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  package org.apache.cayenne.crypto.transformer.bytes;
  
  import java.util.Map;
  
  import org.apache.cayenne.crypto.CayenneCryptoException;
  import org.apache.cayenne.crypto.CryptoConstants;
  import org.apache.cayenne.crypto.cipher.CipherFactory;
  import org.apache.cayenne.crypto.key.KeySource;
  import org.apache.cayenne.di.Inject;
  
  /**
   * A {@link BytesTransformerFactory} that creates transformers depending on the
   * encryption mode specified via properties.
   * 
   * @since 4.0
   */
  public class DefaultBytesTransformerFactory implements BytesTransformerFactory {
  
      private BytesTransformerFactory delegate;
  
      static Header createEncryptionHeader(Map<String, String> properties, KeySource keySource) {
          boolean compressed = "true".equals(properties.get(CryptoConstants.COMPRESSION));
          boolean useHMAC = "true".equals(properties.get(CryptoConstants.USE_HMAC));
          return Header.create(keySource.getDefaultKeyAlias(), compressed, useHMAC);
      }
  
      public DefaultBytesTransformerFactory(@Inject(CryptoConstants.PROPERTIES_MAP) Map<String, String> properties,
              @Inject CipherFactory cipherFactory, @Inject KeySource keySource) {
  
          Header encryptionHeader = createEncryptionHeader(properties, keySource);
  
          String mode = properties.get(CryptoConstants.CIPHER_MODE);
          if (mode == null) {
              throw new CayenneCryptoException("Cipher mode is not set. Property name: " + CryptoConstants.CIPHER_MODE);
          }
  
          if ("CBC".equals(mode)) {
              this.delegate = new CbcBytesTransformerFactory(cipherFactory, keySource, encryptionHeader);
          }
          // TODO: ECB and other modes...
          else {
              throw new CayenneCryptoException("Unsupported mode: " + mode
                      + ". The following modes are currently supported:  CBC");
          }
      }
  
      @Override
      public BytesEncryptor encryptor() {
          return delegate.encryptor();
      }
  
      @Override
      public BytesDecryptor decryptor() {
          return delegate.decryptor();
      }
  }
  