/*
* Copyright 2015 Goldman Sachs.
*
* 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.gs.collections.impl.bag.mutable;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.Iterator;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import com.gs.collections.api.LazyIterable;
import com.gs.collections.api.RichIterable;
import com.gs.collections.api.bag.ImmutableBag;
import com.gs.collections.api.bag.MutableBag;
import com.gs.collections.api.bag.primitive.MutableBooleanBag;
import com.gs.collections.api.bag.primitive.MutableByteBag;
import com.gs.collections.api.bag.primitive.MutableCharBag;
import com.gs.collections.api.bag.primitive.MutableDoubleBag;
import com.gs.collections.api.bag.primitive.MutableFloatBag;
import com.gs.collections.api.bag.primitive.MutableIntBag;
import com.gs.collections.api.bag.primitive.MutableLongBag;
import com.gs.collections.api.bag.primitive.MutableShortBag;
import com.gs.collections.api.block.function.Function;
import com.gs.collections.api.block.function.Function2;
import com.gs.collections.api.block.function.primitive.BooleanFunction;
import com.gs.collections.api.block.function.primitive.ByteFunction;
import com.gs.collections.api.block.function.primitive.CharFunction;
import com.gs.collections.api.block.function.primitive.DoubleFunction;
import com.gs.collections.api.block.function.primitive.FloatFunction;
import com.gs.collections.api.block.function.primitive.IntFunction;
import com.gs.collections.api.block.function.primitive.LongFunction;
import com.gs.collections.api.block.function.primitive.ShortFunction;
import com.gs.collections.api.block.predicate.Predicate;
import com.gs.collections.api.block.predicate.Predicate2;
import com.gs.collections.api.block.predicate.primitive.IntPredicate;
import com.gs.collections.api.block.procedure.Procedure;
import com.gs.collections.api.block.procedure.primitive.ObjectIntProcedure;
import com.gs.collections.api.collection.primitive.MutableBooleanCollection;
import com.gs.collections.api.collection.primitive.MutableByteCollection;
import com.gs.collections.api.collection.primitive.MutableCharCollection;
import com.gs.collections.api.collection.primitive.MutableDoubleCollection;
import com.gs.collections.api.collection.primitive.MutableFloatCollection;
import com.gs.collections.api.collection.primitive.MutableIntCollection;
import com.gs.collections.api.collection.primitive.MutableLongCollection;
import com.gs.collections.api.collection.primitive.MutableShortCollection;
import com.gs.collections.api.list.MutableList;
import com.gs.collections.api.map.MutableMap;
import com.gs.collections.api.multimap.bag.MutableBagMultimap;
import com.gs.collections.api.ordered.OrderedIterable;
import com.gs.collections.api.partition.bag.PartitionMutableBag;
import com.gs.collections.api.set.MutableSet;
import com.gs.collections.api.tuple.Pair;
import com.gs.collections.api.tuple.primitive.ObjectIntPair;
import com.gs.collections.impl.collection.mutable.AbstractMultiReaderMutableCollection;
import com.gs.collections.impl.factory.Bags;
import com.gs.collections.impl.factory.Iterables;
import com.gs.collections.impl.utility.LazyIterate;
/**
* MultiReaderHashBag provides a thread-safe wrapper around a HashBag, using a ReentrantReadWriteLock. In order to
* provide true thread-safety, MultiReaderHashBag does not implement iterator() as this method requires an external lock
* to be taken to provide thread-safe iteration. All of these methods are available however, if you use the
* withReadLockAndDelegate() or withWriteLockAndDelegate() methods. Both of these methods take a parameter of type
* Procedure<MutableBag>, and a wrapped version of the underlying HashBag is returned. This wrapper guarantees that
* no external pointer can ever reference the underlying HashBag outside of a locked procedure. In the case of the
* read lock method, an Unmodifiable version of the collection is offered, which will throw UnsupportedOperationExceptions
* on any write methods like add or remove.
*/
public final class MultiReaderHashBag<T>
extends AbstractMultiReaderMutableCollection<T>
implements Externalizable, MutableBag<T>
{
private static final long serialVersionUID = 1L;
private transient ReadWriteLock lock;
private MutableBag<T> delegate;
/**
* @deprecated Empty default constructor used for serialization.
