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/**
 *
 * Copyright (C) 2010 Cloud Conscious, LLC. 
 *
 * ====================================================================
 * 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.jclouds.aws.sqs.xml;

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

import javax.inject.Inject;

import org.jclouds.crypto.CryptoStreams;
import org.jclouds.http.HttpResponse;
import org.jclouds.http.functions.ReturnStringIf2xx;

import com.google.common.base.Function;
import com.google.inject.Singleton;

/**
 * 
 * @see 
 * @author Adrian Cole
 */
@Singleton
public class RegexMD5Handler implements Function {
   Pattern pattern = Pattern.compile("([\\S&&[^<]]+)");
   private final ReturnStringIf2xx returnStringIf200;

   @Inject
   RegexMD5Handler(ReturnStringIf2xx returnStringIf200) {
      this.returnStringIf200 = returnStringIf200;
   }

   @Override
   public byte[] apply(HttpResponse response) {
      byte[] value = null;
      String content = returnStringIf200.apply(response);
      if (content != null) {
         Matcher matcher = pattern.matcher(content);
         if (matcher.find()) {
            value = CryptoStreams.hex(matcher.group(1));
         }
      }
      return value;
   }

}