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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.mutable.primitive;

import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.EmptyStackException;

import com.gs.collections.api.IntIterable;
import com.gs.collections.api.LazyIntIterable;
import com.gs.collections.api.bag.primitive.MutableIntBag;
import com.gs.collections.api.block.function.primitive.IntToObjectFunction;
import com.gs.collections.api.block.function.primitive.ObjectIntToObjectFunction;
import com.gs.collections.api.block.predicate.primitive.IntPredicate;
import com.gs.collections.api.block.procedure.primitive.IntProcedure;
import com.gs.collections.api.iterator.IntIterator;
import com.gs.collections.api.list.primitive.IntList;
import com.gs.collections.api.list.primitive.MutableIntList;
import com.gs.collections.api.set.primitive.MutableIntSet;
import com.gs.collections.api.stack.MutableStack;
import com.gs.collections.api.stack.primitive.IntStack;
import com.gs.collections.api.stack.primitive.ImmutableIntStack;
import com.gs.collections.api.stack.primitive.MutableIntStack;
import com.gs.collections.impl.bag.mutable.primitive.IntHashBag;
import com.gs.collections.impl.factory.primitive.IntStacks;
import com.gs.collections.impl.lazy.primitive.LazyIntIterableAdapter;
import com.gs.collections.impl.list.mutable.primitive.IntArrayList;
import com.gs.collections.impl.set.mutable.primitive.IntHashSet;
import com.gs.collections.impl.stack.mutable.ArrayStack;
import net.jcip.annotations.NotThreadSafe;

/**
 * IntArrayStack is similar to {@link ArrayStack}, and is memory-optimized for int primitives.
 * This file was automatically generated from template file primitiveArrayStack.stg.
 */
@NotThreadSafe
public final class IntArrayStack
        implements MutableIntStack, Externalizable
{
    private static final long serialVersionUID = 1L;

    private transient IntArrayList delegate;

    public IntArrayStack()
    {
        this.delegate = new IntArrayList();
    }

    private IntArrayStack(int size)
    {
        this.delegate = new IntArrayList(size);
    }

    private IntArrayStack(int... items)
    {
        this.delegate = new IntArrayList(items);
    }

    public static IntArrayStack newStackFromTopToBottom(int... items)
    {
        IntArrayStack stack = new IntArrayStack(items.length);
        for (int i = items.length - 1; i >= 0; i--)
        {
            stack.push(items[i]);
        }
        return stack;
    }

    public static IntArrayStack newStackWith(int... items)
    {
        return new IntArrayStack(items);
    }

    public static IntArrayStack newStack(IntIterable items)
    {
        IntArrayStack stack = new IntArrayStack(items.size());
        stack.delegate = IntArrayList.newList(items);
        return stack;
    }

    public static IntArrayStack newStackFromTopToBottom(IntIterable items)
    {
        IntArrayStack stack = new IntArrayStack(items.size());
        stack.delegate = IntArrayList.newList(items).reverseThis();
        return stack;
    }

    public void push(int item)
    {
        this.delegate.add(item);
    }

    public int pop()
    {
        this.checkEmptyStack();
        return this.delegate.removeAtIndex(this.delegate.size() - 1);
    }

    private void checkEmptyStack()
    {
        if (this.delegate.isEmpty())
        {
            throw new EmptyStackException();
        }
    }

    public IntList pop(int count)
    {
        this.checkPositiveValueForCount(count);
        this.checkSizeLessThanCount(count);
        if (count == 0)
        {
            return new IntArrayList(0);
        }
        MutableIntList subList = new IntArrayList(count);
        while (count > 0)
        {
            subList.add(this.pop());
            count--;
        }
        return subList;
    }

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

    private void checkSizeLessThanCount(int count)
    {
        if (this.delegate.size() < count)
        {
            throw new IllegalArgumentException("Count must be less than size: Count = " + count + " Size = " + this.delegate.size());
        }
    }

    public MutableIntStack select(IntPredicate predicate)
    {
        return newStackFromTopToBottom(this.delegate.asReversed().select(predicate));
    }

    public MutableIntStack reject(IntPredicate predicate)
    {
        return newStackFromTopToBottom(this.delegate.asReversed().reject(predicate));
    }

    public int peek()
    {
        this.checkEmptyStack();
        return this.delegate.getLast();
    }

    public IntList peek(int count)
    {
        this.checkPositiveValueForCount(count);
        this.checkSizeLessThanCount(count);
        if (count == 0)
        {
            return new IntArrayList(0);
        }
        MutableIntList subList = new IntArrayList(count);
        int index = this.delegate.size() - 1;
        for (int i = 0; i < count; i++)
        {
            subList.add(this.delegate.get(index - i));
        }
        return subList;
    }

    public int peekAt(int index)
    {
        this.rangeCheck(index);
        return this.delegate.get(this.delegate.size() - 1 - index);
    }

    private void rangeCheck(int index)
    {
        if (index < 0 || index > this.delegate.size() - 1)
        {
            throw new IllegalArgumentException("Index " + index + " out of range.Should be between 0 and " + (this.delegate.size() - 1));
        }
    }

    public IntIterator intIterator()
    {
        return this.delegate.asReversed().intIterator();
    }

    public void forEach(IntProcedure procedure)
    {
        this.delegate.asReversed().forEach(procedure);
    }

