/*
    * Copyright (C) 2007-2012 Argeo GmbH
    *
    * 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.argeo.slc.core.deploy;
  
  import java.io.File;
  import java.io.IOException;
  
  import org.argeo.slc.SlcException;
  import org.springframework.core.io.Resource;
  import org.springframework.util.DigestUtils;
  
  /** Add Spring capabilities to {@link DigestUtils} */
  public class DigestCheck extends DigestUtils {
  	public static String digest(String algorithm, Resource resource) {
  		try {
  			File file = resource.getFile();
  			return org.argeo.util.DigestUtils.digest(algorithm, file);
  		} catch (IOException e) {
  			try {
  				return org.argeo.util.DigestUtils.digest(algorithm,
  						resource.getInputStream());
  			} catch (IOException e1) {
  				throw new SlcException("Cannot digest " + resource
  						+ " with algorithm " + algorithm, e);
  			}
  		}
  	}
  }