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Java High Performance Web Development Framework

There is a newer version: 1.8.6

package com.litongjava.tio.boot.satoken;

import java.util.LinkedHashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class PathAnalyzer {

  private static final Map cached = new LinkedHashMap<>();
  private final Pattern pattern;

  public static PathAnalyzer get(String expr) {
    PathAnalyzer pa = cached.get(expr);
    if (pa == null) {
      synchronized (expr.intern()) {
        pa = cached.get(expr);
        if (pa == null) {
          pa = new PathAnalyzer(expr);
          cached.put(expr, pa);
        }
      }
    }

    return pa;
  }

  private PathAnalyzer(String expr) {
    this.pattern = Pattern.compile(exprCompile(expr), Pattern.CASE_INSENSITIVE);
  }

  public Matcher matcher(String uri) {
    return this.pattern.matcher(uri);
  }

  public boolean matches(String uri) {
    return this.pattern.matcher(uri).find();
  }

  private static String exprCompile(String expr) {
    String p = expr.replace(".", "\\.");
    p = p.replace("$", "\\$");
    p = p.replace("**", ".[]");
    p = p.replace("*", "[^/]*");
    if (p.contains("{")) {
      if (p.indexOf("_}") > 0) {
        p = p.replaceAll("\\{[^\\}]+?\\_\\}", "(.+?)");
      }

      p = p.replaceAll("\\{[^\\}]+?\\}", "([^/]+?)");
    }

    if (!p.startsWith("/")) {
      p = "/" + p;
    }

    p = p.replace(".[]", ".*");
    return "^" + p + "$";
  }
}