Line data    Source code

       1             : // Copyright (C) 2018 The Android Open Source Project
       2             : //
       3             : // Licensed under the Apache License, Version 2.0 (the "License");
       4             : // you may not use this file except in compliance with the License.
       5             : // You may obtain a copy of the License at
       6             : //
       7             : // http://www.apache.org/licenses/LICENSE-2.0
       8             : //
       9             : // Unless required by applicable law or agreed to in writing, software
      10             : // distributed under the License is distributed on an "AS IS" BASIS,
      11             : // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      12             : // See the License for the specific language governing permissions and
      13             : // limitations under the License.
      14             : 
      15             : package com.google.gerrit.server.cache.serialize;
      16             : 
      17             : import static java.nio.charset.StandardCharsets.UTF_8;
      18             : 
      19             : import com.google.common.annotations.VisibleForTesting;
      20             : import java.nio.ByteBuffer;
      21             : import java.nio.CharBuffer;
      22             : import java.nio.charset.CharacterCodingException;
      23             : import java.nio.charset.Charset;
      24             : import java.nio.charset.CodingErrorAction;
      25             : 
      26         154 : public enum StringCacheSerializer implements CacheSerializer<String> {
      27         154 :   INSTANCE;
      28             : 
      29             :   @Override
      30             :   public byte[] serialize(String object) {
      31           2 :     return serialize(UTF_8, object);
      32             :   }
      33             : 
      34             :   @VisibleForTesting
      35             :   static byte[] serialize(Charset charset, String s) {
      36           2 :     if (s.isEmpty()) {
      37           1 :       return new byte[0];
      38             :     }
      39             :     try {
      40           2 :       ByteBuffer buf =
      41             :           charset
      42           2 :               .newEncoder()
      43           2 :               .onMalformedInput(CodingErrorAction.REPORT)
      44           2 :               .onUnmappableCharacter(CodingErrorAction.REPORT)
      45           2 :               .encode(CharBuffer.wrap(s));
      46           2 :       byte[] result = new byte[buf.remaining()];
      47           2 :       buf.get(result);
      48           2 :       return result;
      49           1 :     } catch (CharacterCodingException e) {
      50           1 :       throw new IllegalStateException("Failed to serialize string", e);
      51             :     }
      52             :   }
      53             : 
      54             :   @Override
      55             :   public String deserialize(byte[] in) {
      56           2 :     if (in.length == 0) {
      57           1 :       return "";
      58             :     }
      59             :     try {
      60           2 :       return UTF_8
      61           2 :           .newDecoder()
      62           2 :           .onMalformedInput(CodingErrorAction.REPORT)
      63           2 :           .onUnmappableCharacter(CodingErrorAction.REPORT)
      64           2 :           .decode(ByteBuffer.wrap(in))
      65           2 :           .toString();
      66           1 :     } catch (CharacterCodingException e) {
      67           1 :       throw new IllegalStateException("Failed to deserialize string", e);
      68             :     }
      69             :   }
      70             : }