Jackson Annotations Source Code

Jackson is "the Java JSON library" or "the best JSON parser for Java". Or simply as "JSON for Java".

Jackson Annotations Source Code files are provided in the source packge (jackson-annotations-2.12.4-sources.jar). You can download it at Jackson Maven Website.

You can also browse Jackson Annotations Source Code below:

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

import java.io.IOException;

import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.databind.DatabindContext;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.cfg.MapperConfig;
import com.fasterxml.jackson.databind.jsontype.PolymorphicTypeValidator;
import com.fasterxml.jackson.databind.type.TypeFactory;

public class MinimalClassNameIdResolver
    extends ClassNameIdResolver
     * Package name of the base class, to be used for determining common
     * prefix that can be omitted from included type id.
     * Does not include the trailing dot.
    protected final String _basePackageName;

     * Same as {@link #_basePackageName}, but includes trailing dot.
    protected final String _basePackagePrefix;

    protected MinimalClassNameIdResolver(JavaType baseType, TypeFactory typeFactory,
            PolymorphicTypeValidator ptv)
        super(baseType, typeFactory, ptv);
        String base = baseType.getRawClass().getName();
        int ix = base.lastIndexOf('.');
        if (ix < 0) { // can this ever occur?
            _basePackageName = "";
            _basePackagePrefix = ".";
        } else {
            _basePackagePrefix = base.substring(0, ix+1);
            _basePackageName = base.substring(0, ix);

    public static MinimalClassNameIdResolver construct(JavaType baseType, MapperConfig<?> config,
            PolymorphicTypeValidator ptv) {
        return new MinimalClassNameIdResolver(baseType, config.getTypeFactory(), ptv);

    public JsonTypeInfo.Id getMechanism() { return JsonTypeInfo.Id.MINIMAL_CLASS; }
    public String idFromValue(Object value)
        String n = value.getClass().getName();
        if (n.startsWith(_basePackagePrefix)) {
            // note: we will leave the leading dot in there
            return n.substring(_basePackagePrefix.length()-1);
        return n;

    protected JavaType _typeFromId(String id, DatabindContext ctxt) throws IOException
        if (id.startsWith(".")) {
            StringBuilder sb = new StringBuilder(id.length() + _basePackageName.length());
            if  (_basePackageName.isEmpty()) {
                // no package; must remove leading '.' from id
            } else {
                // otherwise just concatenate package, with leading-dot-partial name
            id = sb.toString();
        return super._typeFromId(id, ctxt);



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2022-02-19, 36158👍, 0💬