/*
 * Stack.java
 *
 * This source file is part of the FoundationDB open source project
 *
 * Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
 *
 * 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.apple.foundationdb.test;

class Stack {
	java.util.Stack<StackEntry> stack = new java.util.Stack<StackEntry>();

	void push(int idx, Object o) {
		stack.push(new StackEntry(idx, o));
	}

	void push(StackEntry e) {
		stack.push(e);
	}

	StackEntry pop() {
		return stack.pop();
	}

	void swap(int index) {
		if(index >= stack.size())
			throw new IllegalArgumentException("Stack index not valid");

		if(index > 0) {
			int fromBack = stack.size() - index - 1;
			StackEntry tmp = stack.elementAt(fromBack);
			stack.set(fromBack, stack.pop());
			stack.push(tmp);
		}
	}

	int size() {
		return stack.size();
	}

	void clear() {
		stack.clear();
	}
}