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// Copyright 2017 The Bazel Authors. All rights reserved.
//
// 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.devtools.build.lib.skyframe.serialization.strings;
import com.google.devtools.build.lib.skyframe.serialization.ObjectCodec;
import java.util.logging.Logger;
/** Utility for accessing (potentially platform-specific) {@link String} {@link ObjectCodec}s. */
public final class StringCodecs {
private static final Logger logger = Logger.getLogger(StringCodecs.class.getName());
private static final StringCodec stringCodec;
private static final ObjectCodec<String> asciiOptimized;
static {
stringCodec = new StringCodec();
if (FastStringCodec.isAvailable()) {
asciiOptimized = new FastStringCodec();
} else {
logger.warning("Optimized string deserialization unavailable");
asciiOptimized = stringCodec;
}
}
private StringCodecs() {}
/**
* Returns whether or not optimized codecs are available. Exposed so users can check at runtime
* if the expected optimizations are applied.
*/
public static boolean supportsOptimizedAscii() {
return asciiOptimized instanceof FastStringCodec;
}
/**
* Returns singleton instance optimized for almost-always ASCII data, if supported. Otherwise,
* returns a functional, but not optimized implementation. To tell if the optimized version is
* supported see {@link #supportsOptimizedAscii()}.
*
* <p>Note that when optimized, this instance can still serialize/deserialize UTF-8 data, but with
* potentially worse performance than {@link #simple()}.
*/
public static ObjectCodec<String> asciiOptimized() {
return asciiOptimized;
}
/**
* Returns singleton instance of basic implementation. Should be preferred over
* {@link #asciiOptimized()} when a sufficient amount of UTF-8 data is expected.
*/
public static ObjectCodec<String> simple() {
return stringCodec;
}
}
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