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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;

import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.io.Serializable;
import java.util.Collection;
import java.util.Comparator;
import java.util.EmptyStackException;
import java.util.Iterator;

import com.gs.collections.api.LazyIterable;
import com.gs.collections.api.RichIterable;
import com.gs.collections.api.bag.MutableBag;
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.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.ListIterable;
import com.gs.collections.api.list.MutableList;
import com.gs.collections.api.map.ImmutableMap;
import com.gs.collections.api.map.MapIterable;
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.list.ImmutableListMultimap;
import com.gs.collections.api.partition.stack.PartitionImmutableStack;
import com.gs.collections.api.set.MutableSet;
import com.gs.collections.api.set.sorted.MutableSortedSet;
import com.gs.collections.api.stack.ImmutableStack;
import com.gs.collections.api.stack.MutableStack;
import com.gs.collections.api.stack.StackIterable;
import com.gs.collections.api.stack.primitive.ImmutableBooleanStack;
import com.gs.collections.api.stack.primitive.ImmutableByteStack;
import com.gs.collections.api.stack.primitive.ImmutableCharStack;
import com.gs.collections.api.stack.primitive.ImmutableDoubleStack;
import com.gs.collections.api.stack.primitive.ImmutableFloatStack;
import com.gs.collections.api.stack.primitive.ImmutableIntStack;
import com.gs.collections.api.stack.primitive.ImmutableLongStack;
import com.gs.collections.api.stack.primitive.ImmutableShortStack;
import com.gs.collections.api.tuple.Pair;
import com.gs.collections.impl.block.factory.Comparators;
import com.gs.collections.impl.block.factory.Predicates;
import com.gs.collections.impl.block.procedure.MutatingAggregationProcedure;
import com.gs.collections.impl.block.procedure.NonMutatingAggregationProcedure;
import com.gs.collections.impl.block.procedure.checked.CheckedProcedure;
import com.gs.collections.impl.list.Interval;
import com.gs.collections.impl.list.mutable.FastList;
import com.gs.collections.impl.map.mutable.UnifiedMap;
import com.gs.collections.impl.multimap.list.FastListMultimap;
import com.gs.collections.impl.partition.stack.PartitionArrayStack;
import com.gs.collections.impl.stack.mutable.ArrayStack;
import com.gs.collections.impl.stack.mutable.primitive.BooleanArrayStack;
import com.gs.collections.impl.stack.mutable.primitive.ByteArrayStack;
import com.gs.collections.impl.stack.mutable.primitive.CharArrayStack;
import com.gs.collections.impl.stack.mutable.primitive.DoubleArrayStack;
import com.gs.collections.impl.stack.mutable.primitive.FloatArrayStack;
import com.gs.collections.impl.stack.mutable.primitive.IntArrayStack;
import com.gs.collections.impl.stack.mutable.primitive.LongArrayStack;
import com.gs.collections.impl.stack.mutable.primitive.ShortArrayStack;
import com.gs.collections.impl.utility.Iterate;
import com.gs.collections.impl.utility.LazyIterate;
import net.jcip.annotations.Immutable;

/**
 * The immutable equivalent of ArrayStack. Wraps a FastList.
 */
@Immutable
final class ImmutableArrayStack implements ImmutableStack, Serializable
{
    private static final long serialVersionUID = 1L;
    private final FastList delegate;

    private ImmutableArrayStack(T[] newElements)
    {
        this.delegate = FastList.newListWith(newElements);
    }

    private ImmutableArrayStack(FastList newElements)
    {
        this.delegate = newElements;
    }

    public static  ImmutableStack newStack()
    {
        return new ImmutableArrayStack(FastList.newList());
    }

    public static  ImmutableArrayStack newStack(Iterable iterable)
    {
        return new ImmutableArrayStack((E[]) Iterate.toArray(iterable));
    }

    public static  ImmutableArrayStack newStackWith(E... elements)
    {
        return new ImmutableArrayStack(elements.clone());
    }

    public static  ImmutableArrayStack newStackFromTopToBottom(Iterable items)
    {
        return new ImmutableArrayStack(FastList.newList(items).reverseThis());
    }

    public static  ImmutableArrayStack newStackFromTopToBottom(T... items)
    {
        return new ImmutableArrayStack(FastList.newListWith(items).reverseThis());
    }

    public ImmutableStack push(T item)
    {
        FastList newDelegate = FastList.newList(this.delegate);
        newDelegate.add(item);
        return new ImmutableArrayStack(newDelegate);
    }

