https://github.com/datastax/native-protocol: A set of Java types representing the frames and messages of the Apache Cassandra® native protocol, with the associated serialization and deserialization logic (this is a third-party implementation, not related to the Apache Cassandra project)
  • Various (DataStax) 
public class com.datastax.oss.protocol.internal.request.Startup extends com.datastax.oss.protocol.internal.Message
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: com.datastax.oss.protocol.internal.request.Startup
  super_class: com.datastax.oss.protocol.internal.Message
{
  public static final java.lang.String CQL_VERSION_KEY;
    descriptor: Ljava/lang/String;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: "CQL_VERSION"

  public static final java.lang.String COMPRESSION_KEY;
    descriptor: Ljava/lang/String;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: "COMPRESSION"

  private static final java.lang.String CQL_VERSION;
    descriptor: Ljava/lang/String;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: "3.0.0"

  public final java.util.Map<java.lang.String, java.lang.String> options;
    descriptor: Ljava/util/Map;
    flags: (0x0011) ACC_PUBLIC, ACC_FINAL
    Signature: Ljava/util/Map<Ljava/lang/String;Ljava/lang/String;>;

  public void <init>(java.lang.String);
    descriptor: (Ljava/lang/String;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=2, args_size=2
        start local 0 // com.datastax.oss.protocol.internal.request.Startup this
        start local 1 // java.lang.String compressionAlgorithm
         0: .line 34
            aload 0 /* this */
         1: .line 35
            aload 1 /* compressionAlgorithm */
            ifnull 2
            aload 1 /* compressionAlgorithm */
            invokevirtual java.lang.String.isEmpty:()Z
            ifeq 3
         2: .line 36
      StackMap locals:
      StackMap stack: uninitialized-this
            ldc "CQL_VERSION"
            ldc "3.0.0"
            invokestatic com.datastax.oss.protocol.internal.util.collection.NullAllowingImmutableMap.of:(Ljava/lang/Object;Ljava/lang/Object;)Lcom/datastax/oss/protocol/internal/util/collection/NullAllowingImmutableMap;
            goto 5
         3: .line 38
      StackMap locals:
      StackMap stack: uninitialized-this
            ldc "CQL_VERSION"
            ldc "3.0.0"
            ldc "COMPRESSION"
            aload 1 /* compressionAlgorithm */
         4: .line 37
            invokestatic com.datastax.oss.protocol.internal.util.collection.NullAllowingImmutableMap.of:(Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;)Lcom/datastax/oss/protocol/internal/util/collection/NullAllowingImmutableMap;
      StackMap locals: uninitialized-this java.lang.String
      StackMap stack: uninitialized-this com.datastax.oss.protocol.internal.util.collection.NullAllowingImmutableMap
         5: invokespecial com.datastax.oss.protocol.internal.request.Startup.<init>:(Ljava/util/Map;)V
         6: .line 39
            return
        end local 1 // java.lang.String compressionAlgorithm
        end local 0 // com.datastax.oss.protocol.internal.request.Startup this
      LocalVariableTable:
        Start  End  Slot                  Name  Signature
            0    7     0                  this  Lcom/datastax/oss/protocol/internal/request/Startup;
            0    7     1  compressionAlgorithm  Ljava/lang/String;
    MethodParameters:
                      Name  Flags
      compressionAlgorithm  

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.datastax.oss.protocol.internal.request.Startup this
         0: .line 42
            aload 0 /* this */
            aconst_null
            invokespecial com.datastax.oss.protocol.internal.request.Startup.<init>:(Ljava/util/Map;)V
         1: .line 43
            return
        end local 0 // com.datastax.oss.protocol.internal.request.Startup this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/datastax/oss/protocol/internal/request/Startup;

