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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.bag.immutable;

import java.io.IOException;
import java.io.Serializable;
import java.util.Collection;
import java.util.Comparator;
import java.util.Iterator;
import java.util.NoSuchElementException;

import com.gs.collections.api.LazyIterable;
import com.gs.collections.api.RichIterable;
import com.gs.collections.api.bag.Bag;
import com.gs.collections.api.bag.ImmutableBag;
import com.gs.collections.api.bag.MutableBag;
import com.gs.collections.api.bag.primitive.ImmutableBooleanBag;
import com.gs.collections.api.bag.primitive.ImmutableByteBag;
import com.gs.collections.api.bag.primitive.ImmutableCharBag;
import com.gs.collections.api.bag.primitive.ImmutableDoubleBag;
import com.gs.collections.api.bag.primitive.ImmutableFloatBag;
import com.gs.collections.api.bag.primitive.ImmutableIntBag;
import com.gs.collections.api.bag.primitive.ImmutableLongBag;
import com.gs.collections.api.bag.primitive.ImmutableShortBag;
import com.gs.collections.api.block.function.Function;
import com.gs.collections.api.block.function.Function0;
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.DoubleObjectToDoubleFunction;
import com.gs.collections.api.block.function.primitive.FloatFunction;
import com.gs.collections.api.block.function.primitive.FloatObjectToFloatFunction;
import com.gs.collections.api.block.function.primitive.IntFunction;
import com.gs.collections.api.block.function.primitive.IntObjectToIntFunction;
import com.gs.collections.api.block.function.primitive.LongFunction;
import com.gs.collections.api.block.function.primitive.LongObjectToLongFunction;
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.Procedure2;
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.ImmutableMap;
import com.gs.collections.api.map.MutableMap;
import com.gs.collections.api.map.sorted.MutableSortedMap;
import com.gs.collections.api.multimap.MutableMultimap;
import com.gs.collections.api.multimap.bag.ImmutableBagMultimap;
import com.gs.collections.api.partition.bag.PartitionImmutableBag;
import com.gs.collections.api.set.ImmutableSet;
import com.gs.collections.api.set.MutableSet;
import com.gs.collections.api.set.sorted.MutableSortedSet;
import com.gs.collections.api.stack.MutableStack;
import com.gs.collections.api.tuple.Pair;
import com.gs.collections.impl.EmptyIterator;
import com.gs.collections.impl.bag.mutable.HashBag;
import com.gs.collections.impl.block.factory.Comparators;
import com.gs.collections.impl.factory.Bags;
import com.gs.collections.impl.factory.Lists;
import com.gs.collections.impl.factory.Maps;
import com.gs.collections.impl.factory.Sets;
import com.gs.collections.impl.factory.Stacks;
import com.gs.collections.impl.factory.primitive.BooleanBags;
import com.gs.collections.impl.factory.primitive.ByteBags;
import com.gs.collections.impl.factory.primitive.CharBags;
import com.gs.collections.impl.factory.primitive.DoubleBags;
import com.gs.collections.impl.factory.primitive.FloatBags;
import com.gs.collections.impl.factory.primitive.IntBags;
import com.gs.collections.impl.factory.primitive.LongBags;
import com.gs.collections.impl.factory.primitive.ShortBags;
import com.gs.collections.impl.map.mutable.UnifiedMap;
import com.gs.collections.impl.map.sorted.mutable.TreeSortedMap;
import com.gs.collections.impl.multimap.bag.HashBagMultimap;
import com.gs.collections.impl.partition.bag.PartitionHashBag;
import com.gs.collections.impl.set.mutable.UnifiedSet;
import com.gs.collections.impl.set.sorted.mutable.TreeSortedSet;
import com.gs.collections.impl.utility.ArrayIterate;
import com.gs.collections.impl.utility.Iterate;
import com.gs.collections.impl.utility.LazyIterate;
import net.jcip.annotations.Immutable;

/**
 * This is a zero element {@link ImmutableBag} which is created by calling the Bags.immutable.of().
 *
 * @since 1.0
 */
@Immutable
final class ImmutableEmptyBag
        implements ImmutableBag, Serializable
{
    static final ImmutableBag INSTANCE = new ImmutableEmptyBag();

    private static final long serialVersionUID = 1L;

    private static final LazyIterable LAZY_ITERABLE = LazyIterate.adapt(INSTANCE);
    private static final Object[] TO_ARRAY = new Object[0];
    private static final PartitionImmutableBag IMMUTABLE_EMPTY_PARTITION = new PartitionHashBag().toImmutable();

