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ClassDescriptor.java
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package com.jsoniter.spi;
import java.lang.reflect.*;
import java.util.*;
import static java.lang.reflect.Modifier.isTransient;
public class ClassDescriptor {
public ClassInfo classInfo;
public Class clazz;
public Map<String, Type> lookup;
public ConstructorDescriptor ctor;
public List<Binding> fields;
public List<Binding> setters;
public List<Binding> getters;
public List<WrapperDescriptor> bindingTypeWrappers;
public List<Method> keyValueTypeWrappers;
public List<UnwrapperDescriptor> unwrappers;
public boolean asExtraForUnknownProperties;
public Binding onMissingProperties;
public Binding onExtraProperties;
private ClassDescriptor() {
}
public static ClassDescriptor getDecodingClassDescriptor(ClassInfo classInfo, boolean includingPrivate) {
Class clazz = classInfo.clazz;
Map<String, Type> lookup = collectTypeVariableLookup(classInfo.type);
ClassDescriptor desc = new ClassDescriptor();
desc.classInfo = classInfo;
desc.clazz = clazz;
desc.lookup = lookup;
desc.ctor = getCtor(clazz);
desc.setters = getSetters(lookup, classInfo, includingPrivate);
desc.getters = new ArrayList<Binding>();
desc.fields = getFields(lookup, classInfo, includingPrivate);
desc.bindingTypeWrappers = new ArrayList<WrapperDescriptor>();
desc.keyValueTypeWrappers = new ArrayList<Method>();
desc.unwrappers = new ArrayList<UnwrapperDescriptor>();
for (Extension extension : JsoniterSpi.getExtensions()) {
extension.updateClassDescriptor(desc);
}
for (Binding field : desc.fields) {
if (field.valueType instanceof Class) {
Class valueClazz = (Class) field.valueType;
if (valueClazz.isArray()) {
field.valueCanReuse = false;
continue;
}
}
field.valueCanReuse = field.valueTypeLiteral.nativeType == null;
}
decodingDeduplicate(desc);
if (includingPrivate) {
if (desc.ctor.ctor != null) {
desc.ctor.ctor.setAccessible(true);
}
if (desc.ctor.staticFactory != null) {
desc.ctor.staticFactory.setAccessible(true);
}
for (WrapperDescriptor setter : desc.bindingTypeWrappers) {
setter.method.setAccessible(true);
}
}
for (Binding binding : desc.allDecoderBindings()) {
if (binding.fromNames == null) {
binding.fromNames = new String[]{binding.name};
}
if (binding.field != null && includingPrivate) {
binding.field.setAccessible(true);
}
if (binding.method != null && includingPrivate) {
binding.method.setAccessible(true);
}
if (binding.decoder != null) {
JsoniterSpi.addNewDecoder(binding.decoderCacheKey(), binding.decoder);
}
}
return desc;
}
public static ClassDescriptor getEncodingClassDescriptor(ClassInfo classInfo, boolean includingPrivate) {
Class clazz = classInfo.clazz;
Map<String, Type> lookup = collectTypeVariableLookup(classInfo.type);
ClassDescriptor desc = new ClassDescriptor();
desc.classInfo = classInfo;
desc.clazz = clazz;
desc.lookup = lookup;
desc.fields = getFields(lookup, classInfo, includingPrivate);
desc.getters = getGetters(lookup, classInfo, includingPrivate);
desc.bindingTypeWrappers = new ArrayList<WrapperDescriptor>();
desc.keyValueTypeWrappers = new ArrayList<Method>();
desc.unwrappers = new ArrayList<UnwrapperDescriptor>();
for (Extension extension : JsoniterSpi.getExtensions()) {
extension.updateClassDescriptor(desc);
}
encodingDeduplicate(desc);
for (Binding binding : desc.allEncoderBindings()) {
if (binding.toNames == null) {
binding.toNames = new String[]{binding.name};
}
if (binding.field != null && includingPrivate) {
binding.field.setAccessible(true);
}
if (binding.method != null && includingPrivate) {
binding.method.setAccessible(true);
}
if (binding.encoder != null) {
JsoniterSpi.addNewEncoder(binding.encoderCacheKey(), binding.encoder);
}
}
return desc;
}
private static void decodingDeduplicate(ClassDescriptor desc) {
HashMap<String, Binding> byFromName = new HashMap<String, Binding>();
HashMap<String, Binding> byFieldName = new HashMap<String, Binding>();
for (Binding field : desc.fields) {
for (String fromName : field.fromNames) {
if (byFromName.containsKey(fromName)) {
throw new JsonException("field decode from same name: " + fromName);
}
byFromName.put(fromName, field);
}
byFieldName.put(field.name, field);
}
ArrayList<Binding> iteratingSetters = new ArrayList<Binding>(desc.setters);
Collections.reverse(iteratingSetters);
for (Binding setter : iteratingSetters) {
if (setter.fromNames.length == 0) {
continue;
}
Binding existing = byFieldName.get(setter.name);
if (existing != null) {
existing.fromNames = new String[0];
}
deduplicateByFromName(byFromName, setter);
}
