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RESTHeart Commons - Common classes for core components and plugins.
There is a newer version: 8.1.7
/*-
 * ========================LICENSE_START=================================
 * restheart-commons
 * %%
 * Copyright (C) 2019 - 2024 SoftInstigate
 * %%
 * 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.
 * =========================LICENSE_END==================================
 */
package org.restheart.utils;

import java.util.Arrays;
import java.util.Objects;

import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonNull;
import com.google.gson.JsonObject;;

public class GsonUtils {
    /**
     * alias for ObjectBuilder.builder()
     *
     * @return the ObjectBuilder
     */
    public static ObjectBuilder object() {
        return ObjectBuilder.builder();
    }

    /**
     * alias for ObjectBuilder.builder()
     *
     * @return the ObjectBuilder
     */
    public static ObjectBuilder object(JsonObject obj) {
        return ObjectBuilder.builder(obj);
    }

    /**
     * alias for ArrayBuilder.builder()
     *
     * @return the ArrayBuilder
     */
    public static ArrayBuilder array() {
        return ArrayBuilder.builder();
    }

    /**
     * alias for ArrayBuilder.builder()
     *
     * @return the ArrayBuilder
     */
    public static ArrayBuilder array(JsonArray array) {
        return ArrayBuilder.builder(array);
    }

    /**
     * Builder to help creating JsonObject
     */
    public static class ObjectBuilder {
        private final JsonObject obj;

        public static ObjectBuilder builder() {
            return new ObjectBuilder();
        }

        public static ObjectBuilder builder(JsonObject obj) {
            return new ObjectBuilder(obj);
        }

        private ObjectBuilder() {
            this.obj = new JsonObject();
        }

        private ObjectBuilder(JsonObject obj) {
            this.obj = obj;
        }

        public ObjectBuilder put(String key, JsonElement value) {
            Objects.nonNull(key);
            Objects.nonNull(value);
            obj.add(key, value);
            return this;
        }

        public ObjectBuilder putAll(JsonObject other) {
            Objects.nonNull(other);
            other.entrySet().stream().forEach(e -> obj.add(e.getKey(), e.getValue()));
            return this;
        }

        public ObjectBuilder put(String key, Integer value) {
            Objects.nonNull(key);
            Objects.nonNull(value);
            obj.addProperty(key, value);
            return this;
        }

        public ObjectBuilder put(String key, Number value) {
            Objects.nonNull(key);
            Objects.nonNull(value);
            obj.addProperty(key, value);
            return this;
        }

        public ObjectBuilder put(String key, boolean value) {
            Objects.nonNull(key);
            Objects.nonNull(value);
            obj.addProperty(key, value);
            return this;
        }

        public ObjectBuilder put(String key, Character value) {
            Objects.nonNull(key);
            Objects.nonNull(value);
            obj.addProperty(key, value);
            return this;
        }

        public ObjectBuilder put(String key, String value) {
            Objects.nonNull(key);
            Objects.nonNull(value);
            obj.addProperty(key, value);
            return this;
        }

        public ObjectBuilder putNull(String key) {
            obj.add(key, JsonNull.INSTANCE);
            return this;
        }

        public ObjectBuilder put(String key, ArrayBuilder builder) {
            Objects.nonNull(key);
            Objects.nonNull(builder);
            obj.add(key, builder.get());
            return this;
        }

        public JsonObject get() {
            return obj;
        }
    }

    /**
     * Builder to help creating JsonArray
     */
    public static class ArrayBuilder {
        private final JsonArray array;

        public static ArrayBuilder builder() {
            return new ArrayBuilder();
        }

        public static ArrayBuilder builder(JsonArray array) {
            return new ArrayBuilder(array);
        }

        private ArrayBuilder() {
            this.array = new JsonArray();
        }

        private ArrayBuilder(JsonArray array) {
            this.array = array;
        }

        public ArrayBuilder add(JsonElement... values) {
            Objects.nonNull(values);
            Arrays.stream(values).forEach(array::add);
            return this;
        }

        public ArrayBuilder add(String... values) {
            Objects.nonNull(values);
            Arrays.stream(values).forEach(array::add);
            return this;
        }

        public ArrayBuilder add(Number... values) {
            Objects.nonNull(values);
            Arrays.stream(values).forEach(array::add);
            return this;
        }

        public ArrayBuilder add(Boolean... values) {
            Objects.nonNull(values);
            Arrays.stream(values).forEach(array::add);
            return this;
        }

        public ArrayBuilder addNull() {
            array.add(JsonNull.INSTANCE);
            return this;
        }

        public ArrayBuilder add(ObjectBuilder... builders) {
            Objects.nonNull(builders);
            Arrays.stream(builders).map(ObjectBuilder::get).forEach(array::add);
            return this;
        }

        public ArrayBuilder add(ArrayBuilder... builders) {
            Objects.nonNull(builders);
            Arrays.stream(builders).map(ArrayBuilder::get).forEach(array::add);
            return this;
        }

        public JsonArray get() {
            return array;
        }
    }
}