com.devonfw.module.i18n.common.util.BundleMapSerializer.java Source code

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Here is the source code for com.devonfw.module.i18n.common.util.BundleMapSerializer.java

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/*******************************************************************************
 * Copyright 2015-2018 Capgemini SE.
 * 
 *  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.devonfw.module.i18n.common.util;

import java.io.IOException;
import java.lang.reflect.Type;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.devonfw.module.i18n.common.I18nConstants;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;

/**
 * TODO kugawand This type ...
 *
 * @author kugawand
 * @since dev
 */
public class BundleMapSerializer implements JsonSerializer<Map<String, String>> {

    private static final Logger LOG = LoggerFactory.getLogger(BundleMapSerializer.class);

    /**
     * {@inheritDoc}
     */
    @Override
    public JsonElement serialize(final Map<String, String> bundleMap, final Type typeOfSrc,
            final JsonSerializationContext context) {

        final JsonObject resultJson = new JsonObject();

        for (final String key : bundleMap.keySet()) {
            try {
                createFromBundleKey(resultJson, key, bundleMap.get(key));
            } catch (final IOException e) {
                LOG.error("Bundle Map Serialization Exception: ", e);
            }
        }

        return resultJson;
    }

    /**
     * @param resultJson JSON that will be returned for a filter
     * @param key from the resource Bundle
     * @param value from the resource Bundle
     * @return JsonObject JSON that will be returned for a key
     * @throws IOException thrown by createFromBundleKey
     */
    public static JsonObject createFromBundleKey(final JsonObject resultJson, final String key, final String value)
            throws IOException {

        if (!key.contains(I18nConstants.DOT)) {
            resultJson.addProperty(key, value);

            return resultJson;
        }

        final String currentKey = firstKey(key);

        if (currentKey != null) {
            final String subRightKey = key.substring(currentKey.length() + 1, key.length());
            final JsonObject childJson = getJsonIfExists(resultJson, currentKey);
            resultJson.add(currentKey, createFromBundleKey(childJson, subRightKey, value));
        }

        return resultJson;
    }

    private static String firstKey(final String fullKey) {

        final String[] splittedKey = fullKey.split("\\.");

        return (splittedKey.length != 0) ? splittedKey[0] : fullKey;
    }

    private static JsonObject getJsonIfExists(final JsonObject parent, final String key) {

        if (parent == null) {
            LOG.warn("Parent json parameter is null!");
            return null;
        }

        if (parent.get(key) != null && !(parent.get(key) instanceof JsonObject)) {
            throw new IllegalArgumentException("Invalid key \'" + key + "\' for parent: " + parent
                    + "\nKey can not be JSON object and property or array at a time");
        }

        if (parent.getAsJsonObject(key) != null) {
            return parent.getAsJsonObject(key);
        } else {
            return new JsonObject();
        }
    }

}