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com.fasterxml.jackson.databind.deser.std.StdKeyDeserializer Maven / Gradle / Ivy
package com.fasterxml.jackson.databind.deser.std;
import java.io.IOException;
import java.io.Serializable;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.util.*;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.io.NumberInput;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.annotation.JacksonStdImpl;
import com.fasterxml.jackson.databind.introspect.AnnotatedMethod;
import com.fasterxml.jackson.databind.util.ClassUtil;
import com.fasterxml.jackson.databind.util.EnumResolver;
import com.fasterxml.jackson.databind.util.TokenBuffer;
/**
* Default {@link KeyDeserializer} implementation used for most {@link java.util.Map}
* types Jackson supports.
* Implemented as "chameleon" (or swiss pocket knife) class; not particularly elegant,
* but helps reduce number of classes and jar size (class metadata adds significant
* per-class overhead; much more than bytecode).
*/
@JacksonStdImpl
public class StdKeyDeserializer extends KeyDeserializer
implements java.io.Serializable
{
private static final long serialVersionUID = 1L;
public final static int TYPE_BOOLEAN = 1;
public final static int TYPE_BYTE = 2;
public final static int TYPE_SHORT = 3;
public final static int TYPE_CHAR = 4;
public final static int TYPE_INT = 5;
public final static int TYPE_LONG = 6;
public final static int TYPE_FLOAT = 7;
public final static int TYPE_DOUBLE = 8;
public final static int TYPE_LOCALE = 9;
public final static int TYPE_DATE = 10;
public final static int TYPE_CALENDAR = 11;
public final static int TYPE_UUID = 12;
public final static int TYPE_URI = 13;
public final static int TYPE_URL = 14;
public final static int TYPE_CLASS = 15;
public final static int TYPE_CURRENCY = 16;
public final static int TYPE_BYTE_ARRAY = 17; // since 2.9
final protected int _kind;
final protected Class _keyClass;
/**
* Some types that are deserialized using a helper deserializer.
*/
protected final FromStringDeserializer _deser;
protected StdKeyDeserializer(int kind, Class cls) {
this(kind, cls, null);
}
protected StdKeyDeserializer(int kind, Class cls, FromStringDeserializer deser) {
_kind = kind;
_keyClass = cls;
_deser = deser;
}
public static StdKeyDeserializer forType(Class raw)
{
int kind;
// first common types:
if (raw == String.class || raw == Object.class
|| raw == CharSequence.class
// see [databind#2115]:
|| raw == Serializable.class) {
return StringKD.forType(raw);
}
if (raw == UUID.class) {
kind = TYPE_UUID;
} else if (raw == Integer.class) {
kind = TYPE_INT;
} else if (raw == Long.class) {
kind = TYPE_LONG;
} else if (raw == Date.class) {
kind = TYPE_DATE;
} else if (raw == Calendar.class) {
kind = TYPE_CALENDAR;
// then less common ones...
} else if (raw == Boolean.class) {
kind = TYPE_BOOLEAN;
} else if (raw == Byte.class) {
kind = TYPE_BYTE;
} else if (raw == Character.class) {
kind = TYPE_CHAR;
} else if (raw == Short.class) {
kind = TYPE_SHORT;
} else if (raw == Float.class) {
kind = TYPE_FLOAT;
} else if (raw == Double.class) {
kind = TYPE_DOUBLE;
} else if (raw == URI.class) {
kind = TYPE_URI;
} else if (raw == URL.class) {
kind = TYPE_URL;
} else if (raw == Class.class) {
kind = TYPE_CLASS;
} else if (raw == Locale.class) {
FromStringDeserializer deser = FromStringDeserializer.findDeserializer(Locale.class);
return new StdKeyDeserializer(TYPE_LOCALE, raw, deser);
} else if (raw == Currency.class) {
FromStringDeserializer deser = FromStringDeserializer.findDeserializer(Currency.class);
return new StdKeyDeserializer(TYPE_CURRENCY, raw, deser);
} else if (raw == byte[].class) {
kind = TYPE_BYTE_ARRAY;
} else {
return null;
}
return new StdKeyDeserializer(kind, raw);
}
@Override
public Object deserializeKey(String key, DeserializationContext ctxt)
throws IOException
{
if (key == null) { // is this even legal call?
