server/core/ConfigurationManagerServant.java

//---PACKAGE DECLARATION---
package uk.org.iscream.cms.server.core;

//---IMPORTS---
import uk.org.iscream.cms.server.util.*;
import uk.org.iscream.cms.server.componentmanager.*;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.*;
import java.io.*;

/**
 * This class is essentially a Configuration factory.
 * This class implements the Configurator IDL and allows
 * other classes in the system ot obtain their Configuration
 *
 * On construction it requires a reference to the RootPOA
 * to allow it to create Configuration objects to be
 * returned.
 *
 * It also relies on the System.properties to set internal values.
 *
 * @author  $Author: tdb $
 * @version $Id: ConfigurationManagerServant.java,v 1.20 2001/12/10 22:49:19 tdb Exp $
 */
class ConfigurationManagerServant extends ConfigurationManagerPOA {

//---FINAL ATTRIBUTES---

    /**
     * The current CVS revision of this class
     */
    public final String REVISION = "$Revision: 1.20 $";
    
//---STATIC METHODS---

//---CONSTRUCTORS---

    /**
     * Creates a new ConfiguratorServant
     * This class uses the System.properties to set internal values
     */
    ConfigurationManagerServant() {
        // assign some local variables
        _configPath = System.getProperty("uk.org.iscream.cms.server.ConfigurationLocation");
        _systemConfigFile = System.getProperty("uk.org.iscream.cms.server.SystemConfigurationFile");

        // load the system config
        loadSystemConfig();

        // log our status
        _logger.write(toString(), Logger.SYSINIT, "started");
        _logger.write(toString(), Logger.SYSMSG, "configuration location - " + _configPath);
        _logger.write(toString(), Logger.SYSMSG, "system configuration file - " + _systemConfigFile);
    }

//---PUBLIC METHODS---
    
    /**
     * Returns a Configuration object which contains
     * the configuration data requested by the calling
     * object.
     *
     * This method will look in the systemConfig file
     * for an entry for this "source", if there is no
     * entry it returns a refernce to the system
     * config.  If there are any errors in reading the 
     * configuration, it returns null, the caller is 
     * expected to be able to handle this.
     *
     * This method also checks to see if the system.conf
     * file has been updated and reloads its reference if
     * needed.
     *
     * @param source the configuration required
     * @return the Configuration
     */
    public Configuration getConfiguration(String source) {
        _logger.write(toString(), Logger.SYSMSG, "got request for " + source);

        
        // check to see if we need to reload the system config
        // because it has changed
        if (isModified(_systemConfig.getFileList(), _systemConfig.getLastModified())) {
            _logger.write(toString(), Logger.SYSMSG, "system config changed");
            loadSystemConfig();
        }

        // search config for group membership
        // and obain a list of groups by name
        LinkedList nameGroups = getGroupMembership(source);
        // add the hosts individual config to the start of the list
        nameGroups.addFirst(source);
        
        // this list will be used to compile the groupings
        LinkedList groups = new LinkedList();
                     
        // if we are dealing with a Host.<hostname> request, then we also
        // want to look for ip address details, as configuration entries may relate to it
        // if we can't resolve it, we don't look.
        LinkedList ipGroups = null;
        if (source.startsWith("Host.")) {
            // hostname is after Host.
            String hostname = source.substring(5);
            try {
                String ip = "Host." + InetAddress.getByName(hostname).getHostAddress();
                ipGroups = getGroupMembership(ip);
                ipGroups.addFirst(ip);
                // add to our list of groups
                groups.addAll(ipGroups);
            } catch (UnknownHostException e) {
                _logger.write(toString(), Logger.ERROR, "could not resolve hostname - " + hostname);
            }
        }
        
        // add the rest of the groups to the end        
        groups.addAll(nameGroups);

        Iterator i = groups.iterator();
        String fileList = "";
        while (i.hasNext()) {
            String groupName = (String) i.next();
            _logger.write(toString(), Logger.DEBUG, "looking for config entry for - " + groupName);
            // we look for this entry in the systemConfig
            String configFile = _systemConfig.getProperty("config." + groupName);
            // if there is a config entry then
            if (configFile != null) {
                _logger.write(toString(), Logger.DEBUG, "looking for config tree in - " + configFile);
    
