Commons Collections僥楼永芝?屈? - 園殻秘壇利
作者 佚名技术
来源 NET编程
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发布时间 2012-06-16
| return new BagIterator(this); } static class BagIterator implements Iterator { private AbstractMapBag parent; private Iterator entryIterator; private Map.Entry current; private int itemCount; private final int mods; private boolean canRemove; public BagIterator(AbstractMapBag parent) { this.parent = parent; this.entryIterator = parent.map.entrySet().iterator(); this.current = null; this.mods = parent.modCount; this.canRemove = false; } public boolean hasNext() { return (itemCount > 0 || entryIterator.hasNext()); } public Object next() { if (parent.modCount != mods) { throw new ConcurrentModificationException(); } if (itemCount == 0) { current = (Map.Entry) entryIterator.next(); itemCount = ((MutableInteger) current.getValue()).value; } canRemove = true; itemCount--; return current.getKey(); } public void remove() { if (parent.modCount != mods) { throw new ConcurrentModificationException(); } if (canRemove == false) { throw new IllegalStateException(); } MutableInteger mut = (MutableInteger) current.getValue(); if (mut.value > 1) { mut.value--; } else { entryIterator.remove(); } parent.size--; canRemove = false; } } public boolean add(Object object) { return add(object, 1); } public boolean add(Object object, int nCopies) { modCount++; if (nCopies > 0) { MutableInteger mut = (MutableInteger) map.get(object); size += nCopies; if (mut == null) { map.put(object, new MutableInteger(nCopies)); return true; } else { mut.value += nCopies; return false; } } else { return false; } } public boolean addAll(Collection coll) { boolean changed = false; Iterator i = coll.iterator(); while (i.hasNext()) { boolean added = add(i.next()); changed = changed || added; } return changed; } public void clear() { modCount++; map.clear(); size = 0; } public boolean remove(Object object) { MutableInteger mut = (MutableInteger) map.get(object); if (mut == null) { return false; } modCount++; map.remove(object); size -= mut.value; return true; } public boolean remove(Object object, int nCopies) { Mutabl |
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