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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 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.set.mutable;

import java.io.Serializable;
import java.util.Collection;
import java.util.Collections;
import java.util.Set;
import java.util.concurrent.ExecutorService;

import com.gs.collections.api.LazyIterable;
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.multimap.set.MutableSetMultimap;
import com.gs.collections.api.ordered.OrderedIterable;
import com.gs.collections.api.partition.set.PartitionMutableSet;
import com.gs.collections.api.set.ImmutableSet;
import com.gs.collections.api.set.MutableSet;
import com.gs.collections.api.set.ParallelUnsortedSetIterable;
import com.gs.collections.api.set.SetIterable;
import com.gs.collections.api.set.UnsortedSetIterable;
import com.gs.collections.api.set.primitive.MutableBooleanSet;
import com.gs.collections.api.set.primitive.MutableByteSet;
import com.gs.collections.api.set.primitive.MutableCharSet;
import com.gs.collections.api.set.primitive.MutableDoubleSet;
import com.gs.collections.api.set.primitive.MutableFloatSet;
import com.gs.collections.api.set.primitive.MutableIntSet;
import com.gs.collections.api.set.primitive.MutableLongSet;
import com.gs.collections.api.set.primitive.MutableShortSet;
import com.gs.collections.api.tuple.Pair;
import com.gs.collections.impl.collection.mutable.AbstractSynchronizedMutableCollection;
import com.gs.collections.impl.collection.mutable.SynchronizedCollectionSerializationProxy;
import com.gs.collections.impl.factory.Sets;
import com.gs.collections.impl.lazy.parallel.set.SynchronizedParallelUnsortedSetIterable;
import net.jcip.annotations.GuardedBy;
import net.jcip.annotations.ThreadSafe;

/**
 * A synchronized view of a {@link MutableSet}. It is imperative that the user manually synchronize on the collection when iterating over it using the
 * standard JDK iterator or JDK 5 for loop, as per {@link Collections#synchronizedCollection(Collection)}.
 *
 * @see MutableSet#asSynchronized()
 */
@ThreadSafe
public class SynchronizedMutableSet
        extends AbstractSynchronizedMutableCollection
        implements MutableSet, Serializable
{
    private static final long serialVersionUID = 2L;

    SynchronizedMutableSet(MutableSet set)
    {
        super(set);
    }

    SynchronizedMutableSet(MutableSet set, Object newLock)
    {
        super(set, newLock);
    }

    /**
     * This method will take a MutableSet and wrap it directly in a SynchronizedMutableSet.  It will
     * take any other non-GS-collection and first adapt it will a SetAdapter, and then return a
     * SynchronizedMutableSet that wraps the adapter.
     */
    public static > SynchronizedMutableSet of(S set)
    {
        return new SynchronizedMutableSet(SetAdapter.adapt(set));
    }

    /**
     * This method will take a MutableSet and wrap it directly in a SynchronizedMutableSet.  It will
     * take any other non-GS-collection and first adapt it will a SetAdapter, and then return a
     * SynchronizedMutableSet that wraps the adapter.  Additionally, a developer specifies which lock to use
     * with the collection.
     */
    public static > SynchronizedMutableSet of(S set, Object lock)
    {
        return new SynchronizedMutableSet(SetAdapter.adapt(set), lock);
    }

    @GuardedBy("getLock()")
    private MutableSet getMutableSet()
    {
        return (MutableSet) this.getDelegate();
    }

    public MutableSet with(T element)
    {
        this.add(element);
        return this;
    }

    public MutableSet without(T element)
    {
        this.remove(element);
        return this;
    }

    public MutableSet withAll(Iterable elements)
    {
        this.addAllIterable(elements);
        return this;
    }

    public MutableSet withoutAll(Iterable elements)
    {
        this.removeAllIterable(elements);
        return this;
    }

    public MutableSet newEmpty()
    {
        synchronized (this.getLock())
        {
            return this.getMutableSet().newEmpty().asSynchronized();
        }
    }

    @Override
    public MutableSet clone()
    {
        synchronized (this.getLock())
        {
            return SynchronizedMutableSet.of(this.getMutableSet().clone());
        }
    }

    protected Object writeReplace()
    {
        return new SynchronizedCollectionSerializationProxy(this.getMutableSet());
    }

    public MutableSet tap(Procedure procedure)
    {
        synchronized (this.getLock())
        {
            this.forEach(procedure);
            return this;
        }
    }

    public MutableSet select(Predicate predicate)
    {
        synchronized (this.getLock())
        {
            return this.getMutableSet().select(predicate);
        }
    }

    public 

MutableSet selectWith(Predicate2 predicate, P parameter) { synchronized (this.getLock()) { return this.getMutableSet().selectWith(predicate, parameter); } } public MutableSet reject(Predicate predicate) { synchronized (this.getLock()) { return this.getMutableSet().reject(predicate); } } public

MutableSet rejectWith(Predicate2 predicate, P parameter) { synchronized (this.getLock()) { return this.getMutableSet().rejectWith(predicate, parameter); } } public PartitionMutableSet partition(Predicate predicate) { synchronized (this.getLock()) { return this.getMutableSet().partition(predicate); } } public

