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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.

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/*   Copyright 2004 The Apache Software Foundation
 *
 *   Licensed 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
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.apache.xmlbeans.impl.common;

import org.apache.xmlbeans.SystemProperties;

import java.io.File;
import java.io.PrintStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class XBeanDebug
{
    public static final int TRACE_SCHEMA_LOADING = 0x0001;
    public static final String traceProp = "org.apache.xmlbeans.impl.debug";
    public static final String defaultProp = ""; // "TRACE_SCHEMA_LOADING";

    private static int _enabled = initializeBitsFromProperty();
    private static int _indent = 0;
    private static String _indentspace = "                                                                                ";

    private static int initializeBitsFromProperty()
    {
        int bits = 0;
        String prop = SystemProperties.getProperty(traceProp, defaultProp);
        if (prop.indexOf("TRACE_SCHEMA_LOADING") >= 0)
            bits |= TRACE_SCHEMA_LOADING;
        return bits;
    }
    public static void enable(int bits)
    {
        _enabled = _enabled | bits;
    }

    public static void disable(int bits)
    {
        _enabled = _enabled & ~bits;
    }

    public static void trace(int bits, String message, int indent)
    {
        if (test(bits))
        {
            synchronized (XBeanDebug.class)
            {
                if (indent < 0)
                    _indent += indent;

                String spaces = _indent < 0 ? "" : _indent > _indentspace.length() ? _indentspace : _indentspace.substring(0, _indent);
                String logmessage = Thread.currentThread().getName() + ": " + spaces + message + "\n";
                System.err.print(logmessage);

                if (indent > 0)
                    _indent += indent;
            }
        }
    }

    public static boolean test(int bits)
    {
        return (_enabled & bits) != 0;
    }
    
    static PrintStream _err;
    
    public static String log(String message)
    {
        log(message, null);
        return message;
    }
    
    public static String logStackTrace(String message)
    {
        log(message, new Throwable());
        return message;
    }
    
    private synchronized static String log(String message, Throwable stackTrace)
    {
        if (_err == null)
        {
            try
            {
                File diagnosticFile = File.createTempFile("xmlbeandebug", ".log");
                _err = new PrintStream(new FileOutputStream(diagnosticFile));
                System.err.println("Diagnostic XML Bean debug log file created: " + diagnosticFile);
            }
            catch (IOException e)
            {
                _err = System.err;
            }
        }
        _err.println(message);
        if (stackTrace != null)
        {
            stackTrace.printStackTrace(_err);
        }
        return message;
    }
    
    public static Throwable logException(Throwable t)
    {
        log(t.getMessage(), t);
        return t;
    }
}