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GS Collections is a collections framework for Java. It has JDK-compatible List, Set and Map implementations with a rich API and set of utility classes that work with any JDK compatible Collections, Arrays, Maps or Strings. The iteration protocol was inspired by the Smalltalk collection framework.

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/*
 * Copyright 2014 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.list.mutable;

import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.RandomAccess;
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.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.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.ImmutableList;
import com.gs.collections.api.list.MutableList;
import com.gs.collections.api.list.primitive.MutableBooleanList;
import com.gs.collections.api.list.primitive.MutableByteList;
import com.gs.collections.api.list.primitive.MutableCharList;
import com.gs.collections.api.list.primitive.MutableDoubleList;
import com.gs.collections.api.list.primitive.MutableFloatList;
import com.gs.collections.api.list.primitive.MutableIntList;
import com.gs.collections.api.list.primitive.MutableLongList;
import com.gs.collections.api.list.primitive.MutableShortList;
import com.gs.collections.api.map.MutableMap;
import com.gs.collections.api.multimap.list.MutableListMultimap;
import com.gs.collections.api.partition.list.PartitionMutableList;
import com.gs.collections.api.stack.MutableStack;
import com.gs.collections.api.tuple.Pair;
import com.gs.collections.impl.collection.mutable.AbstractMultiReaderMutableCollection;
import com.gs.collections.impl.factory.Lists;
import com.gs.collections.impl.lazy.ReverseIterable;
import com.gs.collections.impl.stack.mutable.ArrayStack;
import com.gs.collections.impl.utility.LazyIterate;

import static com.gs.collections.impl.factory.Iterables.*;

/**
 * MultiReadFastList provides a thread-safe wrapper around a FastList, using a ReentrantReadWriteLock.  In order to
 * provide true thread-safety, MultiReaderFastList does not implement iterator(), listIterator(), listIterator(int), or
 * get(int), as all of these methods require 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, and a wrapped version of the underlying
 * FastList is returned.  This wrapper guarantees that no external pointer can ever reference the underlying FastList
 * 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 MultiReaderFastList
        extends AbstractMultiReaderMutableCollection
        implements RandomAccess, Externalizable, MutableList
{
    private static final long serialVersionUID = 1L;

    private transient ReadWriteLock lock;
    private MutableList delegate;

    @SuppressWarnings("UnusedDeclaration")
    public MultiReaderFastList()
    {
        // For Externalizable use only
    }

    private MultiReaderFastList(MutableList newDelegate)
    {
        this(newDelegate, new ReentrantReadWriteLock());
    }

    private MultiReaderFastList(MutableList newDelegate, ReadWriteLock newLock)
    {
        this.lock = newLock;
        this.delegate = newDelegate;
    }

    public static  MultiReaderFastList newList()
    {
        return new MultiReaderFastList(FastList.newList());
    }

    public static  MultiReaderFastList newList(int capacity)
    {
        return new MultiReaderFastList(FastList.newList(capacity));
    }

    public static  MultiReaderFastList newList(Iterable iterable)
    {
        return new MultiReaderFastList(FastList.newList(iterable));
    }

    public static  MultiReaderFastList newListWith(T... elements)
    {
        return new MultiReaderFastList(FastList.newListWith(elements));
    }

    @Override
    protected MutableList getDelegate()
    {
        return this.delegate;
    }

    @Override
    protected ReadWriteLock getLock()
    {
        return this.lock;
    }

    UntouchableMutableList asReadUntouchable()
    {
        return new UntouchableMutableList(this.delegate.asUnmodifiable());
    }