*/
@SuppressWarnings("UnusedDeclaration")
@Deprecated
public MultiReaderHashBag()
{
// For Externalizable use only
}
private MultiReaderHashBag(MutableBag<T> newDelegate)
{
this(newDelegate, new ReentrantReadWriteLock());
}
private MultiReaderHashBag(MutableBag<T> newDelegate, ReadWriteLock newLock)
{
this.lock = newLock;
this.delegate = newDelegate;
}
public static <T> MultiReaderHashBag<T> newBag()
{
return new MultiReaderHashBag<T>(HashBag.<T>newBag());
}
public static <T> MultiReaderHashBag<T> newBag(int capacity)
{
return new MultiReaderHashBag<T>(HashBag.<T>newBag(capacity));
}
public static <T> MultiReaderHashBag<T> newBag(Iterable<T> iterable)
{
return new MultiReaderHashBag<T>(HashBag.newBag(iterable));
}
public static <T> MultiReaderHashBag<T> newBagWith(T... elements)
{
return new MultiReaderHashBag<T>(HashBag.newBagWith(elements));
}
@Override
protected MutableBag<T> getDelegate()
{
return this.delegate;
}
@Override
protected ReadWriteLock getLock()
{
return this.lock;
}
UntouchableMutableBag<T> asReadUntouchable()
{
return new UntouchableMutableBag<T>(this.delegate.asUnmodifiable());
}
UntouchableMutableBag<T> asWriteUntouchable()
{
return new UntouchableMutableBag<T>(this.delegate);
}
public void withReadLockAndDelegate(Procedure<MutableBag<T>> procedure)
{
this.acquireReadLock();
try
{
UntouchableMutableBag<T> bag = this.asReadUntouchable();
procedure.value(bag);
bag.becomeUseless();
}
finally
{
this.unlockReadLock();
}
}
public void withWriteLockAndDelegate(Procedure<MutableBag<T>> procedure)
{
this.acquireWriteLock();
try
{
UntouchableMutableBag<T> bag = this.asWriteUntouchable();
procedure.value(bag);
bag.becomeUseless();
}
finally
{
this.unlockWriteLock();
}
}
public MutableBag<T> asSynchronized()
{
this.acquireReadLock();
try
{
return SynchronizedBag.of(this);
}
finally
{
this.unlockReadLock();
}
}
public MutableBag<T> asUnmodifiable()
{
this.acquireReadLock();
try
{
return UnmodifiableBag.of(this);
}
finally
{
this.unlockReadLock();
}
}
public ImmutableBag<T> toImmutable()
{
this.acquireReadLock();
try
{
return Bags.immutable.withAll(this.delegate);
}
finally
{
this.unlockReadLock();
}
}
public void addOccurrences(T item, int occurrences)
{
this.acquireWriteLock();
try
{
this.delegate.addOccurrences(item, occurrences);
}
finally
{
this.unlockWriteLock();
}
}
public boolean removeOccurrences(Object item, int occurrences)
{
this.acquireWriteLock();
try
{
return this.delegate.removeOccurrences(item, occurrences);
}
finally
{
this.unlockWriteLock();
}
}
public boolean setOccurrences(T item, int occurrences)
{
this.acquireWriteLock();
try
{
return this.delegate.setOccurrences(item, occurrences);
}
finally
{
this.unlockWriteLock();
}
}
public int occurrencesOf(Object item)
{
this.acquireReadLock();
try
{
return this.delegate.occurrencesOf(item);
}
finally
{
this.unlockReadLock();
}
}
public int sizeDistinct()
{
this.acquireReadLock();
try
{
return this.delegate.sizeDistinct();
}
finally
{
this.unlockReadLock();
}
}
public <V> MutableBag<V> collect(Function<? super T, ? extends V> function)
{
this.acquireReadLock();
try
{
return this.delegate.collect(function);
}
finally
{
this.unlockReadLock();
}
}
public MutableBooleanBag collectBoolean(BooleanFunction<? super T> booleanFunction)
{
this.acquireReadLock();
try
{
return this.delegate.collectBoolean(booleanFunction);
}
finally
{
this.unlockReadLock();
}
}
public MutableByteBag collectByte(ByteFunction<? super T> byteFunction)
{
this.acquireReadLock();
try
{
return this.delegate.collectByte(byteFunction);
}
finally
{
this.unlockReadLock();
}
}
public MutableCharBag collectChar(CharFunction<? super T> charFunction)
{
this.acquireReadLock();
try
{
