Debug.java

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/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

package org.openoffice.xmerge.util;

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.FileWriter;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.Writer;
import java.util.Properties;

public final class Debug {

    public static final int INFO = 0x0001;
    public static final int ERROR = 0x0002;
    public static final int TRACE = 0x0004;

    private static final boolean SET = true;

    private static int flags = 0;
    private static PrintWriter writer = null;

    static {

        InputStream is = null;
        try {
            try {
                is = Debug.class.getResourceAsStream("Debug.properties");
                Properties props = new Properties();
                props.load(is);

                String info = props.getProperty("debug.info", "false");
                info = info.toLowerCase();

                if (info.equals("true")) {
                    setFlags(Debug.INFO, Debug.SET);
                }

                String trace = props.getProperty("debug.trace", "false");
                trace = trace.toLowerCase();

                if (trace.equals("true")) {
                    setFlags(Debug.TRACE, Debug.SET);
                }

                String error = props.getProperty("debug.error", "false");
                error = error.toLowerCase();

                if (error.equals("true")) {
                    setFlags(Debug.ERROR, Debug.SET);
                }

                String w = props.getProperty("debug.output", "System.out");
                setOutput(w);

            } finally {
                if (is !=null)
                    is.close();
            }
        } catch (Throwable ex) {
            ex.printStackTrace(System.err);
        }
    }

    private Debug() {
    }

    private static void setOutput(String str) {
        if (writer == null) {
            if (str.equals("System.out")) {
                setOutput(System.out);
            } else if (str.equals("System.err")) {
                setOutput(System.err);
            } else {
                try {
                    setOutput(new FileWriter(str));
                } catch (IOException e) {
                    e.printStackTrace(System.err);
                }
            }
        }
    }

    private static void setOutput(OutputStream stream) {
        setOutput(new OutputStreamWriter(stream));
    }

    private static void setOutput(Writer w) {
        if (writer != null) {
            writer.close();
        }
        writer = new PrintWriter(new BufferedWriter(w), true);
    }

    private static void setFlags(int f, boolean set) {
        if (set) {
            flags |= f;
        } else {
            flags &= ~f;
        }
    }

    public static boolean isFlagSet(int f) {
        return ((flags & f) != 0);
    }

    public static void log(int flag, String msg) {
        if (isFlagSet(flag) && writer != null) {
            writer.println(msg);
        }
    }

    public static void log(int flag, String msg, Throwable e) {
        if (isFlagSet(flag) && writer != null) {
            writer.println(msg);
            if (e != null)
                e.printStackTrace(writer);
        }
    }
}