    public ImmutableStack pop()
    {
        this.checkEmptyStack();
        FastList newDelegate = FastList.newList(this.delegate);
        newDelegate.remove(this.delegate.size() - 1);
        return new ImmutableArrayStack(newDelegate);
    }

    public ImmutableStack pop(int count)
    {
        this.checkNegativeCount(count);
        if (this.checkZeroCount(count))
        {
            return this;
        }
        this.checkEmptyStack();
        this.checkSizeLessThanCount(count);
        FastList newDelegate = this.delegate.clone();
        while (count > 0)
        {
            newDelegate.remove(this.delegate.size() - 1);
            count--;
        }
        return new ImmutableArrayStack(newDelegate);
    }

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

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

    public ListIterable peek(int count)
    {
        this.checkNegativeCount(count);
        if (this.checkZeroCount(count))
        {
            return FastList.newList();
        }
        this.checkEmptyStack();
        this.checkSizeLessThanCount(count);
        return FastList.newList(this.asLazy().take(count));
    }

    private boolean checkZeroCount(int count)
    {
        return count == 0;
    }

    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());
        }
    }

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

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

    public T peekAt(int index)
    {
        this.checkNegativeCount(index);
        this.checkEmptyStack();
        this.checkSizeLessThanOrEqualToIndex(index);
        return this.delegate.get(this.delegate.size() - 1 - index);
    }

    public T getFirst()
    {
        return this.peek();
    }

    public T getLast()
    {
        throw new UnsupportedOperationException("Cannot call getLast() on " + this.getClass().getSimpleName());
    }

    public boolean contains(Object object)
    {
        return this.delegate.asReversed().contains(object);
    }

    public boolean containsAllIterable(Iterable source)
    {
        return this.delegate.asReversed().containsAllIterable(source);
    }

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

    public boolean containsAllArguments(Object... elements)
    {
        return this.delegate.asReversed().containsAllArguments(elements);
    }

    public MutableStack toStack()
    {
        return ArrayStack.newStackFromTopToBottom(this);
    }

    public ImmutableStack select(Predicate predicate)
    {
        return ImmutableArrayStack.newStackFromTopToBottom(this.delegate.asReversed().select(predicate).toList());
    }

    public 

ImmutableStack selectWith(Predicate2 predicate, P parameter) { return this.select(Predicates.bind(predicate, parameter)); } public > R select(Predicate predicate, R target) { return this.delegate.asReversed().select(predicate, target); } public > R selectWith(Predicate2 predicate, P parameter, R targetCollection) { return this.delegate.asReversed().selectWith(predicate, parameter, targetCollection); } public ImmutableStack reject(Predicate predicate) { return ImmutableArrayStack.newStackFromTopToBottom(this.delegate.asReversed().reject(predicate).toList()); } public > R reject(Predicate predicate, R target) { return this.delegate.asReversed().reject(predicate, target); } public

ImmutableStack rejectWith(Predicate2 predicate, P parameter) { return this.reject(Predicates.bind(predicate, parameter)); } public > R rejectWith(Predicate2 predicate, P parameter, R targetCollection) { return this.delegate.asReversed().rejectWith(predicate, parameter, targetCollection); } public PartitionImmutableStack partition(Predicate predicate) { PartitionArrayStack partitionMutableStack = new PartitionArrayStack(); this.delegate.asReversed().forEach(new PartitionArrayStack.PartitionProcedure(predicate, partitionMutableStack)); return partitionMutableStack.toImmutable(); } public

