {
return Boolean.FALSE;
}
// Otherwise, no can do:
throw ctxt.mappingException(_valueClass);
}
protected final short _parseShort(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
int value = _parseInt(jp, ctxt);
// So far so good: but does it fit?
if (value < Short.MIN_VALUE || value > Short.MAX_VALUE) {
throw ctxt.weirdStringException(_valueClass, "overflow, value can not be represented as 16-bit value");
}
return (short) value;
}
protected final int _parseInt(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
JsonToken t = jp.getCurrentToken();
// Int works as is, coercing fine as well
if (t == JsonToken.VALUE_NUMBER_INT || t == JsonToken.VALUE_NUMBER_FLOAT) { // coercing should work too
return jp.getIntValue();
}
if (t == JsonToken.VALUE_STRING) { // let's do implicit re-parse
// !!! 05-Jan-2009, tatu: Should we try to limit value space, JDK is too lenient?
String text = jp.getText().trim();
try {
return Integer.parseInt(text);
} catch (IllegalArgumentException iae) {
throw ctxt.weirdStringException(_valueClass, "not a valid representation of integral number value");
}
}
if (t == JsonToken.VALUE_NULL) {
return 0;
}
// Otherwise, no can do:
throw ctxt.mappingException(_valueClass);
}
protected final long _parseLong(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
JsonToken t = jp.getCurrentToken();
// it should be ok to coerce (although may fail, too)
if (t == JsonToken.VALUE_NUMBER_INT || t == JsonToken.VALUE_NUMBER_FLOAT) {
return jp.getLongValue();
}
// let's allow Strings to be converted too
if (t == JsonToken.VALUE_STRING) {
// !!! 05-Jan-2009, tatu: Should we try to limit value space, JDK is too lenient?
String text = jp.getText().trim();
try {
return Long.parseLong(text);
} catch (IllegalArgumentException iae) { }
throw ctxt.weirdStringException(_valueClass, "not a valid long value");
}
// Otherwise, no can do:
throw ctxt.mappingException(_valueClass);
}
protected final float _parseFloat(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
// We accept couple of different types; obvious ones first:
JsonToken t = jp.getCurrentToken();
if (t == JsonToken.VALUE_NUMBER_INT || t == JsonToken.VALUE_NUMBER_FLOAT) { // coercing should work too
return jp.getFloatValue();
}
// And finally, let's allow Strings to be converted too
if (t == JsonToken.VALUE_STRING) {
// !!! 05-Jan-2009, tatu: Should we try to limit value space, JDK is too lenient?
String text = jp.getText().trim();
if (text.length() > 1) {
switch (text.charAt(0)) {
case 'I':
if ("Infinity".equals(text) || "INF".equals(text)) {
return Float.POSITIVE_INFINITY;
}
break;
case 'N':
if ("NaN".equals(text)) {
return Float.NaN;
}
break;
case '-':
if ("-Infinity".equals(text) || "-INF".equals(text)) {
return Float.NEGATIVE_INFINITY;
}
break;
}
}
try {
return Float.parseFloat(text);
} catch (IllegalArgumentException iae) { }
throw ctxt.weirdStringException(_valueClass, "not a valid double value");
}
if (t == JsonToken.VALUE_NULL) {
return 0.0f;
}
// Otherwise, no can do:
throw ctxt.mappingException(_valueClass);
}
protected final double _parseDouble(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
// We accept couple of different types; obvious ones first:
JsonToken t = jp.getCurrentToken();
if (t == JsonToken.VALUE_NUMBER_INT || t == JsonToken.VALUE_NUMBER_FLOAT) { // coercing should work too
return jp.getDoubleValue();
}
// And finally, let's allow Strings to be converted too
if (t == JsonToken.VALUE_STRING) {
String text = jp.getText().trim();
if (text.length() > 1) {
switch (text.charAt(0)) {
case 'I':
if ("Infinity".equals(text) || "INF".equals(text)) {
return Double.POSITIVE_INFINITY;
}
break;
case 'N':
if ("NaN".equals(text)) {
return Double.NaN;
}
break;
case '-':
if ("-Infinity".equals(text) || "-INF".equals(text)) {
return Double.NEGATIVE_INFINITY;
}
break;
}
}
try {
return Double.parseDouble(text);
} catch (IllegalArgumentException iae) { }
throw ctxt.weirdStringException(_valueClass, "not a valid double value");
}
if (t == JsonToken.VALUE_NULL) {
return 0.0;
}
// Otherwise, no can do:
throw ctxt.mappingException(_valueClass);
}
protected java.util.Date _parseDate(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
JsonToken t = jp.getCurrentToken();
try {
if (t == JsonToken.VALUE_NUMBER_INT) {
return new java.util.Date(jp.getLongValue());
}
if (t == JsonToken.VALUE_STRING) {
return ctxt.parseDate(jp.getText());
}
throw ctxt.mappingException(_valueClass);
} catch (IllegalArgumentException iae) {
throw ctxt.weirdStringException(_valueClass, "not a valid representation (error: "+iae.getMessage()+")");
}
}
/*
/////////////////////////////////////////////////////////////
// Then one intermediate base class for things that have
// both primitive and wrapper types
/////////////////////////////////////////////////////////////
*/
protected abstract static class PrimitiveOrWrapperDeserializer
extends StdDeserializer
{
final T _nullValue;
protected PrimitiveOrWrapperDeserializer(Class vc, T nvl)
{
super(vc);
_nullValue = nvl;
}
public final T getNullValue() { return _nullValue; }
}
/*
/////////////////////////////////////////////////////////////
// First, generic (Object, String, String-like, Class) deserializers
/////////////////////////////////////////////////////////////
*/
public final static class StringDeserializer
extends StdDeserializer
{
public StringDeserializer() { super(String.class); }
@Override
public String deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
JsonToken curr = jp.getCurrentToken();
// Usually should just get string value:
if (curr == JsonToken.VALUE_STRING) {
return jp.getText();
}
// Can deserialize any scaler value, but not markers
if (curr.isScalarValue()) {
return jp.getText();
}
throw ctxt.mappingException(_valueClass);
}
}
public final static class ClassDeserializer
extends StdDeserializer>
{
public ClassDeserializer() { super(Class.class); }
@Override
public Class deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
JsonToken curr = jp.getCurrentToken();
// Currently will only accept if given simple class name
if (curr == JsonToken.VALUE_STRING) {
try {
return Class.forName(jp.getText());
} catch (ClassNotFoundException e) {
throw ctxt.instantiationException(_valueClass, e);
}
}
throw ctxt.mappingException(_valueClass);
}
}
/*
/////////////////////////////////////////////////////////////
// Then primitive/wrapper types
/////////////////////////////////////////////////////////////
*/
public final static class BooleanDeserializer
extends PrimitiveOrWrapperDeserializer
{
public BooleanDeserializer(Class cls, Boolean nvl)
{
super(cls, nvl);
}
@Override
public Boolean deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
return _parseBoolean(jp, ctxt) ? Boolean.TRUE : Boolean.FALSE;
}
}
public final static class ByteDeserializer
extends PrimitiveOrWrapperDeserializer
{
public ByteDeserializer(Class cls, Byte nvl)
{
super(cls, nvl);
}
@Override
public Byte deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
int value = _parseInt(jp, ctxt);
// So far so good: but does it fit?
if (value < Byte.MIN_VALUE || value > Byte.MAX_VALUE) {
throw ctxt.weirdStringException(_valueClass, "overflow, value can not be represented as 8-bit value");
}
return Byte.valueOf((byte) value);
}
}
public final static class ShortDeserializer
extends PrimitiveOrWrapperDeserializer
{
public ShortDeserializer(Class cls, Short nvl)
{
super(cls, nvl);
}
@Override
public Short deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
return Short.valueOf(_parseShort(jp, ctxt));
}
}
public final static class CharacterDeserializer
extends PrimitiveOrWrapperDeserializer
{
public CharacterDeserializer(Class cls, Character nvl)
{
super(cls, nvl);
}
@Override
public Character deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
JsonToken t = jp.getCurrentToken();
int value;
if (t == JsonToken.VALUE_NUMBER_INT) { // ok iff ascii value
value = jp.getIntValue();
if (value >= 0 && value <= 0xFFFF) {
return Character.valueOf((char) value);
}
} else if (t == JsonToken.VALUE_STRING) { // this is the usual type
// But does it have to be exactly one char?