return this.delegate.collectChar(charFunction);
}
finally
{
this.unlockReadLock();
}
}
public MutableDoubleBag collectDouble(DoubleFunction<? super T> doubleFunction)
{
this.acquireReadLock();
try
{
return this.delegate.collectDouble(doubleFunction);
}
finally
{
this.unlockReadLock();
}
}
public MutableFloatBag collectFloat(FloatFunction<? super T> floatFunction)
{
this.acquireReadLock();
try
{
return this.delegate.collectFloat(floatFunction);
}
finally
{
this.unlockReadLock();
}
}
public MutableIntBag collectInt(IntFunction<? super T> intFunction)
{
this.acquireReadLock();
try
{
return this.delegate.collectInt(intFunction);
}
finally
{
this.unlockReadLock();
}
}
public MutableLongBag collectLong(LongFunction<? super T> longFunction)
{
this.acquireReadLock();
try
{
return this.delegate.collectLong(longFunction);
}
finally
{
this.unlockReadLock();
}
}
public MutableShortBag collectShort(ShortFunction<? super T> shortFunction)
{
this.acquireReadLock();
try
{
return this.delegate.collectShort(shortFunction);
}
finally
{
this.unlockReadLock();
}
}
public <V> MutableBag<V> flatCollect(
Function<? super T, ? extends Iterable<V>> function)
{
this.acquireReadLock();
try
{
return this.delegate.flatCollect(function);
}
finally
{
this.unlockReadLock();
}
}
public MutableList<ObjectIntPair<T>> topOccurrences(int count)
{
this.acquireReadLock();
try
{
return this.delegate.topOccurrences(count);
}
finally
{
this.unlockReadLock();
}
}
public MutableList<ObjectIntPair<T>> bottomOccurrences(int count)
{
this.acquireReadLock();
try
{
return this.delegate.bottomOccurrences(count);
}
finally
{
this.unlockReadLock();
}
}
public <V> MutableBag<V> collectIf(
Predicate<? super T> predicate,
Function<? super T, ? extends V> function)
{
this.acquireReadLock();
try
{
return this.delegate.collectIf(predicate, function);
}
finally
{
this.unlockReadLock();
}
}
public <P, V> MutableBag<V> collectWith(
Function2<? super T, ? super P, ? extends V> function,
P parameter)
{
this.acquireReadLock();
try
{
return this.delegate.collectWith(function, parameter);
}
finally
{
this.unlockReadLock();
}
}
public MutableBag<T> newEmpty()
{
return MultiReaderHashBag.newBag();
}
public MutableBag<T> reject(Predicate<? super T> predicate)
{
this.acquireReadLock();
try
{
return this.delegate.reject(predicate);
}
finally
{
this.unlockReadLock();
}
}
public <P> MutableBag<T> rejectWith(
Predicate2<? super T, ? super P> predicate,
P parameter)
{
this.acquireReadLock();
try
{
return this.delegate.rejectWith(predicate, parameter);
}
finally
{
this.unlockReadLock();
}
}
public MutableBag<T> tap(Procedure<? super T> procedure)
{
this.acquireReadLock();
try
{
this.forEach(procedure);
return this;
}
finally
{
this.unlockReadLock();
}
}
public MutableBag<T> select(Predicate<? super T> predicate)
{
this.acquireReadLock();
try
{
return this.delegate.select(predicate);
}
finally
{
this.unlockReadLock();
}
}
public <P> MutableBag<T> selectWith(
Predicate2<? super T, ? super P> predicate,
P parameter)
{
this.acquireReadLock();
try
{
return this.delegate.selectWith(predicate, parameter);
}
finally
{
this.unlockReadLock();
}
}
public MutableBag<T> selectByOccurrences(IntPredicate predicate)
{
this.acquireReadLock();
try
{
return this.delegate.selectByOccurrences(predicate);
}
finally
{
this.unlockReadLock();
}
}
public <S> MutableBag<S> selectInstancesOf(Class<S> clazz)
{
this.acquireReadLock();
try
{
return this.delegate.selectInstancesOf(clazz);
}
finally
{
this.unlockReadLock();
}
}
public PartitionMutableBag<T> partition(Predicate<? super T> predicate)
{
this.acquireReadLock();
try
{
return this.delegate.partition(predicate);
}
finally
{
this.unlockReadLock();
}
}
