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    • cn.hutool.core.convert.impl.PrimitiveConverter Maven / Gradle / Ivy

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    Hutool是一个小而全的Java工具类库，通过静态方法封装，降低相关API的学习成本，提高工作效率，使Java拥有函数式语言般的优雅，让Java语言也可以“甜甜的”。

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    package cn.hutool.core.convert.impl;

import cn.hutool.core.convert.AbstractConverter;
import cn.hutool.core.convert.Convert;
import cn.hutool.core.convert.ConvertException;
import cn.hutool.core.util.ObjectUtil;
import cn.hutool.core.util.StrUtil;

import java.util.function.Function;

/**
 * 原始类型转换器
    
 * 支持类型为：
    
 * 
      
 * 		
    • {@code byte}
      • 
 * 		
    • {@code short}
      • 
 * 		 
    • {@code int}
      • 
 * 		 
    • {@code long}
      • 
 * 		
    • {@code float}
      • 
 * 		
    • {@code double}
      • 
 * 		
    • {@code char}
      • 
 * 		
    • {@code boolean}
      • 
 * 
    
 *
 * @author Looly
 */
public class PrimitiveConverter extends AbstractConverter {
	private static final long serialVersionUID = 1L;

	private final Class targetType;

	/**
	 * 构造
    
	 *
	 * @param clazz 需要转换的原始
	 * @throws IllegalArgumentException 传入的转换类型非原始类型时抛出
	 */
	public PrimitiveConverter(Class clazz) {
		if (null == clazz) {
			throw new NullPointerException("PrimitiveConverter not allow null target type!");
		} else if (false == clazz.isPrimitive()) {
			throw new IllegalArgumentException("[" + clazz + "] is not a primitive class!");
		}
		this.targetType = clazz;
	}

	@Override
	protected Object convertInternal(Object value) {
		return PrimitiveConverter.convert(value, this.targetType, this::convertToStr);
	}

	@Override
	protected String convertToStr(Object value) {
		return StrUtil.trim(super.convertToStr(value));
	}

	@Override
	@SuppressWarnings("unchecked")
	public Class getTargetType() {
		return (Class) this.targetType;
	}

	/**
	 * 将指定值转换为原始类型的值
	 * @param value 值
	 * @param primitiveClass 原始类型
	 * @param toStringFunc 当无法直接转换时，转为字符串后再转换的函数
	 * @return 转换结果
	 * @since 5.5.0
	 */
	protected static Object convert(Object value, Class primitiveClass, Function toStringFunc) {
		if (byte.class == primitiveClass) {
			return ObjectUtil.defaultIfNull(NumberConverter.convert(value, Byte.class, toStringFunc), 0);
		} else if (short.class == primitiveClass) {
			return ObjectUtil.defaultIfNull(NumberConverter.convert(value, Short.class, toStringFunc), 0);
		} else if (int.class == primitiveClass) {
			return ObjectUtil.defaultIfNull(NumberConverter.convert(value, Integer.class, toStringFunc), 0);
		} else if (long.class == primitiveClass) {
			return ObjectUtil.defaultIfNull(NumberConverter.convert(value, Long.class, toStringFunc), 0);
		} else if (float.class == primitiveClass) {
			return ObjectUtil.defaultIfNull(NumberConverter.convert(value, Float.class, toStringFunc), 0);
		} else if (double.class == primitiveClass) {
			return ObjectUtil.defaultIfNull(NumberConverter.convert(value, Double.class, toStringFunc), 0);
		} else if (char.class == primitiveClass) {
			return Convert.convert(Character.class, value);
		} else if (boolean.class == primitiveClass) {
			return Convert.convert(Boolean.class, value);
		}

		throw new ConvertException("Unsupported target type: {}", primitiveClass);
	}
}
    
    
    
    

    




    
    
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