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    • org.testifyproject.fasterxml.jackson.databind.JsonDeserializer Maven / Gradle / Ivy

    package org.testifyproject.testifyproject.fasterxml.jackson.databind;

import java.org.testifyproject.testifyproject.IOException;
import java.util.Collection;

import org.testifyproject.testifyproject.fasterxml.jackson.core.*;
import org.testifyproject.testifyproject.fasterxml.jackson.databind.org.testifyproject.testifyprojectser.BeanDeserializerFactory;
import org.testifyproject.testifyproject.fasterxml.jackson.databind.org.testifyproject.testifyprojectser.SettableBeanProperty;
import org.testifyproject.testifyproject.fasterxml.jackson.databind.org.testifyproject.testifyprojectser.impl.ObjectIdReader;
import org.testifyproject.testifyproject.fasterxml.jackson.databind.jsontype.TypeDeserializer;
import org.testifyproject.testifyproject.fasterxml.jackson.databind.util.NameTransformer;

/**
 * Abstract class that org.testifyproject.testifyprojectfines API used by {@link ObjectMapper} (and
 * other chained {@link JsonDeserializer}s too) to org.testifyproject.testifyprojectserialize Objects of
 * arbitrary types from JSON, using provided {@link JsonParser}.
 *
    
 * Custom org.testifyproject.testifyprojectserializers should usually not directly extend this class,
 * but instead extend {@link org.testifyproject.testifyproject.fasterxml.jackson.databind.org.testifyproject.testifyprojectser.std.StdDeserializer}
 * (or its subtypes like {@link org.testifyproject.testifyproject.fasterxml.jackson.databind.org.testifyproject.testifyprojectser.std.StdScalarDeserializer}).
 *
    
 * If org.testifyproject.testifyprojectserializer is an aggregate one -- meaning it org.testifyproject.testifyprojectlegates handling of some
 * of its contents by using other org.testifyproject.testifyprojectserializer(s) -- it typically also needs
 * to implement {@link org.testifyproject.testifyproject.fasterxml.jackson.databind.org.testifyproject.testifyprojectser.ResolvableDeserializer},
 * which can locate org.testifyproject.testifyprojectpendant org.testifyproject.testifyprojectserializers. This is important to allow dynamic
 * overrides of org.testifyproject.testifyprojectserializers; separate call interface is needed to separate
 * resolution of org.testifyproject.testifyprojectpendant org.testifyproject.testifyprojectserializers (which may have cyclic link back
 * to org.testifyproject.testifyprojectserializer itself, directly or indirectly).
 *
    
 * In addition, to support per-property annotations (to configure aspects
 * of org.testifyproject.testifyprojectserialization on per-property basis), org.testifyproject.testifyprojectserializers may want
 * to implement 
 * {@link org.testifyproject.testifyproject.fasterxml.jackson.databind.org.testifyproject.testifyprojectser.ContextualDeserializer},
 * which allows specialization of org.testifyproject.testifyprojectserializers: call to
 * {@link org.testifyproject.testifyproject.fasterxml.jackson.databind.org.testifyproject.testifyprojectser.ContextualDeserializer#createContextual}
 * is passed information on property, and can create a newly configured
 * org.testifyproject.testifyprojectserializer for handling that particular property.
 *
    
 * If both
 * {@link org.testifyproject.testifyproject.fasterxml.jackson.databind.org.testifyproject.testifyprojectser.ResolvableDeserializer} and
 * {@link org.testifyproject.testifyproject.fasterxml.jackson.databind.org.testifyproject.testifyprojectser.ContextualDeserializer}
 * are implemented, resolution of org.testifyproject.testifyprojectserializers occurs before
 * contextualization.
 */
public abstract class JsonDeserializer
{
    /*
    /**********************************************************
    /* Main org.testifyproject.testifyprojectserialization methods
    /**********************************************************
     */
    
    /**
     * Method that can be called to ask implementation to org.testifyproject.testifyprojectserialize
     * JSON content into the value type this serializer handles.
     * Returned instance is to be constructed by method itself.
     *
    
