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/node/ValueNode.java

    package com.fasterxml.jackson.databind.node;
    
    import java.io.IOException;
    import java.util.List;
    
    import com.fasterxml.jackson.core.*;
    import com.fasterxml.jackson.core.type.WritableTypeId;
    import com.fasterxml.jackson.databind.JsonNode;
    import com.fasterxml.jackson.databind.SerializerProvider;
    import com.fasterxml.jackson.databind.jsontype.TypeSerializer;
    
    /**
     * This intermediate base class is used for all leaf nodes, that is,
     * all non-container (array or object) nodes, except for the
     * "missing node".
     */
    public abstract class ValueNode
        extends BaseJsonNode
    {
        private static final long serialVersionUID = 1L;
    
        protected ValueNode() { }
    
        @Override
        protected JsonNode _at(JsonPointer ptr) {
            // 02-Jan-2020, tatu: As per [databind#3005] must return `null` and NOT
            //    "missing node"
            return null;
        }
    
        /**
         * All current value nodes are immutable, so we can just return
         * them as is.
         */
        @SuppressWarnings("unchecked")
        @Override
        public <T extends JsonNode> T deepCopy() { return (T) this; }
        
        @Override public abstract JsonToken asToken();
    
        @Override
        public void serializeWithType(JsonGenerator g, SerializerProvider provider,
                TypeSerializer typeSer)
            throws IOException
        {
            WritableTypeId typeIdDef = typeSer.writeTypePrefix(g,
                    typeSer.typeId(this, asToken()));
            serialize(g, provider);
            typeSer.writeTypeSuffix(g, typeIdDef);
        }
    
        /*
        /**********************************************************************
        /* Basic property access
        /**********************************************************************
         */
    
        @Override
        public boolean isEmpty() { return true; }
        
        /*
        /**********************************************************************
        /* Navigation methods
        /**********************************************************************
         */
    
        @Override
        public final JsonNode get(int index) { return null; }
    
        @Override
        public final JsonNode path(int index) { return MissingNode.getInstance(); }
    
        @Override
        public final boolean has(int index) { return false; }
    
        @Override
        public final boolean hasNonNull(int index) { return false; }
    
        @Override
        public final JsonNode get(String fieldName) { return null; }
    
        @Override
        public final JsonNode path(String fieldName) { return MissingNode.getInstance(); }
    
        @Override
        public final boolean has(String fieldName) { return false; }
    
        @Override
        public final boolean hasNonNull(String fieldName) { return false; }
    
        /*
         **********************************************************************
         * Find methods: all "leaf" nodes return the same for these
         **********************************************************************
         */
    
        @Override
        public final JsonNode findValue(String fieldName) {
            return null;
        }
    
        // note: co-variant return type
        @Override
        public final ObjectNode findParent(String fieldName) {
            return null;
        }
    
        @Override
        public final List<JsonNode> findValues(String fieldName, List<JsonNode> foundSoFar) {
            return foundSoFar;
        }
    
        @Override
        public final List<String> findValuesAsText(String fieldName, List<String> foundSoFar) {
            return foundSoFar;
        }
    
        @Override
        public final List<JsonNode> findParents(String fieldName, List<JsonNode> foundSoFar) {
            return foundSoFar;
        }
    }
    

    com/fasterxml/jackson/databind/node/ValueNode.java

     

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    ⇑⇑ Jackson - Java JSON library

    2022-03-29, 32270👍, 0💬