    UntouchableMutableList asWriteUntouchable()
    {
        return new UntouchableMutableList(this.delegate);
    }

    public void withReadLockAndDelegate(Procedure> procedure)
    {
        this.acquireReadLock();
        try
        {
            UntouchableMutableList list = this.asReadUntouchable();
            procedure.value(list);
            list.becomeUseless();
        }
        finally
        {
            this.unlockReadLock();
        }
    }

    public void withWriteLockAndDelegate(Procedure> procedure)
    {
        this.acquireWriteLock();
        try
        {
            UntouchableMutableList list = this.asWriteUntouchable();
            procedure.value(list);
            list.becomeUseless();
        }
        finally
        {
            this.unlockWriteLock();
        }
    }

    public MutableList asSynchronized()
    {
        this.acquireReadLock();
        try
        {
            return SynchronizedMutableList.of(this);
        }
        finally
        {
            this.unlockReadLock();
        }
    }

    public MutableList asUnmodifiable()
    {
        this.acquireReadLock();
        try
        {
            return UnmodifiableMutableList.of(this);
        }
        finally
        {
            this.unlockReadLock();
        }
    }

    public ImmutableList toImmutable()
    {
        this.acquireReadLock();
        try
        {
            return Lists.immutable.ofAll(this.delegate);
        }
        finally
        {
            this.unlockReadLock();
        }
    }

    @Override
    public MutableList clone()
    {
        this.acquireReadLock();
        try
        {
            return new MultiReaderFastList(this.delegate.clone());
        }
        finally
        {
            this.unlockReadLock();
        }
    }

    public  MutableList collect(Function function)
    {
        this.acquireReadLock();
        try
        {
            return this.delegate.collect(function);
        }
        finally
        {
            this.unlockReadLock();
        }
    }

    public MutableBooleanList collectBoolean(BooleanFunction booleanFunction)
    {
        this.acquireReadLock();
        try
        {
            return this.delegate.collectBoolean(booleanFunction);
        }
        finally
        {
            this.unlockReadLock();
        }
    }

    public MutableByteList collectByte(ByteFunction byteFunction)
    {
        this.acquireReadLock();
        try
        {
            return this.delegate.collectByte(byteFunction);
        }
        finally
        {
            this.unlockReadLock();
        }
    }

    public MutableCharList collectChar(CharFunction charFunction)
    {
        this.acquireReadLock();
        try
        {
            return this.delegate.collectChar(charFunction);
        }
        finally
        {
            this.unlockReadLock();
        }
    }

    public MutableDoubleList collectDouble(DoubleFunction doubleFunction)
    {
        this.acquireReadLock();
        try
        {
            return this.delegate.collectDouble(doubleFunction);
        }
        finally
        {
            this.unlockReadLock();
        }
    }

    public MutableFloatList collectFloat(FloatFunction floatFunction)
    {
        this.acquireReadLock();
        try
        {
            return this.delegate.collectFloat(floatFunction);
        }
        finally
        {
            this.unlockReadLock();
        }
    }

    public MutableIntList collectInt(IntFunction intFunction)
    {
        this.acquireReadLock();
        try
        {
            return this.delegate.collectInt(intFunction);
        }
        finally
        {
            this.unlockReadLock();
        }
    }

    public MutableLongList collectLong(LongFunction longFunction)
    {
        this.acquireReadLock();
        try
        {
            return this.delegate.collectLong(longFunction);
        }
        finally
        {
            this.unlockReadLock();
        }
    }

    public MutableShortList collectShort(ShortFunction shortFunction)
    {
        this.acquireReadLock();
        try
        {
            return this.delegate.collectShort(shortFunction);
        }
        finally
        {
            this.unlockReadLock();
        }
    }

    public  MutableList flatCollect(
            Function> function)
    {
        this.acquireReadLock();
        try
        {
            return this.delegate.flatCollect(function);
        }
        finally
        {
            this.unlockReadLock();
        }
    }

    public  MutableList collectIf(
            Predicate predicate,
            Function function)
    {
        this.acquireReadLock();
        try
        {
            return this.delegate.collectIf(predicate, function);
        }
        finally
        {
            this.unlockReadLock();
        }
    }

    public  MutableList collectWith(
            Function2 function,
            P parameter)
    {
        this.acquireReadLock();
        try
        {
            return this.delegate.collectWith(function, parameter);
        }
        finally
        {
            this.unlockReadLock();
        }
    }

    public MutableList newEmpty()
    {
        return MultiReaderFastList.newList();
    }

    public MutableList reject(Predicate predicate)
    {
        this.acquireReadLock();
        try
        {
            return this.delegate.reject(predicate);
        }
        finally
        {
            this.unlockReadLock();
        }
    }

    public 

MutableList rejectWith( Predicate2 predicate, P parameter) { this.acquireReadLock(); try { return this.delegate.rejectWith(predicate, parameter); } finally { this.unlockReadLock(); } } public MutableList select(Predicate predicate) { this.acquireReadLock(); try { return this.delegate.select(predicate); } finally { this.unlockReadLock(); } } public