public <P> PartitionMutableBag<T> partitionWith(Predicate2<? super T, ? super P> predicate, P parameter)
{
this.acquireReadLock();
try
{
return this.delegate.partitionWith(predicate, parameter);
}
finally
{
this.unlockReadLock();
}
}
public MutableBag<T> with(T element)
{
this.add(element);
return this;
}
public MutableBag<T> without(T element)
{
this.remove(element);
return this;
}
public MutableBag<T> withAll(Iterable<? extends T> elements)
{
this.addAllIterable(elements);
return this;
}
public MutableBag<T> withoutAll(Iterable<? extends T> elements)
{
this.removeAllIterable(elements);
return this;
}
public MutableMap<T, Integer> toMapOfItemToCount()
{
this.acquireReadLock();
try
{
return this.delegate.toMapOfItemToCount();
}
finally
{
this.unlockReadLock();
}
}
public String toStringOfItemToCount()
{
this.acquireReadLock();
try
{
return this.delegate.toStringOfItemToCount();
}
finally
{
this.unlockReadLock();
}
}
public <V> MutableBagMultimap<V, T> groupBy(Function<? super T, ? extends V> function)
{
this.acquireReadLock();
try
{
return this.delegate.groupBy(function);
}
finally
{
this.unlockReadLock();
}
}
public <V> MutableBagMultimap<V, T> groupByEach(Function<? super T, ? extends Iterable<V>> function)
{
this.acquireReadLock();
try
{
return this.delegate.groupByEach(function);
}
finally
{
this.unlockReadLock();
}
}
public <V> MutableMap<V, T> groupByUniqueKey(Function<? super T, ? extends V> function)
{
this.acquireReadLock();
try
{
return this.delegate.groupByUniqueKey(function);
}
finally
{
this.unlockReadLock();
}
}
/**
* @deprecated in 6.0. Use {@link OrderedIterable#zip(Iterable)} instead.
*/
@Deprecated
public <S> MutableBag<Pair<T, S>> zip(Iterable<S> that)
{
this.acquireReadLock();
try
{
return this.delegate.zip(that);
}
finally
{
this.unlockReadLock();
}
}
/**
* @deprecated in 6.0. Use {@link OrderedIterable#zipWithIndex()} instead.
*/
@Deprecated
public MutableSet<Pair<T, Integer>> zipWithIndex()
{
this.acquireReadLock();
try
{
return this.delegate.zipWithIndex();
}
finally
{
this.unlockReadLock();
}
}
public RichIterable<RichIterable<T>> chunk(int size)
{
this.acquireReadLock();
try
{
return this.delegate.chunk(size);
}
finally
{
this.unlockReadLock();
}
}
public void forEachWithOccurrences(ObjectIntProcedure<? super T> procedure)
{
this.acquireReadLock();
try
{
this.delegate.forEachWithOccurrences(procedure);
}
finally
{
this.unlockReadLock();
}
}
@Override
public boolean equals(Object o)
{
this.acquireReadLock();
try
{
return this.delegate.equals(o);
}
finally
{
this.unlockReadLock();
}
}
@Override
public int hashCode()
{
this.acquireReadLock();
try
{
return this.delegate.hashCode();
}
finally
{
this.unlockReadLock();
}
}
public void writeExternal(ObjectOutput out) throws IOException
{
out.writeObject(this.delegate);
}
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException
{
this.delegate = (MutableBag<T>) in.readObject();
this.lock = new ReentrantReadWriteLock();
}
//Exposed for testing
static final class UntouchableMutableBag<T>
extends UntouchableMutableCollection<T>
implements MutableBag<T>
{
private final MutableList<UntouchableIterator<T>> requestedIterators = Iterables.mList();
private UntouchableMutableBag(MutableBag<T> newDelegate)
{
this.delegate = newDelegate;
}
public void becomeUseless()
{
this.delegate = null;
this.requestedIterators.forEach(new Procedure<UntouchableIterator<T>>()
{
public void value(UntouchableIterator<T> each)
{
each.becomeUseless();
}
});
}
public MutableBag<T> with(T element)
{
this.add(element);
return this;
}
public MutableBag<T> without(T element)
{
this.remove(element);
return this;
}
public MutableBag<T> withAll(Iterable<? extends T> elements)
{
this.addAllIterable(elements);
return this;
}
