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jsoniter (json-iterator) is fast and flexible JSON parser available in Java and Go

There is a newer version: 0.9.23

package com.jsoniter;

import com.jsoniter.spi.Decoder;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

class ReflectionEnumDecoder implements Decoder{

    private final Map enumMap = new HashMap();
    private Class clazz;

    public ReflectionEnumDecoder(Class clazz) {
        this.clazz = clazz;
        for (Object e : clazz.getEnumConstants()) {
            enumMap.put(Slice.make(e.toString()), e);
        }
    }
    @Override
    public Object decode(JsonIterator iter) throws IOException {
        if (iter.readNull()) {
            return null;
        }
        Slice slice = IterImpl.readSlice(iter);
        Object e = enumMap.get(slice);
        if (e == null) {
            throw iter.reportError("ReflectionEnumDecoder", slice + " is not valid enum for " + clazz);
        }
        return e;
    }
}