String text = jp.getText();
if (text.length() == 1) {
return Character.valueOf(text.charAt(0));
}
}
throw ctxt.mappingException(_valueClass);
}
}
public final static class IntegerDeserializer
extends PrimitiveOrWrapperDeserializer
{
public IntegerDeserializer(Class cls, Integer nvl)
{
super(cls, nvl);
}
@Override
public Integer deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
return _parseInt(jp, ctxt);
}
}
public final static class LongDeserializer
extends PrimitiveOrWrapperDeserializer
{
public LongDeserializer(Class cls, Long nvl)
{
super(cls, nvl);
}
@Override
public Long deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
return Long.valueOf(_parseLong(jp, ctxt));
}
}
public final static class FloatDeserializer
extends PrimitiveOrWrapperDeserializer
{
public FloatDeserializer(Class cls, Float nvl)
{
super(cls, nvl);
}
@Override
public Float deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
/* 22-Jan-2009, tatu: Bounds/range checks would be tricky
* here, so let's not bother even trying...
*/
return Float.valueOf((float) _parseDouble(jp, ctxt));
}
}
public final static class DoubleDeserializer
extends PrimitiveOrWrapperDeserializer
{
public DoubleDeserializer(Class cls, Double nvl)
{
super(cls, nvl);
}
@Override
public Double deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
return _parseDouble(jp, ctxt);
}
}
/**
* For type Number.class, we can just rely on type
* mappings that plain {@link JsonParser#getNumberValue} returns.
*/
public final static class NumberDeserializer
extends StdDeserializer
{
public NumberDeserializer() { super(Number.class); }
@Override
public Number deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
JsonToken t = jp.getCurrentToken();
if (t == JsonToken.VALUE_NUMBER_INT) {
if (ctxt.isEnabled(DeserializationConfig.Feature.USE_BIG_INTEGER_FOR_INTS)) {
return jp.getBigIntegerValue();
}
return jp.getNumberValue();
} else if (t == JsonToken.VALUE_NUMBER_FLOAT) {
/* [JACKSON-72]: need to allow overriding the behavior
* regarding which type to use
*/
if (ctxt.isEnabled(DeserializationConfig.Feature.USE_BIG_DECIMAL_FOR_FLOATS)) {
return jp.getDecimalValue();
}
return Double.valueOf(jp.getDoubleValue());
}
/* Textual values are more difficult... not parsing itself, but figuring
* out 'minimal' type to use
*/
if (t == JsonToken.VALUE_STRING) { // let's do implicit re-parse
String text = jp.getText().trim();
try {
if (text.indexOf('.') >= 0) { // floating point
// as per [JACKSON-72]:
if (ctxt.isEnabled(DeserializationConfig.Feature.USE_BIG_DECIMAL_FOR_FLOATS)) {
return new BigDecimal(text);
}
return new Double(text);
}
// as per [JACKSON-100]:
if (ctxt.isEnabled(DeserializationConfig.Feature.USE_BIG_INTEGER_FOR_INTS)) {
return new BigInteger(text);
}
long value = Long.parseLong(text);
if (value <= Integer.MAX_VALUE && value >= Integer.MIN_VALUE) {
return Integer.valueOf((int) value);
}
return Long.valueOf(value);
} catch (IllegalArgumentException iae) {
throw ctxt.weirdStringException(_valueClass, "not a valid number");
}
}
// Otherwise, no can do:
throw ctxt.mappingException(_valueClass);
}
}
/*
/////////////////////////////////////////////////////////////
// And then bit more complicated (but non-structured) number
// types
/////////////////////////////////////////////////////////////
*/
public static class BigDecimalDeserializer
extends StdDeserializer
{
public BigDecimalDeserializer() { super(BigDecimal.class); }
@Override
public BigDecimal deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
JsonToken t = jp.getCurrentToken();
if (t == JsonToken.VALUE_NUMBER_INT
|| t == JsonToken.VALUE_NUMBER_FLOAT) {
return jp.getDecimalValue();
}
// String is ok too, can easily convert
if (t == JsonToken.VALUE_STRING) { // let's do implicit re-parse
String text = jp.getText().trim();
try {
return new BigDecimal(text);
} catch (IllegalArgumentException iae) {
throw ctxt.weirdStringException(_valueClass, "not a valid representation");
}
}
// Otherwise, no can do:
throw ctxt.mappingException(_valueClass);
}
}
/**
* This is bit trickier to implement efficiently, while avoiding
* overflow problems.