                // get the file list of includes etc + the system config
                String groupFileList = null;
                try {
                    groupFileList = getIncludedFiles(configFile, "") + ";";
                } catch (Exception e) {
                    // not sure what to do here
                    // so we just log the error
                    _logger.write(toString(), Logger.ERROR, "ERROR - " + e);
                }
                if (groupFileList != null) {
                    fileList += groupFileList;
                }
            } else {
                _logger.write(toString(), Logger.DEBUG, "no config entry for - " + groupName);
            }
        }
        // add the system config as the final check
        fileList = _systemConfigFile + ";" + fileList;
        _logger.write(toString(), Logger.DEBUG, "config tree - " + fileList);
        
        // build the configuration
        Configuration config = buildConfiguration(fileList);
        
        // if this is null at this point, then there will have been an error
        return config;
    }
    
    
    /**
     * When passed a file list and a current value for the lastModified
     * of the current configuration, this method compares the value
     * to the actual value of the configuration files to determine 
     * whether or not the configuration has been modified.
     *
     * @param fileList a list of files that the caller uses for configuration
     * @param lastModified the last modified date of the callers configuration
     *
     * @return whether or not the configuration has been modified
     */
    public boolean isModified(String fileList, long lastModified) {
        StringTokenizer st = new StringTokenizer(fileList, ";");
        long newLastModified;
        File currentFile;
        while (st.hasMoreTokens()) {
            currentFile = new File(_configPath, st.nextToken());
            newLastModified = currentFile.lastModified();
            if (newLastModified > lastModified) {
                return true;
            }
        }
        return false;
    }

    /**
     * Overrides the {@link java.lang.Object#toString() Object.toString()}
     * method to provide clean logging (every class should have this).
     *
     * This uses the uk.org.iscream.cms.server.util.FormatName class
     * to format the toString()
     *
     * @return the name of this class and its CVS revision
     */
    public String toString() {
        return FormatName.getName(
            _name,
            getClass().getName(),
            REVISION);
    }

//---PRIVATE METHODS---

    /**
     * This is a recursive function private to this class.
     * It constructs a hierarchy of files as a ";" serperated
     * string which can be used to read in the configuration.
     * This function calls itself.
     * 
     * @param currentFile the current file to be processed
     * @param readFiles used for recursion purposes only, these are the files it has read so far 
     *
     * @return the current list that has been constructed
     *
     * @throws IOException if there is trouble reading the file
     * @throws FileNotFoundException is there is trouble finding the file
     * @throws CircularIncludeException this is if a circular include is detected
     */
    private String getIncludedFiles(String currentFile, String readFiles) throws IOException, FileNotFoundException, Exception {
        
        // check for circular include here
        if (hasDuplicate(currentFile, readFiles) || currentFile.equals(_systemConfigFile)) {
            throw new CircularIncludeException(currentFile + " is included more than once");
        }
        
        // if there wasn't, we're gonna use this file, so make a note of it as read
        // (note the use of the ";", this is for the hasDuplicate, function)
        readFiles = readFiles + currentFile + ";";

        Properties properties = new Properties();
        properties.load(new FileInputStream(new File(_configPath, currentFile)));
        
        // get the include property
        String includes = properties.getProperty("include");

        // if we're the last file with no includes, return our name
        if (includes == null) {
            return currentFile;
        
        // otherwise, recurse over our includes
        } else {
            StringTokenizer st = new StringTokenizer(includes, ";");
            String returnList= "";
            while (st.hasMoreTokens()) {
                returnList = getIncludedFiles(st.nextToken(), readFiles) + ";" + returnList;
            }
            
            return returnList + currentFile;
        }
    }

    /**
     * This simple method checks to see if a given 
     * file exists in the given list.
     *
     * @param file the file to check the list for
     * @param fileList the list to check
     *
     * @return if the given file appeard in the list
     */
    private boolean hasDuplicate(String file, String fileList) {
        StringTokenizer st = new StringTokenizer(fileList, ";");
        while (st.hasMoreTokens()) {
            if (file.equals(st.nextToken())) {
                return true;
            }
        }
        return false;
    }

