package cn.lihu.jh.framework.desensitize.core.slider.handler;
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import cn.lihu.jh.framework.desensitize.core.base.handler.DesensitizationHandler;
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import java.lang.annotation.Annotation;
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/**
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* 滑动脱敏处理器抽象类，已实现通用的方法
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*
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* @author gaibu
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*/
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public abstract class AbstractSliderDesensitizationHandler<T extends Annotation>
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implements DesensitizationHandler<T> {
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@Override
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public String desensitize(String origin, T annotation) {
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int prefixKeep = getPrefixKeep(annotation);
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int suffixKeep = getSuffixKeep(annotation);
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String replacer = getReplacer(annotation);
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int length = origin.length();
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// 情况一：原始字符串长度小于等于保留长度，则原始字符串全部替换
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if (prefixKeep >= length || suffixKeep >= length) {
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return buildReplacerByLength(replacer, length);
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}
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// 情况二：原始字符串长度小于等于前后缀保留字符串长度，则原始字符串全部替换
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if ((prefixKeep + suffixKeep) >= length) {
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return buildReplacerByLength(replacer, length);
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}
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// 情况三：原始字符串长度大于前后缀保留字符串长度，则替换中间字符串
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int interval = length - prefixKeep - suffixKeep;
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return origin.substring(0, prefixKeep) +
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buildReplacerByLength(replacer, interval) +
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origin.substring(prefixKeep + interval);
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}
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/**
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* 根据长度循环构建替换符
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*
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* @param replacer 替换符
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* @param length 长度
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* @return 构建后的替换符
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*/
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private String buildReplacerByLength(String replacer, int length) {
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StringBuilder builder = new StringBuilder();
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for (int i = 0; i < length; i++) {
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builder.append(replacer);
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}
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return builder.toString();
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}
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/**
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* 前缀保留长度
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*
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* @param annotation 注解信息
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* @return 前缀保留长度
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*/
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abstract Integer getPrefixKeep(T annotation);
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/**
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* 后缀保留长度
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*
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* @param annotation 注解信息
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* @return 后缀保留长度
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*/
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abstract Integer getSuffixKeep(T annotation);
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/**
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* 替换符
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*
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* @param annotation 注解信息
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* @return 替换符
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*/
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abstract String getReplacer(T annotation);
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}
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