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      1 /**
      2  * $RCSfile$
      3  * $Revision$
      4  * $Date$
      5  *
      6  * Copyright 2003 Jive Software.
      7  *
      8  * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
      9  * you may not use this file except in compliance with the License.
     10  * You may obtain a copy of the License at
     11  *
     12  *     http://www.apache.org/licenses/LICENSE-2.0
     13  *
     14  * Unless required by applicable law or agreed to in writing, software
     15  * distributed under the License is distributed on an "AS IS" BASIS,
     16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     17  * See the License for the specific language governing permissions and
     18  * limitations under the License.
     19  */
     20 
     21 package org.jivesoftware.smack.filter;
     22 
     23 import org.jivesoftware.smack.packet.Packet;
     24 
     25 /**
     26  * Filters for packets where the "from" field contains a specified value.
     27  *
     28  * @author Matt Tucker
     29  */
     30 public class FromContainsFilter implements PacketFilter {
     31 
     32     private String from;
     33 
     34     /**
     35      * Creates a "from" contains filter using the "from" field part.
     36      *
     37      * @param from the from field value the packet must contain.
     38      */
     39     public FromContainsFilter(String from) {
     40         if (from == null) {
     41             throw new IllegalArgumentException("Parameter cannot be null.");
     42         }
     43         this.from = from.toLowerCase();
     44     }
     45 
     46     public boolean accept(Packet packet) {
     47         if (packet.getFrom() == null) {
     48             return false;
     49         }
     50         else {
     51             return packet.getFrom().toLowerCase().indexOf(from) != -1;
     52         }
     53     }
     54 }