    /**
     * Opens and loads the system configuration into the 
     * local reference _systemConfig
     */
    private void loadSystemConfig() {
        _logger.write(this.toString(), Logger.SYSMSG, "reloading " + _systemConfigFile);
        // get a reference to the system config and store it
        try {
            // create the properties for the configuration
            File systemConfigFile = new File(_configPath, _systemConfigFile);
            _systemConfigHolder = new Properties();
            _systemConfigHolder.load(new FileInputStream(systemConfigFile));
            
            // create the servant
            ConfigurationServant ref = new ConfigurationServant(_systemConfigHolder, _systemConfigFile, systemConfigFile.lastModified());
            org.omg.CORBA.Object objRef = _refman.getRootPOA().servant_to_reference(ref);
            
            // narrow it to a Configuration
            _systemConfig = ConfigurationHelper.narrow(objRef);
            
        } catch (Exception e) {
            _logger.write(toString(), Logger.FATAL, "ERROR: " + e.getMessage());
        }
    }

    /**
     * Parses the system configuration file
     * for group membership entries.
     *
     * It looks for all entries of group.<name>
     * which contain the given source name
     *
     * @param source the source to find membership for
     *
     * @return the list of groups that this source is a member of
     */
    private LinkedList getGroupMembership(String source) {
        _logger.write(toString(), Logger.DEBUG, "searching groups for - " + source);
        LinkedList groupMembership = new LinkedList();        
        Iterator i = new TreeSet(_systemConfigHolder.keySet()).iterator();
        while(i.hasNext()) {
            String key = (String) i.next();
            if (key.startsWith("group.")) {
                String group = _systemConfig.getProperty(key);
                // if it is in the group
                if (group.indexOf(source) != -1) {
                    groupMembership.add(key.substring(6));
                    _logger.write(toString(), Logger.DEBUG, "group match found for - " + source + " in - " + key);
                
                // if there are wildcards in the group
                } else if (group.indexOf("*") != -1) {
                    // check the wildcards apply to this srce
                    if(StringUtils.wildcardCheck(source, group)) {
                        groupMembership.add(key.substring(6));
                        _logger.write(toString(), Logger.DEBUG, "wildcard group match found for - " + source + " in - " + key);
                    }
                }
                
            }   
        }
        return groupMembership;
    }

    /**
     * Build the properties as a Configuration to be 
     * returned to the caller
     *
     * @param fileList the list of files to build the configuration from
     *
     * @return the built Configuration
     */
    private Configuration buildConfiguration(String fileList) {
        Configuration config = null;

        // if there is an entry
        if (!fileList.equals("")) {
            try {
                
                // build the properites here from the filelist.... 
                StringTokenizer st = new StringTokenizer(fileList, ";");
                
                // some holders for variables
                File currentFile;
                long lastModified = 0, newLastModified = 0;
                Properties properties = null, prevProperties = null;
                
                // the root of all configurations will be the system config
                // so we need to open the properties of that
                Properties defaultProperties = new Properties();
                
                // This loop then iterates over the file list
                // creates the properties to be passed to the
                // Configuration constructor
                while (st.hasMoreTokens()) {
                    properties = new Properties(defaultProperties);
                    currentFile = new File(_configPath, st.nextToken());
                    newLastModified = currentFile.lastModified();
                    if (newLastModified > lastModified) {
                        lastModified = newLastModified;
                    }
                    properties.load(new FileInputStream(currentFile));
                    defaultProperties = properties;
                }

                // this creates the configuration, all nice, ready to be returned
                ConfigurationServant ref = new ConfigurationServant(properties, fileList, lastModified);
                org.omg.CORBA.Object objRef = _refman.getRootPOA().servant_to_reference(ref);
                config = ConfigurationHelper.narrow(objRef);
                _logger.write(toString(), Logger.DEBUG, "returning built configuration");
            } catch (Exception e) {
                // not sure what to do here
                // so we just log the error
                _logger.write(toString(), Logger.ERROR, "ERROR - " + e);
            }
            
