/*

 * 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.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

/*

 * The Original Code is HAT. The Initial Developer of the

 * Original Code is Bill Foote, with contributions from others

 * at JavaSoft/Sun.

 */

package com.sun.tools.hat.internal.server;

import com.sun.tools.hat.internal.model.*;

import java.util.*;

public class FinalizerSummaryQuery extends QueryHandler {

    public void run() {

        Enumeration objs = snapshot.getFinalizerObjects();

        startHtml("Finalizer Summary");

        out.println("<p align='center'>");

        out.println("<b><a href='/'>All Classes (excluding platform)</a></b>");

        out.println("</p>");

        printFinalizerSummary(objs);

        endHtml();

    }

    private static class HistogramElement {

        public HistogramElement(JavaClass clazz) {

            this.clazz = clazz;

        }

        public void updateCount() {

            this.count++;

        }

        public int compare(HistogramElement other) {

            long diff = other.count - count;

            return (diff == 0L)? 0 : ((diff > 0L)? +1 : -1);

        }

        public JavaClass getClazz() {

            return clazz;

        }

        public long getCount() {

            return count;

        }

        private JavaClass clazz;

        private long count;

    }

    private void printFinalizerSummary(Enumeration objs) {

        int count = 0;

        Map<JavaClass, HistogramElement> map = new HashMap<JavaClass, HistogramElement>();

        while (objs.hasMoreElements()) {

            JavaHeapObject obj = (JavaHeapObject) objs.nextElement();

            count++;

            JavaClass clazz = obj.getClazz();

            if (! map.containsKey(clazz)) {

                map.put(clazz, new HistogramElement(clazz));

            }

            HistogramElement element = map.get(clazz);

            element.updateCount();

        }

        out.println("<p align='center'>");

        out.println("<b>");

        out.println("Total ");

        if (count != 0) {

            out.print("<a href='/finalizerObjects/'>instances</a>");

        } else {

            out.print("instances");

        }

        out.println(" pending finalization: ");

        out.print(count);

        out.println("</b></p><hr>");

        if (count == 0) {

            return;

        }

        // calculate and print histogram

        HistogramElement[] elements = new HistogramElement[map.size()];

        map.values().toArray(elements);

        Arrays.sort(elements, new Comparator<HistogramElement>() {

                    public int compare(HistogramElement o1, HistogramElement o2) {

                        return o1.compare(o2);

                    }

                });

        out.println("<table border=1 align=center>");

        out.println("<tr><th>Count</th><th>Class</th></tr>");

        for (int j = 0; j < elements.length; j++) {

            out.println("<tr><td>");

            out.println(elements[j].getCount());

            out.println("</td><td>");

            printClass(elements[j].getClazz());

            out.println("</td><tr>");

        }

        out.println("</table>");

    }

}