com.xiushang.config.ApiVersionCondition Maven / Gradle / Ivy

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package com.xiushang.config;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.servlet.mvc.condition.RequestCondition;

import javax.servlet.http.HttpServletRequest;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class ApiVersionCondition implements RequestCondition {
	private static Logger log = LoggerFactory.getLogger(ApiVersionCondition.class);

	// 路径中版本的前缀， 这里用 /v[1-9]/的形式
    private final static Pattern VERSION_PREFIX_PATTERN = Pattern.compile("v(\\d+)/");

    private int apiVersion;

    //构造
    public ApiVersionCondition(int apiVersion){
        this.apiVersion = apiVersion;
    }

    public int getApiVersion() {
        return apiVersion;
    }

    @Override
    public ApiVersionCondition combine(ApiVersionCondition other) {
        // 采用最后定义优先原则，则方法上的定义覆盖类上面的定义
        return new ApiVersionCondition(other.getApiVersion());
    }

    @Override
    public ApiVersionCondition getMatchingCondition(HttpServletRequest request) {
    	log.info("---- getMatchingCondition ----");
        Matcher m = VERSION_PREFIX_PATTERN.matcher(request.getRequestURI());
        if(m.find()){
            Integer version = Integer.valueOf(m.group(1));
            log.info("---- getMatchingCondition ----version="+String.valueOf(version));
            if(version >= this.apiVersion){
                return this;
            }
        }
        return null;
    }

    @Override
    public int compareTo(ApiVersionCondition other, HttpServletRequest request) {
        // 优先匹配最新的版本号
        return other.getApiVersion() - this.apiVersion;
    }
}