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/type/PlaceholderForType.java

package com.fasterxml.jackson.databind.type;

import com.fasterxml.jackson.databind.JavaType;

/**
 * Helper type used when introspecting bindings for already resolved types,
 * needed for specialization.
 *
 * @since 2.8.11
 */
public class PlaceholderForType extends TypeBase
{
    private static final long serialVersionUID = 1L;

    protected final int _ordinal;

    /**
     * Type assigned during wildcard resolution (which follows type
     * structure resolution)
     */
    protected JavaType _actualType;
    
    public PlaceholderForType(int ordinal)
    {
        super(Object.class, TypeBindings.emptyBindings(),
                TypeFactory.unknownType(), null, 1, // super-class, super-interfaces, hashCode
                null, null, false); // value/type handler, as-static
        _ordinal = ordinal;
    }

    public JavaType actualType() { return _actualType; }
    public void actualType(JavaType t) { _actualType = t; }

    // Override to get better diagnostics
    @Override
    protected String buildCanonicalName() {
        return toString();
    }

    @Override
    public StringBuilder getGenericSignature(StringBuilder sb) {
        return getErasedSignature(sb);
    }

    @Override
    public StringBuilder getErasedSignature(StringBuilder sb) {
        sb.append('$').append(_ordinal+1);
        return sb;
    }

    @Override
    public JavaType withTypeHandler(Object h) {
        return _unsupported();
    }

    @Override
    public JavaType withContentTypeHandler(Object h) {
        return _unsupported();
    }

    @Override
    public JavaType withValueHandler(Object h) {
        return _unsupported();
    }

    @Override
    public JavaType withContentValueHandler(Object h) {
        return _unsupported();
    }

    @Override
    public JavaType withContentType(JavaType contentType) {
        return _unsupported();
    }

    @Override
    public JavaType withStaticTyping() {
        return _unsupported();
    }

    @Override
    public JavaType refine(Class<?> rawType, TypeBindings bindings, JavaType superClass, JavaType[] superInterfaces) {
        return _unsupported();
    }

    @Override
    @Deprecated // since 2.7
    protected JavaType _narrow(Class<?> subclass) {
        return _unsupported();
    }

    @Override
    public boolean isContainerType() {
        return false;
    }

    @Override
    public String toString() {
        return getErasedSignature(new StringBuilder()).toString();
    }

    @Override
    public boolean equals(Object o) {
        return (o == this);
    }

    private <T> T _unsupported() {
        throw new UnsupportedOperationException("Operation should not be attempted on "+getClass().getName());
    }
}

⏎ com/fasterxml/jackson/databind/type/PlaceholderForType.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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