for (WrapperDescriptor wrapper : desc.bindingTypeWrappers) {
for (Binding param : wrapper.parameters) {
deduplicateByFromName(byFromName, param);
}
}
for (Binding param : desc.ctor.parameters) {
deduplicateByFromName(byFromName, param);
}
}
private static void deduplicateByFromName(Map<String, Binding> byFromName, Binding setter) {
for (String fromName : setter.fromNames) {
Binding existing = byFromName.get(fromName);
if (existing == null) {
byFromName.put(fromName, setter);
continue;
}
existing.fromNames = new String[0];
}
}
private static void encodingDeduplicate(ClassDescriptor desc) {
HashMap<String, Binding> byToName = new HashMap<String, Binding>();
HashMap<String, Binding> byFieldName = new HashMap<String, Binding>();
for (Binding field : desc.fields) {
for (String toName : field.toNames) {
if (byToName.containsKey(toName)) {
throw new JsonException("field encode to same name: " + toName);
}
byToName.put(toName, field);
}
byFieldName.put(field.name, field);
}
for (Binding getter : new ArrayList<Binding>(desc.getters)) {
if (getter.toNames.length == 0) {
continue;
}
Binding existing = byFieldName.get(getter.name);
if (existing != null) {
existing.toNames = new String[0];
}
for (String toName : getter.toNames) {
existing = byToName.get(toName);
if (existing == null) {
byToName.put(toName, getter);
continue;
}
existing.toNames = new String[0];
}
}
}
private static ConstructorDescriptor getCtor(Class clazz) {
ConstructorDescriptor cctor = new ConstructorDescriptor();
if (JsoniterSpi.canCreate(clazz)) {
cctor.objectFactory = JsoniterSpi.getObjectFactory(clazz);
return cctor;
}
try {
cctor.ctor = clazz.getDeclaredConstructor();
} catch (Exception e) {
cctor.ctor = null;
}
return cctor;
}
private static List<Binding> getFields(Map<String, Type> lookup, ClassInfo classInfo, boolean includingPrivate) {
ArrayList<Binding> bindings = new ArrayList<Binding>();
for (Field field : getAllFields(classInfo.clazz, includingPrivate)) {
if (Modifier.isStatic(field.getModifiers())) {
continue;
}
if (!includingPrivate && !Modifier.isPublic(field.getType().getModifiers())) {
continue;
}
if (includingPrivate) {
field.setAccessible(true);
}
if (isTransient(field.getModifiers())) {
continue;
}
Binding binding = createBindingFromField(lookup, classInfo, field);
bindings.add(binding);
}
return bindings;
}
private static Binding createBindingFromField(Map<String, Type> lookup, ClassInfo classInfo, Field field) {
try {
Binding binding = new Binding(classInfo, lookup, field.getGenericType());
binding.fromNames = new String[]{field.getName()};
binding.toNames = new String[]{field.getName()};
binding.name = field.getName();
binding.annotations = field.getAnnotations();
binding.field = field;
return binding;
} catch (Exception e) {
throw new JsonException("failed to create binding for field: " + field, e);
}
}
private static List<Field> getAllFields(Class clazz, boolean includingPrivate) {
List<Field> allFields = Arrays.asList(clazz.getFields());
if (includingPrivate) {
allFields = new ArrayList<Field>();
Class current = clazz;
while (current != null) {
allFields.addAll(Arrays.asList(current.getDeclaredFields()));
current = current.getSuperclass();
}
}
return allFields;
}
private static List<Binding> getSetters(Map<String, Type> lookup, ClassInfo classInfo, boolean includingPrivate) {
ArrayList<Binding> setters = new ArrayList<Binding>();
for (Method method : getAllMethods(classInfo.clazz, includingPrivate)) {
if (Modifier.isStatic(method.getModifiers())) {
continue;
}
String methodName = method.getName();
if (methodName.length() < 4) {
continue;
}
if (!methodName.startsWith("set")) {
continue;
}
Type[] paramTypes = method.getGenericParameterTypes();
if (paramTypes.length != 1) {
continue;
}
if (!includingPrivate && !Modifier.isPublic(method.getParameterTypes()[0].getModifiers())) {
continue;
}
if (includingPrivate) {
method.setAccessible(true);
}
try {
String fromName = translateSetterName(methodName);
Field field = null;
try {
field = method.getDeclaringClass().getDeclaredField(fromName);
} catch (NoSuchFieldException e) {
// ignore
}
Binding setter = new Binding(classInfo, lookup, paramTypes[0]);
if (field != null && isTransient(field.getModifiers())) {
setter.fromNames = new String[0];
} else {
setter.fromNames = new String[]{fromName};
}
setter.name = fromName;
setter.method = method;
setter.annotations = method.getAnnotations();
setters.add(setter);
} catch (Exception e) {
throw new JsonException("failed to create binding from setter: " + method, e);
}
}
return setters;
}
private static List<Method> getAllMethods(Class clazz, boolean includingPrivate) {