    public int size()
    {
        return this.delegate.size();
    }

    public boolean isEmpty()
    {
        return this.delegate.isEmpty();
    }

    public boolean notEmpty()
    {
        return this.delegate.notEmpty();
    }

    public int count(IntPredicate predicate)
    {
        return this.delegate.asReversed().count(predicate);
    }

    public boolean anySatisfy(IntPredicate predicate)
    {
        return this.delegate.asReversed().anySatisfy(predicate);
    }

    public boolean allSatisfy(IntPredicate predicate)
    {
        return this.delegate.asReversed().allSatisfy(predicate);
    }

    public boolean noneSatisfy(IntPredicate predicate)
    {
        return this.delegate.asReversed().noneSatisfy(predicate);
    }

    public int detectIfNone(IntPredicate predicate, int ifNone)
    {
        return this.delegate.asReversed().detectIfNone(predicate, ifNone);
    }

    public  MutableStack collect(IntToObjectFunction function)
    {
        return ArrayStack.newStackFromTopToBottom(this.delegate.asReversed().collect(function));
    }

    public  V injectInto(V injectedValue, ObjectIntToObjectFunction function)
    {
        return this.delegate.asReversed().injectInto(injectedValue, function);
    }

    public long sum()
    {
        return this.delegate.sum();
    }

    public int max()
    {
        return this.delegate.max();
    }

    public int min()
    {
        return this.delegate.min();
    }

    public int minIfEmpty(int defaultValue)
    {
        if (this.isEmpty())
        {
            return defaultValue;
        }
        return this.min();
    }

    public int maxIfEmpty(int defaultValue)
    {
        if (this.isEmpty())
        {
            return defaultValue;
        }
        return this.max();
    }

    public double average()
    {
        return this.delegate.average();
    }

    public double median()
    {
        return this.delegate.median();
    }

    public int[] toSortedArray()
    {
        return this.delegate.toSortedArray();
    }

    public int[] toArray()
    {
        return this.delegate.asReversed().toArray();
    }

    public boolean contains(int value)
    {
        return this.delegate.asReversed().contains(value);
    }

    public boolean containsAll(int... source)
    {
        return this.delegate.asReversed().containsAll(source);
    }

    public boolean containsAll(IntIterable source)
    {
        return this.delegate.asReversed().containsAll(source);
    }

    public void clear()
    {
        this.delegate.clear();
    }

    @Override
    public boolean equals(Object otherStack)
    {
        if (otherStack == this)
        {
            return true;
        }
        if (!(otherStack instanceof IntStack))
        {
            return false;
        }
        IntStack stack = (IntStack) otherStack;
        if (this.size() != stack.size())
        {
            return false;
        }
        for (int i = 0; i < this.size(); i++)
        {
            if (this.peekAt(i) != stack.peekAt(i))
            {
                return false;
            }
        }
        return true;
    }

    @Override
    public int hashCode()
    {
        int hashCode = 1;
        IntIterable iterable = this.delegate.asReversed();
        IntIterator iterator = iterable.intIterator();
        while (iterator.hasNext())
        {
            int item = iterator.next();
            hashCode = 31 * hashCode + item;
        }
        return hashCode;
    }

    @Override
    public String toString()
    {
        return this.delegate.asReversed().toString();
    }

    public String makeString()
    {
        return this.delegate.asReversed().makeString();
    }

    public String makeString(String separator)
    {
        return this.delegate.asReversed().makeString(separator);
    }

    public String makeString(String start, String separator, String end)
    {
        return this.delegate.asReversed().makeString(start, separator, end);
    }

    public void appendString(Appendable appendable)
    {
        this.delegate.asReversed().appendString(appendable);
    }

    public void appendString(Appendable appendable, String separator)
    {
        this.delegate.asReversed().appendString(appendable, separator);
    }

    public void appendString(
            Appendable appendable,
            String start,
            String separator,
            String end)
    {
        this.delegate.asReversed().appendString(appendable, start, separator, end);
    }

    public MutableIntList toList()
    {
        return IntArrayList.newList(this);
    }

    public MutableIntList toSortedList()
    {
        return IntArrayList.newList(this).sortThis();
    }

    public MutableIntSet toSet()
    {
        return IntHashSet.newSet(this);
    }

    public MutableIntBag toBag()
    {
        return IntHashBag.newBag(this);
    }

    public LazyIntIterable asLazy()
    {
        return new LazyIntIterableAdapter(this);
    }

    public MutableIntStack asUnmodifiable()
    {
        return new UnmodifiableIntStack(this);
    }

    public MutableIntStack asSynchronized()
    {
        return new SynchronizedIntStack(this);
    }

    public ImmutableIntStack toImmutable()
    {
        return IntStacks.immutable.withAll(this.delegate);
    }

    public void writeExternal(ObjectOutput out) throws IOException
    {
        out.writeInt(this.size());
        IntIterator iterator = this.delegate.asReversed().intIterator();
        while (iterator.hasNext())
        {
            int each = iterator.next();
            out.writeInt(each);
        }
    }

    public void readExternal(ObjectInput in) throws IOException
    {
        int size = in.readInt();
        int[] array = new int[size];
        for (int i = size - 1; i >= 0; i--)
        {
            array[i] = in.readInt();
        }
        this.delegate = IntArrayList.newListWith(array);
    }
}