src/main/java/com/android/tools/r8/profile/art/EmptyArtProfileCollection.java

// Copyright (c) 2022, the R8 project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

package com.android.tools.r8.profile.art;

import com.android.tools.r8.graph.AppInfo;
import com.android.tools.r8.graph.AppView;
import com.android.tools.r8.graph.PrunedItems;
import com.android.tools.r8.graph.lens.GraphLens;
import com.android.tools.r8.naming.NamingLens;
import com.android.tools.r8.utils.IteratorUtils;
import com.android.tools.r8.utils.timing.Timing;
import java.util.Iterator;

public class EmptyArtProfileCollection extends ArtProfileCollection {

  private static final EmptyArtProfileCollection INSTANCE = new EmptyArtProfileCollection();

  private EmptyArtProfileCollection() {}

  static EmptyArtProfileCollection getInstance() {
    return INSTANCE;
  }

  @Override
  public boolean isEmpty() {
    return true;
  }

  @Override
  public boolean isNonEmpty() {
    return false;
  }

  @Override
  public Iterator<ArtProfile> iterator() {
    return IteratorUtils.empty();
  }

  @Override
  public NonEmptyArtProfileCollection asNonEmpty() {
    return null;
  }

  @Override
  public ArtProfileCollection rewrittenWithLens(AppView<?> appView, GraphLens lens, Timing timing) {
    return this;
  }

  @Override
  public ArtProfileCollection rewrittenWithLens(AppView<?> appView, NamingLens lens) {
    return this;
  }

  @Override
  public void supplyConsumers(AppView<?> appView) {
    assert appView.options().getArtProfileOptions().getArtProfilesForRewriting().isEmpty();
  }

  @Override
  public ArtProfileCollection transformForR8Partial(AppView<AppInfo> appView) {
    return this;
  }

  @Override
  public ArtProfileCollection withoutMissingItems(AppView<?> appView) {
    return this;
  }

  @Override
  public ArtProfileCollection withoutPrunedItems(PrunedItems prunedItems, Timing timing) {
    return this;
  }
}