/*
    * Copyright 2001-2010 The Apache Software Foundation.
    * 
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    * 
    *      http://www.apache.org/licenses/LICENSE-2.0
    * 
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   *
   */
  package org.apache.juddi.v3.client.config;
  
  import java.util.Properties;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  
  public class TokenResolver {
  	
  	private static Log log = LogFactory.getLog(TokenResolver.class);
  	
  	public synchronized static String replaceTokens(String string, Properties properties) {
      	
      	if (properties==null || string==null) return string;
      	string = string.replaceAll("\\n"," ").replaceAll("\\r", "").replaceAll(" ","");
  		/* pattern that is multi-line (?m), and looks for a pattern of
  		 * ${token}, in a 'reluctant' manner, by using the ? to 
  		 * make sure we find ALL the tokens.
  		 */
  		Pattern pattern = Pattern.compile("(?m)\\$\\{.*?\\}");
          Matcher matcher = pattern.matcher(string);
          while (matcher.find()) {
              String token = matcher.group();
              token = token.substring(2,token.length()-1);
              String replacement = properties.getProperty(token);
              if (replacement!=null) {
              	log.debug("Found token " + token + " and replacement value " + replacement);
              	string = string.replaceAll("\\$\\{" + token + "\\}", replacement);
              } else {
              	log.error("Found token " + token + " but could not obtain its value. Data: " + string);
              }
          }
          log.debug("Data after token replacement: " + string);
          return string;
  	}
  }