    @Override
    public boolean equals(Object obj)
    {
        if (obj == this)
        {
            return true;
        }
        return obj instanceof Bag && ((Bag) obj).isEmpty();
    }

    public int sizeDistinct()
    {
        return 0;
    }

    public String toStringOfItemToCount()
    {
        return "";
    }

    public int occurrencesOf(Object item)
    {
        return 0;
    }

    public void forEachWithOccurrences(ObjectIntProcedure objectIntProcedure)
    {
    }

    public MutableMap toMapOfItemToCount()
    {
        return Maps.mutable.of();
    }

    public ImmutableBag toImmutable()
    {
        return this;
    }

    @Override
    public int hashCode()
    {
        return 0;
    }

    public int size()
    {
        return 0;
    }

    public boolean isEmpty()
    {
        return true;
    }

    public boolean notEmpty()
    {
        return false;
    }

    public boolean contains(Object object)
    {
        return false;
    }

    public boolean containsAll(Collection source)
    {
        return this.containsAllIterable(source);
    }

    public boolean containsAllIterable(Iterable source)
    {
        return Iterate.isEmpty(source);
    }

    public boolean containsAllArguments(Object... elements)
    {
        return ArrayIterate.isEmpty(elements);
    }

    public void forEach(Procedure procedure)
    {
    }

    public void forEachWithIndex(ObjectIntProcedure objectIntProcedure)
    {
    }

    public 
     void forEachWith(Procedure2 procedure, P parameter)
    {
    }

    public T getFirst()
    {
        return null;
    }

    public T getLast()
    {
        return null;
    }

    public Iterator iterator()
    {
        return EmptyIterator.getInstance();
    }

    public ImmutableBag newWith(T element)
    {
        return Bags.immutable.of(element);
    }

    public ImmutableBag newWithout(T element)
    {
        return this;
    }

    public ImmutableBag newWithAll(Iterable elements)
    {
        return HashBag.newBag(elements).toImmutable();
    }

    public ImmutableBag newWithoutAll(Iterable elements)
    {
        return this;
    }

    public ImmutableBag selectByOccurrences(IntPredicate predicate)
    {
        return this;
    }

    public ImmutableBag select(Predicate predicate)
    {
        return this;
    }

    public > R select(Predicate predicate, R target)
    {
        return target;
    }

    public 
     ImmutableBag selectWith(Predicate2 predicate, P parameter)
    {
        return this;
    }

    public > R selectWith(
            Predicate2 predicate, P parameter, R targetCollection)
    {
        return targetCollection;
    }

    public ImmutableBag reject(Predicate predicate)
    {
        return this;
    }

    public > R reject(Predicate predicate, R target)
    {
        return target;
    }

    public 
     ImmutableBag rejectWith(Predicate2 predicate, P parameter)
    {
        return this;
    }

    public > R rejectWith(
            Predicate2 predicate, P parameter, R targetCollection)
    {
        return targetCollection;
    }

    public PartitionImmutableBag partition(Predicate predicate)
    {
        return (PartitionImmutableBag) IMMUTABLE_EMPTY_PARTITION;
    }

    public 
     PartitionImmutableBag partitionWith(Predicate2 predicate, P parameter)
    {
        return (PartitionImmutableBag) IMMUTABLE_EMPTY_PARTITION;
    }

    public  ImmutableBag selectInstancesOf(Class clazz)
    {
        return (ImmutableBag) INSTANCE;
    }

    public  ImmutableBag collect(Function function)
    {
        return (ImmutableBag) INSTANCE;
    }

    public ImmutableBooleanBag collectBoolean(BooleanFunction booleanFunction)
    {
        return BooleanBags.immutable.of();
    }

    public  R collectBoolean(BooleanFunction booleanFunction, R target)
    {
        return target;
    }

    public ImmutableByteBag collectByte(ByteFunction byteFunction)
    {
        return ByteBags.immutable.of();
    }

    public  R collectByte(ByteFunction byteFunction, R target)
    {
        return target;
    }

    public ImmutableCharBag collectChar(CharFunction charFunction)
    {
        return CharBags.immutable.of();
    }