        // if there isn't an entry for the requested config
        } else {
            _logger.write(toString(), Logger.DEBUG, "no configured config, returning " + _systemConfigFile);
            config = _systemConfig;
        }
        return config;
    }

//---ACCESSOR/MUTATOR METHODS---

//---ATTRIBUTES---

    /**
     * This is the friendly identifier of the
     * component this class is running in.
     * eg, a Filter may be called "filter1",
     * If this class does not have an owning
     * component,  a name from the configuration
     * can be placed here.  This name could also
     * be changed to null for utility classes.
     */
    private String _name = Core.NAME;

    /**
     * This holds a reference to the
     * system logger that is being used.
     */
    private Logger _logger = ReferenceManager.getInstance().getLogger();
    
    /**
     * A reference to the reference manager in use
     */
    private ReferenceManager _refman = ReferenceManager.getInstance();
    
    /**
     * The root path to all configurations
     */
    private String _configPath;
    
    /**
     * The name of the file that contains the system configuration
     */
    private String _systemConfigFile;
    
    /**
     * An instance of the system config
     */
    private Configuration _systemConfig;
    
    /**
     * The system config file represented by a
     * properties object.
     */
    private Properties _systemConfigHolder;
    
//---STATIC ATTRIBUTES---
    
}
Revision:	1.21
Committed:	Tue Dec 11 14:56:12 2001 UTC (22 years, 5 months ago) by tdb
Branch:	MAIN
Changes since 1.20:	+2 -7 lines
Log Message:	Removed note about not cleaning up Configuration objects - that's handled elsewhere now.
#	Content
1	//---PACKAGE DECLARATION---
2	package uk.org.iscream.cms.server.core;
3
4	//---IMPORTS---
5	import uk.org.iscream.cms.server.util.*;
6	import uk.org.iscream.cms.server.componentmanager.*;
7	import java.net.InetAddress;
8	import java.net.UnknownHostException;
9	import java.util.*;
10	import java.io.*;
11
12	/**
13	* This class is essentially a Configuration factory.
14	* This class implements the Configurator IDL and allows
15	* other classes in the system ot obtain their Configuration
16	*
17	* On construction it requires a reference to the RootPOA
18	* to allow it to create Configuration objects to be
19	* returned.
20	*
21	* It also relies on the System.properties to set internal values.
22	*
23	* @author $Author: tdb $
24	* @version $Id: ConfigurationManagerServant.java,v 1.20 2001/12/10 22:49:19 tdb Exp $
25	*/
26	class ConfigurationManagerServant extends ConfigurationManagerPOA {
27
28	//---FINAL ATTRIBUTES---
29
30	/**
31	* The current CVS revision of this class
32	*/
33	public final String REVISION = "$Revision: 1.20 $";
34
35	//---STATIC METHODS---
36
37	//---CONSTRUCTORS---
38
39	/**
40	* Creates a new ConfiguratorServant
41	* This class uses the System.properties to set internal values
42	*/
43	ConfigurationManagerServant() {
44	// assign some local variables
45	_configPath = System.getProperty("uk.org.iscream.cms.server.ConfigurationLocation");
46	_systemConfigFile = System.getProperty("uk.org.iscream.cms.server.SystemConfigurationFile");
47
48	// load the system config
49	loadSystemConfig();
50
51	// log our status
52	_logger.write(toString(), Logger.SYSINIT, "started");
53	_logger.write(toString(), Logger.SYSMSG, "configuration location - " + _configPath);
54	_logger.write(toString(), Logger.SYSMSG, "system configuration file - " + _systemConfigFile);
55	}
56
57	//---PUBLIC METHODS---
58
59	/**
60	* Returns a Configuration object which contains
61	* the configuration data requested by the calling
62	* object.
63	*
64	* This method will look in the systemConfig file
65	* for an entry for this "source", if there is no
66	* entry it returns a refernce to the system
67	* config. If there are any errors in reading the
68	* configuration, it returns null, the caller is
69	* expected to be able to handle this.
70	*
71	* This method also checks to see if the system.conf
72	* file has been updated and reloads its reference if
73	* needed.
74	*
