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Data Mapper package is a high-performance data binding package built on Jackson JSON processor

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package org.codehaus.jackson.map;

import org.codehaus.jackson.map.deser.BeanDeserializerModifier;
import org.codehaus.jackson.type.JavaType;

/**
 * Abstract class that defines API used by {@link ObjectMapper} and
 * {@link JsonDeserializer}s to obtain deserializers capable of
 * re-constructing instances of handled type from JSON content.
 */
public abstract class DeserializerProvider
{
    protected DeserializerProvider() { }

    /**
     * Method that is to configure {@link DeserializerFactory} that provider has
     * to use specified deserializer provider, with highest precedence (that is,
     * additional providers have higher precedence than default one or previously
     * added ones)
     * 
     * @since 1.7
     */
    public abstract DeserializerProvider withAdditionalDeserializers(Deserializers d);

    /**
     * @since 1.7
     */
    public abstract DeserializerProvider withDeserializerModifier(BeanDeserializerModifier modifier);
    
    /*
    /**********************************************************
    /* General deserializer locating method
    /**********************************************************
     */

    /**
     * Method called to get hold of a deserializer for a value of given type;
     * or if no such deserializer can be found, a default handler (which
     * may do a best-effort generic serialization or just simply
     * throw an exception when invoked).
     *

     * Note: this method is only called for value types; not for keys.
     * Key deserializers can be accessed using {@link #findKeyDeserializer}.
     *
     * @param config Deserialization configuration
     * @param propertyType Declared type of the value to deserializer (obtained using
     *   'setter' method signature and/or type annotations
     * @param property Object that represents accessor for property value; field,
     *    setter method or constructor parameter.
     *
     * @throws JsonMappingException if there are fatal problems with
     *   accessing suitable deserializer; including that of not
     *   finding any serializer
     */
    public abstract JsonDeserializer findValueDeserializer(DeserializationConfig config,
            JavaType propertyType, BeanProperty property)
        throws JsonMappingException;
    
    /**
     * Method called to locate deserializer for given type, as well as matching
     * type deserializer (if one is needed); and if type deserializer is needed,
     * construct a "wrapped" deserializer that can extract and use type information
     * for calling actual deserializer.
     *

     * Since this method is only called for root elements, no referral information
     * is taken.
     *    
     * @since 1.5
     */
    public abstract JsonDeserializer findTypedValueDeserializer(DeserializationConfig config,
            JavaType type, BeanProperty property)
        throws JsonMappingException;

    /**
     * Method called to get hold of a deserializer to use for deserializing
     * keys for {@link java.util.Map}.
     *
     * @throws JsonMappingException if there are fatal problems with
     *   accessing suitable key deserializer; including that of not
     *   finding any serializer
     */
    public abstract KeyDeserializer findKeyDeserializer(DeserializationConfig config,
            JavaType type, BeanProperty property)
        throws JsonMappingException;

    /**
     * Method called to find out whether provider would be able to find
     * a deserializer for given type, using a root reference (i.e. not
     * through fields or membership in an array or collection)
     */
    public abstract boolean hasValueDeserializerFor(DeserializationConfig config, JavaType type);

    /*
    /**********************************************************
    /* Deprecated deserializer locating methods (pre-1.7)
    /**********************************************************
     */

    /**
     * Deprecated version of accessor method that was used before version 1.7.
     * Implemented as final to ensure that existing code does not accidentally
     * try to redefine it (given that it is not called by core mapper code)
     *   
     * @deprecated As of version 1.7, use version that exposes property object
     *    instead of just its type (needed for contextual deserializers)
     */
    @Deprecated
    public final JsonDeserializer findValueDeserializer(DeserializationConfig config,
            JavaType type, JavaType referrer, String refPropName)
        throws JsonMappingException
    {
        return findValueDeserializer(config, type, (BeanProperty) null);
    }

    /**
     * Deprecated version of accessor method that was used before version 1.7.
     * Implemented as final to ensure that existing code does not accidentally
     * try to redefine it (given that it is not called by core mapper code)
     *   
     * @deprecated As of version 1.7, use version that exposes context class
     *    and property, instead of just types
     *    
     * @since 1.5
     */
    @Deprecated
    public final JsonDeserializer findTypedValueDeserializer(DeserializationConfig config,
            JavaType type)
        throws JsonMappingException
    {
        return findTypedValueDeserializer(config, type, null);
    }

    /**
     * Deprecated version of accessor method that was used before version 1.7.
     * Implemented as final to ensure that existing code does not accidentally
     * try to redefine it (given that it is not called by core mapper code)
     *   
     * @deprecated As of version 1.7, use version that exposes context class
     *    and property, instead of just types
     *    
     * @since 1.5
     */
    @Deprecated
    public final KeyDeserializer findKeyDeserializer(DeserializationConfig config, JavaType type)
        throws JsonMappingException
    {
        return findKeyDeserializer(config, type, null);
    }

    /*
    /**********************************************************
    /* Access to caching aspects
    /**********************************************************
     */

    /**
     * Method that can be used to determine how many deserializers this
     * provider is caching currently 
     * (if it does caching: default implementation does)
     * Exact count depends on what kind of deserializers get cached;
     * default implementation caches only dynamically constructed deserializers,
     * but not eagerly constructed standard deserializers (which is different
     * from how serializer provider works).
     *

     * The main use case for this method is to allow conditional flushing of
     * deserializer cache, if certain number of entries is reached.
     * 
     * @since 1.4
     */
    public abstract int cachedDeserializersCount();

    /**
     * Method that will drop all dynamically constructed deserializers (ones that
     * are counted as result value for {@link #cachedDeserializersCount}).
     * This can be used to remove memory usage (in case some deserializers are
     * only used once or so), or to force re-construction of deserializers after
     * configuration changes for mapper than owns the provider.
     * 
     * @since 1.4
     */
    public abstract void flushCachedDeserializers();
}
    

    

    

            

    

            



    
    






    
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