  public void <init>(java.util.Map<java.lang.String, java.lang.String>);
    descriptor: (Ljava/util/Map;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=3, args_size=2
        start local 0 // com.datastax.oss.protocol.internal.request.Startup this
        start local 1 // java.util.Map options
         0: .line 46
            aload 0 /* this */
            iconst_0
            iconst_1
            invokespecial com.datastax.oss.protocol.internal.Message.<init>:(ZI)V
         1: .line 47
            aload 1 /* options */
            ifnull 9
         2: .line 48
            aload 1 /* options */
            ldc "CQL_VERSION"
            invokeinterface java.util.Map.containsKey:(Ljava/lang/Object;)Z
            ifeq 5
         3: .line 49
            aload 0 /* this */
            aload 1 /* options */
            invokestatic com.datastax.oss.protocol.internal.util.collection.NullAllowingImmutableMap.copyOf:(Ljava/util/Map;)Lcom/datastax/oss/protocol/internal/util/collection/NullAllowingImmutableMap;
            putfield com.datastax.oss.protocol.internal.request.Startup.options:Ljava/util/Map;
         4: .line 50
            goto 10
         5: .line 52
      StackMap locals: com.datastax.oss.protocol.internal.request.Startup java.util.Map
      StackMap stack:
            aload 1 /* options */
            invokeinterface java.util.Map.size:()I
            iconst_1
            iadd
            invokestatic com.datastax.oss.protocol.internal.util.collection.NullAllowingImmutableMap.builder:(I)Lcom/datastax/oss/protocol/internal/util/collection/NullAllowingImmutableMap$Builder;
         6: .line 51
            astore 2 /* builder */
        start local 2 // com.datastax.oss.protocol.internal.util.collection.NullAllowingImmutableMap$Builder builder
         7: .line 53
            aload 0 /* this */
            aload 2 /* builder */
            ldc "CQL_VERSION"
            ldc "3.0.0"
            invokevirtual com.datastax.oss.protocol.internal.util.collection.NullAllowingImmutableMap$Builder.put:(Ljava/lang/Object;Ljava/lang/Object;)Lcom/datastax/oss/protocol/internal/util/collection/NullAllowingImmutableMap$Builder;
            aload 1 /* options */
            invokevirtual com.datastax.oss.protocol.internal.util.collection.NullAllowingImmutableMap$Builder.putAll:(Ljava/util/Map;)Lcom/datastax/oss/protocol/internal/util/collection/NullAllowingImmutableMap$Builder;
            invokevirtual com.datastax.oss.protocol.internal.util.collection.NullAllowingImmutableMap$Builder.build:()Ljava/util/Map;
            putfield com.datastax.oss.protocol.internal.request.Startup.options:Ljava/util/Map;
        end local 2 // com.datastax.oss.protocol.internal.util.collection.NullAllowingImmutableMap$Builder builder
         8: .line 55
            goto 10
         9: .line 56
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            ldc "CQL_VERSION"
            ldc "3.0.0"
            invokestatic com.datastax.oss.protocol.internal.util.collection.NullAllowingImmutableMap.of:(Ljava/lang/Object;Ljava/lang/Object;)Lcom/datastax/oss/protocol/internal/util/collection/NullAllowingImmutableMap;
            putfield com.datastax.oss.protocol.internal.request.Startup.options:Ljava/util/Map;
        10: .line 58
      StackMap locals:
      StackMap stack:
            return
        end local 1 // java.util.Map options
        end local 0 // com.datastax.oss.protocol.internal.request.Startup this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0   11     0     this  Lcom/datastax/oss/protocol/internal/request/Startup;
            0   11     1  options  Ljava/util/Map<Ljava/lang/String;Ljava/lang/String;>;
            7    8     2  builder  Lcom/datastax/oss/protocol/internal/util/collection/NullAllowingImmutableMap$Builder<Ljava/lang/String;Ljava/lang/String;>;
    Signature: (Ljava/util/Map<Ljava/lang/String;Ljava/lang/String;>;)V
    MethodParameters:
         Name  Flags
      options  

  public java.lang.String toString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.datastax.oss.protocol.internal.request.Startup this
         0: .line 62
            new java.lang.StringBuilder
            dup
            ldc "STARTUP "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 0 /* this */
            getfield com.datastax.oss.protocol.internal.request.Startup.options:Ljava/util/Map;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/Object;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            areturn
        end local 0 // com.datastax.oss.protocol.internal.request.Startup this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/datastax/oss/protocol/internal/request/Startup;
}
SourceFile: "Startup.java"
NestMembers:
  com.datastax.oss.protocol.internal.request.Startup$Codec
InnerClasses:
  public Codec = com.datastax.oss.protocol.internal.request.Startup$Codec of com.datastax.oss.protocol.internal.request.Startup
  public Builder = com.datastax.oss.protocol.internal.util.collection.NullAllowingImmutableMap$Builder of com.datastax.oss.protocol.internal.util.collection.NullAllowingImmutableMap