/* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. * */ package org.apache.vysper.xmpp.modules.roster; /** * see http://www.xmpp.org/internet-drafts/draft-saintandre-rfc3921bis-05.html#roster-syntax-subscription * "none" -- the user does not have a subscription to the contact's presence, and the contact does * not have a subscription to the user's presence * "to" -- the user has a subscription to the contact's presence, but the contact does not have a * subscription to the user's presence * "from" -- the contact has a subscription to the user's presence, but the user does not have a * subscription to the contact's presence * "both" -- both the user and the contact have subscriptions to each other's presence (also called * a "mutual subscription") * * remove is a special case: * In a roster set, the value of the 'subscription' attribute MAY be "remove", which indicates that the item is to be * removed from the roster; a receiving server MUST ignore all values of the 'subscription' attribute other than "remove". * * @author The Apache MINA Project (dev@mina.apache.org) */ public enum SubscriptionType { BOTH("both"), FROM("from"), NONE("none"), REMOVE("remove"), TO("to"); private final String value; SubscriptionType(String value) { this.value = value; } public String value() { return value; } public boolean includesFrom() { return this == FROM || this == BOTH; } public boolean includesTo() { return this == TO || this == BOTH; } public boolean acceptsTo() { return this == NONE || this == FROM; } public boolean acceptsFrom() { return this == NONE || this == TO; } public static SubscriptionType addState(SubscriptionType old, SubscriptionType add) { switch (add) { case BOTH: throw new RuntimeException("add 'both' not valid"); case FROM: if (!old.acceptsFrom()) throw new RuntimeException("cannot add " + add.value() + " to " + old.value()); if (old == NONE) return FROM; if (old == TO) return BOTH; throw new RuntimeException("add FROM not supported for " + old.value()); case NONE: return add; case REMOVE: throw new RuntimeException("add 'remove' not valid"); case TO: if (!old.acceptsTo()) throw new RuntimeException("cannot add " + add.value() + " to " + old.value()); if (old == NONE) return TO; if (old == FROM) return BOTH; throw new RuntimeException("add TO not supported for " + old.value()); default: throw new RuntimeException("not implemented: adding " + add.value()); } } }