public MutableBag<T> withoutAll(Iterable<? extends T> elements)
{
this.removeAllIterable(elements);
return this;
}
public MutableBag<T> asSynchronized()
{
throw new UnsupportedOperationException("cannot wrap an UntouchableMutableBag");
}
public MutableBag<T> asUnmodifiable()
{
throw new UnsupportedOperationException("cannot wrap an UntouchableMutableBag");
}
public ImmutableBag<T> toImmutable()
{
return Bags.immutable.withAll(this.getDelegate());
}
public LazyIterable<T> asLazy()
{
return LazyIterate.adapt(this);
}
public Iterator<T> iterator()
{
UntouchableIterator<T> iterator = new UntouchableIterator<T>(this.delegate.iterator());
this.requestedIterators.add(iterator);
return iterator;
}
public void addOccurrences(T item, int occurrences)
{
this.getDelegate().addOccurrences(item, occurrences);
}
public boolean removeOccurrences(Object item, int occurrences)
{
return this.getDelegate().removeOccurrences(item, occurrences);
}
public boolean setOccurrences(T item, int occurrences)
{
return this.getDelegate().setOccurrences(item, occurrences);
}
public int occurrencesOf(Object item)
{
return this.getDelegate().occurrencesOf(item);
}
public int sizeDistinct()
{
return this.getDelegate().sizeDistinct();
}
public <V> MutableBag<V> collect(Function<? super T, ? extends V> function)
{
return this.getDelegate().collect(function);
}
public MutableBooleanBag collectBoolean(BooleanFunction<? super T> booleanFunction)
{
return this.getDelegate().collectBoolean(booleanFunction);
}
public <R extends MutableBooleanCollection> R collectBoolean(BooleanFunction<? super T> booleanFunction, R target)
{
return this.getDelegate().collectBoolean(booleanFunction, target);
}
public MutableByteBag collectByte(ByteFunction<? super T> byteFunction)
{
return this.getDelegate().collectByte(byteFunction);
}
public <R extends MutableByteCollection> R collectByte(ByteFunction<? super T> byteFunction, R target)
{
return this.getDelegate().collectByte(byteFunction, target);
}
public MutableCharBag collectChar(CharFunction<? super T> charFunction)
{
return this.getDelegate().collectChar(charFunction);
}
public <R extends MutableCharCollection> R collectChar(CharFunction<? super T> charFunction, R target)
{
return this.getDelegate().collectChar(charFunction, target);
}
public MutableDoubleBag collectDouble(DoubleFunction<? super T> doubleFunction)
{
return this.getDelegate().collectDouble(doubleFunction);
}
public <R extends MutableDoubleCollection> R collectDouble(DoubleFunction<? super T> doubleFunction, R target)
{
return this.getDelegate().collectDouble(doubleFunction, target);
}
public MutableFloatBag collectFloat(FloatFunction<? super T> floatFunction)
{
return this.getDelegate().collectFloat(floatFunction);
}
public <R extends MutableFloatCollection> R collectFloat(FloatFunction<? super T> floatFunction, R target)
{
return this.getDelegate().collectFloat(floatFunction, target);
}
public MutableIntBag collectInt(IntFunction<? super T> intFunction)
{
return this.getDelegate().collectInt(intFunction);
}
public <R extends MutableIntCollection> R collectInt(IntFunction<? super T> intFunction, R target)
{
return this.getDelegate().collectInt(intFunction, target);
}
public MutableLongBag collectLong(LongFunction<? super T> longFunction)
{
return this.getDelegate().collectLong(longFunction);
}
public <R extends MutableLongCollection> R collectLong(LongFunction<? super T> longFunction, R target)
{
return this.getDelegate().collectLong(longFunction, target);
}
public MutableShortBag collectShort(ShortFunction<? super T> shortFunction)
{
return this.getDelegate().collectShort(shortFunction);
}
public <R extends MutableShortCollection> R collectShort(ShortFunction<? super T> shortFunction, R target)
