001 /** 002 * hammurapi-rules @mesopotamia.version@ 003 * Hammurapi rules engine. 004 * Copyright (C) 2005 Hammurapi Group 005 * 006 * This program is free software; you can redistribute it and/or 007 * modify it under the terms of the GNU Lesser General Public 008 * License as published by the Free Software Foundation; either 009 * version 2 of the License, or (at your option) any later version. 010 * 011 * This program is distributed in the hope that it will be useful, 012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 * Lesser General Public License for more details. 015 * 016 * You should have received a copy of the GNU Lesser General Public 017 * License along with this library; if not, write to the Free Software 018 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 019 * 020 * URL: http://http://www.hammurapi.biz 021 * e-Mail: support@hammurapi.biz 022 */ 023 package biz.hammurapi.rules; 024 025 import java.util.Collection; 026 027 import javax.rules.Handle; 028 029 /** 030 * Handle manager - creates and maintains handle -> object 031 * mappings. 032 * @author Pavel Vlasov 033 * @version ${Revision} 034 */ 035 public interface HandleManager extends Negatable { 036 037 /** 038 * Establishes Handle -> Object mapping. 039 * @param object 040 * @return 041 */ 042 Handle addObject(Object object); 043 044 /** 045 * Retrieves object by handle 046 * @param handle 047 * @return 048 */ 049 Object getObject(Handle handle); 050 051 /** 052 * @return All objects with handles. 053 */ 054 Collection getObjects(); 055 056 /** 057 * @return All handles. 058 */ 059 Collection getHandles(); 060 061 /** 062 * Removes object entry by key. 063 * @param handle 064 */ 065 void remove(Handle handle); 066 067 /** 068 * Removes object entry by value; 069 * @param obj 070 */ 071 void remove(Object obj); 072 073 /** 074 * @param handle 075 * @return True there is a mapping with given handle in the manager. 076 */ 077 boolean contains(Handle handle); 078 079 /** 080 * Rebinds handle to another object 081 * @param handle 082 * @param object 083 */ 084 void rebind(Handle handle, Object object); 085 086 /** 087 * Removes all mappings. 088 */ 089 void clear(); 090 }