@Override
	public String toString() {
		StringBuilder buf = new StringBuilder();
		buf.append(getClass().getSimpleName());
		buf.append(": event = ");
		buf.append(eventType);
		if (oldValue != null) {
			buf.append(", old = ");
			buf.append(oldValue);
		}
		if (newValue != null) {
			buf.append(", new = ");
			buf.append(newValue);
		}
		return buf.toString();
	}
Return the new value for this event or null if not applicable.

@return the old value or null if not applicable for this event.
Ghidra/Framework/Project/src/main/java/ghidra/framework/model/DomainObjectChangeRecord.java