     * Pre-condition for this method is that the parser points to the
     * first event that is part of value to org.testifyproject.testifyprojectserializer (and which 
     * is never JSON 'null' literal, more on this below): for simple
     * types it may be the only value; and for structured types the
     * Object start marker or a FIELD_NAME.
     * 
    
     * 
    
     * The two possible input conditions for structured types result
     * from polymorphism via fields. In the ordinary case, Jackson
     * calls this method when it has encountered an OBJECT_START,
     * and the method implementation must advance to the next token to
     * see the first field name. If the application configures
     * polymorphism via a field, then the object looks like the following.
     *  
         *      {
     *          "@class": "class name",
     *          ...
     *      }
     *  
    
     *  Jackson consumes the two tokens (the @class field name
     *  and its value) in order to learn the class and select the org.testifyproject.testifyprojectserializer.
     *  Thus, the stream is pointing to the FIELD_NAME for the first field
     *  after the @class. Thus, if you want your method to work correctly
     *  both with and without polymorphism, you must begin your method with:
     *  
         *       if (jp.getCurrentToken() == JsonToken.START_OBJECT) {
     *         jp.nextToken();
     *       }
     *  
    
     * This results in the stream pointing to the field name, so that
     * the two conditions align.
     * 
    
     * Post-condition is that the parser will point to the last
     * event that is part of org.testifyproject.testifyprojectserialized value (or in case org.testifyproject.testifyprojectserialization
     * fails, event that was not recognized or usable, which may be
     * the same event as the one it pointed to upon call).
     *
    
     * Note that this method is never called for JSON null literal,
     * and thus org.testifyproject.testifyprojectserializers need (and should) not check for it.
     *
     * @param p Parsed used for reading JSON content
     * @param ctxt Context that can be used to access information about
     *   this org.testifyproject.testifyprojectserialization activity.
     *
     * @return Deserialized value
     */
    public abstract T org.testifyproject.testifyprojectserialize(JsonParser p, DeserializationContext ctxt)
        throws IOException, JsonProcessingException;

    /**
     * Alternate org.testifyproject.testifyprojectserialization method (org.testifyproject.testifyprojectpared to the most org.testifyproject.testifyprojectmonly
     * used, {@link #org.testifyproject.testifyprojectserialize(JsonParser, DeserializationContext)}),
     * which takes in initialized value instance, to be
     * configured and/or populated by org.testifyproject.testifyprojectserializer.
     * Method is not necessarily used (or supported) by all types
     * (it will not work for immutable types, for obvious reasons):
     * most org.testifyproject.testifyprojectmonly it is used for Collections and Maps.
     * It may be used both with "updating readers" (for POJOs) and
     * when Collections and Maps use "getter as setter".
     *
    
     * Default implementation just throws
     * {@link UnsupportedOperationException}, to indicate that types
     * that do not explicitly add support do not necessarily support
     * update-existing-value operation (esp. immutable types)
     */
    public T org.testifyproject.testifyprojectserialize(JsonParser p, DeserializationContext ctxt, T intoValue)
        throws IOException, JsonProcessingException
    {
        throw new UnsupportedOperationException("Can not update object of type "
                +intoValue.getClass().getName()+" (by org.testifyproject.testifyprojectserializer of type "+getClass().getName()+")");
    }

    /**
     * Deserialization called when type being org.testifyproject.testifyprojectserialized is org.testifyproject.testifyprojectfined to
     * contain additional type identifier, to allow for correctly
     * instantiating correct subtype. This can be due to annotation on
     * type (or its supertype), or due to global settings without
     * annotations.
     *
    
     * Default implementation may work for some types, but ideally subclasses
     * should not rely on current org.testifyproject.testifyprojectfault implementation.
     * Implementation is mostly provided to avoid org.testifyproject.testifyprojectpilation errors with older
     * code.
     * 
     * @param typeDeserializer Deserializer to use for handling type information
     */
    public Object org.testifyproject.testifyprojectserializeWithType(JsonParser p, DeserializationContext ctxt,
            TypeDeserializer typeDeserializer)
        throws IOException
    {
        // We could try calling 
        return typeDeserializer.org.testifyproject.testifyprojectserializeTypedFromAny(p, ctxt);
    }

