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package com.jsoniter;

import com.jsoniter.spi.*;

import java.io.IOException;

import java.lang.reflect.Constructor;

import java.lang.reflect.Type;

import java.util.Map;

class ReflectionMapDecoder implements Decoder {

private final Constructor ctor;

private final Decoder valueTypeDecoder;

private final Decoder mapKeyDecoder;

public ReflectionMapDecoder(Class clazz, Type[] typeArgs) {

try {

ctor = clazz.getConstructor();

} catch (NoSuchMethodException e) {

throw new JsonException(e);

}

Type keyType = typeArgs[0];

mapKeyDecoder = MapKeyDecoders.registerOrGetExisting(keyType);

TypeLiteral valueTypeLiteral = TypeLiteral.create(typeArgs[1]);

valueTypeDecoder = Codegen.getDecoder(valueTypeLiteral.getDecoderCacheKey(), typeArgs[1]);

}

@Override

public Object decode(JsonIterator iter) throws IOException {

try {

return decode_(iter);

} catch (JsonException e) {

throw e;

} catch (Exception e) {

throw new JsonException(e);

}

}

private Object decode_(JsonIterator iter) throws Exception {

Map map = (Map) CodegenAccess.resetExistingObject(iter);

if (iter.readNull()) {

return null;

}

if (map == null) {

map = (Map) ctor.newInstance();

}

if (!CodegenAccess.readObjectStart(iter)) {

return map;

}

do {

Object decodedMapKey = readMapKey(iter);

map.put(decodedMapKey, valueTypeDecoder.decode(iter));

} while(CodegenAccess.nextToken(iter) == ',');

return map;

}

private Object readMapKey(JsonIterator iter) throws IOException {

Object key = mapKeyDecoder.decode(iter);

if (':' != IterImpl.nextToken(iter)) {

throw iter.reportError("readMapKey", "expect :");

}

return key;

}

}