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// Copyright (C) 2018 The Android Open Source Project
//
// Licensed 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.google.gerrit.server.cache.serialize;
import static java.util.Objects.requireNonNull;
import com.google.protobuf.CodedInputStream;
import com.google.protobuf.CodedOutputStream;
import com.google.protobuf.TextFormat;
import java.io.IOException;
import java.util.Arrays;
public enum IntegerCacheSerializer implements CacheSerializer<Integer> {
INSTANCE;
// Same as com.google.protobuf.WireFormat#MAX_VARINT_SIZE. Note that negative values take up more
// than MAX_VARINT32_SIZE space.
private static final int MAX_VARINT_SIZE = 10;
@Override
public byte[] serialize(Integer object) {
byte[] buf = new byte[MAX_VARINT_SIZE];
CodedOutputStream cout = CodedOutputStream.newInstance(buf);
try {
cout.writeInt32NoTag(requireNonNull(object));
cout.flush();
} catch (IOException e) {
throw new IllegalStateException("Failed to serialize int", e);
}
int n = cout.getTotalBytesWritten();
return n == buf.length ? buf : Arrays.copyOfRange(buf, 0, n);
}
@Override
public Integer deserialize(byte[] in) {
CodedInputStream cin = CodedInputStream.newInstance(requireNonNull(in));
int ret;
try {
ret = cin.readRawVarint32();
} catch (IOException e) {
throw new IllegalArgumentException("Failed to deserialize int", e);
}
int n = cin.getTotalBytesRead();
if (n != in.length) {
throw new IllegalArgumentException(
"Extra bytes in int representation: "
+ TextFormat.escapeBytes(Arrays.copyOfRange(in, n, in.length)));
}
return ret;
}
}