PartitionMutableSet partitionWith(Predicate2 predicate, P parameter) { synchronized (this.getLock()) { return this.getMutableSet().partitionWith(predicate, parameter); } } public MutableBooleanSet collectBoolean(BooleanFunction booleanFunction) { synchronized (this.getLock()) { return this.getMutableSet().collectBoolean(booleanFunction); } } public MutableByteSet collectByte(ByteFunction byteFunction) { synchronized (this.getLock()) { return this.getMutableSet().collectByte(byteFunction); } } public MutableCharSet collectChar(CharFunction charFunction) { synchronized (this.getLock()) { return this.getMutableSet().collectChar(charFunction); } } public MutableDoubleSet collectDouble(DoubleFunction doubleFunction) { synchronized (this.getLock()) { return this.getMutableSet().collectDouble(doubleFunction); } } public MutableFloatSet collectFloat(FloatFunction floatFunction) { synchronized (this.getLock()) { return this.getMutableSet().collectFloat(floatFunction); } } public MutableIntSet collectInt(IntFunction intFunction) { synchronized (this.getLock()) { return this.getMutableSet().collectInt(intFunction); } } public MutableLongSet collectLong(LongFunction longFunction) { synchronized (this.getLock()) { return this.getMutableSet().collectLong(longFunction); } } public MutableShortSet collectShort(ShortFunction shortFunction) { synchronized (this.getLock()) { return this.getMutableSet().collectShort(shortFunction); } } public MutableSet selectInstancesOf(Class clazz) { synchronized (this.getLock()) { return this.getMutableSet().selectInstancesOf(clazz); } } public MutableSet collect(Function function) { synchronized (this.getLock()) { return this.getMutableSet().collect(function); } } /** * @deprecated in 6.0. Use {@link OrderedIterable#zipWithIndex()} instead. */ @Deprecated public MutableSet> zipWithIndex() { synchronized (this.getLock()) { return this.getMutableSet().zipWithIndex(); } } public MutableSet collectWith(Function2 function, P parameter) { synchronized (this.getLock()) { return this.getMutableSet().collectWith(function, parameter); } } public MutableSet collectIf( Predicate predicate, Function function) { synchronized (this.getLock()) { return this.getMutableSet().collectIf(predicate, function); } } public MutableSet flatCollect(Function> function) { synchronized (this.getLock()) { return this.getMutableSet().flatCollect(function); } } public MutableSetMultimap groupBy(Function function) { synchronized (this.getLock()) { return this.getMutableSet().groupBy(function); } } public MutableSetMultimap groupByEach(Function> function) { synchronized (this.getLock()) { return this.getMutableSet().groupByEach(function); } } /** * @deprecated in 6.0. Use {@link OrderedIterable#zip(Iterable)} instead. */ @Deprecated public MutableSet> zip(Iterable that) { synchronized (this.getLock()) { return this.getMutableSet().zip(that); } } public > R unionInto(SetIterable set, R targetSet) { synchronized (this.getLock()) { return this.getMutableSet().unionInto(set, targetSet); } } public > R intersectInto(SetIterable set, R targetSet) { synchronized (this.getLock()) { return this.getMutableSet().intersectInto(set, targetSet); } } public > R differenceInto(SetIterable subtrahendSet, R targetSet) { synchronized (this.getLock()) { return this.getMutableSet().differenceInto(subtrahendSet, targetSet); } } public > R symmetricDifferenceInto(SetIterable set, R targetSet) { synchronized (this.getLock()) { return this.getMutableSet().symmetricDifferenceInto(set, targetSet); } } public boolean isSubsetOf(SetIterable candidateSuperset) { synchronized (this.getLock()) { return this.getMutableSet().isSubsetOf(candidateSuperset); } } public boolean isProperSubsetOf(SetIterable candidateSuperset) { synchronized (this.getLock()) { return this.getMutableSet().isProperSubsetOf(candidateSuperset); } } public LazyIterable> cartesianProduct(SetIterable set) { synchronized (this.getLock()) { return this.getMutableSet().cartesianProduct(set); } } public MutableSet union(SetIterable set) { synchronized (this.getLock()) { return this.getMutableSet().union(set); } } public MutableSet intersect(SetIterable set) { synchronized (this.getLock()) { return this.getMutableSet().intersect(set); } } public MutableSet difference(SetIterable subtrahendSet) { synchronized (this.getLock()) { return this.getMutableSet().difference(subtrahendSet); } } public MutableSet symmetricDifference(SetIterable setB) { synchronized (this.getLock()) { return this.getMutableSet().symmetricDifference(setB); } } public MutableSet> powerSet() { synchronized (this.getLock()) { return this.getMutableSet().powerSet(); } } public ParallelUnsortedSetIterable asParallel(ExecutorService executorService, int batchSize) { return new SynchronizedParallelUnsortedSetIterable(this.getMutableSet().asParallel(executorService, batchSize), this.getLock()); } public MutableSet asUnmodifiable() { synchronized (this.getLock()) { return UnmodifiableMutableSet.of(this); } } public MutableSet asSynchronized() { return this; } public ImmutableSet toImmutable() { synchronized (this.getLock()) { return Sets.immutable.withAll(this.getMutableSet()); } } }