| /* |
| * 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()); |
| |
| } |
| } |
| |
| } |