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package com.jsoniter;

import com.jsoniter.spi.*;

import java.io.IOException;

import java.lang.reflect.Constructor;

import java.lang.reflect.Method;

import java.util.*;

public class ReflectionDecoder implements Decoder {

private static Object NOT_SET = new Object() {

@Override

public String toString() {

return "NOT_SET";

}

};

private Constructor ctor;

private Method staticFactory;

private Map<Slice, Binding> allBindings = new HashMap<Slice, Binding>();

private List<Binding> ctorParams = new ArrayList<Binding>();

private List<Binding> fields;

private List<SetterDescriptor> setters;

private String tempCacheKey;

private String ctorArgsCacheKey;

private int tempCount;

public ReflectionDecoder(Class clazz) {

try {

init(clazz);

} catch (Exception e) {

throw new JsonException(e);

}

}

private final void init(Class clazz) throws Exception {

ClassDescriptor desc = ExtensionManager.getClassDescriptor(clazz, true);

ctorParams = desc.ctor.parameters;

int tempIdx = 0;

for (Binding param : ctorParams) {

tempIdx = addBinding(clazz, tempIdx, param);

}

this.ctor = desc.ctor.ctor;

this.staticFactory = desc.ctor.staticFactory;

if (this.ctor == null && this.staticFactory == null) {

throw new JsonException("no constructor for: " + desc.clazz);

}

fields = desc.fields;

for (Binding field : fields) {

tempIdx = addBinding(clazz, tempIdx, field);

}

setters = desc.setters;

for (SetterDescriptor setter : setters) {

for (Binding param : setter.parameters) {

tempIdx = addBinding(clazz, tempIdx, param);

}

}

if (!ctorParams.isEmpty() || !setters.isEmpty()) {

tempCount = tempIdx;

tempCacheKey = "temp@" + clazz.getCanonicalName();

ctorArgsCacheKey = "ctor@" + clazz.getCanonicalName();

}

}

private int addBinding(Class clazz, int tempIdx, Binding param) {

param.idx = tempIdx;

for (String fromName : param.fromNames) {

Slice slice = Slice.make(fromName);

if (allBindings.containsKey(slice)) {

throw new JsonException("name conflict found in " + clazz + ": " + fromName);

}

allBindings.put(slice, param);

}

tempIdx++;

return tempIdx;

}

@Override

public final Object decode(JsonIterator iter) throws IOException {

try {

if (ctorParams.isEmpty()) {

if (setters.isEmpty()) {

return decodeWithOnlyFieldBinding(iter);

} else {

return decodeWithSetterBinding(iter);

}

} else {

return decodeWithCtorBinding(iter);

}

} catch (Exception e) {

throw new JsonException(e);

}

}

private final Object decodeWithOnlyFieldBinding(JsonIterator iter) throws Exception {

if (iter.readNull()) {

CodegenAccess.resetExistingObject(iter);

return null;

}

Object obj = CodegenAccess.existingObject(iter) == null ? createNewObject() : CodegenAccess.resetExistingObject(iter);

if (!CodegenAccess.readObjectStart(iter)) {

return obj;

}

Slice fieldName = CodegenAccess.readObjectFieldAsSlice(iter);

Binding binding = allBindings.get(fieldName);

if (binding == null) {

iter.skip();

} else {

binding.field.set(obj, CodegenAccess.read(iter, binding.valueTypeLiteral));

}

while (CodegenAccess.nextToken(iter) == ',') {

fieldName = CodegenAccess.readObjectFieldAsSlice(iter);

binding = allBindings.get(fieldName);

if (binding == null) {

iter.skip();

} else {

binding.field.set(obj, CodegenAccess.read(iter, binding.valueTypeLiteral));

}

}

return obj;

}

private final Object decodeWithCtorBinding(JsonIterator iter) throws Exception {

if (iter.readNull()) {

CodegenAccess.resetExistingObject(iter);

return null;

}

Object[] temp = (Object[]) iter.tempObjects.get(tempCacheKey);

if (temp == null) {

temp = new Object[tempCount];

iter.tempObjects.put(tempCacheKey, temp);

}

Arrays.fill(temp, NOT_SET);

if (!CodegenAccess.readObjectStart(iter)) {

return createNewObject(iter, temp);

}

Slice fieldName = CodegenAccess.readObjectFieldAsSlice(iter);

Binding binding = allBindings.get(fieldName);

if (binding == null) {

iter.skip();

} else {

temp[binding.idx] = CodegenAccess.read(iter, binding.valueTypeLiteral);

}

while (CodegenAccess.nextToken(iter) == ',') {

fieldName = CodegenAccess.readObjectFieldAsSlice(iter);

binding = allBindings.get(fieldName);

if (binding == null) {

iter.skip();

} else {

temp[binding.idx] = CodegenAccess.read(iter, binding.valueTypeLiteral);

}

}

Object obj = createNewObject(iter, temp);

for (Binding field : fields) {

Object val = temp[field.idx];

if (val != NOT_SET) {

field.field.set(obj, val);

}

}

applySetters(temp, obj);

return obj;

}

private final Object decodeWithSetterBinding(JsonIterator iter) throws Exception {

if (iter.readNull()) {

CodegenAccess.resetExistingObject(iter);

return null;

}

Object obj = createNewObject();

if (!CodegenAccess.readObjectStart(iter)) {

return obj;

}

Object[] temp = (Object[]) iter.tempObjects.get(tempCacheKey);

if (temp == null) {

temp = new Object[tempCount];

iter.tempObjects.put(tempCacheKey, temp);

}

Arrays.fill(temp, NOT_SET);

Slice fieldName = CodegenAccess.readObjectFieldAsSlice(iter);

Binding binding = allBindings.get(fieldName);

if (binding == null) {

iter.skip();

} else {

if (binding.field == null) {

temp[binding.idx] = CodegenAccess.read(iter, binding.valueTypeLiteral);

} else {

binding.field.set(obj, CodegenAccess.read(iter, binding.valueTypeLiteral));

}

}

while (CodegenAccess.nextToken(iter) == ',') {

fieldName = CodegenAccess.readObjectFieldAsSlice(iter);

binding = allBindings.get(fieldName);

if (binding == null) {

iter.skip();

} else {

if (binding.field == null) {

temp[binding.idx] = CodegenAccess.read(iter, binding.valueTypeLiteral);

} else {

binding.field.set(obj, CodegenAccess.read(iter, binding.valueTypeLiteral));

}

}

}

applySetters(temp, obj);

return obj;

}

private void applySetters(Object[] temp, Object obj) throws Exception {

for (SetterDescriptor setter : setters) {

Object[] args = new Object[setter.parameters.size()];

for (int i = 0; i < setter.parameters.size(); i++) {

args[i] = temp[setter.parameters.get(i).idx];

}

setter.method.invoke(obj, args);

}

}

private Object createNewObject(JsonIterator iter, Object[] temp) throws Exception {

Object[] ctorArgs = (Object[]) iter.tempObjects.get(ctorArgsCacheKey);

if (ctorArgs == null) {

ctorArgs = new Object[ctorParams.size()];

iter.tempObjects.put(ctorArgsCacheKey, ctorArgs);

}

Arrays.fill(ctorArgs, null);

for (int i = 0; i < ctorParams.size(); i++) {

Object arg = temp[ctorParams.get(i).idx];

if (arg != NOT_SET) {

ctorArgs[i] = arg;

}

}

return createNewObject(ctorArgs);

}

private Object createNewObject(Object... args) throws Exception {

if (ctor == null) {

return staticFactory.invoke(null, args);

} else {

return ctor.newInstance(args);

}

}

}