/**
* Factory method, equivalent to a "fromXML" for step creation. Looks for a class with the same
* name as the XML tag, with the first letter capitalized. For example, <call /> is
* abbot.script.Call.
*/
public static Step createStep(Resolver resolver, Element el) throws InvalidScriptException {
String tag = el.getName();
Map attributes = createAttributeMap(el);
String name = tag.substring(0, 1).toUpperCase() + tag.substring(1);
if (tag.equals(TAG_WAIT)) {
attributes.put(TAG_WAIT, "true");
name = "Assert";
}
try {
name = "abbot.script." + name;
Log.debug("Instantiating " + name);
Class cls = Class.forName(name);
try {
// Steps with contents require access to the XML element
Class[] argTypes = new Class[] {Resolver.class, Element.class, Map.class};
Constructor ctor = cls.getConstructor(argTypes);
return (Step) ctor.newInstance(new Object[] {resolver, el, attributes});
} catch (NoSuchMethodException nsm) {
// All steps must support this ctor
Class[] argTypes = new Class[] {Resolver.class, Map.class};
Constructor ctor = cls.getConstructor(argTypes);
return (Step) ctor.newInstance(new Object[] {resolver, attributes});
}
} catch (ClassNotFoundException cnf) {
String msg = Strings.get("step.unknown_tag", new Object[] {tag});
throw new InvalidScriptException(msg);
} catch (InvocationTargetException ite) {
Log.warn(ite);
throw new InvalidScriptException(ite.getTargetException().getMessage());
} catch (Exception exc) {
Log.warn(exc);
throw new InvalidScriptException(exc.getMessage());
}
}
/** Convert the attributes in the given XML Element into a Map of name/value pairs. */
protected static Map createAttributeMap(Element el) {
Log.debug("Creating attribute map for " + el);
Map attributes = new HashMap();
Iterator iter = el.getAttributes().iterator();
while (iter.hasNext()) {
Attribute att = (Attribute) iter.next();
attributes.put(att.getName(), att.getValue());
}
return attributes;
}
/** Add an attribute to the given XML Element. Attributes are kept in alphabetical order. */
protected Element addAttributes(Element el) {
// Use a TreeMap to keep the attributes sorted on output
Map atts = new TreeMap(getAttributes());
Iterator iter = atts.keySet().iterator();
while (iter.hasNext()) {
String key = (String) iter.next();
String value = (String) atts.get(key);
if (value == null) {
Log.warn("Attribute '" + key + "' value was null in step " + getXMLTag());
value = "";
}
el.setAttribute(key, value);
}
return el;
}