// Copyright (c) 2016, 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.graph;

import com.android.tools.r8.dex.IndexedItemCollection;
import com.android.tools.r8.dex.MixedSectionCollection;
import java.util.Arrays;

public class DexAnnotationSet extends CachedHashValueDexItem {

  private static final int UNSORTED = 0;
  private static final DexAnnotationSet THE_EMPTY_ANNOTATIONS_SET =
      new DexAnnotationSet(new DexAnnotation[0]);

  public final DexAnnotation[] annotations;
  private int sorted = UNSORTED;

  public DexAnnotationSet(DexAnnotation[] annotations) {
    this.annotations = annotations;
  }

  public static DexAnnotationSet empty() {
    return THE_EMPTY_ANNOTATIONS_SET;
  }

  @Override
  public int computeHashCode() {
    return Arrays.hashCode(annotations);
  }

  @Override
  public boolean computeEquals(Object other) {
    if (other instanceof DexAnnotationSet) {
      DexAnnotationSet o = (DexAnnotationSet) other;
      return Arrays.equals(annotations, o.annotations);
    }
    return false;
  }

  @Override
  public void collectIndexedItems(IndexedItemCollection indexedItems) {
    collectAll(indexedItems, annotations);
  }

  @Override
  void collectMixedSectionItems(MixedSectionCollection mixedItems) {
    mixedItems.add(this);
    collectAll(mixedItems, annotations);
  }

  public boolean isEmpty() {
    return annotations.length == 0;
  }

  public void sort() {
    if (sorted != UNSORTED) {
      assert sorted == sortedHashCode();
      return;
    }
    Arrays.sort(annotations, (a, b) -> a.annotation.type.compareTo(b.annotation.type));
    for (DexAnnotation annotation : annotations) {
      annotation.annotation.sort();
    }
    sorted = hashCode();
  }

  public DexAnnotation getFirstMatching(DexType type) {
    for (DexAnnotation annotation : annotations) {
      if (annotation.annotation.type == type) {
        return annotation;
      }
    }
    return null;
  }

  private int sortedHashCode() {
    int hashCode = hashCode();
    return hashCode == UNSORTED ? 1 : hashCode;
  }
}