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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.set.immutable.primitive;

import java.io.IOException;
import java.io.Serializable;
import java.util.NoSuchElementException;

import com.gs.collections.api.DoubleIterable;
import com.gs.collections.api.LazyDoubleIterable;
import com.gs.collections.api.bag.primitive.MutableDoubleBag;
import com.gs.collections.api.set.ImmutableSet;
import com.gs.collections.api.set.primitive.ImmutableDoubleSet;
import com.gs.collections.api.set.primitive.DoubleSet;
import com.gs.collections.api.set.primitive.MutableDoubleSet;
import com.gs.collections.api.block.function.primitive.DoubleToObjectFunction;
import com.gs.collections.api.block.function.primitive.ObjectDoubleToObjectFunction;
import com.gs.collections.api.block.predicate.primitive.DoublePredicate;
import com.gs.collections.api.block.procedure.primitive.DoubleProcedure;
import com.gs.collections.api.iterator.DoubleIterator;
import com.gs.collections.api.list.primitive.MutableDoubleList;
import com.gs.collections.impl.bag.mutable.primitive.DoubleHashBag;
import com.gs.collections.impl.set.mutable.primitive.DoubleHashSet;
import com.gs.collections.impl.factory.Sets;
import com.gs.collections.impl.factory.primitive.DoubleSets;
import com.gs.collections.impl.lazy.primitive.LazyDoubleIterableAdapter;
import com.gs.collections.impl.list.mutable.primitive.DoubleArrayList;
import net.jcip.annotations.Immutable;

/**
 * ImmutableDoubleEmptySet is an optimization for {@link ImmutableDoubleSet} of size 0.
 * This file was automatically generated from template file immutablePrimitiveEmptySet.stg.
 *
 * @since 4.0.
 */
@Immutable
final class ImmutableDoubleEmptySet implements ImmutableDoubleSet, Serializable
{
    private static final long serialVersionUID = 1L;

    static final ImmutableDoubleSet INSTANCE = new ImmutableDoubleEmptySet();

    private Object readResolve()
    {
        return INSTANCE;
    }

    public ImmutableDoubleSet newWith(double element)
    {
        return new ImmutableDoubleSingletonSet(element);
    }

    public ImmutableDoubleSet newWithout(double element)
    {
        return this;
    }

    public ImmutableDoubleSet newWithAll(DoubleIterable elements)
    {
        return DoubleSets.immutable.withAll(elements);
    }

    public ImmutableDoubleSet newWithoutAll(DoubleIterable elements)
    {
        return this;
    }

    public int size()
    {
        return 0;
    }

    public boolean isEmpty()
    {
        return true;
    }

    public boolean notEmpty()
    {
        return false;
    }

    public boolean contains(double value)
    {
        return false;
    }

    public boolean containsAll(DoubleIterable source)
    {
        return source.isEmpty();
    }

    public boolean containsAll(double... elements)
    {
        return elements.length == 0;
    }

    public void forEach(DoubleProcedure procedure)
    {
    }

    public ImmutableDoubleSet select(DoublePredicate predicate)
    {
        return this;
    }

    public ImmutableDoubleSet reject(DoublePredicate predicate)
    {
        return this;
    }

    public  ImmutableSet collect(DoubleToObjectFunction function)
    {
        return Sets.immutable.of();
    }

    public MutableDoubleList toList()
    {
        return new DoubleArrayList();
    }

    public double detectIfNone(DoublePredicate predicate, double ifNone)
    {
        return ifNone;
    }

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

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

    public double sum()
    {
        return 0.0;
    }

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

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

    public double maxIfEmpty(double defaultValue)
    {
        return defaultValue;
    }

    public double minIfEmpty(double defaultValue)
    {
        return defaultValue;
    }

    public double average()
    {
        throw new ArithmeticException();
    }

    public double median()
    {
        throw new ArithmeticException();
    }

    public double[] toSortedArray()
    {
        return new double[0];
    }

    public MutableDoubleList toSortedList()
    {
        return new DoubleArrayList();
    }

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

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

    public  T injectInto(T injectedValue, ObjectDoubleToObjectFunction function)
    {
        return injectedValue;
    }

    @Override
    public boolean equals(Object obj)
    {
        if (obj == this)
        {
            return true;
        }
        if (!(obj instanceof DoubleSet))
        {
            return false;
        }
        DoubleSet set = (DoubleSet) obj;
        return set.isEmpty();
    }

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

    public MutableDoubleSet toSet()
    {
        return new DoubleHashSet();
    }

    public MutableDoubleBag toBag()
    {
        return new DoubleHashBag();
    }

    public DoubleSet freeze()
    {
        return this;
    }

    public ImmutableDoubleSet toImmutable()
    {
        return this;
    }

    public LazyDoubleIterable asLazy()
    {
        return new LazyDoubleIterableAdapter(this);
    }

    public double[] toArray()
    {
        return new double[0];
    }

    @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 DoubleIterator doubleIterator()
    {
        return new InternalDoubleIterator();
    }

    private static class InternalDoubleIterator implements DoubleIterator
    {
        public boolean hasNext()
        {
            return false;
        }

        public double next()
        {
            throw new NoSuchElementException();
        }
    }
}