001/*
002 * Cobertura - http://cobertura.sourceforge.net/
003 *
004 * Copyright (C) 2007 Joakim Erdfelt
005 *
006 * Cobertura is free software; you can redistribute it and/or modify
007 * it under the terms of the GNU General Public License as published
008 * by the Free Software Foundation; either version 2 of the License,
009 * or (at your option) any later version.
010 *
011 * Cobertura is distributed in the hope that it will be useful, but
012 * WITHOUT ANY WARRANTY; without even the implied warranty of
013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014 * General Public License for more details.
015 *
016 * You should have received a copy of the GNU General Public License
017 * along with Cobertura; if not, write to the Free Software
018 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
019 * USA
020 */
021
022package net.sourceforge.cobertura.util;
023
024import java.io.IOException;
025import java.io.InputStream;
026import java.net.URL;
027import java.util.Properties;
028
029/**
030 * A Utility Class to load the configuration.
031 * 
032 * Checks for values using the following hierarchy.
033 * 1) System Property matching key.
034 * 2) cobertura.properties Resource Property matching key.
035 * 3) hardcoded default value
036 * 
037 * @author Joakim Erdfelt
038 */
039public class ConfigurationUtil
040{
041    public static final String RESOURCE = "/cobertura.properties";
042
043    private Properties props;
044
045    public ConfigurationUtil()
046    {
047        init();
048    }
049
050    public void init()
051    {
052        props = new Properties();
053
054        URL url = this.getClass().getResource( RESOURCE );
055        if ( url == null )
056        {
057            DEBUG( "Unable to find configuration resource in classpath of name " + RESOURCE + ", using empty configuration." );
058            return;
059        }
060
061        InputStream is = null;
062        try
063        {
064            is = url.openStream();
065            props.load( is );
066        }
067        catch ( IOException e )
068        {
069            System.err.println( "ERROR: Unable to load configuration resource " + RESOURCE + " - " + e.getMessage() );
070        }
071        finally
072        {
073            IOUtil.closeInputStream( is );
074        }
075    }
076
077    public String getProperty( String key, String defvalue )
078    {
079        String value = System.getProperty( key );
080        if ( value != null )
081        {
082            DEBUG("Using system property value [" + value + "] for key [" + key + "]");
083            return value;
084        }
085
086        value = props.getProperty( key );
087        if ( value != null )
088        {
089            DEBUG("Using cobertura.properties value [" + value + "] for key [" + key + "]");
090            return value;
091        }
092
093        DEBUG("Using default value [" + defvalue + "] for key [" + key + "]");
094        return defvalue;
095    }
096
097    public String getDatafile()
098    {
099        return getProperty( "net.sourceforge.cobertura.datafile", "cobertura.ser" );
100    }
101    
102    /**
103     * Poor mans debugging.
104     * Intentionally didn't use log4j, as we dont want to introduce that dependency on instrumented files.
105     */
106    private void DEBUG(String msg)
107    {
108        if(false)
109        {
110            System.out.println("[Cobertura:ConfigurationUtil] " + msg);
111        }
112    }
113}