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/**
 * @test
 * @bug 4963416 7054918
 * @library /test/lib
 * @summary make sure removeProvider() always works correctly
 * @author Andreas Sterbenz
 */

import java.util.*;

import java.security.*;
import jdk.test.lib.security.ProvidersSnapshot;

public class RemoveProviders {

    public static void main(String[] args) throws Exception {
        ProvidersSnapshot snapshot = ProvidersSnapshot.create();
        try {
            main0(args);
        } finally {
            snapshot.restore();
        }
    }

    public static void main0(String[] args) throws Exception {
        Provider[] providers = Security.getProviders();
        System.out.println("Providers: " + Arrays.asList(providers));

        // remove each provider and add it back in at the end of the list
        for (int i = 0; i < providers.length; i++) {
            Provider p = providers[i];
            String name = p.getName();
            Security.removeProvider(name);
            if (Security.getProvider(name) != null) {
                throw new Exception("Provider not removed: " + name);
            }
            Security.addProvider(p);
        }
        if (Arrays.equals(providers, Security.getProviders()) == false) {
            throw new Exception("Provider mismatch: " + Arrays.asList(Security.getProviders()));
        }

        // remove non-existing provider
        Security.removeProvider("foo");
        if (Arrays.equals(providers, Security.getProviders()) == false) {
            throw new Exception("Provider mismatch: " + Arrays.asList(Security.getProviders()));
        }

        // remove from the middle of the list
        Security.removeProvider("SunJCE");
        if (Security.getProvider("SunJCE") != null) {
            throw new Exception("not removed");
        }

        System.out.println("Done.");
    }

}