public Enumeration getAttributeNamesInScope(int scope) {
Set keys;
switch (scope) {
case PAGE_SCOPE:
keys = pageScopeMap.keySet();
break;
case APPLICATION_SCOPE:
return appCtx.getAttributeNames();
default:
throw new IllegalArgumentException("invalid scope: " + scope);
}
final String[] array = (String[]) keys.toArray(new String[keys.size()]);
return new Enumeration() {
private int next = 0;
public boolean hasMoreElements() {
if (next >= array.length) {
return false;
} else {
return true;
}
}
public Object nextElement() throws NoSuchElementException {
if (!hasMoreElements()) {
throw new NoSuchElementException("no more elements.");
}
return array[next++];
}
};
}
public Object getAttribute(String name, int scope) {
switch (scope) {
case PAGE_SCOPE:
return pageScopeMap.get(name);
case APPLICATION_SCOPE:
return appCtx.getAttribute(name);
default:
throw new IllegalArgumentException("invalid scope: " + scope);
}
}
public void removeAttribute(String name, int scope) {
switch (scope) {
case PAGE_SCOPE:
pageScopeMap.remove(name);
break;
case APPLICATION_SCOPE:
appCtx.removeAttribute(name);
break;
default:
throw new IllegalArgumentException("invalid scope: " + scope);
}
}
public void setAttribute(String name, Object obj, int scope) {
if (null == obj) {
removeAttribute(name, scope);
} else {
switch (scope) {
case PAGE_SCOPE:
pageScopeMap.put(name, obj);
break;
case APPLICATION_SCOPE:
appCtx.setAttribute(name, obj);
break;
default:
throw new IllegalArgumentException("invalid scope: " + scope);
}
}
}