SystemParametersHelper.java

//* Licensed Materials - Property of                                  *
//* IBM                                                               *
//* Miracle A/S                                                       *
//* Alexandra Instituttet A/S                                         *
//*                                                                   *
//* eu.abc4trust.pabce.1.34                                           *
//*                                                                   *
//* (C) Copyright IBM Corp. 2014. All Rights Reserved.                *
//* (C) Copyright Miracle A/S, Denmark. 2014. All Rights Reserved.    *
//* (C) Copyright Alexandra Instituttet A/S, Denmark. 2014. All       *
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//* disclosure restricted by GSA ADP Schedule Contract with IBM Corp. *
//*                                                                   *
//* This file is 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         *
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//* under the License.                                                *
//*/**/****************************************************************

package eu.abc4trust.ri.servicehelper;

import java.util.logging.Logger;

import eu.abc4trust.cryptoEngine.util.SystemParametersUtil;
import eu.abc4trust.keyManager.KeyManager;
import eu.abc4trust.keyManager.KeyManagerException;
import eu.abc4trust.xml.SystemParameters;

public class SystemParametersHelper {
  private static final Logger logger = Logger.getLogger(SystemParametersHelper.class.toString());

  public static SystemParameters checkAndLoadSystemParametersIfAbsent(KeyManager keyManager,
      String systemParametersStoragePath) throws KeyManagerException {
    SystemParameters systemParameters = checkIfSystemParametersAreLoaded(keyManager);

    if (systemParameters != null) {
      return systemParameters;
    }

    systemParameters = loadSystemParameters(keyManager);

    if (systemParameters != null) {
      return systemParameters;
    }

    return null;
  }

  /**
   * Check if system parameters are available in the 'file system' Return true if the system
   * parameters are loaded from disk. And false otherwise.
   * 
   * @param keyManager
   * @return
   * @throws KeyManagerException
   */
  private static SystemParameters loadSystemParameters(KeyManager keyManager)
      throws KeyManagerException {
    SystemParameters systemParameters = SystemParametersUtil.getDefaultSystemParameters_2048();
    keyManager.storeSystemParameters(systemParameters);
    return systemParameters;
  }

  private static SystemParameters checkIfSystemParametersAreLoaded(KeyManager keyManager)
      throws KeyManagerException {
    SystemParameters systemParameters = null;
    if (keyManager.hasSystemParameters()) {
      logger.info("- system parameters already in keyManager");
      systemParameters = keyManager.getSystemParameters();
      return systemParameters;
    }
    return null;
  }
}