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    • com.gs.collections.impl.set.immutable.ImmutableEmptySet Maven / Gradle / Ivy

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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 2013 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.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 java.util.Set;

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.DoubleObjectToDoubleFunction;
import com.gs.collections.api.block.function.primitive.IntObjectToIntFunction;
import com.gs.collections.api.block.function.primitive.LongObjectToLongFunction;
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.Procedure2;
import com.gs.collections.api.block.procedure.primitive.ObjectIntProcedure;
import com.gs.collections.api.multimap.MutableMultimap;
import com.gs.collections.api.partition.set.PartitionImmutableSet;
import com.gs.collections.api.set.ImmutableSet;
import com.gs.collections.api.tuple.Pair;
import com.gs.collections.impl.EmptyIterator;
import com.gs.collections.impl.factory.Sets;
import com.gs.collections.impl.partition.set.PartitionUnifiedSet;
import net.jcip.annotations.Immutable;

/**
 * This is a zero element {@link ImmutableSet} which is created by calling the Sets.immutable.of() method.
 */
@Immutable
final class ImmutableEmptySet
        extends AbstractImmutableSet
        implements Serializable
{
    static final ImmutableSet INSTANCE = new ImmutableEmptySet();
    private static final PartitionImmutableSet EMPTY = new PartitionUnifiedSet().toImmutable();

    private static final long serialVersionUID = 1L;

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

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

    @Override
    public ImmutableSet newWith(T element)
    {
        return Sets.immutable.of(element);
    }

    @Override
    public ImmutableSet newWithAll(Iterable elements)
    {
        return Sets.immutable.ofAll(elements);
    }

    @Override
    public ImmutableSet newWithout(T element)
    {
        return this;
    }

    @Override
    public ImmutableSet newWithoutAll(Iterable elements)
    {
        return this;
    }

    public int size()
    {
        return 0;
    }

    @Override
    public boolean contains(Object obj)
    {
        return false;
    }

    public void forEach(Procedure procedure)
    {
    }

    @Override
    public void forEachWithIndex(ObjectIntProcedure objectIntProcedure)
    {
    }

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

    @Override
    public T getFirst()
    {
        return null;
    }

    @Override
    public T getLast()
    {
        return null;
    }

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

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

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

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

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

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

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

    @Override
    public  ImmutableSet> zip(Iterable that)
    {
        return Sets.immutable.of();
    }

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

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

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

    @Override
    public ImmutableSet select(Predicate predicate)
    {
        return this;
    }

    @Override
    public ImmutableSet reject(Predicate predicate)
    {
        return this;
    }

    @Override
    public PartitionImmutableSet partition(Predicate predicate)
    {
        return (PartitionImmutableSet) EMPTY;
    }

    @Override
    public  ImmutableSet collect(Function function)
    {
        return Sets.immutable.of();
    }

    @Override
    public  ImmutableSet collectIf(Predicate predicate, Function function)
    {
        return Sets.immutable.of();
    }

    @Override
    public  ImmutableSet flatCollect(Function> function)
    {
        return Sets.immutable.of();
    }

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

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

    @Override
    public boolean isEmpty()
    {
        return true;
    }

    @Override
    public boolean notEmpty()
    {
        return false;
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    @Override
    public int injectInto(int injectedValue, IntObjectToIntFunction intObjectToIntFunction)
    {
        return injectedValue;
    }

    @Override
    public long injectInto(long injectedValue, LongObjectToLongFunction longObjectToLongFunction)
    {
        return injectedValue;
    }

    @Override
    public double injectInto(double injectedValue, DoubleObjectToDoubleFunction doubleObjectToDoubleFunction)
    {
        return injectedValue;
    }

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

    @Override
    public String makeString()
    {
        return "";
    }

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

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

    @Override
    public void appendString(Appendable appendable)
    {
    }

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

    @Override
    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);
        }
    }

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

    




    
    
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