hazelcast-master/hazelcast/src/main/java/com/hazelcast/internal/yaml/YamlToJsonConverter.java
/*
 * Copyright (c) 2008-2023, Hazelcast, Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.hazelcast.internal.yaml;

import org.json.JSONArray;
import org.json.JSONObject;

/**
 * Used to convert YAML configurations from their {@link YamlMapping} representation to their equivalent {@link JSONObject}
 * representation. It is necessary to convert the configuration written in YAML syntax against a JSON schema.
 */
public final class YamlToJsonConverter {

    private YamlToJsonConverter() {
        // util class
    }

    public static Object convert(YamlNode yamlNode) {
        if (yamlNode == null) {
            return JSONObject.NULL;
        }
        if (yamlNode instanceof YamlMapping) {
            YamlMapping yamlMapping = (YamlMapping) yamlNode;
            JSONObject resultObject = new JSONObject();
            for (YamlNameNodePair pair : yamlMapping.childrenPairs()) {
                resultObject.put(pair.nodeName(), convert(pair.childNode()));
            }
            return resultObject;
        } else if (yamlNode instanceof YamlSequence) {
            YamlSequence yamlSequence = (YamlSequence) yamlNode;
            JSONArray resultArray = new JSONArray();
            for (YamlNode child : yamlSequence.children()) {
                resultArray.put(convert(child));
            }
            return resultArray;
        } else if (yamlNode instanceof YamlScalar) {
            return ((YamlScalar) yamlNode).nodeValue();
        }
        throw new IllegalArgumentException("Unknown type " + yamlNode.getClass().getName());
    }
}