{
return this.getDelegate().collectShort(shortFunction, target);
}
public <V> MutableBag<V> flatCollect(Function<? super T, ? extends Iterable<V>> function)
{
return this.getDelegate().flatCollect(function);
}
public MutableList<ObjectIntPair<T>> topOccurrences(int count)
{
return this.getDelegate().topOccurrences(count);
}
public MutableList<ObjectIntPair<T>> bottomOccurrences(int count)
{
return this.getDelegate().bottomOccurrences(count);
}
public <V> MutableBag<V> collectIf(
Predicate<? super T> predicate,
Function<? super T, ? extends V> function)
{
return this.getDelegate().collectIf(predicate, function);
}
public <P, V> MutableBag<V> collectWith(
Function2<? super T, ? super P, ? extends V> function,
P parameter)
{
return this.getDelegate().collectWith(function, parameter);
}
public <V> MutableBagMultimap<V, T> groupBy(Function<? super T, ? extends V> function)
{
return this.getDelegate().groupBy(function);
}
public <V> MutableBagMultimap<V, T> groupByEach(Function<? super T, ? extends Iterable<V>> function)
{
return this.getDelegate().groupByEach(function);
}
public <V> MutableMap<V, T> groupByUniqueKey(Function<? super T, ? extends V> function)
{
return this.getDelegate().groupByUniqueKey(function);
}
public MutableBag<T> newEmpty()
{
return this.getDelegate().newEmpty();
}
public MutableBag<T> reject(Predicate<? super T> predicate)
{
return this.getDelegate().reject(predicate);
}
public <P> MutableBag<T> rejectWith(
Predicate2<? super T, ? super P> predicate,
P parameter)
{
return this.getDelegate().rejectWith(predicate, parameter);
}
public MutableBag<T> tap(Procedure<? super T> procedure)
{
this.forEach(procedure);
return this;
}
public MutableBag<T> select(Predicate<? super T> predicate)
{
return this.getDelegate().select(predicate);
}
public <P> MutableBag<T> selectWith(
Predicate2<? super T, ? super P> predicate,
P parameter)
{
return this.getDelegate().selectWith(predicate, parameter);
}
public MutableBag<T> selectByOccurrences(IntPredicate predicate)
{
return this.getDelegate().selectByOccurrences(predicate);
}
public <S> MutableBag<S> selectInstancesOf(Class<S> clazz)
{
return this.getDelegate().selectInstancesOf(clazz);
}
public void forEachWithOccurrences(ObjectIntProcedure<? super T> procedure)
{
this.getDelegate().forEachWithOccurrences(procedure);
}
public PartitionMutableBag<T> partition(Predicate<? super T> predicate)
{
return this.getDelegate().partition(predicate);
}
public <P> PartitionMutableBag<T> partitionWith(Predicate2<? super T, ? super P> predicate, P parameter)
{
return this.getDelegate().partitionWith(predicate, parameter);
}
/**
* @deprecated in 6.0. Use {@link OrderedIterable#zip(Iterable)} instead.
*/
@Deprecated
public <S> MutableBag<Pair<T, S>> zip(Iterable<S> that)
{
return this.getDelegate().zip(that);
}
/**
* @deprecated in 6.0. Use {@link OrderedIterable#zipWithIndex()} instead.
*/
@Deprecated
public MutableSet<Pair<T, Integer>> zipWithIndex()
{
return this.getDelegate().zipWithIndex();
}
public MutableMap<T, Integer> toMapOfItemToCount()
{
return this.getDelegate().toMapOfItemToCount();
}
public String toStringOfItemToCount()
{
return this.getDelegate().toStringOfItemToCount();
}
private MutableBag<T> getDelegate()
{
return (MutableBag<T>) this.delegate;
}
}
private static final class UntouchableIterator<T>
implements Iterator<T>
{
private Iterator<T> delegate;
private UntouchableIterator(Iterator<T> newDelegate)
{
this.delegate = newDelegate;
}
public boolean hasNext()
{
return this.delegate.hasNext();
}
public T next()
{
return this.delegate.next();
}
public void remove()
{
this.delegate.remove();
}
public void becomeUseless()
{
this.delegate = null;
}
}
}