PartitionImmutableStack partitionWith(Predicate2 predicate, P parameter) { PartitionArrayStack partitionMutableStack = new PartitionArrayStack(); this.delegate.asReversed().forEach(new PartitionArrayStack.PartitionPredicate2Procedure(predicate, parameter, partitionMutableStack)); return partitionMutableStack.toImmutable(); } public RichIterable selectInstancesOf(Class clazz) { return ImmutableArrayStack.newStackFromTopToBottom(this.delegate.asReversed().selectInstancesOf(clazz).toList()); } public ImmutableStack collect(Function function) { return ImmutableArrayStack.newStackFromTopToBottom(this.delegate.asReversed().collect(function)); } public ImmutableBooleanStack collectBoolean(final BooleanFunction booleanFunction) { final BooleanArrayStack result = new BooleanArrayStack(); this.delegate.forEach(new Procedure() { public void value(T each) { result.push(booleanFunction.booleanValueOf(each)); } }); return result.toImmutable(); } public R collectBoolean(BooleanFunction booleanFunction, R target) { return this.delegate.collectBoolean(booleanFunction, target); } public ImmutableByteStack collectByte(final ByteFunction byteFunction) { final ByteArrayStack result = new ByteArrayStack(); this.delegate.forEach(new Procedure() { public void value(T each) { result.push(byteFunction.byteValueOf(each)); } }); return result.toImmutable(); } public R collectByte(ByteFunction byteFunction, R target) { return this.delegate.collectByte(byteFunction, target); } public ImmutableCharStack collectChar(final CharFunction charFunction) { final CharArrayStack result = new CharArrayStack(); this.delegate.forEach(new Procedure() { public void value(T each) { result.push(charFunction.charValueOf(each)); } }); return result.toImmutable(); } public R collectChar(CharFunction charFunction, R target) { return this.delegate.collectChar(charFunction, target); } public ImmutableDoubleStack collectDouble(final DoubleFunction doubleFunction) { final DoubleArrayStack result = new DoubleArrayStack(); this.delegate.forEach(new Procedure() { public void value(T each) { result.push(doubleFunction.doubleValueOf(each)); } }); return result.toImmutable(); } public R collectDouble(DoubleFunction doubleFunction, R target) { return this.delegate.collectDouble(doubleFunction, target); } public ImmutableFloatStack collectFloat(final FloatFunction floatFunction) { final FloatArrayStack result = new FloatArrayStack(); this.delegate.forEach(new Procedure() { public void value(T each) { result.push(floatFunction.floatValueOf(each)); } }); return result.toImmutable(); } public R collectFloat(FloatFunction floatFunction, R target) { return this.delegate.collectFloat(floatFunction, target); } public ImmutableIntStack collectInt(final IntFunction intFunction) { final IntArrayStack result = new IntArrayStack(); this.delegate.forEach(new Procedure() { public void value(T each) { result.push(intFunction.intValueOf(each)); } }); return result.toImmutable(); } public R collectInt(IntFunction intFunction, R target) { return this.delegate.collectInt(intFunction, target); } public ImmutableLongStack collectLong(final LongFunction longFunction) { final LongArrayStack result = new LongArrayStack(); this.delegate.forEach(new Procedure() { public void value(T each) { result.push(longFunction.longValueOf(each)); } }); return result.toImmutable(); } public R collectLong(LongFunction longFunction, R target) { return this.delegate.collectLong(longFunction, target); } public ImmutableShortStack collectShort(final ShortFunction shortFunction) { final ShortArrayStack result = new ShortArrayStack(); this.delegate.forEach(new Procedure() { public void value(T each) { result.push(shortFunction.shortValueOf(each)); } }); return result.toImmutable(); } public R collectShort(ShortFunction shortFunction, R target) { return this.delegate.collectShort(shortFunction, target); } public > R collect(Function function, R target) { return this.delegate.asReversed().collect(function, target); } public ImmutableStack collectWith(Function2 function, P parameter) { return ImmutableArrayStack.newStackFromTopToBottom(this.delegate.asReversed().collectWith(function, parameter).toList()); } public > R collectWith(Function2 function, P parameter, R targetCollection) { return this.delegate.asReversed().collectWith(function, parameter, targetCollection); } public ImmutableStack collectIf(Predicate predicate, Function function) { return ImmutableArrayStack.newStackFromTopToBottom(this.delegate.asReversed().collectIf(predicate, function).toList()); } public > R collectIf(Predicate predicate, Function function, R target) { return this.delegate.asReversed().collectIf(predicate, function, target); } public ImmutableStack flatCollect(Function> function) { return ImmutableArrayStack.newStackFromTopToBottom(this.delegate.asReversed().flatCollect(function).toList()); } public > R flatCollect(Function> function, R target) { return this.delegate.asReversed().flatCollect(function, target); } public T detect(Predicate predicate) { return this.delegate.asReversed().detect(predicate); } public

T detectWith(Predicate2 predicate, P parameter) { return this.delegate.asReversed().detectWith(predicate, parameter); } public T detectIfNone(Predicate predicate, Function0 function) { return this.delegate.asReversed().detectIfNone(predicate, function); } public

