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annotate 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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3733
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1 /*
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2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.sun.max.collect;
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24
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25 /**
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26 * A sequence of {@linkplain PoolObject objects} that are uniquely identified <i>within a sequence</i> by a
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27 * {@linkplain PoolObject#serial() serial number} (i.e. an index into the sequence). A subset of the objects
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28 * within a pool can be efficiently represented by a {@link PoolSet}.
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29 */
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30 public abstract class Pool<T extends PoolObject> implements Iterable<T> {
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31
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32 /**
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33 * Gets the object in the pool identified by a given serial number.
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34 */
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35 public abstract T get(int serial);
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36
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37 /**
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38 * The number of objects in this pool. All objects in the pool must have a unique serial number in the range
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39 * {@code [0 .. length() - 1]}.
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40 */
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41 public abstract int length();
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42
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43 /**
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44 * Determines if this pool is empty.
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45 */
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46 public boolean isEmpty() {
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47 return length() == 0;
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48 }
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49 }