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A Java implementation of the JSON Schema specification.

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package xpertss.json.schema.keyword.digest.common;

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 xpertss.json.schema.keyword.digest.AbstractDigester;
import xpertss.json.schema.keyword.digest.Digester;
import com.google.common.collect.Lists;

import java.util.Collections;
import java.util.List;

/**
 * Digester for {@code additionalProperties}
 *
 * The digested form will contain the list of members from {@code properties}
 * and {@code patternProperties}, unless this keyword is {@code true} or a
 * schema, in which case additional properties are always allowed.
 */
public final class AdditionalPropertiesDigester extends AbstractDigester {

    private static final Digester INSTANCE = new AdditionalPropertiesDigester();

    public static Digester getInstance()
    {
        return INSTANCE;
    }

    private AdditionalPropertiesDigester()
    {
        super("additionalProperties", NodeType.OBJECT);
    }

    @Override
    public JsonNode digest(JsonNode schema)
    {
        ObjectNode ret = FACTORY.objectNode();
        ArrayNode properties = FACTORY.arrayNode();
        ArrayNode patternProperties = FACTORY.arrayNode();

        /*
         * Start by presuming that additional properties are allowed. This will
         * not be the case if and only if it has boolean value false.
         */
        ret.put(keyword, true);
        ret.put("properties", properties);
        ret.put("patternProperties", patternProperties);

        if (schema.get(keyword).asBoolean(true))
            return ret;

        /*
         * OK, it is false... Therefore collect the list of defined property
         * names and regexes. Put them in order, we don't want to generate two
         * different digests for properties p, q and q, p.
         */
        ret.put(keyword, false);

        List list = Lists.newArrayList(schema.path("properties").fieldNames());

        Collections.sort(list);
        for (final String s: list)
            properties.add(s);

        list = Lists.newArrayList(schema.path("patternProperties").fieldNames());
        Collections.sort(list);
        for (final String s: list)
            patternProperties.add(s);

        return ret;
    }
}