org.codehaus.jackson.map.deser.StdKeyDeserializer 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.lang.reflect.Constructor;
import java.lang.reflect.Method;
import org.codehaus.jackson.JsonProcessingException;
import org.codehaus.jackson.map.*;
/**
* Base class for simple key deserializers.
*/
public abstract class StdKeyDeserializer
extends KeyDeserializer
{
final protected Class _keyClass;
protected StdKeyDeserializer(Class cls) { _keyClass = cls; }
@Override
public final Object deserializeKey(String key, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
if (key == null) { // is this even legal call?
return null;
}
try {
Object result = _parse(key, ctxt);
if (result != null) {
return result;
}
} catch (Exception re) {
throw ctxt.weirdKeyException(_keyClass, key, "not a valid representation: "+re.getMessage());
}
throw ctxt.weirdKeyException(_keyClass, key, "not a valid representation");
}
public Class getKeyClass() { return _keyClass; }
protected abstract Object _parse(String key, DeserializationContext ctxt) throws Exception;
/*
/**********************************************************
/* Helper methods for sub-classes
/**********************************************************
*/
protected int _parseInt(String key) throws IllegalArgumentException
{
return Integer.parseInt(key);
}
protected long _parseLong(String key) throws IllegalArgumentException
{
return Long.parseLong(key);
}
protected double _parseDouble(String key) throws IllegalArgumentException
{
return Double.parseDouble(key);
}
/*
/**********************************************************
/* Key deserializer implementations; wrappers
/**********************************************************
*/
final static class BoolKD extends StdKeyDeserializer
{
BoolKD() { super(Boolean.class); }
@Override
public Boolean _parse(String key, DeserializationContext ctxt) throws JsonMappingException
{
if ("true".equals(key)) {
return Boolean.TRUE;
}
if ("false".equals(key)) {
return Boolean.FALSE;
}
throw ctxt.weirdKeyException(_keyClass, key, "value not 'true' or 'false'");
}
}
final static class ByteKD extends StdKeyDeserializer
{
ByteKD() { super(Byte.class); }
@Override
public Byte _parse(String key, DeserializationContext ctxt) throws JsonMappingException
{
int value = _parseInt(key);
if (value < Byte.MIN_VALUE || value > Byte.MAX_VALUE) {
throw ctxt.weirdKeyException(_keyClass, key, "overflow, value can not be represented as 8-bit value");
}
return Byte.valueOf((byte) value);
}
}
final static class ShortKD extends StdKeyDeserializer
{
ShortKD() { super(Integer.class); }
@Override
public Short _parse(String key, DeserializationContext ctxt) throws JsonMappingException
{
int value = _parseInt(key);
if (value < Short.MIN_VALUE || value > Short.MAX_VALUE) {
throw ctxt.weirdKeyException(_keyClass, key, "overflow, value can not be represented as 16-bit value");
}
return Short.valueOf((short) value);
}
}
/**
* Dealing with Characters is bit trickier: let's assume it must be a String, and that
* Unicode numeric value is never used.
*/
final static class CharKD extends StdKeyDeserializer
{
CharKD() { super(Character.class); }
@Override
public Character _parse(String key, DeserializationContext ctxt) throws JsonMappingException
{
if (key.length() == 1) {
return Character.valueOf(key.charAt(0));
}
throw ctxt.weirdKeyException(_keyClass, key, "can only convert 1-character Strings");
}
}
final static class IntKD extends StdKeyDeserializer
{
IntKD() { super(Integer.class); }
@Override
public Integer _parse(String key, DeserializationContext ctxt) throws JsonMappingException
{
return _parseInt(key);
}
}
final static class LongKD extends StdKeyDeserializer
{
LongKD() { super(Long.class); }
@Override
public Long _parse(String key, DeserializationContext ctxt) throws JsonMappingException
{
return _parseLong(key);
}
}
final static class DoubleKD extends StdKeyDeserializer
{
DoubleKD() { super(Double.class); }
@Override
public Double _parse(String key, DeserializationContext ctxt) throws JsonMappingException
{
return _parseDouble(key);
}
}
final static class FloatKD extends StdKeyDeserializer
{
FloatKD() { super(Float.class); }
@Override
public Float _parse(String key, DeserializationContext ctxt) throws JsonMappingException
{
/* 22-Jan-2009, tatu: Bounds/range checks would be tricky
* here, so let's not bother even trying...
*/
return Float.valueOf((float) _parseDouble(key));
}
}
/*
/**********************************************************
/* Key deserializer implementations; other
/**********************************************************
*/
final static class EnumKD extends StdKeyDeserializer
{
final EnumResolver _resolver;
EnumKD(EnumResolver er)
{
super(er.getEnumClass());
_resolver = er;
}
@Override
public Enum _parse(String key, DeserializationContext ctxt) throws JsonMappingException
{
Enum e = _resolver.findEnum(key);
if (e == null) {
throw ctxt.weirdKeyException(_keyClass, key, "not one of values for Enum class");
}
return e;
}
}
/**
* Key deserializer that calls a single-string-arg constructor
* to instantiate desired key type.
*/
final static class StringCtorKeyDeserializer extends StdKeyDeserializer
{
final Constructor _ctor;
public StringCtorKeyDeserializer(Constructor ctor) {
super(ctor.getDeclaringClass());
_ctor = ctor;
}
@Override
public Object _parse(String key, DeserializationContext ctxt) throws Exception
{
return _ctor.newInstance(key);
}
}
/**
* Key deserializer that calls a static no-args factory method
* to instantiate desired key type.
*/
final static class StringFactoryKeyDeserializer extends StdKeyDeserializer
{
final Method _factoryMethod;
public StringFactoryKeyDeserializer(Method fm) {
super(fm.getDeclaringClass());
_factoryMethod = fm;
}
@Override
public Object _parse(String key, DeserializationContext ctxt) throws Exception
{
return _factoryMethod.invoke(null, key);
}
}
}