T detectWithIfNone(Predicate2 predicate, P parameter, Function0 function) { return this.delegate.asReversed().detectWithIfNone(predicate, parameter, function); } public int count(Predicate predicate) { return this.delegate.asReversed().count(predicate); } public

int countWith(Predicate2 predicate, P parameter) { return this.delegate.asReversed().countWith(predicate, parameter); } public boolean anySatisfy(Predicate predicate) { return this.delegate.asReversed().anySatisfy(predicate); } public

boolean anySatisfyWith(Predicate2 predicate, P parameter) { return this.delegate.asReversed().anySatisfyWith(predicate, parameter); } public boolean allSatisfy(Predicate predicate) { return this.delegate.asReversed().allSatisfy(predicate); } public

boolean allSatisfyWith(Predicate2 predicate, P parameter) { return this.delegate.asReversed().allSatisfyWith(predicate, parameter); } public boolean noneSatisfy(Predicate predicate) { return this.delegate.asReversed().noneSatisfy(predicate); } public

boolean noneSatisfyWith(Predicate2 predicate, P parameter) { return this.delegate.asReversed().noneSatisfyWith(predicate, parameter); } public IV injectInto(IV injectedValue, Function2 function) { return this.delegate.asReversed().injectInto(injectedValue, function); } public int injectInto(int injectedValue, IntObjectToIntFunction intObjectToIntFunction) { return this.delegate.asReversed().injectInto(injectedValue, intObjectToIntFunction); } public long injectInto(long injectedValue, LongObjectToLongFunction longObjectToLongFunction) { return this.delegate.asReversed().injectInto(injectedValue, longObjectToLongFunction); } public double injectInto(double injectedValue, DoubleObjectToDoubleFunction doubleObjectToDoubleFunction) { return this.delegate.asReversed().injectInto(injectedValue, doubleObjectToDoubleFunction); } public float injectInto(float injectedValue, FloatObjectToFloatFunction floatObjectToFloatFunction) { return this.delegate.asReversed().injectInto(injectedValue, floatObjectToFloatFunction); } public MutableList toList() { return this.delegate.asReversed().toList(); } public MutableList toSortedList() { return this.delegate.asReversed().toSortedList(); } public MutableList toSortedList(Comparator comparator) { return this.delegate.asReversed().toSortedList(comparator); } public > MutableList toSortedListBy(Function function) { return this.delegate.asReversed().toSortedListBy(function); } public MutableSet toSet() { return this.delegate.asReversed().toSet(); } public MutableSortedSet toSortedSet() { return this.delegate.asReversed().toSortedSet(); } public MutableSortedSet toSortedSet(Comparator comparator) { return this.delegate.asReversed().toSortedSet(comparator); } public > MutableSortedSet toSortedSetBy(Function function) { return this.delegate.asReversed().toSortedSetBy(function); } public MutableBag toBag() { return this.delegate.asReversed().toBag(); } public MutableMap toMap(Function keyFunction, Function valueFunction) { return this.delegate.asReversed().toMap(keyFunction, valueFunction); } public MutableSortedMap toSortedMap(Function keyFunction, Function valueFunction) { return this.delegate.asReversed().toSortedMap(keyFunction, valueFunction); } public MutableSortedMap toSortedMap(Comparator comparator, Function keyFunction, Function valueFunction) { return this.delegate.asReversed().toSortedMap(comparator, keyFunction, valueFunction); } public LazyIterable asLazy() { return LazyIterate.adapt(this); } public Object[] toArray() { return this.delegate.asReversed().toArray(); } public T[] toArray(T[] a) { return this.delegate.asReversed().toArray(a); } public T min(Comparator comparator) { return this.delegate.asReversed().min(comparator); } public T max(Comparator comparator) { return this.delegate.asReversed().max(comparator); } public T min() { return this.delegate.asReversed().min(); } public T max() { return this.delegate.asReversed().max(); } public > T minBy(Function function) { return this.delegate.asReversed().toList().minBy(function); } public > T maxBy(Function function) { return this.delegate.asReversed().maxBy(function); } public long sumOfInt(IntFunction intFunction) { return this.delegate.asReversed().sumOfInt(intFunction); } public double sumOfFloat(FloatFunction floatFunction) { return this.delegate.asReversed().sumOfFloat(floatFunction); } public long sumOfLong(LongFunction longFunction) { return this.delegate.asReversed().sumOfLong(longFunction); } public double sumOfDouble(DoubleFunction doubleFunction) { return this.delegate.asReversed().sumOfDouble(doubleFunction); } 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 ImmutableListMultimap groupBy(Function function) { return this.groupBy(function, FastListMultimap.newMultimap()).toImmutable(); } public > R groupBy(Function function, R target) { return this.delegate.asReversed().groupBy(function, target); } public ImmutableListMultimap groupByEach(Function> function) { return this.groupByEach(function, FastListMultimap.newMultimap()).toImmutable(); } public > R groupByEach(Function> function, R target) { return this.delegate.asReversed().groupByEach(function, target); } public ImmutableMap groupByUniqueKey(Function function) { throw new UnsupportedOperationException(this.getClass().getSimpleName() + ".groupByUniqueKey() not implemented yet"); } public ImmutableStack> zip(Iterable that) { return ImmutableArrayStack.newStackFromTopToBottom(this.delegate.asReversed().zip(that).toList()); } public >> R zip(Iterable that, R target) { return this.delegate.asReversed().zip(that, target); } public ImmutableStack> zipWithIndex() { int maxIndex = this.delegate.size() - 1; Interval indicies = Interval.fromTo(0, maxIndex); return ImmutableArrayStack.newStackFromTopToBottom(this.delegate.asReversed().zip(indicies).toList()); } public >> R zipWithIndex(R target) { return this.delegate.asReversed().zipWithIndex(target); } public ImmutableStack toImmutable() { return this; } public RichIterable> chunk(int size) { return this.delegate.asReversed().chunk(size); } public MapIterable aggregateInPlaceBy(Function groupBy, Function0 zeroValueFactory, Procedure2 mutatingAggregator) { MutableMap map = UnifiedMap.newMap(); this.forEach(new MutatingAggregationProcedure(map, groupBy, zeroValueFactory, mutatingAggregator)); return map; } public MapIterable aggregateBy(Function groupBy, Function0 zeroValueFactory, Function2 nonMutatingAggregator) { MutableMap map = UnifiedMap.newMap(); this.forEach(new NonMutatingAggregationProcedure(map, groupBy, zeroValueFactory, nonMutatingAggregator)); return map; } public int size() { return this.delegate.size(); } public boolean isEmpty() { return this.delegate.isEmpty(); } public boolean notEmpty() { return this.delegate.notEmpty(); } public void forEach(Procedure procedure) { this.delegate.reverseForEach(procedure); } public void forEachWithIndex(ObjectIntProcedure objectIntProcedure) { this.delegate.asReversed().forEachWithIndex(objectIntProcedure); } public

