/*
* Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* 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.
*
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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;
}
}