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Dson对象序列化模块
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/*
 * Copyright 2023-2024 wjybxx([email protected])
 *
 * 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 cn.wjybxx.dson.codec.codecs;

import cn.wjybxx.base.EnumLite;
import cn.wjybxx.dson.codec.DuplexCodec;
import cn.wjybxx.dson.codec.TypeArgInfo;
import cn.wjybxx.dson.codec.dson.DsonCodecScanIgnore;
import cn.wjybxx.dson.codec.dson.DsonObjectReader;
import cn.wjybxx.dson.codec.dson.DsonObjectWriter;
import cn.wjybxx.dson.codec.dsonlite.DsonLiteCodec;
import cn.wjybxx.dson.codec.dsonlite.DsonLiteCodecScanIgnore;
import cn.wjybxx.dson.codec.dsonlite.DsonLiteObjectReader;
import cn.wjybxx.dson.codec.dsonlite.DsonLiteObjectWriter;
import cn.wjybxx.dson.text.ObjectStyle;

import javax.annotation.Nonnull;
import java.util.Objects;
import java.util.function.IntFunction;

/**
 * 在之前的版本中，生成的代码直接继承{@link DsonLiteCodec}，这让枚举的编解码调整较为麻烦，
 * 因为要调整APT，而让枚举的Codec继承该Codec的话，生成的代码就更为稳定，我们调整编解码方式也更方便。
 *
 * @author wjybxx
 * date - 2023/4/24
 */
@DsonLiteCodecScanIgnore
@DsonCodecScanIgnore
public class EnumLiteCodec implements DuplexCodec {

    private final Class encoderClass;
    private final IntFunction mapper;

    /**
     * @param mapper forNumber静态方法的lambda表达式
     */
    public EnumLiteCodec(Class encoderClass, IntFunction mapper) {
        this.encoderClass = Objects.requireNonNull(encoderClass);
        this.mapper = Objects.requireNonNull(mapper);
    }

    public T forNumber(int number) {
        return mapper.apply(number);
    }

    @Nonnull
    @Override
    public Class getEncoderClass() {
        return encoderClass;
    }

    @Override
    public void writeObject(DsonLiteObjectWriter writer, T instance, TypeArgInfo typeArgInfo) {
        writer.writeInt(0, instance.getNumber());
    }

    @Override
    public T readObject(DsonLiteObjectReader reader, TypeArgInfo typeArgInfo) {
        return mapper.apply(reader.readInt(0));
    }

    @Override
    public T readObject(DsonObjectReader reader, TypeArgInfo typeArgInfo) {
        return mapper.apply(reader.readInt("number"));
    }

    @Override
    public void writeObject(DsonObjectWriter writer, T instance, TypeArgInfo typeArgInfo, ObjectStyle style) {
        writer.writeInt("number", instance.getNumber());
    }
}