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/jsontype/impl/LaissezFaireSubTypeValidator.java

package com.fasterxml.jackson.databind.jsontype.impl;

import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.cfg.MapperConfig;
import com.fasterxml.jackson.databind.jsontype.PolymorphicTypeValidator;

/**
 * Default {@link PolymorphicTypeValidator} used unless explicit one is constructed
 * (and, in 2.11, {@link com.fasterxml.jackson.databind.MapperFeature#BLOCK_UNSAFE_POLYMORPHIC_BASE_TYPES}
 * not enabled).
 * Does not do any validation, allows all subtypes. Only used for backwards-compatibility
 * reasons: users should usually NOT use such a permissive implementation but use
 * allow-list/criteria - based implementation.
 *
 * @since 2.10
 */
public final class LaissezFaireSubTypeValidator
    extends PolymorphicTypeValidator.Base
{
    private static final long serialVersionUID = 1L;

    public final static LaissezFaireSubTypeValidator instance = new LaissezFaireSubTypeValidator(); 

    @Override
    public Validity validateBaseType(MapperConfig<?> ctxt, JavaType baseType) {
        return Validity.INDETERMINATE;
    }

    @Override
    public Validity validateSubClassName(MapperConfig<?> ctxt,
            JavaType baseType, String subClassName) {
        return Validity.ALLOWED;
    }

    @Override
    public Validity validateSubType(MapperConfig<?> ctxt, JavaType baseType,
            JavaType subType) {
        return Validity.ALLOWED;
    }
}

⏎ com/fasterxml/jackson/databind/jsontype/impl/LaissezFaireSubTypeValidator.java

 

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