List<Method> allMethods = Arrays.asList(clazz.getMethods());
if (includingPrivate) {
allMethods = new ArrayList<Method>();
Class current = clazz;
while (current != null) {
allMethods.addAll(Arrays.asList(current.getDeclaredMethods()));
current = current.getSuperclass();
}
}
return allMethods;
}
private static String translateSetterName(String methodName) {
if (!methodName.startsWith("set")) {
return null;
}
String fromName = methodName.substring("set".length());
char[] fromNameChars = fromName.toCharArray();
fromNameChars[0] = Character.toLowerCase(fromNameChars[0]);
fromName = new String(fromNameChars);
return fromName;
}
private static List<Binding> getGetters(Map<String, Type> lookup, ClassInfo classInfo, boolean includingPrivate) {
ArrayList<Binding> getters = new ArrayList<Binding>();
for (Method method : getAllMethods(classInfo.clazz, includingPrivate)) {
if (Modifier.isStatic(method.getModifiers())) {
continue;
}
String methodName = method.getName();
if ("getClass".equals(methodName)) {
continue;
}
if (methodName.length() < 4) {
continue;
}
if (!methodName.startsWith("get")) {
continue;
}
if (method.getGenericParameterTypes().length != 0) {
continue;
}
String toName = methodName.substring("get".length());
char[] toNameChars = toName.toCharArray();
toNameChars[0] = Character.toLowerCase(toNameChars[0]);
toName = new String(toNameChars);
Binding getter = new Binding(classInfo, lookup, method.getGenericReturnType());
Field field = null;
try {
field = method.getDeclaringClass().getDeclaredField(toName);
} catch (NoSuchFieldException e) {
// ignore
}
if (field != null && isTransient(field.getModifiers())) {
getter.toNames = new String[0];
} else {
getter.toNames = new String[]{toName};
}
getter.name = toName;
getter.method = method;
getter.annotations = method.getAnnotations();
getters.add(getter);
}
return getters;
}
private static Map<String, Type> collectTypeVariableLookup(Type type) {
HashMap<String, Type> vars = new HashMap<String, Type>();
if (null == type) {
return vars;
}
if (type instanceof ParameterizedType) {
ParameterizedType pType = (ParameterizedType) type;
Type[] actualTypeArguments = pType.getActualTypeArguments();
Class clazz = (Class) pType.getRawType();
for (int i = 0; i < clazz.getTypeParameters().length; i++) {
TypeVariable variable = clazz.getTypeParameters()[i];
vars.put(variable.getName() + "@" + clazz.getCanonicalName(), actualTypeArguments[i]);
}
vars.putAll(collectTypeVariableLookup(clazz.getGenericSuperclass()));
return vars;
}
if (type instanceof Class) {
Class clazz = (Class) type;
vars.putAll(collectTypeVariableLookup(clazz.getGenericSuperclass()));
return vars;
}
throw new JsonException("unexpected type: " + type);
}
public List<Binding> allBindings() {
ArrayList<Binding> bindings = new ArrayList<Binding>(8);
bindings.addAll(fields);
if (setters != null) {
bindings.addAll(setters);
}
if (getters != null) {
bindings.addAll(getters);
}
if (ctor != null) {
bindings.addAll(ctor.parameters);
}
if (bindingTypeWrappers != null) {
for (WrapperDescriptor setter : bindingTypeWrappers) {
bindings.addAll(setter.parameters);
}
}
return bindings;
}
public List<Binding> allDecoderBindings() {
ArrayList<Binding> bindings = new ArrayList<Binding>(8);
bindings.addAll(fields);
bindings.addAll(setters);
if (ctor != null) {
bindings.addAll(ctor.parameters);
}
for (WrapperDescriptor setter : bindingTypeWrappers) {
bindings.addAll(setter.parameters);
}
return bindings;
}
public List<Binding> allEncoderBindings() {
ArrayList<Binding> bindings = new ArrayList<Binding>(8);
bindings.addAll(fields);
bindings.addAll(getters);
return bindings;
}
public List<EncodeTo> encodeTos() {
HashMap<String, Integer> previousAppearance = new HashMap<String, Integer>();
ArrayList<EncodeTo> encodeTos = new ArrayList<EncodeTo>(8);
collectEncodeTo(encodeTos, fields, previousAppearance);
collectEncodeTo(encodeTos, getters, previousAppearance);
ArrayList<EncodeTo> removedNulls = new ArrayList<EncodeTo>(encodeTos.size());
for (EncodeTo encodeTo : encodeTos) {
if (encodeTo != null) {
removedNulls.add(encodeTo);
}
}
return removedNulls;
}
private void collectEncodeTo(ArrayList<EncodeTo> encodeTos, List<Binding> fields, HashMap<String, Integer> previousAppearance) {
for (Binding field : fields) {
for (String toName : field.toNames) {
if (previousAppearance.containsKey(toName)) {
encodeTos.set(previousAppearance.get(toName), null);
}
previousAppearance.put(toName, encodeTos.size());
EncodeTo encodeTo = new EncodeTo();
encodeTo.binding = field;
encodeTo.toName = toName;
encodeTos.add(encodeTo);
}
}
}
}