/*

 * 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.counter.perf;

import sun.management.counter.*;

import java.nio.ByteBuffer;

import java.nio.ReadOnlyBufferException;

import java.nio.charset.Charset;

public class PerfStringCounter extends PerfByteArrayCounter

    implements StringCounter {

    private static Charset defaultCharset = Charset.defaultCharset();

    PerfStringCounter(String name, Variability v,

                      int flags, ByteBuffer bb) {

        this(name, v, flags, bb.limit(), bb);

    }

    PerfStringCounter(String name, Variability v, int flags,

                      int maxLength, ByteBuffer bb) {

        super(name, Units.STRING, v, flags, maxLength, bb);

    }

    // override isVector and getVectorLength in ByteArrayCounter

    public boolean isVector() {

        return false;

    }

    public int getVectorLength() {

        return 0;

    }

    public Object getValue() {

        return stringValue();

    }

    public String stringValue() {

        String str = "";

        byte[] b = byteArrayValue();

        if (b == null || b.length <= 1) {

            return str;

        }

        int i;

        for (i = 0; i < b.length && b[i] != (byte)0; i++);

        // convert byte array to string, using all bytes up to, but

        // not including the first null byte.

        return new String(b , 0, i, defaultCharset);

    }

    /**

     * Serialize as a snapshot object.

     */

    protected Object writeReplace() throws java.io.ObjectStreamException {

        return new StringCounterSnapshot(getName(),

                                         getUnits(),

                                         getVariability(),

                                         getFlags(),

                                         stringValue());

    }

    private static final long serialVersionUID = 6802913433363692452L;

}