public abstract class AbstractBagDecorator extends AbstractCollectionDecorator implements Bag {
protected AbstractBagDecorator() {
super();
}
protected AbstractBagDecorator(Bag bag) {
super(bag);
}
protected Bag getBag() {
return (Bag) getCollection();
}
public int getCount(Object object) {
return getBag().getCount(object);
}
public boolean add(Object object, int count) {
return getBag().add(object, count);
}
public boolean remove(Object object, int count) {
return getBag().remove(object, count);
}
public Set uniqueSet() {
return getBag().uniqueSet();
}
}
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public abstract class AbstractSortedBagDecorator extends AbstractBagDecorator implements SortedBag
{
protected AbstractSortedBagDecorator() {
super();
}
protected AbstractSortedBagDecorator(SortedBag bag) {
super(bag);
}
protected SortedBag getSortedBag() {
return (SortedBag) getCollection();
}
public Object first() {
return getSortedBag().first();
}
public Object last() {
return getSortedBag().last();
}
public Comparator comparator() {
return getSortedBag().comparator();
}
}
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public abstract class AbstractMapBag implements Bag
{
/** The map to use to store the data */
private transient Map map;
/** The current total size of the bag */
private int size;
/** The modification count for fail fast iterators */
private transient int modCount;
/** The modification count for fail fast iterators */
private transient Set uniqueSet;
protected AbstractMapBag() {
super();
}
protected AbstractMapBag(Map map) {
super();
this.map = map;
}
protected Map getMap() {
return map;
}
public int size() {
return size;
}
public boolean isEmpty() {
return map.isEmpty();
}
public int getCount(Object object) {
MutableInteger count = (MutableInteger) map.get(object);
if (count != null) {
return count.value;
}
return 0;
}
public boolean contains(Object object) {
return map.containsKey(object);
}
public boolean containsAll(Collection coll) {
if (coll instanceof Bag) {
return containsAll((Bag) coll);
}
return containsAll(new HashBag(coll));
}
boolean containsAll(Bag other) {
boolean result = true;
Iterator it = other.uniqueSet().iterator();
while (it.hasNext()) {
Object current = it.next();
boolean contains = getCount(current) >= other.getCount(current);
result = result && contains;
}
return result;
}
public Iterator iterator() {
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) {
MutableInteger mut = (MutableInteger) map.get(object);
if (mut == null) {
return false;
}
if (nCopies <= 0) {
return false;
}
modCount++;
if (nCopies < mut.value) {
mut.value -= nCopies;
size -= nCopies;
} else {
map.remove(object);
size -= mut.value;
}
return true;
}
public boolean removeAll(Collection coll) {
boolean result = false;
if (coll != null) {
Iterator i = coll.iterator();
while (i.hasNext()) {
boolean changed = remove(i.next(), 1);
result = result || changed;
}
}
return result;
}
public boolean retainAll(Collection coll) {
if (coll instanceof Bag) {
return retainAll((Bag) coll);
}
return retainAll(new HashBag(coll));
}
boolean retainAll(Bag other) {
boolean result = false;
Bag excess = new HashBag();
Iterator i = uniqueSet().iterator();
while (i.hasNext()) {
Object current = i.next();
int myCount = getCount(current);
int otherCount = other.getCount(current);
if (1 <= otherCount && otherCount <= myCount) {
excess.add(current, myCount - otherCount);
} else {
excess.add(current, myCount);
}
}
if (!excess.isEmpty()) {
result = removeAll(excess);
}
return result;
}
protected static class MutableInteger
{
/** The value of this mutable. */
protected int value;
MutableInteger(int value) {
this.value = value;
}
public boolean equals(Object obj) {
if (obj instanceof MutableInteger == false) {
return false;
}
return ((MutableInteger) obj).value == value;
}
public int hashCode() {
return value;
}
}
public Object[] toArray() {
Object[] result = new Object[size()];
int i = 0;
Iterator it = map.keySet().iterator();
while (it.hasNext()) {
Object current = it.next();
for (int index = getCount(current); index > 0; index--) {
result[i++] = current;
}
}
return result;
}
public Object[] toArray(Object[] array) {
int size = size();
if (array.length < size) {
array = (Object[]) Array.newInstance(array.getClass().getComponentType(), size);
}
int i = 0;
Iterator it = map.keySet().iterator();
while (it.hasNext()) {
Object current = it.next();
for (int index = getCount(current); index > 0; index--) {
array[i++] = current;
}
}
if (array.length > size) {
array[size] = null;//截断多余的空位
}
return array;
}
public Set uniqueSet() {
if (uniqueSet == null) {
uniqueSet = UnmodifiableSet.decorate(map.keySet());
}
return uniqueSet;
}
protected void doWriteObject(ObjectOutputStream out) throws IOException {
out.writeInt(map.size());
for (Iterator it = map.entrySet().iterator(); it.hasNext();) {
Map.Entry entry = (Map.Entry) it.next();
out.writeObject(entry.getKey());