75	* @param source the configuration required
76	* @return the Configuration
77	*/
78	public Configuration getConfiguration(String source) {
79	_logger.write(toString(), Logger.SYSMSG, "got request for " + source);
80
81
82	// check to see if we need to reload the system config
83	// because it has changed
84	if (isModified(_systemConfig.getFileList(), _systemConfig.getLastModified())) {
85	_logger.write(toString(), Logger.SYSMSG, "system config changed");
86	loadSystemConfig();
87	}
88
89	// search config for group membership
90	// and obain a list of groups by name
91	LinkedList nameGroups = getGroupMembership(source);
92	// add the hosts individual config to the start of the list
93	nameGroups.addFirst(source);
94
95	// this list will be used to compile the groupings
96	LinkedList groups = new LinkedList();
97
98	// if we are dealing with a Host.<hostname> request, then we also
99	// want to look for ip address details, as configuration entries may relate to it
100	// if we can't resolve it, we don't look.
101	LinkedList ipGroups = null;
102	if (source.startsWith("Host.")) {
103	// hostname is after Host.
104	String hostname = source.substring(5);
105	try {
106	String ip = "Host." + InetAddress.getByName(hostname).getHostAddress();
107	ipGroups = getGroupMembership(ip);
108	ipGroups.addFirst(ip);
109	// add to our list of groups
110	groups.addAll(ipGroups);
111	} catch (UnknownHostException e) {
112	_logger.write(toString(), Logger.ERROR, "could not resolve hostname - " + hostname);
113	}
114	}
115
116	// add the rest of the groups to the end
117	groups.addAll(nameGroups);
118
119	Iterator i = groups.iterator();
120	String fileList = "";
121	while (i.hasNext()) {
122	String groupName = (String) i.next();
123	_logger.write(toString(), Logger.DEBUG, "looking for config entry for - " + groupName);
124	// we look for this entry in the systemConfig
125	String configFile = _systemConfig.getProperty("config." + groupName);
126	// if there is a config entry then
127	if (configFile != null) {
128	_logger.write(toString(), Logger.DEBUG, "looking for config tree in - " + configFile);
129
130	// get the file list of includes etc + the system config
131	String groupFileList = null;
132	try {
133	groupFileList = getIncludedFiles(configFile, "") + ";";
134	} catch (Exception e) {
135	// not sure what to do here
136	// so we just log the error
137	_logger.write(toString(), Logger.ERROR, "ERROR - " + e);
138	}
139	if (groupFileList != null) {
140	fileList += groupFileList;
141	}
142	} else {
143	_logger.write(toString(), Logger.DEBUG, "no config entry for - " + groupName);
144	}
145	}
146	// add the system config as the final check
147	fileList = _systemConfigFile + ";" + fileList;
148	_logger.write(toString(), Logger.DEBUG, "config tree - " + fileList);
149
150	// build the configuration
151	Configuration config = buildConfiguration(fileList);
152
153	// if this is null at this point, then there will have been an error
154	return config;
155	}
156
157
158	/**
159	* When passed a file list and a current value for the lastModified
160	* of the current configuration, this method compares the value
161	* to the actual value of the configuration files to determine
162	* whether or not the configuration has been modified.
163	*
164	* @param fileList a list of files that the caller uses for configuration
165	* @param lastModified the last modified date of the callers configuration
166	*
167	* @return whether or not the configuration has been modified
168	*/
169	public boolean isModified(String fileList, long lastModified) {
170	StringTokenizer st = new StringTokenizer(fileList, ";");
171	long newLastModified;
172	File currentFile;
173	while (st.hasMoreTokens()) {
174	currentFile = new File(_configPath, st.nextToken());
175	newLastModified = currentFile.lastModified();
176	if (newLastModified > lastModified) {
177	return true;
178	}
179	}
180	return false;
181	}
182
183	/**
184	* Overrides the {@link java.lang.Object#toString() Object.toString()}
185	* method to provide clean logging (every class should have this).
186	*
187	* This uses the uk.org.iscream.cms.server.util.FormatName class
188	* to format the toString()
189	*
