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DSL Platform compatible Java JSON library (https://dsl-platform.com)
package com.dslplatform.json.runtime;
import com.dslplatform.json.*;
import java.io.IOException;
import java.lang.reflect.*;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Set;
public abstract class ObjectAnalyzer {
private static class LazyObjectDescription implements JsonWriter.WriteObject, JsonReader.ReadObject, JsonReader.BindObject {
private final DslJson json;
private final Type type;
private JsonWriter.WriteObject resolvedWriter;
private JsonReader.BindObject resolvedBinder;
private JsonReader.ReadObject resolvedReader;
volatile ObjectFormatDescription resolved;
LazyObjectDescription(DslJson json, Type type) {
this.json = json;
this.type = type;
}
private boolean checkSignatureNotFound() {
int i = 0;
ObjectFormatDescription local = null;
while (i < 50) {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
throw new SerializationException(e);
}
local = resolved;
if (local != null) {
resolvedWriter = local;
resolvedReader = local;
resolvedBinder = local;
break;
}
i++;
}
return local == null;
}
@Override
public Object read(JsonReader reader) throws IOException {
if (resolvedReader == null) {
if (checkSignatureNotFound()) {
final JsonReader.ReadObject tmp = json.tryFindReader(type);
if (tmp == null || tmp == this) {
throw new SerializationException("Unable to find reader for " + type);
}
resolvedReader = tmp;
}
}
return resolvedReader.read(reader);
}
@Override
public Object bind(final JsonReader reader, final Object instance) throws IOException {
if (resolvedBinder == null) {
if (checkSignatureNotFound()) {
final JsonReader.BindObject tmp = json.tryFindBinder(type);
if (tmp == null || tmp == this) {
throw new SerializationException("Unable to find binder for " + type);
}
resolvedBinder = tmp;
}
}
return resolvedBinder.bind(reader, instance);
}
@Override
public void write(final JsonWriter writer, final Object value) {
if (resolvedWriter == null) {
if (checkSignatureNotFound()) {
final JsonWriter.WriteObject tmp = json.tryFindWriter(type);
if (tmp == null || tmp == this) {
throw new SerializationException("Unable to find writer for " + type);
}
resolvedWriter = tmp;
}
}
resolvedWriter.write(writer, value);
}
}
public static final DslJson.ConverterFactory CONVERTER = new DslJson.ConverterFactory() {
@Override
public ObjectFormatDescription tryCreate(Type manifest, DslJson dslJson) {
if (manifest instanceof Class) {
return analyze(manifest, (Class) manifest, dslJson);
}
if (manifest instanceof ParameterizedType) {
final ParameterizedType pt = (ParameterizedType) manifest;
if (pt.getRawType() instanceof Class) {
return analyze(manifest, (Class) pt.getRawType(), dslJson);
}
}
return null;
}
};
private static ObjectFormatDescription analyze(final Type manifest, final Class raw, final DslJson json) {
if (raw.isArray()
|| Object.class == manifest
|| Collection.class.isAssignableFrom(raw)
|| raw.isInterface()
|| (raw.getModifiers() & Modifier.ABSTRACT) != 0
|| (raw.getDeclaringClass() != null && (raw.getModifiers() & Modifier.STATIC) == 0)) {
return null;
}
final Set currentEncoders = json.getRegisteredEncoders();
final Set currentDecoders = json.getRegisteredDecoders();
final Set currentBinders = json.getRegisteredBinders();
final boolean hasEncoder = currentEncoders.contains(manifest);
final boolean hasDecoder = currentDecoders.contains(manifest);
final boolean hasBinder = currentBinders.contains(manifest);
try {
raw.newInstance();
} catch (InstantiationException | IllegalAccessException ignore) {
return null;
}
final InstanceFactory newInstance = new InstanceFactory() {
@Override
public Object create() {
try {
return raw.newInstance();
} catch (Exception ex) {
throw new SerializationException("Unable to create an instance of " + raw);
}
}
};
final LazyObjectDescription lazy = new LazyObjectDescription(json, manifest);
