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

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:

⏎ 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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