/*
    * Copyright (c) 2001-2003 The XDoclet team
    * All rights reserved.
    */
   package xjavadoc;
   
   import xjavadoc.filesystem.AbstractFile;
   import xjavadoc.tags.TagIntrospector;
   
  import java.io.PrintStream;
  import java.util.*;
  
  import org.apache.commons.collections.Predicate;
  import org.apache.commons.collections.CollectionUtils;
  
  /***
   * This class represents the entry-point for xjavadoc classes. Come here to get
   * classes and packages.
   *
   * @author    Aslak Hellesøy
   * @created   3. januar 2002
   */
  public final class XJavaDoc
  {
  	/***
  	 * Indicates whether this XJavaDoc was built with or without unicode support
  	 */
  	public final static String IS_UNICODE = "@IS_UNICODE@";
  	/***
  	 * messgage level for reporting unqualified classes when there are no imported
  	 * packages
  	 */
  	public final static int NO_IMPORTED_PACKAGES = 0;
  	/***
  	 * messgage level for reporting unqualified classes when there are one or more
  	 * imported packages
  	 */
  	public final static int ONE_OR_MORE_IMPORTED_PACKAGES = 1;
  
  	private final static List PRIMITIVES = Collections.unmodifiableList( Arrays.asList( new String[]
  		{"void", "java.lang.Void.TYPE",
  		"byte", "java.lang.Byte.TYPE",
  		"short", "java.lang.Short.TYPE",
  		"int", "java.lang.Integer.TYPE",
  		"long", "java.lang.Long.TYPE",
  		"char", "java.lang.Character.TYPE",
  		"float", "java.lang.Float.TYPE",
  		"double", "java.lang.Double.TYPE",
  		"boolean", "java.lang.Boolean.TYPE"
  		} ) );
  
  	private static HashMap _primitiveClasses = new HashMap();
  	private final Map  _binaryClasses = new HashMap();
  	private final Map  _unknownClasses = new HashMap();
  	private> final Map  _packages = new HashMap();
  	private final Set  _sourceSets = new HashSet();
  
  	/***
  	 * This map contains all the classes that were passed in the source sets,
  	 * excluding all inner classes.
  	 */
  	private final Map  _sourceSetSourceClasses = new HashMap();
  
  	/***
  	 * This map contains the same classes as _sourceSetSourceClasses, but it is
  	 * also populated with additional classes that may be accessed that were not in
  	 * the source sets. This can be superclasses, classes referenced in methods,
  	 * import statements etc.
  	 */
  	private final Map  _allSourceClasses = new HashMap();
  
  	private final Set  _sourceSetClassNames = new TreeSet();
  
  	private final Map  _properties = new HashMap();
  
  	private final Map  _abstractFileClasses = new HashMap();
  
      private final XTagFactory _tagFactory = new XTagFactory();
  
  	/***
  	 * This map contains all the classes that were passed in the source sets,
  	 * including all inner classes.
  	 */
  	private Collection _sourceSetSourceClassesWithInnerClasses = new ArrayList();
  
  	/***
  	 * Remember when we're born. We hate sources that are born after us and we
  	 * pretend they don't exist, because if we don't we'll have very unpredictable
  	 * behaviour. Well, since we have editor plugin and this is singleton object,
  	 * we have to relax our policy on this. Or we will have to restart editor every
  	 * time we like to tag the same class again...
  	 */
  	private long       _birthday;
  
  	/***
  	 * info, error and warning messages related to parsing and class qualification
  	 */
  	private List       _logMessages = new LinkedList();
  
 	/***
 	 * sticky parameter for useNodeParser. _useNodeParser = true -> slower parsing,
 	 * but modifiable javaodcs.
 	 */
 	private boolean    _useNodeParser = false;
 
 	/*** charset for source file */
 	private String _encoding = null;
 	
 	/*** charset for generated file */
 	private String _docEncoding = null;
 	
 	public XJavaDoc()
 	{
 		_birthday = System.currentTimeMillis();
         for( int i = 0; i < PRIMITIVES.size(); i += 2 )
         {
             addPrimitive( ( String ) PRIMITIVES.get( i ), ( String ) PRIMITIVES.get( i + 1 ) );
         }
 	}
 
 	/***
 	 * Dump to sytem out the status of XJavadoc.
 	 */
 	public static void printMemoryStatus()
 	{
 		System.out.println( "ParameterImpl instances:   " + ParameterImpl.instanceCount );
 		System.out.println( "MethodImpl instances:      " + MethodImpl.instanceCount );
 		System.out.println( "ConstructorImpl instances: " + ConstructorImpl.instanceCount );
 		System.out.println( "SimpleNode instances:      " + SimpleNode.instanceCount );
 		System.out.println( "SourceClass instances:     " + SourceClass.instanceCount );
 		System.out.println( "XDoc instances:            " + XDoc.instanceCount );
 		System.out.println( "DefaultXTag instances:     " + DefaultXTag.instanceCount );
 		System.out.println( "BinaryClass instances:     " + BinaryClass.instanceCount );
 		System.out.println( "UnknownClass instances:    " + UnknownClass.instanceCount );
 
