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package bjc.utils.esodata;
import java.util.Arrays;
import java.util.stream.Stream;
/*
* Implements a spaghetti stack, which is a stack that is branched off of a
* parent stack.
*
* @param T The datatype stored in the stack.
* @author Ben Culkin
*/
class SpaghettiStack<T> extends Stack<T> {
private Stack<T> backing;
private Stack<T> parent;
/**
* Create a new empty spaghetti stack, off of the specified parent.
*
* @param par
* The parent stack
*/
public SpaghettiStack(Stack<T> par) {
backing = new SimpleStack<>();
parent = par;
}
@Override
public void push(T elm) {
backing.push(elm);
}
@Override
public T pop() {
if(backing.empty()) return parent.pop();
return backing.pop();
}
@Override
public T top() {
if(backing.empty()) return parent.top();
return backing.top();
}
@Override
public int size() {
return parent.size() + backing.size();
}
@Override
public boolean empty() {
return backing.empty() && parent.empty();
}
@Override
public String toString() {
return "[base=" + parent.toString() + ", own=" + backing.toString() + "]";
}
@SuppressWarnings("unchecked")
@Override
public T[] toArray() {
return (T[]) Stream.concat(Arrays.stream(parent.toArray()), Arrays.stream(backing.toArray())).toArray();
}
}
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