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MapKeyDecoders.java
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77 lines (62 loc) · 2.31 KB
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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;
}
}
}