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/*
* The MIT License (MIT)
*
* FXGL - JavaFX Game Library
*
* Copyright (c) 2015-2017 AlmasB ([email protected])
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package org.jbox2d.pooling.normal;
import org.jbox2d.pooling.IDynamicStack;
public abstract class MutableStack implements IDynamicStack {
private E[] stack;
private int index;
private int size;
public MutableStack(int argInitSize) {
index = 0;
stack = null;
index = 0;
extendStack(argInitSize);
}
private void extendStack(int argSize) {
E[] newStack = newArray(argSize);
if (stack != null) {
System.arraycopy(stack, 0, newStack, 0, size);
}
for (int i = 0; i < newStack.length; i++) {
newStack[i] = newInstance();
}
stack = newStack;
size = newStack.length;
}
public final E pop() {
if (index >= size) {
extendStack(size * 2);
}
return stack[index++];
}
public final void push(E argObject) {
assert (index > 0);
stack[--index] = argObject;
}
/** Creates a new instance of the object contained by this stack. */
protected abstract E newInstance();
protected abstract E[] newArray(int size);
}