MutableList selectWith( Predicate2 predicate, P parameter) { this.acquireReadLock(); try { return this.delegate.selectWith(predicate, parameter); } finally { this.unlockReadLock(); } } public PartitionMutableList partition(Predicate predicate) { this.acquireReadLock(); try { return this.delegate.partition(predicate); } finally { this.unlockReadLock(); } } public

PartitionMutableList partitionWith(Predicate2 predicate, P parameter) { this.acquireReadLock(); try { return this.delegate.partitionWith(predicate, parameter); } finally { this.unlockReadLock(); } } public MutableList selectInstancesOf(Class clazz) { this.acquireReadLock(); try { return this.delegate.selectInstancesOf(clazz); } finally { this.unlockReadLock(); } } public MutableList distinct() { this.acquireReadLock(); try { return this.delegate.distinct(); } finally { this.unlockReadLock(); } } public MutableList sortThis() { this.acquireWriteLock(); try { this.delegate.sortThis(); return this; } finally { this.unlockWriteLock(); } } public MutableList sortThis(Comparator comparator) { this.acquireWriteLock(); try { this.delegate.sortThis(comparator); return this; } finally { this.unlockWriteLock(); } } public > MutableList sortThisBy( Function function) { this.acquireWriteLock(); try { this.delegate.sortThisBy(function); return this; } finally { this.unlockWriteLock(); } } public MutableList subList(int fromIndex, int toIndex) { this.acquireReadLock(); try { return new MultiReaderFastList(this.delegate.subList(fromIndex, toIndex), this.lock); } 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 T get(int index) { this.acquireReadLock(); try { return this.delegate.get(index); } finally { this.unlockReadLock(); } } public int indexOf(Object o) { this.acquireReadLock(); try { return this.delegate.indexOf(o); } finally { this.unlockReadLock(); } } public int lastIndexOf(Object o) { this.acquireReadLock(); try { return this.delegate.lastIndexOf(o); } finally { this.unlockReadLock(); } } public MutableList with(T element) { this.add(element); return this; } public MutableList without(T element) { this.remove(element); return this; } public MutableList withAll(Iterable elements) { this.addAllIterable(elements); return this; } public MutableList withoutAll(Iterable elements) { this.removeAllIterable(elements); return this; } /** * This method is not supported directly on a MultiReaderFastList. If you would like to use a ListIterator with * MultiReaderFastList, then you must do the following: *

*

     * multiReaderList.withReadLockAndDelegate(new Procedure>()
     * {
     *     public void value(MutableList people)
     *     {
     *         Iterator it = people.listIterator();
     *         ....
     *     }
     * });
     * 
*/ public ListIterator listIterator() { throw new UnsupportedOperationException( "ListIterator is not supported for MultiReaderFastList. " + "If you would like to use a ListIterator, you must either use withReadLockAndDelegate() or withWriteLockAndDelegate()."); } /** * This method is not supported directly on a MultiReaderFastList. If you would like to use a ListIterator with * MultiReaderFastList, then you must do the following: *

