content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 com.datastax.driver.core;
  
  import java.io.UnsupportedEncodingException;
  import java.security.MessageDigest;
  import java.security.NoSuchAlgorithmException;
  
  // Unfortunately, MD5Digest and fields in PreparedStatement are package-private, so the easiest way to test these
  // things while still using the driver was to create a class in DS package.
  public class PreparedStatementHelper
  {
      private static final MessageDigest cachedDigest;
  
      static {
          try {
              cachedDigest = MessageDigest.getInstance("MD5");
          } catch (NoSuchAlgorithmException e) {
              throw new IllegalStateException(e);
          }
      }
  
      private static MD5Digest id(PreparedStatement statement)
      {
          return statement.getPreparedId().boundValuesMetadata.id;
      }
  
      public static void assertHashWithoutKeyspace(PreparedStatement statement, String queryString, String ks)
      {
          MD5Digest returned = id(statement);
          if (!returned.equals(hashWithoutKeyspace(queryString, ks)))
          {
              if (returned.equals(hashWithKeyspace(queryString, ks)))
                  throw new AssertionError(String.format("Got hash with keyspace from the cluster: %s, should have gotten %s",
                                                         returned, hashWithoutKeyspace(queryString, ks)));
              else
                  throw new AssertionError(String.format("Got unrecognized hash: %s",
                                                         returned));
          }
      }
  
      public static void assertHashWithKeyspace(PreparedStatement statement, String queryString, String ks)
      {
          MD5Digest returned = id(statement);
          if (!returned.equals(hashWithKeyspace(queryString, ks)))
          {
              if (returned.equals(hashWithoutKeyspace(queryString, ks)))
                  throw new AssertionError(String.format("Got hash without keyspace from the cluster: %s, should have gotten %s",
                                                         returned, hashWithKeyspace(queryString, ks)));
              else
                  throw new AssertionError(String.format("Got unrecognized hash: %s",
                                                         returned));
          }
  
      }
  
      public static boolean equalsToHashWithKeyspace(byte[] digest, String queryString, String ks)
      {
          return MD5Digest.wrap(digest).equals(hashWithKeyspace(queryString, ks));
      }
  
      public static MD5Digest hashWithKeyspace(String queryString, String ks)
      {
          return computeId(queryString, ks);
      }
  
      public static boolean equalsToHashWithoutKeyspace(byte[] digest, String queryString, String ks)
      {
          return MD5Digest.wrap(digest).equals(hashWithoutKeyspace(queryString, ks));
      }
  
      public static MD5Digest hashWithoutKeyspace(String queryString, String ks)
      {
          return computeId(queryString, null);
      }
  
      private static MD5Digest computeId(String queryString, String keyspace) {
          return compute(keyspace == null ? queryString : keyspace + queryString);
      }
  
      public static MD5Digest compute(String toHash) {
          try {
              return compute(toHash.getBytes("UTF-8"));
          } catch (UnsupportedEncodingException e) {
              throw new RuntimeException(e.getMessage());
          }
      }
  
      public static synchronized MD5Digest compute(byte[] toHash) {
          cachedDigest.reset();
          return MD5Digest.wrap(cachedDigest.digest(toHash));
      }
  }
  