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  * Copyright (c) 2013, Francis Galiegue <>
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the Lesser GNU General Public License as
  * published by the Free Software Foundation, either version 3 of the
  * License, or (at your option) any later version.
  * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * Lesser GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <>.
package com.github.fge.jsonschema.keyword.digest.helpers;
A digester returning a com.fasterxml.jackson.databind.node.NullNode for any input

This is actually useful for keywords like anyOf, allOf and oneOf, which only roles are to validate subschemas: they do not need a digested form at all, they just have to peek at the schema.

A net result of all keywords using this digester is that only one instance will ever be built.

public final class NullDigester
    extends AbstractDigester
    public NullDigester(final String keywordfinal NodeType first,
        final NodeType... other)
    public JsonNode digest(final JsonNode schema)
        return .nullNode();
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