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comparison graal/com.oracle.max.base/src/com/sun/max/collect/Pool.java @ 3733:e233f5660da4

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Added Java files from Maxine project.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sat, 17 Dec 2011 19:59:18 +0100
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3732:3e2e8b8abdaf 3733:e233f5660da4
1 /*
2 * Copyright (c) 2007, 2011, 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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package com.sun.max.collect;
24
25 /**
26 * A sequence of {@linkplain PoolObject objects} that are uniquely identified <i>within a sequence</i> by a
27 * {@linkplain PoolObject#serial() serial number} (i.e. an index into the sequence). A subset of the objects
28 * within a pool can be efficiently represented by a {@link PoolSet}.
29 */
30 public abstract class Pool<T extends PoolObject> implements Iterable<T> {
31
32 /**
33 * Gets the object in the pool identified by a given serial number.
34 */
35 public abstract T get(int serial);
36
37 /**
38 * The number of objects in this pool. All objects in the pool must have a unique serial number in the range
39 * {@code [0 .. length() - 1]}.
40 */
41 public abstract int length();
42
43 /**
44 * Determines if this pool is empty.
45 */
46 public boolean isEmpty() {
47 return length() == 0;
48 }
49 }