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  package org.apache.cayenne.crypto.batch;
  
  import org.apache.cayenne.access.translator.DbAttributeBinding;
  import org.apache.cayenne.access.translator.batch.BatchTranslator;
  import org.apache.cayenne.access.translator.batch.BatchTranslatorFactory;
  import org.apache.cayenne.crypto.transformer.BindingsTransformer;
  import org.apache.cayenne.crypto.transformer.TransformerFactory;
  import org.apache.cayenne.dba.DbAdapter;
  import org.apache.cayenne.di.Inject;
  import org.apache.cayenne.query.BatchQuery;
  import org.apache.cayenne.query.BatchQueryRow;
  
  /**
   * @since 4.0
   */
  public class CryptoBatchTranslatorFactoryDecorator implements BatchTranslatorFactory {
  
      private TransformerFactory cryptoFactory;
      private BatchTranslatorFactory delegate;
  
      public CryptoBatchTranslatorFactoryDecorator(@Inject BatchTranslatorFactory delegate,
              @Inject TransformerFactory cryptoFactory) {
  
          this.cryptoFactory = cryptoFactory;
          this.delegate = delegate;
      }
  
      @Override
      public BatchTranslator translator(BatchQuery query, final DbAdapter adapter, String trimFunction) {
          final BatchTranslator delegateTranslator = delegate.translator(query, adapter, trimFunction);
  
          return new BatchTranslator() {
  
              private boolean encryptorCompiled;
              private BindingsTransformer encryptor;
  
              private void ensureEncryptorCompiled() {
                  if (!encryptorCompiled) {
                      encryptor = cryptoFactory.encryptor(getBindings(), adapter.getExtendedTypes());
                      encryptorCompiled = true;
                  }
              }
  
              @Override
              public String getSql() {
                  return delegateTranslator.getSql();
              }
  
              @Override
              public DbAttributeBinding[] getBindings() {
                  return delegateTranslator.getBindings();
              }
  
              @Override
              public DbAttributeBinding[] updateBindings(BatchQueryRow row) {
  
                  ensureEncryptorCompiled();
  
                  DbAttributeBinding[] bindings = delegateTranslator.updateBindings(row);
  
                  if (encryptor != null) {
                      encryptor.transform(bindings);
                  }
  
                  return bindings;
              }
          };
      }
  
  }
  