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    • parquet.org.codehaus.jackson.map.deser.std.EnumMapDeserializer Maven / Gradle / Ivy

    package com.facebook.presto.hive.$internal.org.codehaus.jackson.map.deser.std;

import java.io.IOException;
import java.util.*;

import com.facebook.presto.hive.$internal.org.codehaus.jackson.JsonProcessingException;
import com.facebook.presto.hive.$internal.org.codehaus.jackson.JsonParser;
import com.facebook.presto.hive.$internal.org.codehaus.jackson.JsonToken;
import com.facebook.presto.hive.$internal.org.codehaus.jackson.map.JsonDeserializer;
import com.facebook.presto.hive.$internal.org.codehaus.jackson.map.DeserializationContext;
import com.facebook.presto.hive.$internal.org.codehaus.jackson.map.TypeDeserializer;
import com.facebook.presto.hive.$internal.org.codehaus.jackson.map.deser.std.StdDeserializer;
import com.facebook.presto.hive.$internal.org.codehaus.jackson.map.util.EnumResolver;

/**
 * 
 * 
    
 * Note: casting within this class is all messed up -- just could not figure out a way
 * to properly deal with recursive definition of "EnumMap, V>
 * 
 * @author tsaloranta
 * 
 * @since 1.9 (renamed from 'com.facebook.presto.hive.$internal.org.codehaus.jackson.map.deser.EnumMapDeserializer')
 */
@SuppressWarnings({ "unchecked", "rawtypes" }) 
public class EnumMapDeserializer
    extends StdDeserializer>
{
    protected final Class _enumClass;

    protected final JsonDeserializer> _keyDeserializer;

    protected final JsonDeserializer _valueDeserializer;

    @Deprecated
    public EnumMapDeserializer(EnumResolver enumRes, JsonDeserializer valueDeser)
    {
        this(enumRes.getEnumClass(), new EnumDeserializer(enumRes), valueDeser);
    }

    public EnumMapDeserializer(Class enumClass, JsonDeserializer keyDeserializer,
            JsonDeserializer valueDeser)
    {
        super(EnumMap.class);
        _enumClass = enumClass;
        _keyDeserializer = (JsonDeserializer>) keyDeserializer;
        _valueDeserializer = valueDeser;
    }
    
    @Override
    public EnumMap deserialize(JsonParser jp, DeserializationContext ctxt)
        throws IOException, JsonProcessingException
    {
        // Ok: must point to START_OBJECT
        if (jp.getCurrentToken() != JsonToken.START_OBJECT) {
            throw ctxt.mappingException(EnumMap.class);
        }
        EnumMap result = constructMap();

        while ((jp.nextToken()) != JsonToken.END_OBJECT) {
            Enum key = _keyDeserializer.deserialize(jp, ctxt);
            if (key == null) {
                throw ctxt.weirdStringException(_enumClass, "value not one of declared Enum instance names");
            }
            // And then the value...
            JsonToken t = jp.nextToken();
            /* note: MUST check for nulls separately: deserializers will
             * not handle them (and maybe fail or return bogus data)
             */
            Object value = (t == JsonToken.VALUE_NULL) ?
                null :  _valueDeserializer.deserialize(jp, ctxt);
            result.put(key, value);
        }
        return result;
    }

    @Override
    public Object deserializeWithType(JsonParser jp, DeserializationContext ctxt,
            TypeDeserializer typeDeserializer)
        throws IOException, JsonProcessingException
    {
        // In future could check current token... for now this should be enough:
        return typeDeserializer.deserializeTypedFromObject(jp, ctxt);
    }
    
    private EnumMap constructMap()
    {
    	return new EnumMap(_enumClass);
    }
}
    
    
    
    

    




    
    
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