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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.stack.immutable.primitive;

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

import com.gs.collections.api.BooleanIterable;
import com.gs.collections.api.LazyBooleanIterable;
import com.gs.collections.api.bag.primitive.MutableBooleanBag;
import com.gs.collections.api.block.function.primitive.BooleanToObjectFunction;
import com.gs.collections.api.block.function.primitive.ObjectBooleanToObjectFunction;
import com.gs.collections.api.block.predicate.primitive.BooleanPredicate;
import com.gs.collections.api.block.procedure.primitive.BooleanProcedure;
import com.gs.collections.api.iterator.BooleanIterator;
import com.gs.collections.api.list.primitive.BooleanList;
import com.gs.collections.api.list.primitive.MutableBooleanList;
import com.gs.collections.api.set.primitive.MutableBooleanSet;
import com.gs.collections.api.stack.ImmutableStack;
import com.gs.collections.api.stack.primitive.ImmutableBooleanStack;
import com.gs.collections.api.stack.primitive.BooleanStack;
import com.gs.collections.impl.bag.mutable.primitive.BooleanHashBag;
import com.gs.collections.impl.factory.Stacks;
import com.gs.collections.impl.factory.primitive.BooleanStacks;
import com.gs.collections.impl.lazy.primitive.LazyBooleanIterableAdapter;
import com.gs.collections.impl.list.mutable.primitive.BooleanArrayList;
import com.gs.collections.impl.set.mutable.primitive.BooleanHashSet;
import net.jcip.annotations.Immutable;

/**
 * ImmutableBooleanEmptyStack is an optimization for {@link ImmutableBooleanStack} of size 0.
 * This file was automatically generated from template file immutablePrimitiveEmptyStack.stg.
 */
@Immutable
final class ImmutableBooleanEmptyStack implements ImmutableBooleanStack, Serializable
{
    static final ImmutableBooleanStack INSTANCE = new ImmutableBooleanEmptyStack();
    private static final long serialVersionUID = 1L;

    private Object readResolve()
    {
        return INSTANCE;
    }

    public BooleanIterator booleanIterator()
    {
        return new InternalBooleanIterator();
    }

    public void forEach(BooleanProcedure procedure)
    {
    }

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

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

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

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

    public boolean peek()
    {
        throw new EmptyStackException();
    }

    public BooleanList peek(int count)
    {
        this.checkNegativeCount(count);
        if (count == 0)
        {
            return new BooleanArrayList(0);
        }
        throw new EmptyStackException();
    }

    public boolean peekAt(int index)
    {
        this.checkNegativeCount(index);
        throw new EmptyStackException();
    }

    public ImmutableBooleanStack select(BooleanPredicate predicate)
    {
        return this;
    }

    public ImmutableBooleanStack reject(BooleanPredicate predicate)
    {
        return this;
    }

    public boolean detectIfNone(BooleanPredicate predicate, boolean ifNone)
    {
        return ifNone;
    }

    public  ImmutableStack collect(BooleanToObjectFunction function)
    {
        return Stacks.immutable.of();
    }

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

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

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

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

    public MutableBooleanList toList()
    {
        return new BooleanArrayList();
    }

    public MutableBooleanSet toSet()
    {
        return new BooleanHashSet();
    }

    public MutableBooleanBag toBag()
    {
        return new BooleanHashBag();
    }

    public LazyBooleanIterable asLazy()
    {
        return new LazyBooleanIterableAdapter(this);
    }

    public ImmutableBooleanStack toImmutable()
    {
        return this;
    }

    public ImmutableBooleanStack push(boolean element)
    {
        return BooleanStacks.immutable.with(element);
    }

    public ImmutableBooleanStack pop()
    {
        throw new EmptyStackException();
    }

    public ImmutableBooleanStack pop(int count)
    {
        this.checkNegativeCount(count);
        if (count == 0)
        {
            return this;
        }
        throw new EmptyStackException();
    }

    private void checkNegativeCount(int count)
    {
        if (count < 0)
        {
            throw new IllegalArgumentException("Count must be positive but was " + count);
        }
    }

    public int size()
    {
        return 0;
    }

    public boolean isEmpty()
    {
        return true;
    }

    public boolean notEmpty()
    {
        return false;
    }

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

    @Override
    public boolean equals(Object otherStack)
    {
        if (otherStack == this)
        {
            return true;
        }
        if (!(otherStack instanceof BooleanStack))
        {
            return false;
        }
        BooleanStack stack = (BooleanStack) otherStack;
        return stack.isEmpty();
    }

    @Override
    public int hashCode()
    {
        return 1;
    }

    @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);
        }
    }

    private static class InternalBooleanIterator implements BooleanIterator
    {
        public boolean hasNext()
        {
            return false;
        }

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