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/impl/IndexedStringListSerializer.java

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

import java.io.IOException;
import java.util.*;

import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.core.type.WritableTypeId;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.annotation.JacksonStdImpl;
import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonArrayFormatVisitor;
import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonFormatTypes;
import com.fasterxml.jackson.databind.jsontype.TypeSerializer;
import com.fasterxml.jackson.databind.ser.std.StaticListSerializerBase;

/**
 * Efficient implement for serializing {@link List}s that contains Strings and are random-accessible.
 * The only complexity is due to possibility that serializer for {@link String}
 * may be overridde; because of this, logic is needed to ensure that the default
 * serializer is in use to use fastest mode, or if not, to defer to custom
 * String serializer.
 */
@JacksonStdImpl
public final class IndexedStringListSerializer
    extends StaticListSerializerBase<List<String>>
{
    private static final long serialVersionUID = 1L;

    public final static IndexedStringListSerializer instance = new IndexedStringListSerializer();

    /*
    /**********************************************************
    /* Life-cycle
    /**********************************************************
     */
    
    protected IndexedStringListSerializer() {
        super(List.class);
    }

    public IndexedStringListSerializer(IndexedStringListSerializer src,
            Boolean unwrapSingle) {
        super(src, unwrapSingle);
    }

    @Override
    public JsonSerializer<?> _withResolved(BeanProperty prop, Boolean unwrapSingle) {
        return new IndexedStringListSerializer(this, unwrapSingle);
    }
    
    @Override protected JsonNode contentSchema() { return createSchemaNode("string", true); }

    @Override
    protected void acceptContentVisitor(JsonArrayFormatVisitor visitor) throws JsonMappingException {
        visitor.itemsFormat(JsonFormatTypes.STRING);
    }

    /*
    /**********************************************************
    /* Actual serialization
    /**********************************************************
     */

    @Override
    public void serialize(List<String> value, JsonGenerator g,
            SerializerProvider provider) throws IOException
    {
        final int len = value.size();
        if (len == 1) {
            if (((_unwrapSingle == null) &&
                    provider.isEnabled(SerializationFeature.WRITE_SINGLE_ELEM_ARRAYS_UNWRAPPED))
                    || (_unwrapSingle == Boolean.TRUE)) {
                serializeContents(value, g, provider, 1);
                return;
            }
        }
        g.writeStartArray(value, len);
        serializeContents(value, g, provider, len);
        g.writeEndArray();
    }

    @Override
    public void serializeWithType(List<String> value, JsonGenerator g, SerializerProvider provider,
            TypeSerializer typeSer)
        throws IOException
    {
        WritableTypeId typeIdDef = typeSer.writeTypePrefix(g,
                typeSer.typeId(value, JsonToken.START_ARRAY));
        g.setCurrentValue(value);
        serializeContents(value, g, provider, value.size());
        typeSer.writeTypeSuffix(g, typeIdDef);
    }

    private final void serializeContents(List<String> value, JsonGenerator g,
            SerializerProvider provider, int len) throws IOException
    {
        int i = 0;
        try {
            for (; i < len; ++i) {
                String str = value.get(i);
                if (str == null) {
                    provider.defaultSerializeNull(g);
                } else {
                    g.writeString(str);
                }
            }
        } catch (Exception e) {
            wrapAndThrow(provider, e, value, i);
        }
    }
}

⏎ com/fasterxml/jackson/databind/ser/impl/IndexedStringListSerializer.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

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⇑⇑ Jackson - Java JSON library