| /* |
| * Copyright (c) 2004, 2010, 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.jvmstat.perfdata.monitor; |
| |
| import sun.jvmstat.monitor.*; |
| import java.nio.ByteBuffer; |
| import java.nio.charset.Charset; |
| |
| /** |
| * Class for monitoring a PerfData String instrument. |
| * |
| * @author Brian Doherty |
| * @since 1.5 |
| */ |
| public class PerfStringMonitor extends PerfByteArrayMonitor |
| implements StringMonitor { |
| |
| private static Charset defaultCharset = Charset.defaultCharset(); |
| |
| /** |
| * Constructor to create a StringMonitor object for the string instrument |
| * represented by the data in the given buffer. |
| * |
| * @param name the name of the string instrument |
| * @param v the variability attribute |
| * @param supported support level indicator |
| * @param bb the buffer containing the string instrument data. |
| */ |
| public PerfStringMonitor(String name, Variability v, boolean supported, |
| ByteBuffer bb) { |
| this(name, v, supported, bb, bb.limit()); |
| } |
| |
| /** |
| * Constructor to create a StringMonitor object for the string instrument |
| * represented by the data in the given buffer. |
| * |
| * @param name the name of the string instrument |
| * @param v the variability attribute |
| * @param supported support level indicator |
| * @param bb the buffer containing the string instrument data. |
| * @param maxLength the maximum length of the string data. |
| */ |
| public PerfStringMonitor(String name, Variability v, boolean supported, |
| ByteBuffer bb, int maxLength) { |
| super(name, Units.STRING, v, supported, bb, maxLength); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * The object returned contains a String with a copy of the current |
| * value of the StringInstrument. |
| * |
| * @return Object - a copy of the current value of the StringInstrument. |
| * The return value is guaranteed to be of type String. |
| */ |
| public Object getValue() { |
| return stringValue(); |
| } |
| |
| /** |
| * Return the current value of the StringInstrument as a String. |
| * |
| * @return String - a copy of the current value of the StringInstrument. |
| */ |
| public String stringValue() { |
| String str = ""; |
| byte[] b = byteArrayValue(); |
| |
| // catch null strings |
| if ((b == null) || (b.length <= 1) || (b[0] == (byte)0)) { |
| return str; |
| } |
| |
| int i; |
| for (i = 0; i < b.length && b[i] != (byte)0; i++); |
| |
| return new String(b, 0, i, defaultCharset); |
| } |
| } |