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/POJONode.java

    package com.fasterxml.jackson.databind.node;
    
    import java.io.IOException;
    
    import com.fasterxml.jackson.core.*;
    import com.fasterxml.jackson.databind.JsonSerializable;
    import com.fasterxml.jackson.databind.SerializerProvider;
    
    /**
     * Value node that contains a wrapped POJO, to be serialized as
     * a JSON constructed through data mapping (usually done by
     * calling {@link com.fasterxml.jackson.databind.ObjectMapper}).
     */
    public class POJONode
        extends ValueNode
    {
        private static final long serialVersionUID = 2L;
    
        protected final Object _value;
    
        public POJONode(Object v) { _value = v; }
    
        /*
        /**********************************************************
        /* Base class overrides
        /**********************************************************
         */
    
        @Override
        public JsonNodeType getNodeType() {
            return JsonNodeType.POJO;
        }
    
        @Override public JsonToken asToken() { return JsonToken.VALUE_EMBEDDED_OBJECT; }
    
        /**
         * As it is possible that some implementations embed byte[] as POJONode
         * (despite optimal being {@link BinaryNode}), let's add support for exposing
         * binary data here too.
         */
        @Override
        public byte[] binaryValue() throws IOException
        {
            if (_value instanceof byte[]) {
                return (byte[]) _value;
            }
            return super.binaryValue();
        }
        
        /* 
        /**********************************************************
        /* General type coercions
        /**********************************************************
         */
    
        @Override
        public String asText() { return (_value == null) ? "null" : _value.toString(); }
    
        @Override public String asText(String defaultValue) {
            return (_value == null) ? defaultValue : _value.toString();
        }
        
        @Override
        public boolean asBoolean(boolean defaultValue)
        {
            if (_value != null && _value instanceof Boolean) {
                return ((Boolean) _value).booleanValue();
            }
            return defaultValue;
        }
        
        @Override
        public int asInt(int defaultValue)
        {
            if (_value instanceof Number) {
                return ((Number) _value).intValue();
            }
            return defaultValue;
        }
    
        @Override
        public long asLong(long defaultValue)
        {
            if (_value instanceof Number) {
                return ((Number) _value).longValue();
            }
            return defaultValue;
        }
        
        @Override
        public double asDouble(double defaultValue)
        {
            if (_value instanceof Number) {
                return ((Number) _value).doubleValue();
            }
            return defaultValue;
        }
        
        /*
        /**********************************************************
        /* Public API, serialization
        /**********************************************************
         */
    
        @Override
        public final void serialize(JsonGenerator gen, SerializerProvider ctxt) throws IOException
        {
            if (_value == null) {
                ctxt.defaultSerializeNull(gen);
            } else if (_value instanceof JsonSerializable) {
                ((JsonSerializable) _value).serialize(gen, ctxt);
            } else {
                // 25-May-2018, tatu: [databind#1991] do not call via generator but through context;
                //    this to preserve contextual information
                ctxt.defaultSerializeValue(_value, gen);
            }
        }
    
        /*
        /**********************************************************
        /* Extended API
        /**********************************************************
         */
    
        /**
         * Method that can be used to access the POJO this node wraps.
         */
        public Object getPojo() { return _value; }
    
        /*
        /**********************************************************
        /* Overridden standard methods
        /**********************************************************
         */
    
        @Override
        public boolean equals(Object o)
        {
            if (o == this) return true;
            if (o == null) return false;
            if (o instanceof POJONode) {
                return _pojoEquals((POJONode) o);
            }
            return false;
        }
    
        /**
         * @since 2.3
         */
        protected boolean _pojoEquals(POJONode other)
        {
            if (_value == null) {
                return other._value == null;
            }
            return _value.equals(other._value);
        }
        
        @Override
        public int hashCode() { return _value.hashCode(); }
    }
    

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

     

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    2022-03-29, 31947👍, 0💬