*

     * multiReaderList.withReadLockAndDelegate(new Procedure>()
     * {
     *     public void value(MutableList people)
     *     {
     *         Iterator it = people.listIterator(0);
     *         ....
     *     }
     * });
     * 
*/ public ListIterator listIterator(int index) { throw new UnsupportedOperationException( "ListIterator is not supported for MultiReaderFastList. " + "If you would like to use a ListIterator, you must either use withReadLockAndDelegate() or withWriteLockAndDelegate()."); } public T remove(int index) { this.acquireWriteLock(); try { return this.delegate.remove(index); } finally { this.unlockWriteLock(); } } public T set(int index, T element) { this.acquireWriteLock(); try { return this.delegate.set(index, element); } finally { this.unlockWriteLock(); } } public boolean addAll(int index, Collection collection) { this.acquireWriteLock(); try { return this.delegate.addAll(index, collection); } finally { this.unlockWriteLock(); } } public void add(int index, T element) { this.acquireWriteLock(); try { this.delegate.add(index, element); } finally { this.unlockWriteLock(); } } public void forEach(int startIndex, int endIndex, Procedure procedure) { this.acquireReadLock(); try { this.delegate.forEach(startIndex, endIndex, procedure); } finally { this.unlockReadLock(); } } public int binarySearch(T key, Comparator comparator) { this.acquireReadLock(); try { return Collections.binarySearch(this, key, comparator); } finally { this.unlockReadLock(); } } public int binarySearch(T key) { this.acquireReadLock(); try { return Collections.binarySearch((List>) this, key); } finally { this.unlockReadLock(); } } public void reverseForEach(final Procedure procedure) { this.withReadLockRun(new Runnable() { public void run() { MultiReaderFastList.this.getDelegate().reverseForEach(procedure); } }); } public void forEachWithIndex(final int fromIndex, final int toIndex, final ObjectIntProcedure objectIntProcedure) { this.withReadLockRun(new Runnable() { public void run() { MultiReaderFastList.this.getDelegate().forEachWithIndex(fromIndex, toIndex, objectIntProcedure); } }); } public void writeExternal(ObjectOutput out) throws IOException { out.writeObject(this.delegate); } public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException { this.delegate = (MutableList) in.readObject(); this.lock = new ReentrantReadWriteLock(); } // Exposed for testing static final class UntouchableMutableList extends UntouchableMutableCollection implements MutableList { private final MutableList> requestedIterators = mList(); private final MutableList> requestedSubLists = mList(); private UntouchableMutableList(MutableList delegate) { this.delegate = delegate; } public MutableList with(T element) { this.add(element); return this; } public MutableList without(T element) { this.remove(element); return this; } public MutableList withAll(Iterable elements) { this.addAllIterable(elements); return this; } public MutableList withoutAll(Iterable elements) { this.removeAllIterable(elements); return this; } public MutableList asSynchronized() { throw new UnsupportedOperationException("Cannot call asSynchronized() on " + this.getClass().getSimpleName()); } public MutableList asUnmodifiable() { throw new UnsupportedOperationException("Cannot call asUnmodifiable() on " + this.getClass().getSimpleName()); } public LazyIterable asLazy() { return LazyIterate.adapt(this); } public ImmutableList toImmutable() { return Lists.immutable.ofAll(this.getDelegate()); } @Override