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/BooleanNode.java

    package com.fasterxml.jackson.databind.node;
    
    import java.io.IOException;
    
    import com.fasterxml.jackson.core.*;
    import com.fasterxml.jackson.databind.SerializerProvider;
    
    
    /**
     * This concrete value class is used to contain boolean (true / false)
     * values. Only two instances are ever created, to minimize memory
     * usage.
     */
    public class BooleanNode
        extends ValueNode
    {
        private static final long serialVersionUID = 2L;
    
        // // Just need two instances...
    
        public final static BooleanNode TRUE = new BooleanNode(true);
        public final static BooleanNode FALSE = new BooleanNode(false);
    
        private final boolean _value;
    
        /**
         *<p>
         * NOTE: visibility raised to `protected` in 2.9.3 to allow custom subtypes.
         */
        protected BooleanNode(boolean v) { _value = v; }
    
        // To support JDK serialization, recovery of Singleton instance
        protected Object readResolve() {
            return _value ? TRUE : FALSE;
        }
    
        public static BooleanNode getTrue() { return TRUE; }
        public static BooleanNode getFalse() { return FALSE; }
    
        public static BooleanNode valueOf(boolean b) { return b ? TRUE : FALSE; }
    
        @Override
        public JsonNodeType getNodeType() {
            return JsonNodeType.BOOLEAN;
        }
    
        @Override public JsonToken asToken() {
            return _value ? JsonToken.VALUE_TRUE : JsonToken.VALUE_FALSE;
        }
    
        @Override
        public boolean booleanValue() {
            return _value;
        }
    
        @Override
        public String asText() {
            return _value ? "true" : "false";
        }
    
        @Override
        public boolean asBoolean() {
            return _value;
        }
    
        @Override
        public boolean asBoolean(boolean defaultValue) {
            return _value;
        }
        
        @Override
        public int asInt(int defaultValue) {
            return _value ? 1 : 0;
        }
        @Override
        public long asLong(long defaultValue) {
            return _value ? 1L : 0L;
        }
        @Override
        public double asDouble(double defaultValue) {
            return _value ? 1.0 : 0.0;
        }
        
        @Override
        public final void serialize(JsonGenerator g, SerializerProvider provider) throws IOException {
            g.writeBoolean(_value);
        }
    
        @Override
        public int hashCode() {
            return _value ? 3 : 1;
        }
    
        @Override
        public boolean equals(Object o)
        {
            /* 11-Mar-2013, tatu: Apparently ClassLoaders can manage to load
             *    different instances, rendering identity comparisons broken.
             *    So let's use value instead.
             */
            if (o == this) return true;
            if (o == null) return false;
            if (!(o instanceof BooleanNode)) {
                return false;
            }
            return (_value == ((BooleanNode) o)._value);
        }
    }
    

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

     

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    2022-03-29, 31879👍, 0💬