/*
* Copyright (c) 2014, Francis Galiegue (fgaliegue@gmail.com)
*
* This software is dual-licensed under:
*
* - the Lesser General Public License (LGPL) version 3.0 or, at your option, any
* later version;
* - the Apache Software License (ASL) version 2.0.
*
* The text of this file and of both licenses is available at the root of this
* project or, if you have the jar distribution, in directory META-INF/, under
* the names LGPL-3.0.txt and ASL-2.0.txt respectively.
*
* Direct link to the sources:
*
* - LGPL 3.0: https://www.gnu.org/licenses/lgpl-3.0.txt
* - ASL 2.0: http://www.apache.org/licenses/LICENSE-2.0.txt
*/
package com.github.fge.jsonschema.keyword.digest.draftv4;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.github.fge.jackson.NodeType;
import com.github.fge.jsonschema.keyword.digest.AbstractDigester;
import com.github.fge.jsonschema.keyword.digest.Digester;
import com.google.common.collect.Lists;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
/**
* Digester for {@code required}
*
* <p>Its role is simply enough to ensure that, for instance, {@code
* ["a", "b"]} and {@code ["b", "a"]} produce the same output.</p>
*/
public final class RequiredDigester
extends AbstractDigester
{
private static final Digester INSTANCE = new RequiredDigester();
public static Digester getInstance()
{
return INSTANCE;
}
private RequiredDigester()
{
super("required", NodeType.OBJECT);
}
@Override
public JsonNode digest(final JsonNode schema)
{
final ObjectNode ret = FACTORY.objectNode();
final ArrayNode required = FACTORY.arrayNode();
ret.put(keyword, required);
final List<JsonNode> list = Lists.newArrayList(schema.get(keyword));
Collections.sort(list, new Comparator<JsonNode>()
{
@Override
public int compare(final JsonNode o1, final JsonNode o2)
{
return o1.textValue().compareTo(o2.textValue());
}
});
required.addAll(list);
return ret;
}
}