| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.ahat.heapdump; |
| |
| import java.util.Iterator; |
| import java.util.NoSuchElementException; |
| |
| /** |
| * Reference iterator used for the dominators computation. |
| * This visits only strong references. |
| */ |
| class DominatorReferenceIterator implements Iterator<AhatInstance>, |
| Iterable<AhatInstance> { |
| private ReferenceIterator mIter; |
| private AhatInstance mNext; |
| |
| public DominatorReferenceIterator(ReferenceIterator iter) { |
| mIter = iter; |
| mNext = null; |
| } |
| |
| @Override |
| public boolean hasNext() { |
| while (mNext == null && mIter.hasNext()) { |
| Reference ref = mIter.next(); |
| if (ref.strong) { |
| mNext = ref.ref; |
| } |
| } |
| return mNext != null; |
| } |
| |
| @Override |
| public AhatInstance next() { |
| if (hasNext()) { |
| AhatInstance next = mNext; |
| mNext = null; |
| return next; |
| } |
| throw new NoSuchElementException(); |
| } |
| |
| @Override |
| public Iterator<AhatInstance> iterator() { |
| return this; |
| } |
| } |