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.oss.driver.internal.core.protocol;
  
  import static com.datastax.oss.driver.internal.core.util.Dependency.LZ4;
  
  import com.datastax.oss.driver.api.core.config.DefaultDriverOption;
  import com.datastax.oss.driver.api.core.context.DriverContext;
  import com.datastax.oss.driver.internal.core.util.GraalDependencyChecker;
  import com.datastax.oss.protocol.internal.Compressor;
  import com.oracle.svm.core.annotate.Substitute;
  import com.oracle.svm.core.annotate.TargetClass;
  import io.netty.buffer.ByteBuf;
  import java.util.Locale;
  import java.util.function.BooleanSupplier;
  
  /**
   * Handles GraalVM substitutions for compressors: LZ4 is only supported if we can find the native
   * library in the classpath, and Snappy is never supported.
   *
   * <p>When a compressor is not supported, we delete its class, and modify {@link
   * BuiltInCompressors#newInstance(String, DriverContext)} to throw an error if the user attempts to
   * configure it.
   */
  @SuppressWarnings("unused")
  public class CompressorSubstitutions {
  
    @TargetClass(value = BuiltInCompressors.class, onlyWith = Lz4Present.class)
    public static final class BuiltInCompressorsLz4Only {
      @Substitute
      public static Compressor<ByteBuf> newInstance(String name, DriverContext context) {
        switch (name.toLowerCase(Locale.ROOT)) {
          case "lz4":
            return new Lz4Compressor(context);
          case "snappy":
            throw new UnsupportedOperationException(
                "Snappy compression is not supported for native images");
          case "none":
            return Compressor.none();
          default:
            throw new IllegalArgumentException(
                String.format(
                    "Unsupported compression algorithm '%s' (from configuration option %s)",
                    name, DefaultDriverOption.PROTOCOL_COMPRESSION.getPath()));
        }
      }
    }
  
    @TargetClass(value = BuiltInCompressors.class, onlyWith = Lz4Missing.class)
    public static final class NoBuiltInCompressors {
      @Substitute
      public static Compressor<ByteBuf> newInstance(String name, DriverContext context) {
        switch (name.toLowerCase(Locale.ROOT)) {
          case "lz4":
            throw new UnsupportedOperationException(
                "This native image was not built with support for LZ4 compression");
          case "snappy":
            throw new UnsupportedOperationException(
                "Snappy compression is not supported for native images");
          case "none":
            return Compressor.none();
          default:
            throw new IllegalArgumentException(
                String.format(
                    "Unsupported compression algorithm '%s' (from configuration option %s)",
                    name, DefaultDriverOption.PROTOCOL_COMPRESSION.getPath()));
        }
      }
    }
  
    public static class Lz4Present implements BooleanSupplier {
      @Override
      public boolean getAsBoolean() {
        return GraalDependencyChecker.isPresent(LZ4);
      }
    }
  
    public static class Lz4Missing extends Lz4Present {
      @Override
      public boolean getAsBoolean() {
        return !super.getAsBoolean();
      }
    }
  }
  