/*

 * 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

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package sun.tools.jstat;

import java.util.*;

import java.net.*;

import java.io.*;

/**

 * A class for listing the available options in the jstat_options file.

 *

 * @author Brian Doherty

 * @since 1.5

 */

public class OptionLister {

    private static final boolean debug = false;

    private List<URL> sources;

    public OptionLister(List<URL> sources) {

        this.sources = sources;

    }

    public void print(PrintStream ps) {

        Comparator<OptionFormat> c = new Comparator<OptionFormat>() {

               public int compare(OptionFormat o1, OptionFormat o2) {

                   OptionFormat of1 = o1;

                   OptionFormat of2 = o2;

                   return (of1.getName().compareTo(of2.getName()));

               }

        };

        Set<OptionFormat> options = new TreeSet<OptionFormat>(c);

        for (URL u : sources) {

            try {

                Reader r = new BufferedReader(

                        new InputStreamReader(u.openStream()));

                Set<OptionFormat> s = new Parser(r).parseOptions();

                options.addAll(s);

            } catch (IOException e) {

                if (debug) {

                    System.err.println(e.getMessage());

                    e.printStackTrace();

                }

            } catch (ParserException e) {

                // Exception in parsing the options file.

                System.err.println(u + ": " + e.getMessage());

                System.err.println("Parsing of " + u + " aborted");

            }

        }

        for ( OptionFormat of : options) {

            if (of.getName().compareTo("timestamp") == 0) {

              // ignore the special timestamp OptionFormat.

              continue;

            }

            ps.println("-" + of.getName());

        }

    }

}