/*

 * 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package sun.tools.jstat;

import java.util.*;

import java.net.*;

import java.io.*;

/**

 * A class for finding a specific special option in the jstat_options file.

 *

 * @author Brian Doherty

 * @since 1.5

 */

public class OptionFinder {

    private static final boolean debug = false;

    List<URL> optionsSources;

    public OptionFinder(List<URL> optionsSources) {

        this.optionsSources = optionsSources;

    }

    public OptionFormat getOptionFormat(String option, boolean useTimestamp) {

        OptionFormat of = getOptionFormat(option, optionsSources);

        OptionFormat tof = null;

        if ((of != null) && (useTimestamp)) {

            // prepend the timestamp column as first column

            tof = getOptionFormat("timestamp", optionsSources);

            if (tof != null) {

                ColumnFormat cf = (ColumnFormat)tof.getSubFormat(0);

                of.insertSubFormat(0, cf);

            }

        }

        return of;

    }

    protected OptionFormat getOptionFormat(String option, List<URL> sources) {

        OptionFormat of = null;

        for (URL u : sources) {

            try {

                Reader r = new BufferedReader(

                        new InputStreamReader(u.openStream()));

                of = new Parser(r).parse(option);

                if (of != null)

                    break;

            } catch (IOException e) {

                if (debug) {

                    System.err.println("Error processing " + u

                                       + " : " + 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");

            }

        }

        return of;

    }

}