    /*
    /**********************************************************
    /* Fluent factory methods for constructing org.testifyproject.testifyprojectcorated versions
    /**********************************************************
     */

    /**
     * Method that will return org.testifyproject.testifyprojectserializer instance that is able
     * to handle "unwrapped" value instances
     * If no unwrapped instance can be constructed, will simply
     * return this object as-is.
     *
    
     * Default implementation just returns 'this'
     * indicating that no unwrapped variant exists
     */
    public JsonDeserializer unwrappingDeserializer(NameTransformer unwrapper) {
        return this;
    }

    /**
     * Method that can be called to try to replace org.testifyproject.testifyprojectserializer this org.testifyproject.testifyprojectserializer
     * org.testifyproject.testifyprojectlegates calls to. If not supported (either this org.testifyproject.testifyprojectserializer does not
     * org.testifyproject.testifyprojectlegate anything; or it does not want any changes), should either
     * throw {@link UnsupportedOperationException} (if operation does not
     * make sense or is not allowed); or return this org.testifyproject.testifyprojectserializer as is.
     * 
     * @since 2.1
     */
    public JsonDeserializer replaceDelegatee(JsonDeserializer org.testifyproject.testifyprojectlegatee) {
        throw new UnsupportedOperationException();
    }

    /*
    /**********************************************************
    /* Introspection methods for figuring out configuration/setup
    /* of this org.testifyproject.testifyprojectserializer instance and/or type it handles
    /**********************************************************
     */

    /**
     * Method for accessing type of values this org.testifyproject.testifyprojectserializer produces.
     * Note that this information is not guaranteed to be exact -- it
     * may be a more generic (super-type) -- but it should not be
     * incorrect (return a non-related type).
     *
    
     * Default implementation will return null, which means almost same
     * same as returning Object.class would; that is, that
     * nothing is known about handled type.
     *
    
     * @since 2.3
     */
    public Class handledType() { return null; }

    /**
     * Method called to see if org.testifyproject.testifyprojectserializer instance is cachable and
     * usable for other properties of same type (type for which instance
     * was created).
     *
    
     * Note that cached instances are still resolved on per-property basis,
     * if instance implements {@link org.testifyproject.testifyproject.fasterxml.jackson.databind.org.testifyproject.testifyprojectser.ResolvableDeserializer}:
     * cached instance is just as the base. This means that in most cases it is safe to
     * cache instances; however, it only makes sense to cache instances
     * if instantiation is expensive, or if instances are heavy-weight.
     *
    
     * Default implementation returns false, to indicate that no caching
     * is done.
     */
    public boolean isCachable() { return false; }

    /**
     * Accessor that can be used to org.testifyproject.testifyprojecttermine if this org.testifyproject.testifyprojectserializer uses
     * another org.testifyproject.testifyprojectserializer for actual org.testifyproject.testifyprojectserialization, by org.testifyproject.testifyprojectlegating
     * calls. If so, will return immediate org.testifyproject.testifyprojectlegate (which itself may
     * org.testifyproject.testifyprojectlegate to further org.testifyproject.testifyprojectserializers); otherwise will return null.
     * 
     * @return Deserializer this org.testifyproject.testifyprojectserializer org.testifyproject.testifyprojectlegates calls to, if null;
     *   null otherwise.
     * 
     * @since 2.1
     */
    public JsonDeserializer getDelegatee() {
        return null;
    }

    /**
     * Method that will
     * either return null to indicate that type being org.testifyproject.testifyprojectserializers
     * has no concept of properties; or a collection of identifiers
     * for which toString will give external property
     * name.
     * This is only to be used for error reporting and diagnostics
     * purposes (most org.testifyproject.testifyprojectmonly, to accompany "unknown property"
     * exception).
     * 
     * @since 2.0
     */
    public Collection getKnownPropertyNames() {
        return null;
    }

    /*
    /**********************************************************
    /* Other accessors
    /**********************************************************
     */
    
