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The JSON/Java Binding API is designed to bind JSON documents to Java objects. More specifically,
the JSON/Java Binding API provides a way for JSON objects whose structure is expressed in the
JSON Schema Definition Language to be parsed and marshaled, to and from Java objects of
strongly-typed classes. The JSON/Java Binding API can also be used to validate JSON documents as
they are parsed from text or marshaled from Java objects against a JSD. Thus, the JSON/Java
Binding API is a reference implementation of the validation and binding functionalities of the
JSON Schema Definition Language.
/* Copyright (c) 2018 Jsonx
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* You should have received a copy of The MIT License (MIT) along with this
* program. If not, see onPropertyDecode) throws IOException {
return !"{".equals(token) ? null : ObjectCodec.decodeObject(type, reader, onPropertyDecode);
}
static Object decodeObject(final Class type, final JsonReader reader, final TriPredicate onPropertyDecode) throws IOException {
final int index = reader.getIndex();
try {
final JxObject object = type.getConstructor().newInstance();
for (String token; !"}".equals(token = reader.readToken());) {
if (",".equals(token))
token = reader.readToken();
if (!":".equals(reader.readToken()))
throw new IllegalStateException("Should have been caught by JsonReader: " + token);
final String propertyName = token.substring(1, token.length() - 1);
token = reader.readToken();
final Codec codec = getPropertyCodec(object).get(propertyName);
if (codec == null) {
if (onPropertyDecode != null && onPropertyDecode.test(object, propertyName, token))
continue;
return abort(Error.UNKNOWN_PROPERTY(propertyName, reader.getPosition()), reader, index);
}
final Object value;
if ("null".equals(token)) {
final Error error = codec.validateUse(null);
if (error != null)
return abort(error, reader, index);
value = codec.toNull();
}
else if (codec instanceof PrimitiveCodec) {
final PrimitiveCodec primitiveCodec = (PrimitiveCodec)codec;
final Error error = primitiveCodec.matches(token, reader.getPosition());
if (error != null)
return abort(error, reader, index);
value = primitiveCodec.parse(token);
}
else {
if (codec instanceof AnyCodec) {
final AnyCodec anyCodec = (AnyCodec)codec;
value = AnyCodec.decode(anyCodec.property, token, reader, null);
if (value instanceof Error)
return abort((Error)value, reader, index);
}
else {
final char firstChar = token.charAt(0);
if (codec instanceof ObjectCodec) {
if (firstChar != '{')
return abort(Error.EXPECTED_TOKEN(codec.name, codec.elementName(), token, reader.getPosition()), reader, index);
final ObjectCodec objectCodec = (ObjectCodec)codec;
value = decodeObject(objectCodec.type, reader, null);
if (value instanceof Error)
return abort((Error)value, reader, index);
}
else if (codec instanceof ArrayCodec) {
if (firstChar != '[')
return abort(Error.EXPECTED_TOKEN(codec.name, codec.elementName(), token, reader.getPosition()), reader, index);
final ArrayCodec arrayCodec = (ArrayCodec)codec;
value = ArrayCodec.decodeObject(arrayCodec.annotations, arrayCodec.idToElement.getMinIterate(), arrayCodec.idToElement.getMaxIterate(), arrayCodec.idToElement, reader, onPropertyDecode);
if (value instanceof Error)
return abort((Error)value, reader, index);
}
else {
throw new UnsupportedOperationException("Unsupported " + Codec.class.getSimpleName() + " type: " + codec.getClass().getName());
}
}
}
if (value != null)
codec.set(object, propertyName, value, onPropertyDecode);
}
for (final Field field : Classes.getDeclaredFieldsDeep(object.getClass())) {
field.setAccessible(true);
if (field.get(object) == null) {
final Codec codec = getPropertyCodec(object).fieldToCodec.get(field);
if (codec == null)
throw new IllegalStateException("Missing codec for field : " + type.getName() + "#" + field.getName());
final Error error = codec.validateUse(null);
if (error != null)
return abort(error, reader, index);
}
}
return object;
}
catch (final IllegalAccessException | InstantiationException | InvocationTargetException | NoSuchMethodException e) {
throw new IllegalStateException(e);
}
}
private static Error abort(final Error error, final JsonReader reader, final int index) {
reader.setIndex(index);
return error;
}
static Error encodeArray(final Annotation annotation, final Object object, final int index, final Relations relations) {
if (!(object instanceof JxObject))
return Error.CONTENT_NOT_EXPECTED(object, -1);
relations.set(index, new Relation(object, annotation));
return null;
}
private static final Map,PropertyToCodec> typeToCodecs = new HashMap<>();
private static PropertyToCodec getPropertyCodec(final JxObject object) {
final Class cls = object.getClass();
PropertyToCodec propertyToCodec = typeToCodecs.get(cls);
if (propertyToCodec != null)
return propertyToCodec;
propertyToCodec = new PropertyToCodec();
for (final Field field : Classes.getDeclaredFieldsDeep(cls)) {
for (final Annotation annotation : field.getAnnotations()) {
if (annotation instanceof AnyProperty)
propertyToCodec.add(new AnyCodec((AnyProperty)annotation, field));
else if (annotation instanceof ArrayProperty)
propertyToCodec.add(new ArrayCodec((ArrayProperty)annotation, field));
else if (annotation instanceof BooleanProperty)
propertyToCodec.add(new BooleanCodec((BooleanProperty)annotation, field));
else if (annotation instanceof NumberProperty)
propertyToCodec.add(new NumberCodec((NumberProperty)annotation, field));
else if (annotation instanceof ObjectProperty)
propertyToCodec.add(new ObjectCodec((ObjectProperty)annotation, field));
else if (annotation instanceof StringProperty)
propertyToCodec.add(new StringCodec((StringProperty)annotation, field));
else
continue;
break;
}
}
typeToCodecs.put(cls, propertyToCodec);
return propertyToCodec;
}
private final Class type;
@SuppressWarnings("unchecked")
ObjectCodec(final ObjectProperty property, final Field field) {
super(field, property.name(), property.nullable(), property.use());
this.type = (Class)(optional ? Classes.getGenericClasses(field)[0] : field.getType());
}
@Override
String elementName() {
return "object";
}
}