*/
public static class BigIntegerDeserializer
extends StdDeserializer
{
public BigIntegerDeserializer() { super(BigInteger.class); }
@Override
public BigInteger deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
JsonToken t = jp.getCurrentToken();
String text;
if (t == JsonToken.VALUE_NUMBER_INT) {
switch (jp.getNumberType()) {
case INT:
case LONG:
return BigInteger.valueOf(jp.getLongValue());
}
} else if (t == JsonToken.VALUE_NUMBER_FLOAT) {
/* Whether to fail if there's non-integer part?
* Could do by calling BigDecimal.toBigIntegerExact()
*/
return jp.getDecimalValue().toBigInteger();
} else if (t != JsonToken.VALUE_STRING) { // let's do implicit re-parse
// String is ok too, can easily convert; otherwise, no can do:
throw ctxt.mappingException(_valueClass);
}
text = jp.getText().trim();
try {
return new BigInteger(text);
} catch (IllegalArgumentException iae) {
throw ctxt.weirdStringException(_valueClass, "not a valid representation");
}
}
}
/*
/////////////////////////////////////////////////////////////
// Then trickier things: Date/Calendar types
/////////////////////////////////////////////////////////////
*/
public static class CalendarDeserializer
extends StdDeserializer
{
public CalendarDeserializer() { super(Calendar.class); }
@Override
public Calendar deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
return ctxt.constructCalendar(_parseDate(jp, ctxt));
}
}
/**
* Compared to plain old {@link java.util.Date}, SQL version is easier
* to deal with: mostly because it is more limited.
*/
public static class SqlDateDeserializer
extends StdDeserializer
{
public SqlDateDeserializer() { super(java.sql.Date.class); }
@Override
public java.sql.Date deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
JsonToken t = jp.getCurrentToken();
try {
if (t == JsonToken.VALUE_NUMBER_INT) {
return new java.sql.Date(jp.getLongValue());
}
if (t == JsonToken.VALUE_STRING) {
return java.sql.Date.valueOf(jp.getText().trim());
}
throw ctxt.mappingException(_valueClass);
} catch (IllegalArgumentException iae) {
throw ctxt.weirdStringException(_valueClass, "not a valid representation (error: "+iae.getMessage()+")");
}
}
}
/*
/////////////////////////////////////////////////////////////
// And other oddities
/////////////////////////////////////////////////////////////
*/
public static class StackTraceElementDeserializer
extends StdDeserializer
{
public StackTraceElementDeserializer() { super(StackTraceElement.class); }
@Override
public StackTraceElement deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
JsonToken t = jp.getCurrentToken();
// Must get an Object
if (t == JsonToken.START_OBJECT) {
String className = "", methodName = "", fileName = "";
int lineNumber = -1;
while ((t = jp.nextValue()) != JsonToken.END_OBJECT) {
String propName = jp.getCurrentName();
if ("className".equals(propName)) {
className = jp.getText();
} else if ("fileName".equals(propName)) {
fileName = jp.getText();
} else if ("lineNumber".equals(propName)) {
if (t.isNumeric()) {
lineNumber = jp.getIntValue();
} else {
throw JsonMappingException.from(jp, "Non-numeric token ("+t+") for property 'lineNumber'");
}
} else if ("methodName".equals(propName)) {
methodName = jp.getText();
} else if ("nativeMethod".equals(propName)) {
// no setter, not passed via constructor: ignore
} else {
ctxt.unknownFieldException(_valueClass, propName);
}
}
return new StackTraceElement(className, methodName, fileName, lineNumber);
}
throw ctxt.mappingException(_valueClass);
}
}
}
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