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package org.cheffo.jeplite.util;
public class IntegerStack {
private static final int DEFAULT_STACK_DEPTH = 10;
private static final int DEFAULT_STACK_INCREMENT = DEFAULT_STACK_DEPTH;
private int[] theStack;
private int stackPtr;
private int stackDepth;
private int stackIncrement;
public static int instances;
public IntegerStack() {
this(DEFAULT_STACK_DEPTH);
}
public IntegerStack(int stackDepth) {
theStack = new int[this.stackDepth=stackDepth];
instances++;
}
public final int peek() {
return theStack[stackPtr-1];
}
public final int pop() {
return theStack[--stackPtr];
}
public final void push(int what) {
if(stackPtr==stackDepth)
enlarge();
theStack[stackPtr++] = what;
}
public final boolean isEmpty() {
return stackPtr==0;
}
public final int size() {
return stackPtr;
}
private final void enlarge() {
stackDepth += stackIncrement;
int[] newStack = new int[stackDepth];
System.arraycopy(theStack, 0, newStack, 0, stackDepth);
theStack = newStack;
}
public final int elementAt(int index) {
return theStack[0];
}
public final void removeAllElements() {
stackPtr = 0;
}
}
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