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/TypeSerializerBase.java

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

import java.io.IOException;

import com.fasterxml.jackson.annotation.JsonTypeInfo;

import com.fasterxml.jackson.core.JsonGenerator;

import com.fasterxml.jackson.core.type.WritableTypeId;
import com.fasterxml.jackson.databind.BeanProperty;
import com.fasterxml.jackson.databind.jsontype.TypeIdResolver;
import com.fasterxml.jackson.databind.jsontype.TypeSerializer;

public abstract class TypeSerializerBase extends TypeSerializer
{
    protected final TypeIdResolver _idResolver;

    protected final BeanProperty _property;

    protected TypeSerializerBase(TypeIdResolver idRes, BeanProperty property)
    {
        _idResolver = idRes;
        _property = property;
    }

    /*
    /**********************************************************
    /* Base implementations, simple accessors
    /**********************************************************
     */

    @Override
    public abstract JsonTypeInfo.As getTypeInclusion();

    @Override
    public String getPropertyName() { return null; }
    
    @Override
    public TypeIdResolver getTypeIdResolver() { return _idResolver; }

    @Override
    public WritableTypeId writeTypePrefix(JsonGenerator g,
            WritableTypeId idMetadata) throws IOException
    {
        _generateTypeId(idMetadata);
        return g.writeTypePrefix(idMetadata);
    }

    @Override
    public WritableTypeId writeTypeSuffix(JsonGenerator g,
            WritableTypeId idMetadata) throws IOException
    {
        return g.writeTypeSuffix(idMetadata);
    }

    /**
     * Helper method that will generate type id to use, if not already passed.
     *
     * @since 2.9
     */
    protected void _generateTypeId(WritableTypeId idMetadata) {
        Object id = idMetadata.id;
        if (id == null) {
            final Object value = idMetadata.forValue;
            Class<?> typeForId = idMetadata.forValueType;
            if (typeForId == null) {
                id = idFromValue(value);
            } else {
                id = idFromValueAndType(value, typeForId);
            }
            idMetadata.id = id;
        }
    }

    /*
    /**********************************************************
    /* Helper methods for subclasses
    /**********************************************************
     */

    protected String idFromValue(Object value) {
        String id = _idResolver.idFromValue(value);
        if (id == null) {
            handleMissingId(value);
        }
        return id;
    }

    protected String idFromValueAndType(Object value, Class<?> type) {
        String id = _idResolver.idFromValueAndType(value, type);
        if (id == null) {
            handleMissingId(value);
        }
        return id;
    }

    // As per [databind#633], maybe better just not do anything...
    protected void handleMissingId(Object value) {
        /*
        String typeDesc = ClassUtil.classNameOf(value, "NULL");
        throw new IllegalArgumentException("Cannot resolve type id for "
                +typeDesc+" (using "+_idResolver.getClass().getName()+")");
                */
    }
}

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

 

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