package org.dromara.common.translation.core.handler;
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import cn.hutool.core.util.ObjectUtil;
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import com.fasterxml.jackson.core.JsonGenerator;
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import com.fasterxml.jackson.databind.BeanProperty;
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import com.fasterxml.jackson.databind.JsonMappingException;
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import com.fasterxml.jackson.databind.JsonSerializer;
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import com.fasterxml.jackson.databind.SerializerProvider;
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import com.fasterxml.jackson.databind.ser.ContextualSerializer;
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import org.dromara.common.core.utils.StringUtils;
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import org.dromara.common.core.utils.reflect.ReflectUtils;
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import org.dromara.common.translation.annotation.Translation;
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import org.dromara.common.translation.core.TranslationInterface;
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import lombok.extern.slf4j.Slf4j;
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import java.io.IOException;
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import java.util.Map;
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import java.util.Objects;
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import java.util.concurrent.ConcurrentHashMap;
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/**
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* 翻译处理器
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*
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* @author Lion Li
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*/
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@Slf4j
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public class TranslationHandler extends JsonSerializer<Object> implements ContextualSerializer {
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/**
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* 全局翻译实现类映射器
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*/
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public static final Map<String, TranslationInterface<?>> TRANSLATION_MAPPER = new ConcurrentHashMap<>();
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private Translation translation;
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@Override
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public void serialize(Object value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
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TranslationInterface<?> trans = TRANSLATION_MAPPER.get(translation.type());
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if (ObjectUtil.isNotNull(trans)) {
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// 如果映射字段不为空 则取映射字段的值
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if (StringUtils.isNotBlank(translation.mapper())) {
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value = ReflectUtils.invokeGetter(gen.currentValue(), translation.mapper());
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}
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// 如果为 null 直接写出
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if (ObjectUtil.isNull(value)) {
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gen.writeNull();
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return;
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}
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try {
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Object result = trans.translation(value, translation.other());
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gen.writeObject(result);
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} catch (Exception e) {
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log.error("翻译处理异常，type: {}, value: {}", translation.type(), value, e);
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// 出现异常时输出原始值而不是中断序列化
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gen.writeObject(value);
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}
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} else {
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gen.writeObject(value);
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}
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}
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@Override
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public JsonSerializer<?> createContextual(SerializerProvider prov, BeanProperty property) throws JsonMappingException {
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Translation translation = property.getAnnotation(Translation.class);
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if (Objects.nonNull(translation)) {
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this.translation = translation;
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return this;
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}
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return prov.findValueSerializer(property.getType(), property);
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}
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}
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