190	* @return the name of this class and its CVS revision
191	*/
192	public String toString() {
193	return FormatName.getName(
194	_name,
195	getClass().getName(),
196	REVISION);
197	}
198
199	//---PRIVATE METHODS---
200
201	/**
202	* This is a recursive function private to this class.
203	* It constructs a hierarchy of files as a ";" serperated
204	* string which can be used to read in the configuration.
205	* This function calls itself.
206	*
207	* @param currentFile the current file to be processed
208	* @param readFiles used for recursion purposes only, these are the files it has read so far
209	*
210	* @return the current list that has been constructed
211	*
212	* @throws IOException if there is trouble reading the file
213	* @throws FileNotFoundException is there is trouble finding the file
214	* @throws CircularIncludeException this is if a circular include is detected
215	*/
216	private String getIncludedFiles(String currentFile, String readFiles) throws IOException, FileNotFoundException, Exception {
217
218	// check for circular include here
219	if (hasDuplicate(currentFile, readFiles) \|\| currentFile.equals(_systemConfigFile)) {
220	throw new CircularIncludeException(currentFile + " is included more than once");
221	}
222
223	// if there wasn't, we're gonna use this file, so make a note of it as read
224	// (note the use of the ";", this is for the hasDuplicate, function)
225	readFiles = readFiles + currentFile + ";";
226
227	Properties properties = new Properties();
228	properties.load(new FileInputStream(new File(_configPath, currentFile)));
229
230	// get the include property
231	String includes = properties.getProperty("include");
232
233	// if we're the last file with no includes, return our name
234	if (includes == null) {
235	return currentFile;
236
237	// otherwise, recurse over our includes
238	} else {
239	StringTokenizer st = new StringTokenizer(includes, ";");
240	String returnList= "";
241	while (st.hasMoreTokens()) {
242	returnList = getIncludedFiles(st.nextToken(), readFiles) + ";" + returnList;
243	}
244
245	return returnList + currentFile;
246	}
247	}
248
249	/**
250	* This simple method checks to see if a given
251	* file exists in the given list.
252	*
253	* @param file the file to check the list for
254	* @param fileList the list to check
255	*
256	* @return if the given file appeard in the list
257	*/
258	private boolean hasDuplicate(String file, String fileList) {
259	StringTokenizer st = new StringTokenizer(fileList, ";");
260	while (st.hasMoreTokens()) {
261	if (file.equals(st.nextToken())) {
262	return true;
263	}
264	}
265	return false;
266	}
267
268	/**
269	* Opens and loads the system configuration into the
270	* local reference _systemConfig
271	*/
272	private void loadSystemConfig() {
273	_logger.write(this.toString(), Logger.SYSMSG, "reloading " + _systemConfigFile);
274	// get a reference to the system config and store it
275	try {
276	// create the properties for the configuration
277	File systemConfigFile = new File(_configPath, _systemConfigFile);
278	_systemConfigHolder = new Properties();
279	_systemConfigHolder.load(new FileInputStream(systemConfigFile));
280
281	// create the servant
282	ConfigurationServant ref = new ConfigurationServant(_systemConfigHolder, _systemConfigFile, systemConfigFile.lastModified());
283	org.omg.CORBA.Object objRef = _refman.getRootPOA().servant_to_reference(ref);
284
285	// narrow it to a Configuration
286	_systemConfig = ConfigurationHelper.narrow(objRef);
287
288	} catch (Exception e) {
289	_logger.write(toString(), Logger.FATAL, "ERROR: " + e.getMessage());
290	}
291	}
292
293	/**
294	* Parses the system configuration file
295	* for group membership entries.
296	*
297	* It looks for all entries of group.<name>
298	* which contain the given source name
299	*
300	* @param source the source to find membership for
301	*
302	* @return the list of groups that this source is a member of
303	*/
304	private LinkedList getGroupMembership(String source) {
305	_logger.write(toString(), Logger.DEBUG, "searching groups for - " + source);
306	LinkedList groupMembership = new LinkedList();