 		System.out.println( "Total memory:    " + ( Runtime.getRuntime().totalMemory() / ( 1024 * 1024 ) ) );
 		System.out.println( "Free memory:    " + Runtime.getRuntime().freeMemory() / ( 1024 * 1024 ) );
 	}
 
 	/***
 	 * Replaces <code>${xxx}</code> style constructions in the given value with the
 	 * string value of the corresponding data types. NOTE: This method was taken
 	 * directly from Ant's source code (org.apache.tools.ant.ProjectHelper) and
 	 * modified slightly to use a Map instead of a HashMap.
 	 *
 	 * @param value  The string to be scanned for property references. May be
 	 *      <code>null</code> , in which case this method returns immediately with
 	 *      no effect.
 	 * @param keys   Mapping (String to String) of property names to their values.
 	 *      Must not be <code>null</code>.
 	 * @return       the original string with the properties replaced, or <code>null</code>
 	 *      if the original string is <code>null</code>.
 	 */
 	public static String replaceProperties( String value, Map keys )
 	{
 		if( value == null )
 		{
 			return null;
 		}
 
 		ArrayList fragments = new ArrayList();
 		ArrayList propertyRefs = new ArrayList();
 
 		parsePropertyString( value, fragments, propertyRefs );
 
 		StringBuffer sbuf = new StringBuffer();
 		Iterator i = fragments.iterator();
 		Iterator j = propertyRefs.iterator();
 
 		while( i.hasNext() )
 		{
 			String fragment = ( String ) i.next();
 
 			if( fragment == null )
 			{
 				String propertyName = ( String ) j.next();
 
 				fragment = ( keys.containsKey( propertyName ) ) ? ( String ) keys.get( propertyName )
 					 : "${" + propertyName + '}';
 			}
 			sbuf.append( fragment );
 		}
 
 		return sbuf.toString();
 	}
 
 	/***
 	 * Parses a string containing <code>${xxx}</code> style property references
 	 * into two lists. The first list is a collection of text fragments, while the
 	 * other is a set of string property names. <code>null</code> entries in the
 	 * first list indicate a property reference from the second list. NOTE: This
 	 * method was taken directly from Ant's source code
 	 * (org.apache.tools.ant.ProjectHelper) with the BuildException throwing
 	 * removed.
 	 *
 	 * @param value         Text to parse. Must not be <code>null</code>.
 	 * @param fragments     List to add text fragments to. Must not be <code>null</code>
 	 *      .
 	 * @param propertyRefs  List to add property names to. Must not be <code>null</code>
 	 */
 	public static void parsePropertyString( String value, List fragments, List propertyRefs )
 	{
 		int prev = 0;
 		int pos;
 
 		while( ( pos = value.indexOf( '$', prev ) ) >= 0 )
 		{
 
 			if( pos > 0 )
 			{
 				String fragment = value.substring( prev, pos );
 
 				fragments.add( fragment );
 			}
 
 			if( pos == ( value.length() - 1 ) )
 			{
 				fragments.add( "$" );
 				prev = pos + 1;
 			}
 			else if( value.charAt( pos + 1 ) != '{' )
 			{
 				fragments.add( value.substring( pos, pos + 1 ) );
 				prev = pos + 1;
 			}
 			else
 			{
 				int endName = value.indexOf( '}', pos );
 
 				if( endName < 0 )
 				{
 					// In Ant this is a BuildException condition as its an
 					// incomplete property reference. Here we'll leave it
 					// in the output string
 					String fragment = value.substring( pos );
 
 					fragments.add( fragment );
 					continue;
 				}
 
 				String propertyName = value.substring( pos + 2, endName );
 
 				fragments.add( null );
 				propertyRefs.add( propertyName );
 				prev = endName + 1;
 			}
 		}
 
 		if( prev < value.length() )
 		{
 			String fragment = value.substring( prev );
 
 			fragments.add( fragment );
 		}
 	}
 
 	/***
 	 * Gets the Primitive attribute of the XJavaDoc class
 	 *
 	 * @param name  Describe what the parameter does
 	 * @return      The Primitive value
 	 */
 	static Primitive getPrimitive( String name )
 	{
 		return ( Primitive ) _primitiveClasses.get( name );
 	}
 
