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/ser/std/ToStringSerializerBase.java

package com.fasterxml.jackson.databind.ser.std;

import java.io.IOException;
import java.lang.reflect.Type;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonToken;
import com.fasterxml.jackson.core.type.WritableTypeId;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonFormatVisitorWrapper;
import com.fasterxml.jackson.databind.jsontype.TypeSerializer;

/**
 * Intermediate base class that serves as base for standard {@link ToStringSerializer}
 * as well as for custom subtypes that want to add processing for converting from
 * value to output into its {@code String} representation (whereas standard version
 * simply calls value object's {@code toString()} method).
 *
 * @since 2.10
 */
@SuppressWarnings("serial")
public abstract class ToStringSerializerBase
    extends StdSerializer<Object>
{
    public ToStringSerializerBase(Class<?> handledType) {
        super(handledType, false);
    }

    @Override
    public boolean isEmpty(SerializerProvider prov, Object value) {
        return valueToString(value).isEmpty();
    }

    @Override
    public void serialize(Object value, JsonGenerator gen, SerializerProvider provider)
        throws IOException
    {
        gen.writeString(valueToString(value));
    }

    /**
     * Default implementation will write type prefix, call regular serialization
     * method (since assumption is that value itself does not need JSON
     * Array or Object start/end markers), and then write type suffix.
     * This should work for most cases; some sub-classes may want to
     * change this behavior.
     */
    @Override
    public void serializeWithType(Object value, JsonGenerator g, SerializerProvider provider,
            TypeSerializer typeSer)
        throws IOException
    {
        WritableTypeId typeIdDef = typeSer.writeTypePrefix(g,
                typeSer.typeId(value, JsonToken.VALUE_STRING));
        serialize(value, g, provider);
        typeSer.writeTypeSuffix(g, typeIdDef);
    }

    @Override
    public JsonNode getSchema(SerializerProvider provider, Type typeHint) throws JsonMappingException {
        return createSchemaNode("string", true);
    }

    @Override
    public void acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor, JavaType typeHint) throws JsonMappingException
    {
        visitStringFormat(visitor, typeHint);
    }

    public abstract String valueToString(Object value);
}

⏎ com/fasterxml/jackson/databind/ser/std/ToStringSerializerBase.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
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⇑⇑ Jackson - Java JSON library