PortletPreferencesImpl.java 文件源码

/**
 * Resets or removes the value associated with the specified key.
 * <p/>
 * If this implementation supports stored defaults, and there is such
 * a default for the specified preference, the given key will be
 * reset to the stored default.
 * <p/>
 * If there is no default available the key will be removed.
 *
 * @param key to reset
 * @throws java.lang.IllegalArgumentException
 *          if key is <code>null</code>.
 * @throws javax.portlet.ReadOnlyException
 *          if this preference cannot be modified for this request
 */
public void reset(String key) throws ReadOnlyException {
    if (key == null) throw new IllegalArgumentException("key is NULL");
    PersistencePreferenceAttribute ppa = (PersistencePreferenceAttribute) attributes.get(key);
    if (ppa != null) {
        if (ppa.isReadOnly()) throw new ReadOnlyException("PortletPreference is read-only!");
        Preference defaultPref = (Preference) defaultPrefsMap.get(key);
        if (defaultPref != null) {
            Value[] defvals = defaultPref.getValue();
            String[] vals = new String[defvals.length];
            for (int i = 0; i < defvals.length; i++) {
                vals[i] = defvals[i].getContent();
            }
            ppa.setAValues(vals);
        } else {
            attributes.remove(key);
        }
    }
}