1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.ahat.heapdump; 18 19 import java.util.Iterator; 20 import java.util.NoSuchElementException; 21 22 /** 23 * An iterator that skips over nulls. 24 */ 25 class SkipNullsIterator<T> implements Iterator<T>, Iterable<T> { 26 Iterator<T> mIter; 27 private T mNext; 28 29 public SkipNullsIterator(Iterable<T> iterable) { 30 mIter = iterable.iterator(); 31 mNext = null; 32 } 33 34 @Override 35 public boolean hasNext() { 36 while (mNext == null && mIter.hasNext()) { 37 mNext = mIter.next(); 38 } 39 return mNext != null; 40 } 41 42 @Override 43 public T next() { 44 if (!hasNext()) { 45 throw new NoSuchElementException(); 46 } 47 T next = mNext; 48 mNext = null; 49 return next; 50 } 51 52 @Override 53 public Iterator<T> iterator() { 54 return this; 55 } 56 } 57
