UserByNameLike.java

package com.cheng.zenofdesignpatterns.extension.newpatterns.specification.userquery;

/**
 * Like说明书
 */
public class UserByNameLike extends CompositeSpecification {

    // like的标记
    private final static String LIKE_FLAG = "%";
    // 基准的like字符串
    private String likeStr;

    // 构造函数传递基准姓名
    public UserByNameLike(String _likeStr) {
        this.likeStr = _likeStr;
    }

    // 检验用户是否满足条件
    public boolean isSatisfiedBy(User user) {
        boolean result = false;
        String name = user.getName();
        // 替换掉%后的干净字符串
        String str = likeStr.replace("%", "");
        // 是以名字开头，如'国庆%'
        if (likeStr.endsWith(LIKE_FLAG) && !likeStr.startsWith(LIKE_FLAG)) {
            result = name.startsWith(str);
        } else if (likeStr.startsWith(LIKE_FLAG) && !likeStr.endsWith(LIKE_FLAG)) { //类似 '%国庆'
            result = name.endsWith(str);
        } else {
            result = name.contains(str); // 类似于'%国庆%'
        }

        return result;
    }

}