mport java.io.File;
import java.net.JarURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.Vector;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import javax.swing.JProgressBar;
/**
* ClassCollector sammelt Klassen einer Gegebenen unter Vorgabe eines
* Unterverzeichnises, welches direkt unter dem Package der gegebenen Klasse
* liegt.
* Diese Klasse ist zum dynamischen Zuladen von Klassen geeignet. Auf diese Weise
* können z.B. Unterdialoge zur Laufzeit einem Übergeordneten Panel zugeordnet werden
*/
public class ClassCollector
{
Vector m_classNames = new Vector();
String m_path;
String m_packageName;
String m_subPackageName;
String m_lastQual;
Class m_class;
public ClassCollector(Class klasse, String lastQualifier)
{
m_class = klasse;
m_path = m_class.getResource("").getFile();
m_lastQual = lastQualifier;
m_packageName = m_class.getName().substring(0, m_class.getName().lastIndexOf('.'));
if (m_lastQual!=null && m_lastQual.length()>0)
{
m_subPackageName = m_packageName + '.' + m_lastQual;
}
else
{
m_subPackageName = m_packageName;
}
try
{
collectClassNames();
}
catch (Exception e)
{
MExceptionHandler.handleException(e);
}
} // end of ClassCollector(Class, String)
protected void collectClassNames() throws Exception
{
Vector classFileNames = new Vector();
if (m_class.getResource("").getProtocol().equalsIgnoreCase("jar"))
{
URLConnection urlConn = m_class.getResource("").openConnection();
if (!(urlConn instanceof JarURLConnection))
{
throw new Exception("Is jar file but has no JarURLConnection");
}
JarURLConnection jarConn = (JarURLConnection)urlConn;
JarFile jarFile = jarConn.getJarFile();
for (Enumeration e = jarFile.entries(); e.hasMoreElements(); )
{
JarEntry currentEntry = (JarEntry)e.nextElement();
if (currentEntry.getName().startsWith(m_path)
&&!currentEntry.isDirectory())
{
classFileNames.add(currentEntry.getName());
} // end of if
} // end of for e
} // end of if(Classe in einer .jar Datei)
else
{
URL url;
url = m_class.getResource("/"+m_subPackageName.replace('.','/'));
// System.out.println("2. url="+url.toString());
if (url==null)
{
throw new Exception("Kann "+m_lastQual+" Verzeichnis nicht finden"+
"\nres="+m_class.getResource(""));
}
File demosDir = new File(url.getFile());
if (demosDir==null)
{
throw new Exception("Kann "+m_lastQual+" Verzeichnis nicht finden"+
"\n url="+url);
}
if (!demosDir.isDirectory())
{
throw new Exception(m_lastQual+" ist kein Verzeichnis"+
"\n url="+url+
"\n file="+demosDir);
}
String[] list = demosDir.list();
for (int i = 0; i<list.length; i++)
{
String fullName = m_subPackageName+"."+list[i];
classFileNames.add(fullName);
}
} // end of if else (Classe in einer .jar Datei)
for (int i = 0; i<classFileNames.size(); i++)
{
String currentName = (String)classFileNames.get(i);
if (currentName.indexOf("$")==-1 && currentName.endsWith(".class"))
{
// remove trailing ".class"
currentName = currentName.substring(0, currentName.length()-6);
StringBuffer tmp = new StringBuffer(currentName);
for (int j = 0; j<tmp.length(); j++)
{
if (tmp.charAt(j)=='/'||tmp.charAt(j)=='\\')
tmp.setCharAt(j, '.');
}
m_classNames.add(tmp.toString());
}
}
} // end of collectClassNames()
public List loadClasses(JProgressBar progressBar)
{
List loadedClasses = new ArrayList();
int count = progressBar.getValue();
for (int i = 0; i<m_classNames.size(); i++)
{
String className = (String)m_classNames.get(i);
String progressName = className.substring(m_subPackageName.length()+1,
className.length());
progressBar.setValue(count++);
progressBar.setString("Lade "+progressName);
try
{
Class currentClass = Class.forName(className);
Object obj = currentClass.newInstance();
if (m_class.isInstance(obj))
{
loadedClasses.add(obj);
}
}
catch (Exception e)
{
MExceptionHandler.handleException(e);
}
}
return loadedClasses;
} // end of loadClasses(JProgressBar)
public List loadClasses()
{
List loadedClasses = new ArrayList();
for (int i = 0; i<m_classNames.size(); i++)
{
try
{
Class currentClass = Class.forName((String)m_classNames.get(i));
if (!currentClass.isInterface())
{
Object obj = currentClass.newInstance();
if(m_class.isInstance(obj))
{
loadedClasses.add(obj);
}
}
}
catch (Exception e)
{
MExceptionHandler.handleException(e);
}
}
return loadedClasses;
} // end of loadClasses()
public String[] getClassNames()
{
return (String[])m_classNames.toArray((Object[])new String[0]);
}
public String getClassName(int i)
{
return (String)m_classNames.get(i);
}
} // end of ClassCollector