public MutableList clone() { return this.getDelegate().clone(); } public MutableList collect(Function function) { return this.getDelegate().collect(function); } public MutableBooleanList collectBoolean(BooleanFunction booleanFunction) { return this.getDelegate().collectBoolean(booleanFunction); } public R collectBoolean(BooleanFunction booleanFunction, R target) { return this.getDelegate().collectBoolean(booleanFunction, target); } public MutableByteList collectByte(ByteFunction byteFunction) { return this.getDelegate().collectByte(byteFunction); } public R collectByte(ByteFunction byteFunction, R target) { return this.getDelegate().collectByte(byteFunction, target); } public MutableCharList collectChar(CharFunction charFunction) { return this.getDelegate().collectChar(charFunction); } public R collectChar(CharFunction charFunction, R target) { return this.getDelegate().collectChar(charFunction, target); } public MutableDoubleList collectDouble(DoubleFunction doubleFunction) { return this.getDelegate().collectDouble(doubleFunction); } public R collectDouble(DoubleFunction doubleFunction, R target) { return this.getDelegate().collectDouble(doubleFunction, target); } public MutableFloatList collectFloat(FloatFunction floatFunction) { return this.getDelegate().collectFloat(floatFunction); } public R collectFloat(FloatFunction floatFunction, R target) { return this.getDelegate().collectFloat(floatFunction, target); } public MutableIntList collectInt(IntFunction intFunction) { return this.getDelegate().collectInt(intFunction); } public R collectInt(IntFunction intFunction, R target) { return this.getDelegate().collectInt(intFunction, target); } public MutableLongList collectLong(LongFunction longFunction) { return this.getDelegate().collectLong(longFunction); } public R collectLong(LongFunction longFunction, R target) { return this.getDelegate().collectLong(longFunction, target); } public MutableShortList collectShort(ShortFunction shortFunction) { return this.getDelegate().collectShort(shortFunction); } public R collectShort(ShortFunction shortFunction, R target) { return this.getDelegate().collectShort(shortFunction, target); } public MutableList flatCollect(Function> function) { return this.getDelegate().flatCollect(function); } public MutableList collectIf( Predicate predicate, Function function) { return this.getDelegate().collectIf(predicate, function); } public MutableList collectWith( Function2 function, P parameter) { return this.getDelegate().collectWith(function, parameter); } public MutableListMultimap groupBy(Function function) { return this.getDelegate().groupBy(function); } public MutableListMultimap groupByEach(Function> function) { return this.getDelegate().groupByEach(function); } public MutableMap groupByUniqueKey(Function function) { return this.getDelegate().groupByUniqueKey(function); } public void forEach(int fromIndex, int toIndex, Procedure procedure) { this.getDelegate().forEach(fromIndex, toIndex, procedure); } public void reverseForEach(Procedure procedure) { this.getDelegate().reverseForEach(procedure); } public void forEachWithIndex(int fromIndex, int toIndex, ObjectIntProcedure objectIntProcedure) { this.getDelegate().forEachWithIndex(fromIndex, toIndex, objectIntProcedure); } public MutableList newEmpty() { return this.getDelegate().newEmpty(); } public MutableList reject(Predicate predicate) { return this.getDelegate().reject(predicate); } public MutableList distinct() { return this.getDelegate().distinct(); } public

