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-2.14.0-sources.jar). You can download it at Jackson Maven Website.

You can also browse Jackson Databind Source Code below:

⏎ com/fasterxml/jackson/databind/cfg/DeserializerFactoryConfig.java

package com.fasterxml.jackson.databind.cfg;

import com.fasterxml.jackson.databind.AbstractTypeResolver;
import com.fasterxml.jackson.databind.deser.*;
import com.fasterxml.jackson.databind.deser.std.StdKeyDeserializers;
import com.fasterxml.jackson.databind.util.ArrayBuilders;
import com.fasterxml.jackson.databind.util.ArrayIterator;

/**
 * Configuration settings container class for {@link DeserializerFactory}.
 */
public class DeserializerFactoryConfig
    implements java.io.Serializable // since 2.1
{
    private static final long serialVersionUID = 1L; // since 2.5

    protected final static Deserializers[] NO_DESERIALIZERS = new Deserializers[0];
    protected final static BeanDeserializerModifier[] NO_MODIFIERS = new BeanDeserializerModifier[0];
    protected final static AbstractTypeResolver[] NO_ABSTRACT_TYPE_RESOLVERS = new AbstractTypeResolver[0];
    protected final static ValueInstantiators[] NO_VALUE_INSTANTIATORS = new ValueInstantiators[0];

    /**
     * By default we plug default key deserializers using as "just another" set of
     * of key deserializers.
     * 
     * @since 2.2
     */
    protected final static KeyDeserializers[] DEFAULT_KEY_DESERIALIZERS = new KeyDeserializers[] {
        new StdKeyDeserializers()
    };
    
    /**
     * List of providers for additional deserializers, checked before considering default
     * basic or bean deserializers.
     */
    protected final Deserializers[] _additionalDeserializers;

    /**
     * List of providers for additional key deserializers, checked before considering
     * standard key deserializers.
     */
    protected final KeyDeserializers[] _additionalKeyDeserializers;
    
    /**
     * List of modifiers that can change the way {@link BeanDeserializer} instances
     * are configured and constructed.
     */
    protected final BeanDeserializerModifier[] _modifiers;

    /**
     * List of objects that may be able to resolve abstract types to
     * concrete types. Used by functionality like "mr Bean" to materialize
     * types as needed.
     */
    protected final AbstractTypeResolver[] _abstractTypeResolvers;

    /**
     * List of objects that know how to create instances of POJO types;
     * possibly using custom construction (non-annoted constructors; factory
     * methods external to value type etc).
     * Used to support objects that are created using non-standard methods;
     * or to support post-constructor functionality.
     */
    protected final ValueInstantiators[] _valueInstantiators;

    /**
     * Constructor for creating basic configuration with no additional
     * handlers.
     */
    public DeserializerFactoryConfig() {
        this(null, null, null, null, null);
    }

    /**
     * Copy-constructor that will create an instance that contains defined
     * set of additional deserializer providers.
     */
    protected DeserializerFactoryConfig(Deserializers[] allAdditionalDeserializers,
            KeyDeserializers[] allAdditionalKeyDeserializers,
            BeanDeserializerModifier[] modifiers,
            AbstractTypeResolver[] atr,
            ValueInstantiators[] vi)
    {
        _additionalDeserializers = (allAdditionalDeserializers == null) ?
                NO_DESERIALIZERS : allAdditionalDeserializers;
        _additionalKeyDeserializers = (allAdditionalKeyDeserializers == null) ?
                DEFAULT_KEY_DESERIALIZERS : allAdditionalKeyDeserializers;
        _modifiers = (modifiers == null) ? NO_MODIFIERS : modifiers;
        _abstractTypeResolvers = (atr == null) ? NO_ABSTRACT_TYPE_RESOLVERS : atr;
        _valueInstantiators = (vi == null) ? NO_VALUE_INSTANTIATORS : vi;
    }

    /**
     * Fluent/factory method used to construct a configuration object that
     * has same deserializer providers as this instance, plus one specified
     * as argument. Additional provider will be added before existing ones,
     * meaning it has priority over existing definitions.
     */
    public DeserializerFactoryConfig withAdditionalDeserializers(Deserializers additional)
    {
        if (additional == null) {
            throw new IllegalArgumentException("Cannot pass null Deserializers");
        }
        Deserializers[] all = ArrayBuilders.insertInListNoDup(_additionalDeserializers, additional);
        return new DeserializerFactoryConfig(all, _additionalKeyDeserializers, _modifiers,
                _abstractTypeResolvers, _valueInstantiators);
    }

