18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.tools.javac.code;
  27 
  28 import com.sun.tools.javac.util.Assert;
  29 import com.sun.tools.javac.util.List;
  30 import java.util.EnumMap;
  31 import java.util.HashSet;
  32 import java.util.Set;
  33 
  34 /**
  35  * TypeMetadata is essentially an immutable {@code EnumMap<Entry.Kind, <? extends Entry>>}
  36  *
  37  * A metadata class represented by a subtype of Entry can express a property on a Type instance.
  38  * Thers should be at most one instance of an Entry per Entry.Kind on any given Type instance.
  39  *
  40  * Metadata classes of a specific kind are responsible for how they combine themselvs.
  41  *
  42  * @implNote {@code Entry:combine} need not be commutative.
  43  */
  44 public class TypeMetadata {
  45     public static final TypeMetadata EMPTY = new TypeMetadata();
  46 
  47     private final EnumMap<Entry.Kind, Entry> contents;
  48 
  49     /**
  50      * Create a new empty TypeMetadata map.
  51      */
  52     private TypeMetadata() {
  53         contents = new EnumMap<>(Entry.Kind.class);
  54     }
  55 
  56     /**
  57      * Create a new TypeMetadata map containing the Entry {@code elem}.
  58      *
  59      * @param elem the sole contents of this map
  60      */

  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.tools.javac.code;
  27 
  28 import com.sun.tools.javac.util.Assert;
  29 import com.sun.tools.javac.util.List;
  30 import java.util.EnumMap;
  31 import java.util.HashSet;
  32 import java.util.Set;
  33 
  34 /**
  35  * TypeMetadata is essentially an immutable {@code EnumMap<Entry.Kind, <? extends Entry>>}
  36  *
  37  * A metadata class represented by a subtype of Entry can express a property on a Type instance.
  38  * There should be at most one instance of an Entry per Entry.Kind on any given Type instance.
  39  *
  40  * Metadata classes of a specific kind are responsible for how they combine themselves.
  41  *
  42  * @implNote {@code Entry:combine} need not be commutative.
  43  */
  44 public class TypeMetadata {
  45     public static final TypeMetadata EMPTY = new TypeMetadata();
  46 
  47     private final EnumMap<Entry.Kind, Entry> contents;
  48 
  49     /**
  50      * Create a new empty TypeMetadata map.
  51      */
  52     private TypeMetadata() {
  53         contents = new EnumMap<>(Entry.Kind.class);
  54     }
  55 
  56     /**
  57      * Create a new TypeMetadata map containing the Entry {@code elem}.
  58      *
  59      * @param elem the sole contents of this map
  60      */