if (!hasEncoder) json.registerWriter(manifest, lazy);
if (!hasDecoder) json.registerReader(manifest, lazy);
final LinkedHashMap foundWrite = new LinkedHashMap<>();
final LinkedHashMap> foundRead = new LinkedHashMap<>();
final HashMap genericMappings = Generics.analyze(manifest, raw);
int index = 0;
for (final Field f : raw.getFields()) {
if (analyzeField(json, foundWrite, foundRead, f, index, genericMappings)) index++;
}
for (final Method m : raw.getMethods()) {
if (analyzeMethods(m, raw, json, foundWrite, foundRead, index, genericMappings)) index++;
}
//TODO: don't register bean if something can't be serialized
final JsonWriter.WriteObject[] writeProps = foundWrite.values().toArray(new JsonWriter.WriteObject[0]);
final DecodePropertyInfo[] readProps = foundRead.values().toArray(new DecodePropertyInfo[0]);
final ObjectFormatDescription converter = ObjectFormatDescription.create(raw, newInstance, writeProps, readProps, json, true);
if (!hasEncoder) json.registerWriter(manifest, converter);
if (!hasDecoder) json.registerReader(manifest, converter);
if (!hasBinder) json.registerBinder(manifest, converter);
lazy.resolved = converter;
return converter;
}
private static boolean analyzeField(
final DslJson json,
final LinkedHashMap foundWrite,
final LinkedHashMap> foundRead,
final Field field,
final int index,
final HashMap genericMappings) {
if (!canRead(field.getModifiers()) || !canWrite(field.getModifiers())) return false;
final Type type = field.getGenericType();
final Type concreteType = Generics.makeConcrete(type, genericMappings);
final boolean isUnknown = Generics.isUnknownType(type);
if (isUnknown || json.tryFindWriter(concreteType) != null && json.tryFindReader(concreteType) != null) {
foundWrite.put(
field.getName(),
Settings.createEncoder(
new Reflection.ReadField(field),
field.getName(),
json,
isUnknown ? null : concreteType));
foundRead.put(
field.getName(),
Settings.createDecoder(
new Reflection.SetField(field),
field.getName(),
json,
false,
false,
index,
false,
concreteType));
return true;
}
return false;
}
private static boolean analyzeMethods(
final Method mget,
final Class manifest,
final DslJson json,
final LinkedHashMap foundWrite,
final LinkedHashMap> foundRead,
final int index,
final HashMap genericMappings) {
if (mget.getParameterTypes().length != 0) return false;
final String setName = mget.getName().startsWith("get") ? "set" + mget.getName().substring(3) : mget.getName();
final Method mset;
try {
mset = manifest.getMethod(setName, mget.getReturnType());
} catch (NoSuchMethodException ignore) {
return false;
}
final String name = mget.getName().startsWith("get") && mget.getName().length() > 3
? Character.toLowerCase(mget.getName().charAt(3)) + mget.getName().substring(4)
: mget.getName();
if (!canRead(mget.getModifiers()) || !canWrite(mset.getModifiers())) return false;
if (foundRead.containsKey(name) && foundWrite.containsKey(name)) return false;
final Type type = mget.getGenericReturnType();
final Type concreteType = Generics.makeConcrete(type, genericMappings);
final boolean isUnknown = Generics.isUnknownType(type);
if (isUnknown || json.tryFindWriter(concreteType) != null && json.tryFindReader(concreteType) != null) {
foundWrite.put(
name,
Settings.createEncoder(
new Reflection.ReadMethod(mget),
name,
json,
isUnknown ? null : concreteType));
foundRead.put(
name,
Settings.createDecoder(
new Reflection.SetMethod(mset),
name,
json,
false,
false,
index,
false,
concreteType));
return true;
}
return false;
}
private static boolean canRead(final int modifiers) {
return (modifiers & Modifier.PUBLIC) != 0
&& (modifiers & Modifier.TRANSIENT) == 0
&& (modifiers & Modifier.NATIVE) == 0
&& (modifiers & Modifier.STATIC) == 0;
}
private static boolean canWrite(final int modifiers) {
return (modifiers & Modifier.PUBLIC) != 0
&& (modifiers & Modifier.TRANSIENT) == 0
&& (modifiers & Modifier.NATIVE) == 0
&& (modifiers & Modifier.FINAL) == 0
&& (modifiers & Modifier.STATIC) == 0;
}
}