cn.k7g.alloy.ioc.conversion.AlloyConversionService Maven / Gradle / Ivy

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package cn.k7g.alloy.ioc.conversion;

import cn.k7g.alloy.annotation.AlloyContent;
import cn.k7g.alloy.model.AlloyContentHold;
import org.springframework.boot.autoconfigure.web.format.DateTimeFormatters;
import org.springframework.boot.autoconfigure.web.format.WebConversionService;
import org.springframework.core.ResolvableType;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.core.convert.converter.GenericConverter;
import org.springframework.lang.Nullable;

/**
 * 处理参数中的 alloy content 解码部分
 *
 * 接管 mvcConversionService， 如果重写了 ConfigurableWebBindingInitializer
 * 可能会导致 AlloyConversionService 不生效，注意配置。 参考如下代码位置
 * @see org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration.EnableWebMvcConfiguration#getConfigurableWebBindingInitializer(org.springframework.format.support.FormattingConversionService, org.springframework.validation.Validator)
 *
 *
 * 在 ConfigurableWebBindingInitializer.setConversionService 中，建议将 ConversionService 交给 AlloyConversionService 处理
 *
 * AlloyConversionService 的初始化代码 参考
 * @see cn.k7g.alloy.ioc.processor.EnhanceAlloyConversionServiceProcess
 *
 *
 * @author victor-wu
 * @date 2021/9/27 下午1:10
 */
public class AlloyConversionService extends WebConversionService {
    /**
     * Create a new WebConversionService that configures formatters with the provided
     * date, time, and date-time formats, or registers the default if no custom format is
     * provided.
     *
     * @param dateTimeFormatters the formatters to use for date, time, and date-time
     *                           formatting
     * @since 2.3.0
     */
    public AlloyConversionService(DateTimeFormatters dateTimeFormatters) {
        super(dateTimeFormatters);
    }


    @Nullable
    public GenericConverter getConverter(TypeDescriptor sourceType, TypeDescriptor targetType) {
        if (targetType.hasAnnotation(AlloyContent.class)) {
            // 创建临时 TypeDescriptor 用于匹配到 AlloyContentConverter
            targetType = new TypeDescriptor(ResolvableType.forClass(AlloyContentHold.class), AlloyContentHold.class, targetType.getAnnotations());
        }
        return super.getConverter(sourceType, targetType);
    }
}