    /**
     * Fluent/factory method used to construct a configuration object that
     * has same key deserializer providers as this instance, plus one specified
     * as argument. Additional provider will be added before existing ones,
     * meaning it has priority over existing definitions.
     */
    public DeserializerFactoryConfig withAdditionalKeyDeserializers(KeyDeserializers additional)
    {
        if (additional == null) {
            throw new IllegalArgumentException("Cannot pass null KeyDeserializers");
        }
        KeyDeserializers[] all = ArrayBuilders.insertInListNoDup(_additionalKeyDeserializers, additional);
        return new DeserializerFactoryConfig(_additionalDeserializers, all, _modifiers,
                _abstractTypeResolvers, _valueInstantiators);
    }

    /**
     * Fluent/factory method used to construct a configuration object that
     * has same configuration as this instance plus one additional
     * deserialiazer modifier. Added modifier has the highest priority (that is, it
     * gets called before any already registered modifier).
     */
    public DeserializerFactoryConfig withDeserializerModifier(BeanDeserializerModifier modifier)
    {
        if (modifier == null) {
            throw new IllegalArgumentException("Cannot pass null modifier");
        }
        BeanDeserializerModifier[] all = ArrayBuilders.insertInListNoDup(_modifiers, modifier);
        return new DeserializerFactoryConfig(_additionalDeserializers, _additionalKeyDeserializers, all,
                _abstractTypeResolvers, _valueInstantiators);
    }

    /**
     * Fluent/factory method used to construct a configuration object that
     * has same configuration as this instance plus one additional
     * abstract type resolver.
     * Added resolver has the highest priority (that is, it
     * gets called before any already registered resolver).
     */
    public DeserializerFactoryConfig withAbstractTypeResolver(AbstractTypeResolver resolver)
    {
        if (resolver == null) {
            throw new IllegalArgumentException("Cannot pass null resolver");
        }
        AbstractTypeResolver[] all = ArrayBuilders.insertInListNoDup(_abstractTypeResolvers, resolver);
        return new DeserializerFactoryConfig(_additionalDeserializers, _additionalKeyDeserializers, _modifiers,
                all, _valueInstantiators);
    }

    /**
     * Fluent/factory method used to construct a configuration object that
     * has same configuration as this instance plus specified additional
     * value instantiator provider object.
     * Added instantiator provider has the highest priority (that is, it
     * gets called before any already registered resolver).
     * 
     * @param instantiators Object that can provide {@link com.fasterxml.jackson.databind.deser.ValueInstantiator}s for
     *    constructing POJO values during deserialization
     */
    public DeserializerFactoryConfig withValueInstantiators(ValueInstantiators instantiators) 
    {
        if (instantiators == null) {
            throw new IllegalArgumentException("Cannot pass null resolver");
        }
        ValueInstantiators[] all = ArrayBuilders.insertInListNoDup(_valueInstantiators, instantiators);
        return new DeserializerFactoryConfig(_additionalDeserializers, _additionalKeyDeserializers, _modifiers,
                _abstractTypeResolvers, all);
    }
    
    public boolean hasDeserializers() { return _additionalDeserializers.length > 0; }

    public boolean hasKeyDeserializers() { return _additionalKeyDeserializers.length > 0; }
    
    public boolean hasDeserializerModifiers() { return _modifiers.length > 0; }

    public boolean hasAbstractTypeResolvers() { return _abstractTypeResolvers.length > 0; }

    public boolean hasValueInstantiators() { return _valueInstantiators.length > 0; }
    
    public Iterable<Deserializers> deserializers() {
        return new ArrayIterator<Deserializers>(_additionalDeserializers);
    }

    public Iterable<KeyDeserializers> keyDeserializers() {
        return new ArrayIterator<KeyDeserializers>(_additionalKeyDeserializers);
    }
    
    public Iterable<BeanDeserializerModifier> deserializerModifiers() {
        return new ArrayIterator<BeanDeserializerModifier>(_modifiers);
    }

    public Iterable<AbstractTypeResolver> abstractTypeResolvers() {
        return new ArrayIterator<AbstractTypeResolver>(_abstractTypeResolvers);
    }

    public Iterable<ValueInstantiators> valueInstantiators() {
        return new ArrayIterator<ValueInstantiators>(_valueInstantiators);
    }
}

⏎ com/fasterxml/jackson/databind/cfg/DeserializerFactoryConfig.java

Or download all of them as a single archive file:

File name: jackson-databind-2.14.0-sources.jar
File size: 1187952 bytes
Release date: 2022-11-05
Download 

⇒ Jackson Annotations Source Code

⇐ Download and Install Jackson Binary Package

⇑ Downloading and Reviewing jackson-*.jar

⇑⇑ Jackson - Java JSON library