https://github.com/eclipse/eclipse-collections/eclipse-collections: Eclipse Collections is a collections framework for Java. It has JDK-compatible List, Set and Map implementations with a rich API and set of utility classes that work with any JDK compatible Collections, Arrays, Maps or Strings. The iteration protocol was inspired by the Smalltalk collection framework.
  • Craig P. Motlin
  • Donald Raab
  • Mohammad A. Rezaei
  • Hiroshi Ito
  • Nikhil J. Nanivadekar 
final class org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$SentinelValues<V>
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$SentinelValues
  super_class: java.lang.Object
{
  private boolean containsZeroKey;
    descriptor: Z
    flags: (0x0002) ACC_PRIVATE

  private boolean containsOneKey;
    descriptor: Z
    flags: (0x0002) ACC_PRIVATE

  private V zeroValue;
    descriptor: Ljava/lang/Object;
    flags: (0x0002) ACC_PRIVATE
    Signature: TV;

  private V oneValue;
    descriptor: Ljava/lang/Object;
    flags: (0x0002) ACC_PRIVATE
    Signature: TV;

  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$SentinelValues this
         0: .line 2897
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$SentinelValues this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/map/mutable/primitive/DoubleObjectHashMap$SentinelValues<TV;>;

  public int size();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$SentinelValues this
         0: .line 2906
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$SentinelValues.containsZeroKey:Z
            ifeq 1
            iconst_1
            goto 2
      StackMap locals:
      StackMap stack:
         1: iconst_0
      StackMap locals:
      StackMap stack: int
         2: aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$SentinelValues.containsOneKey:Z
            ifeq 3
            iconst_1
            goto 4
      StackMap locals:
      StackMap stack: int
         3: iconst_0
      StackMap locals: org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$SentinelValues
      StackMap stack: int int
         4: iadd
            ireturn
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$SentinelValues this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    5     0  this  Lorg/eclipse/collections/impl/map/mutable/primitive/DoubleObjectHashMap$SentinelValues<TV;>;

  public boolean containsValue();
    descriptor: (Ljava/lang/Object;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=4, args_size=2
        start local 0 // org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$SentinelValues this
        start local 1 // java.lang.Object value
         0: .line 2911
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$SentinelValues.containsZeroKey:Z
            ifeq 1
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$SentinelValues.zeroValue:Ljava/lang/Object;
            aload 1 /* value */
            invokestatic org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap.nullSafeEquals:(Ljava/lang/Object;Ljava/lang/Object;)Z
            ifeq 1
            iconst_1
            goto 2
      StackMap locals:
      StackMap stack:
         1: iconst_0
      StackMap locals:
      StackMap stack: int
         2: istore 2 /* valueEqualsZeroValue */
        start local 2 // boolean valueEqualsZeroValue
         3: .line 2912
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$SentinelValues.containsOneKey:Z
            ifeq 4
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$SentinelValues.oneValue:Ljava/lang/Object;
            aload 1 /* value */
            invokestatic org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap.nullSafeEquals:(Ljava/lang/Object;Ljava/lang/Object;)Z
            ifeq 4
            iconst_1
            goto 5
      StackMap locals: int
      StackMap stack:
         4: iconst_0
      StackMap locals:
      StackMap stack: int
         5: istore 3 /* valueEqualsOneValue */
        start local 3 // boolean valueEqualsOneValue
         6: .line 2913
            iload 2 /* valueEqualsZeroValue */
            ifne 7
            iload 3 /* valueEqualsOneValue */
            ifne 7
            iconst_0
            ireturn
      StackMap locals: int
      StackMap stack:
         7: iconst_1
            ireturn
        end local 3 // boolean valueEqualsOneValue
        end local 2 // boolean valueEqualsZeroValue
        end local 1 // java.lang.Object value
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$SentinelValues this
      LocalVariableTable:
        Start  End  Slot                  Name  Signature
            0    8     0                  this  Lorg/eclipse/collections/impl/map/mutable/primitive/DoubleObjectHashMap$SentinelValues<TV;>;
            0    8     1                 value  TV;
            3    8     2  valueEqualsZeroValue  Z
            6    8     3   valueEqualsOneValue  Z
    Signature: (TV;)Z
    MethodParameters:
       Name  Flags
      value  
}
Signature: <V:Ljava/lang/Object;>Ljava/lang/Object;
SourceFile: "DoubleObjectHashMap.java"
NestHost: org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap
InnerClasses:
  private final SentinelValues = org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$SentinelValues of org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap