1/* 2 * Copyright (c) 2003, 2006, 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 26package sun.management.counter.perf; 27 28import sun.management.counter.*; 29import java.nio.ByteBuffer; 30import java.nio.ReadOnlyBufferException; 31import java.nio.charset.Charset; 32 33public class PerfStringCounter extends PerfByteArrayCounter 34 implements StringCounter { 35 36 private static Charset defaultCharset = Charset.defaultCharset(); 37 PerfStringCounter(String name, Variability v, 38 int flags, ByteBuffer bb) { 39 this(name, v, flags, bb.limit(), bb); 40 } 41 42 PerfStringCounter(String name, Variability v, int flags, 43 int maxLength, ByteBuffer bb) { 44 45 super(name, Units.STRING, v, flags, maxLength, bb); 46 } 47 48 // override isVector and getVectorLength in ByteArrayCounter 49 public boolean isVector() { 50 return false; 51 } 52 53 public int getVectorLength() { 54 return 0; 55 } 56 57 public Object getValue() { 58 return stringValue(); 59 } 60 61 public String stringValue() { 62 63 String str = ""; 64 byte[] b = byteArrayValue(); 65 66 if (b == null || b.length <= 1) { 67 return str; 68 } 69 70 int i; 71 for (i = 0; i < b.length && b[i] != (byte)0; i++); 72 73 // convert byte array to string, using all bytes up to, but 74 // not including the first null byte. 75 return new String(b , 0, i, defaultCharset); 76 } 77 78 /** 79 * Serialize as a snapshot object. 80 */ 81 protected Object writeReplace() throws java.io.ObjectStreamException { 82 return new StringCounterSnapshot(getName(), 83 getUnits(), 84 getVariability(), 85 getFlags(), 86 stringValue()); 87 } 88 89 private static final long serialVersionUID = 6802913433363692452L; 90} 91