src/main/java/com/android/tools/r8/graph/ClassKind.java

package com.android.tools.r8.graph;

import com.android.tools.r8.Resource;
import java.util.function.Consumer;
import java.util.function.Predicate;

/** Kind of the application class. Can be program, classpath or library. */
public enum ClassKind {
  PROGRAM(DexProgramClass::new, DexClass::isProgramClass),
  CLASSPATH(DexClasspathClass::new, DexClass::isClasspathClass),
  LIBRARY(DexLibraryClass::new, DexClass::isLibraryClass);

  private interface Factory {
    DexClass create(DexType type, Resource.Kind origin, DexAccessFlags accessFlags,
        DexType superType,
        DexTypeList interfaces, DexString sourceFile, DexAnnotationSet annotations,
        DexEncodedField[] staticFields, DexEncodedField[] instanceFields,
        DexEncodedMethod[] directMethods, DexEncodedMethod[] virtualMethods);
  }

  private final Factory factory;
  private final Predicate<DexClass> check;

  ClassKind(Factory factory, Predicate<DexClass> check) {
    this.factory = factory;
    this.check = check;
  }

  public DexClass create(
      DexType type, Resource.Kind origin, DexAccessFlags accessFlags, DexType superType,
      DexTypeList interfaces, DexString sourceFile, DexAnnotationSet annotations,
      DexEncodedField[] staticFields, DexEncodedField[] instanceFields,
      DexEncodedMethod[] directMethods, DexEncodedMethod[] virtualMethods) {
    return factory.create(type, origin, accessFlags, superType, interfaces, sourceFile,
        annotations, staticFields, instanceFields, directMethods, virtualMethods);
  }

  public boolean isOfKind(DexClass clazz) {
    return check.test(clazz);
  }

  public <T extends DexClass> Consumer<DexClass> bridgeConsumer(Consumer<T> consumer) {
    return clazz -> {
      assert isOfKind(clazz);
      @SuppressWarnings("unchecked") T specialized = (T) clazz;
      consumer.accept(specialized);
    };
  }
}