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	/*
	* Copyright (c) 1997, 2008, 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.
	*/


	/*
	* 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>");
	}
	}

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