MutableList rejectWith( Predicate2 predicate, P parameter) { return this.getDelegate().rejectWith(predicate, parameter); } public MutableList select(Predicate predicate) { return this.getDelegate().select(predicate); } public

MutableList selectWith( Predicate2 predicate, P parameter) { return this.getDelegate().selectWith(predicate, parameter); } public PartitionMutableList partition(Predicate predicate) { return this.getDelegate().partition(predicate); } public

PartitionMutableList partitionWith(Predicate2 predicate, P parameter) { return this.getDelegate().partitionWith(predicate, parameter); } public MutableList selectInstancesOf(Class clazz) { return this.getDelegate().selectInstancesOf(clazz); } public MutableList sortThis() { this.getDelegate().sortThis(); return this; } public MutableList sortThis(Comparator comparator) { this.getDelegate().sortThis(comparator); return this; } public MutableList toReversed() { return this.getDelegate().toReversed(); } public MutableList reverseThis() { this.getDelegate().reverseThis(); return this; } public MutableStack toStack() { return ArrayStack.newStack(this.delegate); } public > MutableList sortThisBy(Function function) { this.getDelegate().sortThisBy(function); return this; } public MutableList takeWhile(Predicate predicate) { return this.getDelegate().takeWhile(predicate); } public MutableList dropWhile(Predicate predicate) { return this.getDelegate().dropWhile(predicate); } public PartitionMutableList partitionWhile(Predicate predicate) { return this.getDelegate().partitionWhile(predicate); } public MutableList subList(int fromIndex, int toIndex) { UntouchableMutableList subList = new UntouchableMutableList( this.getDelegate().subList(fromIndex, toIndex)); this.requestedSubLists.add(subList); return subList; } public Iterator iterator() { UntouchableListIterator iterator = new UntouchableListIterator(this.delegate.iterator()); this.requestedIterators.add(iterator); return iterator; } public void add(int index, T element) { this.getDelegate().add(index, element); } public boolean addAll(int index, Collection collection) { return this.getDelegate().addAll(index, collection); } public T get(int index) { return this.getDelegate().get(index); } public int indexOf(Object o) { return this.getDelegate().indexOf(o); } public int lastIndexOf(Object o) { return this.getDelegate().lastIndexOf(o); } public ListIterator listIterator() { UntouchableListIterator iterator = new UntouchableListIterator(this.getDelegate().listIterator()); this.requestedIterators.add(iterator); return iterator; } public ListIterator listIterator(int index) { UntouchableListIterator iterator = new UntouchableListIterator(this.getDelegate().listIterator(index)); this.requestedIterators.add(iterator); return iterator; } public T remove(int index) { return this.getDelegate().remove(index); } public T set(int index, T element) { return this.getDelegate().set(index, element); } public MutableList> zip(Iterable that) { return this.getDelegate().zip(that); } public MutableList> zipWithIndex() { return this.getDelegate().zipWithIndex(); } public LazyIterable asReversed() { return ReverseIterable.adapt(this); } public int binarySearch(T key, Comparator comparator) { return Collections.binarySearch(this, key, comparator); } public int binarySearch(T key) { return Collections.binarySearch((List>) this, key); } public void becomeUseless() { this.delegate = null; this.requestedSubLists.forEach(new Procedure>() { public void value(UntouchableMutableList each) { each.becomeUseless(); } }); this.requestedIterators.forEach(new Procedure>() { public void value(UntouchableListIterator each) { each.becomeUseless(); } }); } private MutableList getDelegate() { return (MutableList) this.delegate; } } private static final class UntouchableListIterator implements ListIterator { private Iterator delegate; private UntouchableListIterator(Iterator newDelegate) { this.delegate = newDelegate; } public void add(T o) { ((ListIterator) this.delegate).add(o); } public boolean hasNext() { return this.delegate.hasNext(); } public boolean hasPrevious() { return ((ListIterator) this.delegate).hasPrevious(); } public T next() { return this.delegate.next(); } public int nextIndex() { return ((ListIterator) this.delegate).nextIndex(); } public T previous() { return ((ListIterator) this.delegate).previous(); } public int previousIndex() { return ((ListIterator) this.delegate).previousIndex(); } public void remove() { this.delegate.remove(); } public void set(T o) { ((ListIterator) this.delegate).set(o); } public void becomeUseless() { this.delegate = null; } } public MutableListMultimap groupBy(Function function) { this.acquireReadLock(); try { return this.delegate.groupBy(function); } finally { this.unlockReadLock(); } } public MutableListMultimap groupByEach(Function> function) { this.acquireReadLock(); try { return this.delegate.groupByEach(function); } finally { this.unlockReadLock(); } } public MutableMap groupByUniqueKey(Function function) { this.acquireReadLock(); try { return this.delegate.groupByUniqueKey(function); } finally { this.unlockReadLock(); } } public MutableList> zip(Iterable that) { this.acquireReadLock(); try { return this.delegate.zip(that); } finally { this.unlockReadLock(); } } public MutableList> zipWithIndex() { this.acquireReadLock(); try { return this.delegate.zipWithIndex(); } finally { this.unlockReadLock(); } } public MutableList toReversed() { this.acquireReadLock(); try { return this.delegate.toReversed(); } finally { this.unlockReadLock(); } } public MutableList reverseThis() { this.acquireWriteLock(); try { this.delegate.reverseThis(); return this; } finally { this.unlockWriteLock(); } } public MutableStack toStack() { this.acquireReadLock(); try { return this.delegate.toStack(); } finally { this.unlockReadLock(); } } public RichIterable> chunk(int size) { this.acquireReadLock(); try { return this.delegate.chunk(size); } finally { this.unlockReadLock(); } } public MutableList takeWhile(Predicate predicate) { this.acquireReadLock(); try { return this.delegate.takeWhile(predicate); } finally { this.unlockReadLock(); } } public MutableList dropWhile(Predicate predicate) { this.acquireReadLock(); try { return this.delegate.dropWhile(predicate); } finally { this.unlockReadLock(); } } public PartitionMutableList partitionWhile(Predicate predicate) { this.acquireReadLock(); try { return this.delegate.partitionWhile(predicate); } finally { this.unlockReadLock(); } } public LazyIterable asReversed() { this.acquireReadLock(); try { return ReverseIterable.adapt(this); } finally { this.unlockReadLock(); } } }