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package com.jsoniter;

import com.jsoniter.spi.*;

import java.io.IOException;

import java.lang.reflect.Type;

class MapKeyDecoders {

public static Decoder registerOrGetExisting(Type mapKeyType) {

String cacheKey = JsoniterSpi.getMapKeyDecoderCacheKey(mapKeyType);

Decoder mapKeyDecoder = JsoniterSpi.getMapKeyDecoder(cacheKey);

if (null != mapKeyDecoder) {

return mapKeyDecoder;

}

mapKeyDecoder = createMapKeyDecoder(mapKeyType);

JsoniterSpi.addNewMapDecoder(cacheKey, mapKeyDecoder);

return mapKeyDecoder;

}

private static Decoder createMapKeyDecoder(Type mapKeyType) {

if (String.class == mapKeyType) {

return new StringKeyDecoder();

}

if (mapKeyType instanceof Class && ((Class) mapKeyType).isEnum()) {

return new EnumKeyDecoder((Class) mapKeyType);

}

Decoder decoder = CodegenImplNative.NATIVE_DECODERS.get(mapKeyType);

if (decoder != null) {

return new NumberKeyDecoder(decoder);

}

throw new JsonException("can not decode map key type: " + mapKeyType);

}

private static class StringKeyDecoder implements Decoder {

@Override

public Object decode(JsonIterator iter) throws IOException {

return iter.readString();

}

}

private static class EnumKeyDecoder implements Decoder {

private final Class enumClass;

private EnumKeyDecoder(Class enumClass) {

this.enumClass = enumClass;

}

@Override

public Object decode(JsonIterator iter) throws IOException {

return iter.read(enumClass);

}

}

private static class NumberKeyDecoder implements Decoder {

private final Decoder decoder;

private NumberKeyDecoder(Decoder decoder) {

this.decoder = decoder;

}

@Override

public Object decode(JsonIterator iter) throws IOException {

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

throw iter.reportError("decode number map key", "expect \"");

}

Object key = decoder.decode(iter);

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

throw iter.reportError("decode number map key", "expect \"");

}

return key;

}

}

}