Trail: Reduce initial size and grow exponentially
Don't use exceptions for control flow.
Change-Id: Ie75a1b647b27be29aed18f0d6a11ef3e6678fd9b
diff --git a/src/lang/Trail.java b/src/lang/Trail.java
index 83937a9..e354650 100644
--- a/src/lang/Trail.java
+++ b/src/lang/Trail.java
@@ -22,7 +22,7 @@
/** Constructs a new trail stack. */
public Trail() {
- this(20000);
+ this(100);
}
/** Constructs a new trail stack with the given size. */
@@ -38,15 +38,13 @@
/** Pushes an entry to this <code>Trail</code>. */
public void push(Undoable t) {
- try {
- buffer[++top] = t;
- } catch (ArrayIndexOutOfBoundsException e) {
+ if (++top >= buffer.length) {
int len = buffer.length;
- Undoable[] new_buffer = new Undoable[len+20000];
+ Undoable[] new_buffer = new Undoable[2 * len];
System.arraycopy(buffer, 0, new_buffer, 0, len);
buffer = new_buffer;
- buffer[top] = t;
}
+ buffer[top] = t;
}
/** Pops an entry from this <code>Trail</code>. */
