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 org.apache.cassandra.serializers;
  
  import java.nio.ByteBuffer;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import javax.annotation.Nonnull;
  import javax.annotation.Nullable;
  
  import org.apache.cassandra.db.marshal.ByteBufferAccessor;
  import org.apache.cassandra.db.marshal.ValueAccessor;
  
  public abstract class TypeSerializer<T>
  {
      private static final Pattern PATTERN_SINGLE_QUOTE = Pattern.compile("'", Pattern.LITERAL);
      private static final String ESCAPED_SINGLE_QUOTE = Matcher.quoteReplacement("\'");
  
      public abstract ByteBuffer serialize(T value);
  
      public abstract <V> T deserialize(V value, ValueAccessor<V> accessor);
  
      /*
       * Does not modify the position or limit of the buffer even temporarily.
       */
      public final T deserialize(ByteBuffer bytes)
      {
          return deserialize(bytes, ByteBufferAccessor.instance);
      }
  
      /*
       * Validate that the byte array is a valid sequence for the type this represents.
       * This guarantees deserialize() can be called without errors.
       */
      public abstract <V> void validate(V value, ValueAccessor<V> accessor) throws MarshalException;
  
      /*
       * Does not modify the position or limit of the buffer even temporarily.
       */
      public final void validate(ByteBuffer bytes) throws MarshalException
      {
          validate(bytes, ByteBufferAccessor.instance);
      }
  
      public abstract String toString(T value);
  
      public abstract Class<T> getType();
  
      public final boolean isNull(@Nullable ByteBuffer buffer)
      {
          return isNull(buffer, ByteBufferAccessor.instance);
      }
  
      public <V> boolean isNull(@Nullable V buffer, ValueAccessor<V> accessor)
      {
          return buffer == null || accessor.isEmpty(buffer);
      }
  
      protected String toCQLLiteralNonNull(@Nonnull ByteBuffer buffer)
      {
          return toString(deserialize(buffer));
      }
  
      public final @Nonnull String toCQLLiteral(@Nullable ByteBuffer buffer)
      {
          return isNull(buffer)
                 ? "null"
                 :  maybeQuote(toCQLLiteralNonNull(buffer));
      }
  
      public final @Nonnull String toCQLLiteralNoQuote(@Nullable ByteBuffer buffer)
      {
          return isNull(buffer)
                 ? "null"
                 :  toCQLLiteralNonNull(buffer);
      }
  
      public boolean shouldQuoteCQLLiterals()
      {
          return false;
      }
  
      private String maybeQuote(String value)
      {
          if (shouldQuoteCQLLiterals())
              return "'" + PATTERN_SINGLE_QUOTE.matcher(value).replaceAll(ESCAPED_SINGLE_QUOTE) + "'";
          return value;
      }
  }
  
  