Fast stack
//package com.thoughtworks.xstream.core.util;
public final class FastStack {
private Object[] stack;
private int pointer;
public FastStack(int initialCapacity) {
stack = new Object[initialCapacity];
}
public Object push(Object value) {
if (pointer + 1 >= stack.length) {
resizeStack(stack.length * 2);
}
stack[pointer++] = value;
return value;
}
public void popSilently() {
stack[--pointer] = null;
}
public Object pop() {
final Object result = stack[--pointer];
stack[pointer] = null;
return result;
}
public Object peek() {
return pointer == 0 ? null : stack[pointer - 1];
}
public int size() {
return pointer;
}
public boolean hasStuff() {
return pointer > 0;
}
public Object get(int i) {
return stack[i];
}
private void resizeStack(int newCapacity) {
Object[] newStack = new Object[newCapacity];
System.arraycopy(stack, 0, newStack, 0, Math.min(pointer, newCapacity));
stack = newStack;
}
public String toString() {
StringBuffer result = new StringBuffer("[");
for (int i = 0; i < pointer; i++) {
if (i > 0) {
result.append(", ");
}
result.append(stack[i]);
}
result.append(']');
return result.toString();
}
}
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