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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.text.DateFormat;
import java.util.Date;
import java.util.Calendar;
import java.util.Properties;
/**
* This class is used for logging debug messages.
* Currently, there are three types of logging: {@link #INFO},
* {@link #TRACE} & {@link #ERROR}. Use the Debug.properties
* file to set or unset each type. Also use Debug.properties
* to set the writer to either <code>System.out</code>,
* <code>System.err</code>, or to a file.
*
*/
public final class Debug {
/** Informational messages. */
public final static int INFO = 0x0001;
/** Error messages. */
public final static int ERROR = 0x0002;
/** Trace messages. */
public final static int TRACE = 0x0004;
/** To set a flag. */
private final static boolean SET = true;
private static int flags = 0;
private static PrintWriter writer = null;
static {
try {
Class<? extends Debug> c = new Debug().getClass();
InputStream is = c.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);
} catch (Throwable ex) {
ex.printStackTrace(System.err);
}
}
/**
* Private constructor so as not to allow any instances
* of this class. This serves as a singleton class.
*/
private Debug() {
}
/**
* Set the output to the specified argument.
* This method is only used internally to prevent
* invalid string parameters.
*
* @param str Output specifier.
*/
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);
}
}
}
}
/**
* Set the output to an <code>OutputStream</code> object.
*
* @param stream OutputStream object.
*/
private static void setOutput(OutputStream stream) {
setOutput(new OutputStreamWriter(stream));
}
/**
* Set the <code>Writer</code> object to manage the output.
*
* @param w <code>Writer</code> object to write out.
*/
private static void setOutput(Writer w) {
if (writer != null) {
writer.close();
}
writer = new PrintWriter(new BufferedWriter(w), true);
}
/**
* <p>
* This method sets the levels for debugging logs.
* Example calls:
* </p>
*
* <blockquote><pre><code>
* Debug.setFlags( Debug.INFO, Debug.SET )
* Debug.setFlags( Debug.TRACE, Debug.SET )
* Debug.setFlags( Debug.INFO | Debug.TRACE, Debug.SET )
* Debug.setFlags( Debug.ERROR, Debug.UNSET )
* </code></pre></blockquote>
*
* @param f Debug flag
* @param set Use Debug.SET to set, and Debug.UNSET to unset
* the given flag.
*/
private static void setFlags(int f, boolean set) {
if (set) {
flags |= f;
} else {
flags &= ~f;
}
}
/**
* Prints out information regarding platform.
*/
public static void logSystemInfo() {
if (writer != null) {
writer.println();
writer.println("Platform Information:");
writer.println("OS : " + System.getProperty("os.name"));
writer.println("Version : " + System.getProperty("os.version"));
writer.println("Platform : " + System.getProperty("os.arch"));
writer.println("JDK Version : " + System.getProperty("java.version"));
writer.println("JDK Vendor : " + System.getProperty("java.vendor"));
writer.println();
}
}
/**
* Prints out timestamp.
*/
public static void logTime() {
if (writer != null) {
Date time = Calendar.getInstance().getTime();
DateFormat dt = DateFormat.getDateTimeInstance(DateFormat.FULL, DateFormat.FULL);
writer.println(dt.format(time));
}
}
/**
* Checks if flag is set.
*
* @return true if info logging is on, otherwise false
*/
public static boolean isFlagSet(int f) {
return ((flags & f) != 0);
}
/**
* <p>Log message based on the flag type.</p>
*
* <p>Example 1:</p>
*
* <blockquote><pre><code>
* Debug.log(Debug.INFO, "info string here");
* </code></pre></blockquote>
*
* <p>This logs the message during runtime if
* <code>debug.info</code> in the properties file is
* set to true.</p>
*
* <p>Example 2:</p>
*
* <blockquote><pre><code>
* Debug.log(Debug.INFO | Debug.TRACE, "info string here");
* </code></pre></blockquote>
*
* <p>This logs the message during runtime if debug.info or debug.trace
* in the properties file is set to true.</p>
*
* @param flag Log type, one of the Debug constants
* {@link #INFO}, {@link #TRACE}, {@link #ERROR}
* or a combination of which or'ed together.
* @param msg The message.
*/
public static void log(int flag, String msg) {
if (isFlagSet(flag)) {
if (writer != null) {
writer.println(msg);
}
}
}
/**
* Log message based on flag type plus print out stack trace
* of the exception passed in. Refer to the other log method
* for description.
*
* @param flag Log type, one of the Debug constants
* {@link #INFO}, {@link #TRACE}, {@link #ERROR}
* or a combination of which or'ed together.
* @param msg The message.
* @param e Throwable object.
*/
public static void log(int flag, String msg, Throwable e) {
if (isFlagSet(flag)) {
if (writer != null) {
writer.println(msg);
if (e != null)
e.printStackTrace(writer);
}
}
}
/**
* Converts the given bytes to a <code>String</code> of
* Hex digits.
*
* @param bytes <code>byte</code> array.
*
* @return Hex representation in a <code>String</code>.
*/
public static String byteArrayToHexString(byte bytes[]) {
StringBuffer buff = new StringBuffer();
for (int i = 0; i < bytes.length; i++) {
int ch = (bytes[i] & 0xff);
String str = Integer.toHexString(ch);
if (str.length() < 2)
buff.append('0');
buff.append(str);
buff.append(' ');
}
return buff.toString();
}
}
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