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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;
/**
* @author lambdamix
*/
import java.util.EmptyStackException;
public class LongStack {
private long[] data;
private int size;
public LongStack(int initialCapacity) {
data = new long[initialCapacity];
size = 0;
}
public LongStack() {
this(5);
}
public void push(long t) {
if (size >= data.length) {
long[] newdata = new long[data.length * 3 / 2];
System.arraycopy(data, 0, newdata, 0, size);
data = newdata;
}
data[size++] = t;
}
public long peek() {
if (size == 0) throw new EmptyStackException();
return data[size - 1];
}
public long pop() {
if (size == 0) throw new EmptyStackException();
return data[--size];
}
public boolean empty() {
return size == 0;
}
@Override
public boolean equals(Object o) {
if (o instanceof LongStack) {
LongStack otherStack = (LongStack)o;
if (size != otherStack.size) return false;
for (int i = 0; i < otherStack.size; i++) {
if (data[i] != otherStack.data[i]) return false;
}
return true;
}
return false;
}
public void clear() {
size = 0;
}
}
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