return null;
}
try {
Object result = _parse(key, ctxt);
if (result != null) {
return result;
}
} catch (Exception re) {
return ctxt.handleWeirdKey(_keyClass, key, "not a valid representation, problem: (%s) %s",
re.getClass().getName(),
ClassUtil.exceptionMessage(re));
}
if (ClassUtil.isEnumType(_keyClass)
&& ctxt.getConfig().isEnabled(DeserializationFeature.READ_UNKNOWN_ENUM_VALUES_AS_NULL)) {
return null;
}
return ctxt.handleWeirdKey(_keyClass, key, "not a valid representation");
}
public Class getKeyClass() { return _keyClass; }
protected Object _parse(String key, DeserializationContext ctxt) throws Exception
{
switch (_kind) {
case TYPE_BOOLEAN:
if ("true".equals(key)) {
return Boolean.TRUE;
}
if ("false".equals(key)) {
return Boolean.FALSE;
}
return ctxt.handleWeirdKey(_keyClass, key, "value not 'true' or 'false'");
case TYPE_BYTE:
{
int value = _parseInt(key);
// allow range up to 255, inclusive (to support "unsigned" byte)
if (value < Byte.MIN_VALUE || value > 255) {
return ctxt.handleWeirdKey(_keyClass, key, "overflow, value cannot be represented as 8-bit value");
}
return Byte.valueOf((byte) value);
}
case TYPE_SHORT:
{
int value = _parseInt(key);
if (value < Short.MIN_VALUE || value > Short.MAX_VALUE) {
return ctxt.handleWeirdKey(_keyClass, key, "overflow, value cannot be represented as 16-bit value");
// fall-through and truncate if need be
}
return Short.valueOf((short) value);
}
case TYPE_CHAR:
if (key.length() == 1) {
return Character.valueOf(key.charAt(0));
}
return ctxt.handleWeirdKey(_keyClass, key, "can only convert 1-character Strings");
case TYPE_INT:
return _parseInt(key);
case TYPE_LONG:
return _parseLong(key);
case TYPE_FLOAT:
// Bounds/range checks would be tricky here, so let's not bother even trying...
return Float.valueOf((float) _parseDouble(key));
case TYPE_DOUBLE:
return _parseDouble(key);
case TYPE_LOCALE:
try {
return _deser._deserialize(key, ctxt);
} catch (IllegalArgumentException e) {
return _weirdKey(ctxt, key, e);
}
case TYPE_CURRENCY:
try {
return _deser._deserialize(key, ctxt);
} catch (IllegalArgumentException e) {
return _weirdKey(ctxt, key, e);
}
case TYPE_DATE:
return ctxt.parseDate(key);
case TYPE_CALENDAR:
return ctxt.constructCalendar(ctxt.parseDate(key));
case TYPE_UUID:
try {
return UUID.fromString(key);
} catch (Exception e) {
return _weirdKey(ctxt, key, e);
}
case TYPE_URI:
try {
return URI.create(key);
} catch (Exception e) {
return _weirdKey(ctxt, key, e);
}
case TYPE_URL:
try {
return new URL(key);
} catch (MalformedURLException e) {
return _weirdKey(ctxt, key, e);
}
case TYPE_CLASS:
try {
return ctxt.findClass(key);
} catch (Exception e) {
return ctxt.handleWeirdKey(_keyClass, key, "unable to parse key as Class");
}
case TYPE_BYTE_ARRAY:
try {
return ctxt.getConfig().getBase64Variant().decode(key);
} catch (IllegalArgumentException e) {
return _weirdKey(ctxt, key, e);
}
default:
throw new IllegalStateException("Internal error: unknown key type "+_keyClass);
}
}
/*
/**********************************************************
/* Helper methods for sub-classes
/**********************************************************
*/
protected int _parseInt(String key) throws IllegalArgumentException {
return NumberInput.parseInt(key);
}
protected long _parseLong(String key) throws IllegalArgumentException {
return NumberInput.parseLong(key);
}
protected double _parseDouble(String key) throws IllegalArgumentException {
return NumberInput.parseDouble(key);
}
// @since 2.9
protected Object _weirdKey(DeserializationContext ctxt, String key, Exception e) throws IOException {
return ctxt.handleWeirdKey(_keyClass, key, "problem: %s",
ClassUtil.exceptionMessage(e));
}
/*
/**********************************************************
/* First: the standard "String as String" deserializer
/**********************************************************
*/
@JacksonStdImpl
final static class StringKD extends StdKeyDeserializer
{
private static final long serialVersionUID = 1L;
private final static StringKD sString = new StringKD(String.class);
private final static StringKD sObject = new StringKD(Object.class);
private StringKD(Class nominalType) { super(-1, nominalType); }
public static StringKD forType(Class nominalType)
{
if (nominalType == String.class) {
return sString;
}
if (nominalType == Object.class) {
return sObject;
}
return new StringKD(nominalType);
}
@Override
public Object deserializeKey(String key, DeserializationContext ctxt) throws IOException {
return key;
}
}
/*
/**********************************************************
/* Key deserializer implementations; other
/**********************************************************
*/
/**
* Key deserializer that wraps a "regular" deserializer (but one
* that must recognize FIELD_NAMEs as text!) to reuse existing
* handlers as key handlers.
