/**
* Insert the given {@code Provider} at the specified {@code position}. The positions define the
* preference order in which providers are searched for requested algorithms.
*
* @param provider the provider to insert.
* @param position the position (starting from 1).
* @return the actual position or {@code -1} if the given {@code provider} was already in the
* list. The actual position may be different from the desired position.
*/
public static synchronized int insertProviderAt(Provider provider, int position) {
// check that provider is not already
// installed, else return -1; if (position <1) or (position > max
// position) position = max position + 1; insert provider, shift up
// one position for next providers; Note: The position is 1-based
if (getProvider(provider.getName()) != null) {
return -1;
}
int result = Services.insertProviderAt(provider, position);
renumProviders();
return result;
}
/**
* Removes the {@code Provider} with the specified name form the collection of providers. If the
* the {@code Provider} with the specified name is removed, all provider at a greater position are
* shifted down one position.
*
* <p>Returns silently if {@code name} is {@code null} or no provider with the specified name is
* installed.
*
* @param name the name of the provider to remove.
*/
public static synchronized void removeProvider(String name) {
// It is not clear from spec.:
// 1. if name is null, should we checkSecurityAccess or not?
// throw SecurityException or not?
// 2. as 1 but provider is not installed
// 3. behavior if name is empty string?
Provider p;
if ((name == null) || (name.length() == 0)) {
return;
}
p = getProvider(name);
if (p == null) {
return;
}
Services.removeProvider(p.getProviderNumber());
renumProviders();
p.setProviderNumber(-1);
}
// Access to Security.renumProviders()
public void renumProviders() {
Security.renumProviders();
}