    public  R collectChar(CharFunction charFunction, R target)
    {
        return target;
    }

    public ImmutableDoubleBag collectDouble(DoubleFunction doubleFunction)
    {
        return DoubleBags.immutable.of();
    }

    public  R collectDouble(DoubleFunction doubleFunction, R target)
    {
        return target;
    }

    public ImmutableFloatBag collectFloat(FloatFunction floatFunction)
    {
        return FloatBags.immutable.of();
    }

    public  R collectFloat(FloatFunction floatFunction, R target)
    {
        return target;
    }

    public ImmutableIntBag collectInt(IntFunction intFunction)
    {
        return IntBags.immutable.of();
    }

    public  R collectInt(IntFunction intFunction, R target)
    {
        return target;
    }

    public ImmutableLongBag collectLong(LongFunction longFunction)
    {
        return LongBags.immutable.of();
    }

    public  R collectLong(LongFunction longFunction, R target)
    {
        return target;
    }

    public ImmutableShortBag collectShort(ShortFunction shortFunction)
    {
        return ShortBags.immutable.of();
    }

    public  R collectShort(ShortFunction shortFunction, R target)
    {
        return target;
    }

    public > R collect(Function function, R target)
    {
        return target;
    }

    public  ImmutableBag collectWith(Function2 function, P parameter)
    {
        return (ImmutableBag) INSTANCE;
    }

    public > R collectWith(
            Function2 function, P parameter, R targetCollection)
    {
        return targetCollection;
    }

    public  ImmutableBag collectIf(
            Predicate predicate,
            Function function)
    {
        return (ImmutableBag) INSTANCE;
    }

    public > R collectIf(
            Predicate predicate,
            Function function,
            R target)
    {
        return target;
    }

    public  ImmutableBag flatCollect(Function> function)
    {
        return (ImmutableBag) INSTANCE;
    }

    public > R flatCollect(
            Function> function,
            R target)
    {
        return target;
    }

    public  ImmutableBagMultimap groupBy(Function function)
    {
        // TODO: Create a Singleton ImmutableEmptyBagMultimap for efficiency
        return HashBagMultimap.newMultimap().toImmutable();
    }

    public  ImmutableBagMultimap groupByEach(Function> function)
    {
        // TODO: Create a Singleton ImmutableEmptyBagMultimap for efficiency
        return HashBagMultimap.newMultimap().toImmutable();
    }

    public > R groupBy(
            Function function, R target)
    {
        return target;
    }

    public > R groupByEach(
            Function> function, R target)
    {
        return target;
    }

    public  ImmutableMap groupByUniqueKey(Function function)
    {
        throw new UnsupportedOperationException(this.getClass().getSimpleName() + ".groupByUniqueKey() not implemented yet");
    }

    public T detect(Predicate predicate)
    {
        return null;
    }

    public 
     T detectWith(Predicate2 predicate, P parameter)
    {
        return null;
    }

    public T detectIfNone(Predicate predicate, Function0 function)
    {
        return function.value();
    }

    public 
     T detectWithIfNone(Predicate2 predicate, P parameter, Function0 function)
    {
        return function.value();
    }

    public int count(Predicate predicate)
    {
        return 0;
    }

    public 
     int countWith(Predicate2 predicate, P parameter)
    {
        return 0;
    }

    public boolean anySatisfy(Predicate predicate)
    {
        return false;
    }

    public boolean allSatisfy(Predicate predicate)
    {
        return true;
    }

    public boolean noneSatisfy(Predicate predicate)
    {
        return true;
    }

    public 
     boolean anySatisfyWith(Predicate2 predicate, P parameter)
    {
        return false;
    }

    public 
     boolean allSatisfyWith(Predicate2 predicate, P parameter)
    {
        return true;
    }

    public 
     boolean noneSatisfyWith(Predicate2 predicate, P parameter)
    {
        return true;
    }

    public  IV injectInto(IV injectedValue, Function2 function)
    {
        return injectedValue;
    }

    public int injectInto(int injectedValue, IntObjectToIntFunction function)
    {
        return injectedValue;
    }

    public long injectInto(long injectedValue, LongObjectToLongFunction function)
    {
        return injectedValue;
    }

    public double injectInto(double injectedValue, DoubleObjectToDoubleFunction function)
    {
        return injectedValue;
    }