out.writeInt(((MutableInteger) entry.getValue()).value);
}
}
protected void doReadObject(Map map, ObjectInputStream in) throws IOException, ClassNotFoundException {
this.map = map;
int entrySize = in.readInt();
for (int i = 0; i < entrySize; i++) {
Object obj = in.readObject();
int count = in.readInt();
map.put(obj, new MutableInteger(count));
size += count;
}
}
public boolean equals(Object object) {
if (object == this) {
return true;
}
if (object instanceof Bag == false) {
return false;
}
Bag other = (Bag) object;
if (other.size() != size()) {
return false;
}
for (Iterator it = map.keySet().iterator(); it.hasNext();) {
Object element = it.next();
if (other.getCount(element) != getCount(element)) {
return false;
}
}
return true;
}
public int hashCode() {
int total = 0;
for (Iterator it = map.entrySet().iterator(); it.hasNext();) {
Map.Entry entry = (Map.Entry) it.next();
Object element = entry.getKey();
MutableInteger count = (MutableInteger) entry.getValue();
total += (element == null ? 0 : element.hashCode()) ^ count.value;
}
return total;
}
public String toString() {
if (size() == 0) {
return "[]";
}
StringBuffer buf = new StringBuffer();
buf.append('[');
Iterator it = uniqueSet().iterator();
while (it.hasNext()) {
Object current = it.next();
int count = getCount(current);
buf.append(count);
buf.append(':');
buf.append(current);
if (it.hasNext()) {
buf.append(',');
}
}
buf.append(']');
return buf.toString();
}
}
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public class HashBag extends AbstractMapBag implements Bag, Serializable
{
private static final long serialVersionUID = -6561115435802554013L;
public HashBag() {
super(new HashMap());
}
public HashBag(Collection coll) {
this();
addAll(coll);
}
private void writeObject(ObjectOutputStream out) throws IOException {
out.defaultWriteObject();
super.doWriteObject(out);
}
private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
in.defaultReadObject();
super.doReadObject(new HashMap(), in);
}
}
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public class TreeBag extends AbstractMapBag implements SortedBag, Serializable
{
private static final long serialVersionUID = -7740146511091606676L;
public TreeBag() {
super(new TreeMap());
}
public TreeBag(Comparator comparator) {
super(new TreeMap(comparator));
}
public TreeBag(Collection coll) {
this();
addAll(coll);
}
public Object first() {
return ((SortedMap) getMap()).firstKey();
}
public Object last() {
return ((SortedMap) getMap()).lastKey();
}
public Comparator comparator() {
return ((SortedMap) getMap()).comparator();
}
private void writeObject(ObjectOutputStream out) throws IOException {
out.defaultWriteObject();
out.writeObject(comparator());
super.doWriteObject(out);
}
private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
in.defaultReadObject();
Comparator comp = (Comparator) in.readObject();
super.doReadObject(new TreeMap(comp), in);
}
}
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public class PredicatedBag extends PredicatedCollection implements Bag
{
private static final long serialVersionUID = -2575833140344736876L;
public static Bag decorate(Bag bag, Predicate predicate) {
return new PredicatedBag(bag, predicate);
}
protected PredicatedBag(Bag bag, Predicate predicate) {
super(bag, predicate);
}
protected Bag getBag() {
return (Bag) getCollection();
}
public boolean add(Object object, int count) {
validate(object);
return getBag().add(object, count);
}
public boolean remove(Object object, int count) {
return getBag().remove(object, count);
}
public Set uniqueSet() {
return getBag().uniqueSet();
}
public int getCount(Object object) {
return getBag().getCount(object);
}
}
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public class PredicatedSortedBag extends PredicatedBag implements SortedBag
{
private static final long serialVersionUID = 3448581314086406616L;
public static SortedBag decorate(SortedBag bag, Predicate predicate) {
return new PredicatedSortedBag(bag, predicate);
}
protected PredicatedSortedBag(SortedBag bag, Predicate predicate) {
super(bag, predicate);
}
protected SortedBag getSortedBag() {
return (SortedBag) getCollection();
}
public Object first() {
return getSortedBag().first();
}
public Object last() {
return getSortedBag().last();
}
public Comparator comparator() {
return getSortedBag().comparator();
}
}
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public class TypedBag
{
public static Bag decorate(Bag bag, Class type) {
return new PredicatedBag(bag, InstanceofPredicate.getInstance(type));
}
protected TypedBag() {
super();
}
}
public class TypedSortedBag
{
public static SortedBag decorate(SortedBag bag, Class type) {
return new PredicatedSortedBag(bag, InstanceofPredicate.getInstance(type));
}
protected TypedSortedBag()
{
super();
}
}
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本文转自Phinecos(洞庭散人)博客园博客，原文链接：http://www.cnblogs.com/phinecos/archive/2008/12/17/1357122.html，如需转载请自行联系原作者
