org.dromara.hutool.json.writer.GlobalValueWriters Maven / Gradle / Ivy

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Hutool是一个优雅而小巧的Java工具类库

There is a newer version: 6.0.0.M3

/*
 * Copyright (c) 2013-2024 Hutool Team and hutool.cn
 *
 * 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 org.dromara.hutool.json.writer;

import org.dromara.hutool.core.lang.Assert;

import java.util.*;

/**
 * 全局自定义对象写出

 * 用户通过此全局定义，可针对某些特殊对象
 *
 * @author looly
 * @since 6.0.0
 */
public class GlobalValueWriters {

	private static final List valueWriterList;

	static {
		valueWriterList = Collections.synchronizedList(new LinkedList<>());
		valueWriterList.add(NumberValueWriter.INSTANCE);
		valueWriterList.add(DateValueWriter.INSTANCE);
		valueWriterList.add(BooleanValueWriter.INSTANCE);
		valueWriterList.add(JSONStringValueWriter.INSTANCE);
		valueWriterList.add(ClassValueWriter.INSTANCE);
		valueWriterList.add(JdkValueWriter.INSTANCE);
	}

	/**
	 * 加入自定义的对象值写出规则，自定义规则总是优先
	 *
	 * @param valueWriter 自定义对象写出实现
	 */
	public static void add(final JSONValueWriter valueWriter) {
		valueWriterList.add(0, Assert.notNull(valueWriter));
	}

	/**
	 * 获取自定义对象值写出规则
	 *
	 * @param value 值，{@code null}表示需要自定义null的输出
	 * @return 自定义的 {@link JSONValueWriter}
	 */
	public static JSONValueWriter get(final Object value) {
		if (value instanceof JSONValueWriter) {
			return (JSONValueWriter) value;
		}

		return valueWriterList.stream().filter(writer -> writer.test(value)).findFirst().orElse(null);
	}
}