| /* |
| * Copyright (c) 2003, 2006, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package sun.management.snmp.util; |
| |
| import com.sun.jmx.snmp.SnmpOid; |
| |
| import java.io.Serializable; |
| |
| import java.util.Comparator; |
| import java.util.Arrays; |
| import java.util.TreeMap; |
| import java.util.List; |
| import java.util.Iterator; |
| |
| import java.lang.ref.WeakReference; |
| |
| /** |
| * This class is used to cache table data. |
| **/ |
| public class SnmpCachedData implements SnmpTableHandler { |
| |
| /** |
| * Compares two SnmpOid. |
| **/ |
| public static final Comparator<SnmpOid> oidComparator = |
| new Comparator<SnmpOid>() { |
| public int compare(SnmpOid o1, SnmpOid o2) { |
| return o1.compareTo(o2); |
| } |
| public boolean equals(Object o1, Object o2) { |
| if (o1 == o2) return true; |
| else return o1.equals(o2); |
| } |
| }; |
| |
| /** |
| * Constructs a new instance of SnmpCachedData. Instances are |
| * immutable. |
| * @param lastUpdated Time stamp as returned by |
| * {@link System#currentTimeMillis System.currentTimeMillis()} |
| * @param indexes The table entry indexes, sorted in ascending order. |
| * @param datas The table datas, sorted according to the |
| * order in <code>indexes</code>: <code>datas[i]</code> |
| * is the data that corresponds to |
| * <code>indexes[i]</code> |
| **/ |
| public SnmpCachedData(long lastUpdated, SnmpOid indexes[], |
| Object datas[]) { |
| this.lastUpdated = lastUpdated; |
| this.indexes = indexes; |
| this.datas = datas; |
| } |
| |
| /** |
| * Constructs a new instance of SnmpCachedData. Instances are |
| * immutable. |
| * @param lastUpdated Time stamp as returned by |
| * {@link System#currentTimeMillis System.currentTimeMillis()} |
| * @param indexMap The table indexed table data, sorted in ascending |
| * order by {@link #oidComparator}. The keys must be |
| * instances of {@link SnmpOid}. |
| **/ |
| public SnmpCachedData(long lastUpdated, TreeMap<SnmpOid, Object> indexMap) { |
| this(lastUpdated, indexMap, true); |
| } |
| /** |
| * Constructs a new instance of SnmpCachedData. Instances are |
| * immutable. |
| * @param lastUpdated Time stamp as returned by |
| * {@link System#currentTimeMillis System.currentTimeMillis()} |
| * @param indexMap The table indexed table data, sorted in ascending |
| * order by {@link #oidComparator}. The keys must be |
| * instances of {@link SnmpOid}. |
| **/ |
| public SnmpCachedData(long lastUpdated, TreeMap<SnmpOid, Object> indexMap, |
| boolean b) { |
| |
| final int size = indexMap.size(); |
| this.lastUpdated = lastUpdated; |
| this.indexes = new SnmpOid[size]; |
| this.datas = new Object[size]; |
| |
| if(b) { |
| indexMap.keySet().toArray(this.indexes); |
| indexMap.values().toArray(this.datas); |
| } else |
| indexMap.values().toArray(this.datas); |
| } |
| |
| /** |
| * Time stamp as returned by |
| * {@link System#currentTimeMillis System.currentTimeMillis()} |
| **/ |
| public final long lastUpdated; |
| |
| /** |
| * The table entry indexes, sorted in ascending order. |
| **/ |
| public final SnmpOid indexes[]; |
| |
| /** |
| * The table datas, sorted according to the |
| * order in <code>indexes</code>: <code>datas[i]</code> |
| * is the data that corresponds to <code>indexes[i]</code> |
| **/ |
| public final Object datas[]; |
| |
| /** |
| * The position of the given <var>index</var>, as returned by |
| * <code>java.util.Arrays.binarySearch()</code> |
| **/ |
| public final int find(SnmpOid index) { |
| return Arrays.binarySearch(indexes,index,oidComparator); |
| } |
| |
| // SnmpTableHandler.getData() |
| public Object getData(SnmpOid index) { |
| final int pos = find(index); |
| if ((pos < 0)||(pos >= datas.length)) return null; |
| return datas[pos]; |
| } |
| |
| // SnmpTableHandler.getNext() |
| public SnmpOid getNext(SnmpOid index) { |
| if (index == null) { |
| if (indexes.length>0) return indexes[0]; |
| else return null; |
| } |
| final int pos = find(index); |
| if (pos > -1) { |
| if (pos < (indexes.length -1) ) return indexes[pos+1]; |
| else return null; |
| } |
| final int insertion = -pos -1; |
| if ((insertion > -1) && (insertion < indexes.length)) |
| return indexes[insertion]; |
| else return null; |
| } |
| |
| // SnmpTableHandler.contains() |
| public boolean contains(SnmpOid index) { |
| final int pos = find(index); |
| return ((pos > -1)&&(pos < indexes.length)); |
| } |
| |
| } |