void forEachWith(Procedure2 procedure, P parameter) { this.delegate.asReversed().forEachWith(procedure, parameter); } public Iterator iterator() { return this.delegate.asReversed().iterator(); } @Override public boolean equals(Object o) { if (this == o) { return true; } if (!(o instanceof StackIterable)) { return false; } StackIterable that = (StackIterable) o; if (that instanceof ImmutableArrayStack) { return this.delegate.equals(((ImmutableArrayStack) that).delegate); } Iterator thisIterator = this.iterator(); Iterator thatIterator = that.iterator(); while (thisIterator.hasNext() && thatIterator.hasNext()) { if (!Comparators.nullSafeEquals(thisIterator.next(), thatIterator.next())) { return false; } } return !thisIterator.hasNext() && !thatIterator.hasNext(); } @Override public String toString() { return this.delegate.asReversed().makeString("[", ", ", "]"); } @Override public int hashCode() { int hashCode = 1; for (T each : this) { hashCode = 31 * hashCode + (each == null ? 0 : each.hashCode()); } return hashCode; } private Object writeReplace() { return new ImmutableStackSerializationProxy(this); } private static class ImmutableStackSerializationProxy implements Externalizable { private static final long serialVersionUID = 1L; private StackIterable stack; @SuppressWarnings("UnusedDeclaration") public ImmutableStackSerializationProxy() { // Empty constructor for Externalizable class } protected ImmutableStackSerializationProxy(StackIterable stack) { this.stack = stack; } public void writeExternal(final ObjectOutput out) throws IOException { out.writeInt(this.stack.size()); try { this.stack.forEach(new CheckedProcedure() { @Override public void safeValue(T object) throws IOException { out.writeObject(object); } }); } catch (RuntimeException e) { if (e.getCause() instanceof IOException) { throw (IOException) e.getCause(); } throw e; } } public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException { int size = in.readInt(); FastList deserializedDelegate = new FastList(size); for (int i = 0; i < size; i++) { deserializedDelegate.add((T) in.readObject()); } this.stack = ImmutableArrayStack.newStackFromTopToBottom(deserializedDelegate); } protected Object readResolve() { return this.stack; } } }