*/
final static class DelegatingKD
extends KeyDeserializer // note: NOT the std one
implements java.io.Serializable
{
private static final long serialVersionUID = 1L;
final protected Class _keyClass;
protected final JsonDeserializer _delegate;
protected DelegatingKD(Class cls, JsonDeserializer deser) {
_keyClass = cls;
_delegate = deser;
}
@SuppressWarnings("resource")
@Override
public final Object deserializeKey(String key, DeserializationContext ctxt)
throws IOException
{
if (key == null) { // is this even legal call?
return null;
}
TokenBuffer tb = ctxt.bufferForInputBuffering();
tb.writeString(key);
try {
// Ugh... should not have to give parser which may or may not be correct one...
JsonParser p = tb.asParser();
p.nextToken();
Object result = _delegate.deserialize(p, ctxt);
if (result != null) {
return result;
}
return ctxt.handleWeirdKey(_keyClass, key, "not a valid representation");
} catch (Exception re) {
return ctxt.handleWeirdKey(_keyClass, key, "not a valid representation: %s", re.getMessage());
}
}
public Class getKeyClass() { return _keyClass; }
}
@JacksonStdImpl
final static class EnumKD extends StdKeyDeserializer
{
private static final long serialVersionUID = 1L;
protected final EnumResolver _byNameResolver;
protected final AnnotatedMethod _factory;
/**
* Lazily constructed alternative in case there is need to
* use 'toString()' method as the source.
*
* @since 2.7.3
*/
protected EnumResolver _byToStringResolver;
protected final Enum _enumDefaultValue;
protected EnumKD(EnumResolver er, AnnotatedMethod factory) {
super(-1, er.getEnumClass());
_byNameResolver = er;
_factory = factory;
_enumDefaultValue = er.getDefaultValue();
}
@Override
public Object _parse(String key, DeserializationContext ctxt) throws IOException
{
if (_factory != null) {
try {
return _factory.call1(key);
} catch (Exception e) {
ClassUtil.unwrapAndThrowAsIAE(e);
}
}
EnumResolver res = ctxt.isEnabled(DeserializationFeature.READ_ENUMS_USING_TO_STRING)
? _getToStringResolver(ctxt) : _byNameResolver;
Enum e = res.findEnum(key);
if (e == null) {
if ((_enumDefaultValue != null)
&& ctxt.isEnabled(DeserializationFeature.READ_UNKNOWN_ENUM_VALUES_USING_DEFAULT_VALUE)) {
e = _enumDefaultValue;
} else if (!ctxt.isEnabled(DeserializationFeature.READ_UNKNOWN_ENUM_VALUES_AS_NULL)) {
return ctxt.handleWeirdKey(_keyClass, key, "not one of the values accepted for Enum class: %s",
res.getEnumIds());
}
// fall-through if problems are collected, not immediately thrown
}
return e;
}
private EnumResolver _getToStringResolver(DeserializationContext ctxt)
{
EnumResolver res = _byToStringResolver;
if (res == null) {
synchronized (this) {
res = EnumResolver.constructUsingToString(ctxt.getConfig(),
_byNameResolver.getEnumClass());
_byToStringResolver = res;
}
}
return res;
}
}
/**
* Key deserializer that calls a single-string-arg constructor
* to instantiate desired key type.
*/
final static class StringCtorKeyDeserializer extends StdKeyDeserializer
{
private static final long serialVersionUID = 1L;
protected final Constructor _ctor;
public StringCtorKeyDeserializer(Constructor ctor) {
super(-1, 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
{
private static final long serialVersionUID = 1L;
final Method _factoryMethod;
public StringFactoryKeyDeserializer(Method fm) {
super(-1, fm.getDeclaringClass());
_factoryMethod = fm;
}
@Override
public Object _parse(String key, DeserializationContext ctxt) throws Exception
{
return _factoryMethod.invoke(null, key);
}
}
}
