/*
 * Copyright (c) 2004, 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
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 */

package sun.jvmstat.monitor;

import sun.management.counter.Units;
import sun.management.counter.Variability;

/**
 * The base class for Instrumentation Monitoring Objects. This base class
 * provides implementations of the {@link Monitor} methods that are common
 * to all classes implementing the Monitor interface..
 *
 * @author Brian Doherty
 * @since 1.5
 */
public abstract class AbstractMonitor implements Monitor  {
    protected String name;
    protected Units units;
    protected Variability variability;
    protected int vectorLength;
    protected boolean supported;

    /**
     * Create a vector instrumentation monitoring object with the given
     * name and attributes.
     *
     * @param name the name to assign to this instrumentation object.
     * @param units the units of measure attribute
     * @param variability the variability attribute
     * @param supported support level indicator
     * @param vectorLength the length of the vector, or 0 if not a vector type.
     */
    protected AbstractMonitor(String name, Units units, Variability variability,
                              boolean supported, int vectorLength) {
        this.name = name;
        this.units = units;
        this.variability = variability;
        this.vectorLength = vectorLength;
        this.supported = supported;
    }

    /**
     * Create a scalar instrumentation monitoring object with the given
     * name and attributes.
     *
     * @param name the name to assign to this instrumentation object.
     * @param units the units of measure attribute
     * @param variability the variability attribute
     * @param supported support level indicator
     */
    protected AbstractMonitor(String name, Units units, Variability variability,
                              boolean supported) {
        this(name, units, variability, supported, 0);
    }

    /**
     * {@inheritDoc}
     */
    public String getName() {
        return name;
    }

    /**
     * {@inheritDoc}
     */
    public String getBaseName() {
        int baseIndex = name.lastIndexOf(".")+1;
        return name.substring(baseIndex);
    }

    /**
     * {@inheritDoc}
     */
    public Units getUnits() {
        return units;
    }

    /**
     * {@inheritDoc}
     */
    public Variability getVariability() {
        return variability;
    }

    /**
     * {@inheritDoc}
     */
    public boolean isVector() {
        return vectorLength > 0;
    }

    /**
     * {@inheritDoc}
     */
    public int getVectorLength() {
        return vectorLength;
    }

    /**
     * {@inheritDoc}
     */
    public boolean isSupported() {
        return supported;
    }

    /**
     * {@inheritDoc}
     */
    public abstract Object getValue();
}