Jackson Data Binding Source Code

Jackson is "the Java JSON library" or "the best JSON parser for Java". Or simply as "JSON for Java".

  • Jackson Data Binding module allows you to converts JSON to and from POJO (Plain Old Java Object) using property accessor or using annotations.
  • Jackson Databind Source Code files are provided in the source packge (jackson-databind-2.12.4-sources.jar). You can download it at Jackson Maven Website.

    You can also browse Jackson Databind Source Code below:

    ✍: FYIcenter.com

    com/fasterxml/jackson/databind/deser/std/NullifyingDeserializer.java

    package com.fasterxml.jackson.databind.deser.std;
    
    import java.io.IOException;
    
    import com.fasterxml.jackson.core.*;
    import com.fasterxml.jackson.databind.*;
    import com.fasterxml.jackson.databind.jsontype.TypeDeserializer;
    
    /**
     * Bogus deserializer that will simply skip all content there is to map
     * and returns Java null reference.
     *
     * @since 2.2
     */
    public class NullifyingDeserializer
        extends StdDeserializer<Object>
    {
        private static final long serialVersionUID = 1L;
    
        public final static NullifyingDeserializer instance = new NullifyingDeserializer();
        
        public NullifyingDeserializer() { super(Object.class); }
    
        /*
        /**********************************************************
        /* Deserializer API
        /**********************************************************
         */
    
        @Override // since 2.9
        public Boolean supportsUpdate(DeserializationConfig config) {
            return Boolean.FALSE;
        }
    
        @Override
        public Object deserialize(JsonParser p, DeserializationContext ctxt) throws IOException
        {
            // 29-Jan-2016, tatu: Simple skipping for all other tokens, but FIELD_NAME bit
            //    special unfortunately
            if (p.hasToken(JsonToken.FIELD_NAME)) {
                while (true) {
                    JsonToken t = p.nextToken();
                    if ((t == null) || (t == JsonToken.END_OBJECT)) {
                        break;
                    }
                    p.skipChildren();
                }
            } else {
                p.skipChildren();
            }
            return null;
        }
    
        @Override
        public Object deserializeWithType(JsonParser p, DeserializationContext ctxt,
                TypeDeserializer typeDeserializer) throws IOException
        {
            // Not sure if we need to bother but:
    
            switch (p.currentTokenId()) {
            case JsonTokenId.ID_START_ARRAY:
            case JsonTokenId.ID_START_OBJECT:
            case JsonTokenId.ID_FIELD_NAME:
                return typeDeserializer.deserializeTypedFromAny(p, ctxt);
            default:
                return null;
            }
        }
    }
    

    com/fasterxml/jackson/databind/deser/std/NullifyingDeserializer.java

     

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    2022-03-29, 32111👍, 0💬