1 /* 2 * Copyright (c) 1996, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 #ifndef CMDIDLIST_H 27 #define CMDIDLIST_H 28 29 #include "awt.h" 30 #include "awt_Object.h" 31 32 // Mapping from command ids to objects. 33 class AwtCmdIDList { 34 public: 35 AwtCmdIDList(); 36 ~AwtCmdIDList(); 37 38 UINT Add(AwtObject* obj); 39 AwtObject* Lookup(UINT id); 40 void Remove(UINT id); 41 jboolean isFreeIDAvailable(); 42 43 CriticalSection m_lock; 44 45 private: 46 47 // next_free_index is used to build a list of free ids. Since the 48 // array index is less then 32k, we can't confuse in-use entry 49 // (pointer) with an index of the next free entry. NIL is -1. 50 union CmdIDEntry { 51 int next_free_index; // index of the next entry in the free list 52 AwtObject *obj; // object that is assigned this id 53 }; 54 55 CmdIDEntry *m_array; // the vector's contents 56 57 int m_first_free; // head of the free list, may be -1 (nil) 58 UINT m_capacity; // size of currently allocated m_array 59 60 void BuildFreeList(UINT first_index); 61 }; 62 63 64 #endif // CMDIDLIST_H