    public float injectInto(float injectedValue, FloatObjectToFloatFunction function)
    {
        return injectedValue;
    }

    public long sumOfInt(IntFunction function)
    {
        return 0;
    }

    public double sumOfFloat(FloatFunction function)
    {
        return 0.0F;
    }

    public long sumOfLong(LongFunction function)
    {
        return 0L;
    }

    public double sumOfDouble(DoubleFunction function)
    {
        return 0.0d;
    }

    public MutableList toList()
    {
        return Lists.mutable.of();
    }

    public MutableList toSortedList()
    {
        return Lists.mutable.of();
    }

    public MutableList toSortedList(Comparator comparator)
    {
        return Lists.mutable.of();
    }

    public > MutableList toSortedListBy(Function function)
    {
        return Lists.mutable.of();
    }

    public MutableSortedSet toSortedSet()
    {
        return TreeSortedSet.newSet();
    }

    public MutableSortedSet toSortedSet(Comparator comparator)
    {
        return TreeSortedSet.newSet(comparator);
    }

    public > MutableSortedSet toSortedSetBy(Function function)
    {
        return TreeSortedSet.newSet(Comparators.byFunction(function));
    }

    public MutableSet toSet()
    {
        return UnifiedSet.newSet();
    }

    public MutableBag toBag()
    {
        return Bags.mutable.of();
    }

    public MutableStack toStack()
    {
        return Stacks.mutable.of();
    }

    public  MutableMap toMap(
            Function keyFunction,
            Function valueFunction)
    {
        return UnifiedMap.newMap();
    }

    public  MutableSortedMap toSortedMap(
            Function keyFunction,
            Function valueFunction)
    {
        return TreeSortedMap.newMap();
    }

    public  MutableSortedMap toSortedMap(Comparator comparator,
            Function keyFunction,
            Function valueFunction)
    {
        return TreeSortedMap.newMap(comparator);
    }

    public LazyIterable asLazy()
    {
        return (LazyIterable) LAZY_ITERABLE;
    }

    public Object[] toArray()
    {
        return TO_ARRAY;
    }

    public  T[] toArray(T[] a)
    {
        if (a.length > 0)
        {
            a[0] = null;
        }
        return a;
    }

    public T min(Comparator comparator)
    {
        throw new NoSuchElementException();
    }

    public T max(Comparator comparator)
    {
        throw new NoSuchElementException();
    }

    public T min()
    {
        throw new NoSuchElementException();
    }

    public T max()
    {
        throw new NoSuchElementException();
    }

    public > T minBy(Function function)
    {
        throw new NoSuchElementException();
    }

    public > T maxBy(Function function)
    {
        throw new NoSuchElementException();
    }

    @Override
    public String toString()
    {
        return "[]";
    }

    public String makeString()
    {
        return "";
    }

    public String makeString(String separator)
    {
        return "";
    }

    public String makeString(String start, String separator, String end)
    {
        return start + end;
    }

    public void appendString(Appendable appendable)
    {
    }

    public void appendString(Appendable appendable, String separator)
    {
    }

    public void appendString(Appendable appendable, String start, String separator, String end)
    {
        try
        {
            appendable.append(start);
            appendable.append(end);
        }
        catch (IOException e)
        {
            throw new RuntimeException(e);
        }
    }

    public  ImmutableBag> zip(Iterable that)
    {
        return Bags.immutable.of();
    }

    public >> R zip(Iterable that, R target)
    {
        return target;
    }

    public ImmutableSet> zipWithIndex()
    {
        return Sets.immutable.of();
    }

    public >> R zipWithIndex(R target)
    {
        return target;
    }

    public RichIterable> chunk(int size)
    {
        if (size <= 0)
        {
            throw new IllegalArgumentException("Size for groups must be positive but was: " + size);
        }
        return Bags.immutable.of();
    }

    private Object writeReplace()
    {
        return new ImmutableBagSerializationProxy(this);
    }

    public  ImmutableMap aggregateInPlaceBy(
            Function groupBy,
            Function0 zeroValueFactory,
            Procedure2 mutatingAggregator)
    {
        return Maps.immutable.of();
    }

    public  ImmutableMap aggregateBy(
            Function groupBy,
            Function0 zeroValueFactory,
            Function2 nonMutatingAggregator)
    {
        return Maps.immutable.of();
    }
}
    
    
    
    

    




    
    
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