307	Iterator i = new TreeSet(_systemConfigHolder.keySet()).iterator();
308	while(i.hasNext()) {
309	String key = (String) i.next();
310	if (key.startsWith("group.")) {
311	String group = _systemConfig.getProperty(key);
312	// if it is in the group
313	if (group.indexOf(source) != -1) {
314	groupMembership.add(key.substring(6));
315	_logger.write(toString(), Logger.DEBUG, "group match found for - " + source + " in - " + key);
316
317	// if there are wildcards in the group
318	} else if (group.indexOf("*") != -1) {
319	// check the wildcards apply to this srce
320	if(StringUtils.wildcardCheck(source, group)) {
321	groupMembership.add(key.substring(6));
322	_logger.write(toString(), Logger.DEBUG, "wildcard group match found for - " + source + " in - " + key);
323	}
324	}
325
326	}
327	}
328	return groupMembership;
329	}
330
331	/**
332	* Build the properties as a Configuration to be
333	* returned to the caller
334	*
335	* @param fileList the list of files to build the configuration from
336	*
337	* @return the built Configuration
338	*/
339	private Configuration buildConfiguration(String fileList) {
340	Configuration config = null;
341
342	// if there is an entry
343	if (!fileList.equals("")) {
344	try {
345
346	// build the properites here from the filelist....
347	StringTokenizer st = new StringTokenizer(fileList, ";");
348
349	// some holders for variables
350	File currentFile;
351	long lastModified = 0, newLastModified = 0;
352	Properties properties = null, prevProperties = null;
353
354	// the root of all configurations will be the system config
355	// so we need to open the properties of that
356	Properties defaultProperties = new Properties();
357
358	// This loop then iterates over the file list
359	// creates the properties to be passed to the
360	// Configuration constructor
361	while (st.hasMoreTokens()) {
362	properties = new Properties(defaultProperties);
363	currentFile = new File(_configPath, st.nextToken());
364	newLastModified = currentFile.lastModified();
365	if (newLastModified > lastModified) {
366	lastModified = newLastModified;
367	}
368	properties.load(new FileInputStream(currentFile));
369	defaultProperties = properties;
370	}
371
372	// this creates the configuration, all nice, ready to be returned
373	ConfigurationServant ref = new ConfigurationServant(properties, fileList, lastModified);
374	org.omg.CORBA.Object objRef = _refman.getRootPOA().servant_to_reference(ref);
375	config = ConfigurationHelper.narrow(objRef);
376	_logger.write(toString(), Logger.DEBUG, "returning built configuration");
377	} catch (Exception e) {
378	// not sure what to do here
379	// so we just log the error
380	_logger.write(toString(), Logger.ERROR, "ERROR - " + e);
381	}
382
383	// if there isn't an entry for the requested config
384	} else {
385	_logger.write(toString(), Logger.DEBUG, "no configured config, returning " + _systemConfigFile);
386	config = _systemConfig;
387	}
388	return config;
389	}
390
391	//---ACCESSOR/MUTATOR METHODS---
392
393	//---ATTRIBUTES---
394
395	/**
396	* This is the friendly identifier of the
397	* component this class is running in.
398	* eg, a Filter may be called "filter1",
399	* If this class does not have an owning
400	* component, a name from the configuration
401	* can be placed here. This name could also
402	* be changed to null for utility classes.
403	*/
404	private String _name = Core.NAME;
405
406	/**
407	* This holds a reference to the
408	* system logger that is being used.
409	*/
410	private Logger _logger = ReferenceManager.getInstance().getLogger();
411
412	/**
413	* A reference to the reference manager in use
414	*/
415	private ReferenceManager _refman = ReferenceManager.getInstance();
416
417	/**
418	* The root path to all configurations
419	*/
420	private String _configPath;
421
422	/**
423	* The name of the file that contains the system configuration
424	*/
425	private String _systemConfigFile;
426
427	/**
428	* An instance of the system config
429	*/
430	private Configuration _systemConfig;
431
432	/**
433	* The system config file represented by a
434	* properties object.
435	*/
436	private Properties _systemConfigHolder;
437
438	//---STATIC ATTRIBUTES---
439
440	}