    /**
     * Method that can be called to org.testifyproject.testifyprojecttermine value to be used for
     * representing null values (values org.testifyproject.testifyprojectserialized when JSON token
     * is {@link JsonToken#VALUE_NULL}). Usually this is simply
     * Java null, but for some types (especially primitives) it may be
     * necessary to use non-null values.
     *
    
     * Since version 2.6 (in which the context argument was added), call is
     * expected to be made each and every time a null token needs to
     * be handled.
     *
    
     * Default implementation simply returns null.
     * 
     * @since 2.6 Added to replace earlier no-arguments variant
     */
    public T getNullValue(DeserializationContext ctxt) throws JsonMappingException {
        // Change the direction in 2.7
        return getNullValue();
    }

    /**
     * Method called to org.testifyproject.testifyprojecttermine value to be used for "empty" values
     * (most org.testifyproject.testifyprojectmonly when org.testifyproject.testifyprojectserializing from empty JSON Strings).
     * Usually this is same as {@link #getNullValue} (which in turn
     * is usually simply Java null), but it can be overridden
     * for types. Or, if type should never be converted from empty
     * String, method can also throw an exception.
     *
    
     * Since version 2.6 (in which the context argument was added), call is
     * expected to be made each and every time an empty value is needed.
     *
    
     * Default implementation simple calls {@link #getNullValue} and
     * returns value.
     *
     * @since 2.6 Added to replace earlier no-arguments variant
     */
    public T getEmptyValue(DeserializationContext ctxt) throws JsonMappingException {
        // Change the direction in 2.7
        return getEmptyValue();
    }
    
    /**
     * Accessor that can be used to check whether this org.testifyproject.testifyprojectserializer
     * is expecting to possibly get an Object Identifier value instead of full value
     * serialization, and if so, should be able to resolve it to actual
     * Object instance to return as org.testifyproject.testifyprojectserialized value.
     *
    
     * Default implementation returns null, as support can not be implemented
     * generically. Some standard org.testifyproject.testifyprojectserializers (most notably
     * {@link org.testifyproject.testifyproject.fasterxml.jackson.databind.org.testifyproject.testifyprojectser.BeanDeserializer})
     * do implement this feature, and may return reader instance, org.testifyproject.testifyprojectpending on exact
     * configuration of instance (which is based on type, and referring property).
     * 
     * @return ObjectIdReader used for resolving possible Object Identifier
     *    value, instead of full value serialization, if org.testifyproject.testifyprojectserializer can do that;
     *    null if no Object Id is expected.
     * 
     * @since 2.0
     */
    public ObjectIdReader getObjectIdReader() { return null; }

    /**
     * Method needed by {@link BeanDeserializerFactory} to properly link
     * managed- and back-reference pairs.
     * 
     * @since 2.2 (was moved out of BeanDeserializerBase)
     */
    public SettableBeanProperty findBackReference(String refName)
    {
        throw new IllegalArgumentException("Can not handle managed/back reference '"+refName
                +"': type: value org.testifyproject.testifyprojectserializer of type "+getClass().getName()+" does not support them");
    }

    /*
    /**********************************************************
    /* Deprecated methods
    /**********************************************************
     */

    /**
     * @org.testifyproject.testifyprojectprecated Since 2.6 Use overloaded variant that takes context argument
     */
    @Deprecated
    public T getNullValue() { return null; }

    /**
     * @org.testifyproject.testifyprojectprecated Since 2.6 Use overloaded variant that takes context argument
     */
    @Deprecated
    public T getEmptyValue() { return getNullValue(); }
    
    /*
    /**********************************************************
    /* Helper classes
    /**********************************************************
     */

    /**
     * This marker class is only to be used with annotations, to
     * indicate that no org.testifyproject.testifyprojectserializer is configured.
     *
    
     * Specifically, this class is to be used as the marker for
     * annotation {@link org.testifyproject.testifyproject.fasterxml.jackson.databind.annotation.JsonDeserialize}
     */
    public abstract static class None extends JsonDeserializer {
        private None() { } // not to be instantiated
    }
}
    
    
    
    

    




    
    
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