Java Provider.getProperty方法代碼示例

import java.security.Provider; //導入方法依賴的package包/類
/**
 * Helper routine that uses a preferences entry to obtain an
 * implementation of a MechanismFactory from it.
 * @param e the preferences entry that contains the provider and
 * either a null of an explicit oid that matched the oid of the
 * desired mechanism.
 * @param mechOid the oid of the desired mechanism
 * @throws GSSException If the application explicitly requested
 * this entry's provider to be used for the desired mechanism but
 * some problem is encountered
 */
private MechanismFactory getMechFactory(PreferencesEntry e, Oid mechOid)
    throws GSSException {
    Provider p = e.getProvider();

    /*
     * See if a MechanismFactory was previously instantiated for
     * this provider and mechanism combination.
     */
    PreferencesEntry searchEntry = new PreferencesEntry(p, mechOid);
    MechanismFactory retVal = factories.get(searchEntry);
    if (retVal == null) {
        /*
         * Apparently not. Now try to instantiate this class from
         * the provider.
         */
        String prop = PROV_PROP_PREFIX + mechOid.toString();
        String className = p.getProperty(prop);
        if (className != null) {
            retVal = getMechFactoryImpl(p, className, mechOid, caller);
            factories.put(searchEntry, retVal);
        } else {
            /*
             * This provider does not support this mechanism.
             * If the application explicitly requested that
             * this provider be used for this mechanism, then
             * throw an exception
             */
            if (e.getOid() != null) {
                throw new GSSExceptionImpl(GSSException.BAD_MECH,
                     "Provider " + p.getName() +
                     " does not support mechanism " + mechOid);
            }
        }
    }
    return retVal;
}
 

import java.security.Provider; //導入方法依賴的package包/類
synchronized public void addProviderAtFront(Provider p, Oid mechOid)
    throws GSSException {

    PreferencesEntry newEntry = new PreferencesEntry(p, mechOid);
    PreferencesEntry oldEntry;
    boolean foundSomeMech;

    Iterator<PreferencesEntry> list = preferences.iterator();
    while (list.hasNext()) {
        oldEntry = list.next();
        if (newEntry.implies(oldEntry))
            list.remove();
    }

    if (mechOid == null) {
        foundSomeMech = addAllMechsFromProvider(p);
    } else {
        String oidStr = mechOid.toString();
        if (p.getProperty(PROV_PROP_PREFIX + oidStr) == null)
            throw new GSSExceptionImpl(GSSException.BAD_MECH,
                                       "Provider " + p.getName()
                                       + " does not support "
                                       + oidStr);
        mechs.add(mechOid);
        foundSomeMech = true;
    }

    if (foundSomeMech) {
        preferences.add(0, newEntry);
    }
}
 

import java.security.Provider; //導入方法依賴的package包/類
synchronized public void addProviderAtEnd(Provider p, Oid mechOid)
    throws GSSException {

    PreferencesEntry newEntry = new PreferencesEntry(p, mechOid);
    PreferencesEntry oldEntry;
    boolean foundSomeMech;

    Iterator<PreferencesEntry> list = preferences.iterator();
    while (list.hasNext()) {
        oldEntry = list.next();
        if (oldEntry.implies(newEntry))
            return;
    }

    // System.out.println("addProviderAtEnd: No it is not redundant");

    if (mechOid == null)
        foundSomeMech = addAllMechsFromProvider(p);
    else {
        String oidStr = mechOid.toString();
        if (p.getProperty(PROV_PROP_PREFIX + oidStr) == null)
            throw new GSSExceptionImpl(GSSException.BAD_MECH,
                                   "Provider " + p.getName()
                                   + " does not support "
                                   + oidStr);
        mechs.add(mechOid);
        foundSomeMech = true;
    }

    if (foundSomeMech) {
        preferences.add(newEntry);
    }
}