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package com.fasterxml.jackson.databind.deser;

import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.util.AccessPattern;

/**
 * Helper interface implemented by classes that are to be used as
 * null providers during deserialization. Most importantly implemented by
 * {@link com.fasterxml.jackson.databind.JsonDeserializer} (as a mix-in
 * interface), but also by converters used to support more configurable
 * null replacement.
 *
 * @since 2.9
 */
public interface NullValueProvider
{
    /**
     * Method called to possibly convert incoming `null` token (read via
     * underlying streaming input source) into other value of type accessor
     * supports. May return `null`, or value compatible with type binding.
     *

* NOTE: if {@link #getNullAccessPattern()} returns `ALWAYS_NULL` or * `CONSTANT`, this method WILL NOT use provided `ctxt` and it may thus * be passed as `null`. */ public Object getNullValue(DeserializationContext ctxt) throws JsonMappingException; /** * Accessor that may be used to determine if and when provider must be called to * access null replacement value. */ public AccessPattern getNullAccessPattern(); /** * Method called to determine placeholder value to be used for cases * where no value was obtained from input but we must pass a value * nonetheless: the common case is that of Creator methods requiring * passing a value for every parameter. * Usually this is same as {@link #getNullValue} (which in turn * is usually simply Java {@code null}), but it can be overridden * for specific types: most notable scalar types must use "default" * values. *

* This method needs to be called every time a determination is made. *

* Default implementation simply calls and returns {@link #getNullValue}. * * @since 2.13 */ default Object getAbsentValue(DeserializationContext ctxt) throws JsonMappingException { return getNullValue(ctxt); } }





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