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 package cn.tom.mvc.ext;

import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

 /**
  * Ant-style的路径匹配工具类
  *
  */
public class AntPathStringMatcher {

     private static final Pattern GLOB_PATTERN = Pattern.compile("\\?|\\*|\\{([^/]+?)\\}");

     private static final String DEFAULT_VARIABLE_PATTERN = "(.*)";

     private final Pattern pattern;

     private String str;

     private final List variableNames = new LinkedList();

     private final Map uriTemplateVariables;

     /** Construct a new instance of the AntPatchStringMatcher. */
     AntPathStringMatcher(String pattern, String str, Map uriTemplateVariables) {
         this.str = str;
         this.uriTemplateVariables = uriTemplateVariables;
         this.pattern = createPattern(pattern);
     }

     private Pattern createPattern(String pattern) {
         StringBuilder patternBuilder = new StringBuilder();
         Matcher m = GLOB_PATTERN.matcher(pattern);
         int end = 0;
         while (m.find()) {
             patternBuilder.append(quote(pattern, end, m.start()));
             String match = m.group();
             if ("?".equals(match)) {
                 patternBuilder.append('.');
             }
             else if ("*".equals(match)) {
                 patternBuilder.append(".*");
             }
             else if (match.startsWith("{") && match.endsWith("}")) {
                 int colonIdx = match.indexOf(':');
                 if (colonIdx == -1) {
                     patternBuilder.append(DEFAULT_VARIABLE_PATTERN);
                     variableNames.add(m.group(1));
                 }
                 else {
                     String variablePattern = match.substring(colonIdx + 1, match.length() - 1);
                     patternBuilder.append('(');
                     patternBuilder.append(variablePattern);
                     patternBuilder.append(')');
                     String variableName = match.substring(1, colonIdx);
                     variableNames.add(variableName);
                 }
             }
             end = m.end();
         }
         patternBuilder.append(quote(pattern, end, pattern.length()));
         return Pattern.compile(patternBuilder.toString());
     }

     private String quote(String s, int start, int end) {
         if (start == end) {
             return "";
         }
         return Pattern.quote(s.substring(start, end));
     }

     /**
      * Main entry point.
      *
      * @return true if the string matches against the pattern, or false otherwise.
      */
     public boolean matchStrings() {
         Matcher matcher = pattern.matcher(str);
         if (matcher.matches()) {
             if (uriTemplateVariables != null) {
                 for (int i = 1; i <= matcher.groupCount(); i++) {
                     String name = this.variableNames.get(i - 1);
                     String value = matcher.group(i);
                     uriTemplateVariables.put(name, value);
                 }
             }
             return true;
         }
         else {
             return false;
         }
     }

 }