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package com.fasterxml.jackson.databind.deser.impl;

import java.io.IOException;

import com.fasterxml.jackson.annotation.ObjectIdGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.deser.SettableBeanProperty;

/**
 * Object that knows how to deserialize Object Ids.
 */
public class ObjectIdReader
    implements java.io.Serializable
{
    private static final long serialVersionUID = 1L;

    protected final JavaType _idType;

    public final PropertyName propertyName;
    
    /**
     * Blueprint generator instance: actual instance will be
     * fetched from {@link SerializerProvider} using this as
     * the key.
     */
    public final ObjectIdGenerator generator;
    
    /**
     * Deserializer used for deserializing id values.
     */
    protected final JsonDeserializer _deserializer;

    public final SettableBeanProperty idProperty;
    
    /*
    /**********************************************************
    /* Life-cycle
    /**********************************************************
     */
    
    @SuppressWarnings("unchecked")
    protected ObjectIdReader(JavaType t, PropertyName propName, ObjectIdGenerator gen,
            JsonDeserializer deser, SettableBeanProperty idProp)
    {
        _idType = t;
        propertyName = propName;
        generator = gen;
        _deserializer = (JsonDeserializer) deser;
        idProperty = idProp;
    }

    @Deprecated // since 2.3
    protected ObjectIdReader(JavaType t, String propName, ObjectIdGenerator gen,
            JsonDeserializer deser, SettableBeanProperty idProp)
    {
        this(t, new PropertyName(propName), gen, deser, idProp);
    }

    /**
     * Factory method called by {@link com.fasterxml.jackson.databind.ser.std.BeanSerializerBase}
     * with the initial information based on standard settings for the type
     * for which serializer is being built.
     */
    public static ObjectIdReader construct(JavaType idType, PropertyName propName,
            ObjectIdGenerator generator, JsonDeserializer deser,
            SettableBeanProperty idProp)
    {
        return new ObjectIdReader(idType, propName, generator, deser, idProp);
    }
    
    @Deprecated // since 2.3
    public static ObjectIdReader construct(JavaType idType, String propName,
            ObjectIdGenerator generator, JsonDeserializer deser,
            SettableBeanProperty idProp)
    {
        return construct(idType, new PropertyName(propName), generator, deser, idProp);
    }

    /*
    /**********************************************************
    /* API
    /**********************************************************
     */

    public JsonDeserializer getDeserializer() {
        return _deserializer;
    }

    public JavaType getIdType() {
        return _idType;
    }
    
    /**
     * Method called to read value that is expected to be an Object Reference
     * (that is, value of an Object Id used to refer to another object).
     * 
     * @since 2.3
     */
    public Object readObjectReference(JsonParser jp, DeserializationContext ctxt)
        throws IOException, JsonProcessingException
    {
        return _deserializer.deserialize(jp, ctxt);
    }
}