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/*
* Copyright 2000-2014 JetBrains s.r.o.
*
* 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.intellij.util.containers;
import org.jetbrains.annotations.Nullable;
import java.util.*;
/**
* A drop-in replacement for {@link java.util.Stack} based on {@link java.util.ArrayList} (instead of {@link java.util.Vector})
* and therefore is (1) not synchronized and (2) faster.
*
* @author max
*/
public class Stack<T> extends ArrayList<T> {
public Stack() { }
public Stack(int initialCapacity) {
super(initialCapacity);
}
public Stack(Collection<T> init) {
super(init);
}
public Stack(T... items) {
for (T item : items) {
push(item);
}
}
public void push(T t) {
add(t);
}
public T peek() {
final int size = size();
if (size == 0) throw new EmptyStackException();
return get(size - 1);
}
public T pop() {
final int size = size();
if (size == 0) throw new EmptyStackException();
return remove(size - 1);
}
@Nullable
public T tryPop() {
return isEmpty() ? null : pop();
}
public boolean empty() {
return isEmpty();
}
@Override
public boolean equals(Object o) {
if (o instanceof RandomAccess && o instanceof List) {
List other = (List)o;
if (size() != other.size()) {
return false;
}
for (int i = 0; i < other.size(); i++) {
Object o1 = other.get(i);
Object o2 = get(i);
if (!(o1 == null ? o2 == null : o1.equals(o2))) {
return false;
}
}
return true;
}
return super.equals(o);
}
}
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