 	/***
 	 * Gets the file the pe is contained in. Note: calling this method with a
 	 * XProgramElement not from source (but from a binary or unknown class) will
 	 * result in a ClassCastException, so don't do that. This method is only used
 	 * for diagnostics in error reporting.
 	 *
 	 * @param pe  the program element we want the source for.
 	 * @return    the file the program element is contained in.
 	 */
 	static AbstractFile getSourceFileFor( XProgramElement pe )
 	{
 		SourceClass containingClass = null;
 
 		if( !( pe instanceof SourceClass ) )
 		{
 			// pe is a field, method or constructor. get the surrounding class
 			containingClass = ( SourceClass ) pe.getContainingClass();
 		}
 		else
 		{
 			containingClass = ( SourceClass ) pe;
 		}
 		// in case the class is an inner class, loop until we have the outermost.
 		while( containingClass.getContainingClass() != null )
 		{
 			containingClass = ( SourceClass ) containingClass.getContainingClass();
 		}
 		return containingClass.getFile();
 	}
 
 	/***
 	 * Describe the method
 	 *
 	 * @param name  Describe the method parameter
 	 * @param type  The feature to be added to the Primitive attribute
 	 */
 	private final void addPrimitive( String name, String type )
 	{
 		_primitiveClasses.put( name, new Primitive( this, name, type ) );
 	}
 
 	public Collection getSourceClasses( Predicate predicate )
 	{
 		return CollectionUtils.select( getSourceClasses(), predicate );
 	}
 
 	/***
 	 * @param useNodeParser
 	 * @param inner
 	 * @return   A Collection of XClass
 	 * @deprecated           Call setUseNodeParser() prior to parsing and call the
 	 *      no-arg getSourceClasses() or getSourceClasses(Predicate) with a
 	 *      Predicate that doesn't accept inner classes.
 	 */
 	public Collection getSourceClasses( boolean useNodeParser, boolean inner )
 	{
 		if( inner )
 		{
 			return getSourceClasses();
 		}
 		else
 		{
 			return getSourceClasses( new NoInnerClassesPredicate() );
 		}
 	}
 
 	/***
 	 * @param useNodeParser
 	 * @return   A Collection of XClass
 	 * @deprecated           Call setUseNodeParser() prior to parsing and call the
 	 *      no-arg getSourceClasses()
 	 */
 	public Collection getSourceClasses( boolean useNodeParser )
 	{
 		return getSourceClasses();
 	}
 
 	/***
 	 * Returns all classes in the registered source sets, including inner classes
 	 *
 	 * @return   A Collection of XClass
 	 */
 	public Collection getSourceClasses()
 	{
 		if( _sourceSetSourceClassesWithInnerClasses.isEmpty() )
 		{
 			// Add the regular classes
 			_sourceSetSourceClassesWithInnerClasses.addAll( getOuterSourceClasses() );
 
 			// Add inner classes
 			for( Iterator outers = getOuterSourceClasses().iterator(); outers.hasNext();  )
 			{
 				addInnerClassRecursive( (XClass) outers.next(), _sourceSetSourceClassesWithInnerClasses );
 			}
 		}
 		return Collections.unmodifiableCollection( _sourceSetSourceClassesWithInnerClasses );
 	}
 
 	/***
 	 * Returns the packages of the specified classes during parsing.
 	 *
 	 * @return   Describe the return value
 	 */
 	public Collection getSourcePackages()
 	{
 		Set packages = new TreeSet();
 		Collection classes = getSourceClasses();
 
 		for( Iterator i = classes.iterator(); i.hasNext();  )
 		{
 			packages.add( ((XClass)i.next()).getContainingPackage() );
 		}
 
 		returng> Collections.unmodifiableCollection( packages );
 	}
 
 	public Map getPropertyMap()
 	{
 		return Collections.unmodifiableMap( _properties );
 	}
 
 	/***
 	 * Get the XClass corresponding to the qualifiedName. This can be a class from
 	 * source, a precompiled class or a primitive. UnknownClass is never returned
 	 * from this method, unless it has been previously instantiated. <b>IMPORTANT:
 	 * </b> If the Java source can be located, an instance of SourceClass will be
 	 * returned. -Even if that file was not among the files in the fileset or
 	 * sourceset. <b>IMPORTANT: </b> If qualifiedName represents an inner class, an
 	 * UnknownClass will be returned unless the enclousing "outer" class has been
 	 * resolved first.
 	 *
 	 * @param qualifiedName  Fully qualified class name
 	 * @return               The XClass value
 	 */
 	public XClass getXClass( String qualifiedName )
 	{
 		if( qualifiedName.equals( "" ) )
 		{
 			throw new IllegalStateException( "Classname can't be empty String" );
 		}
 
 		XClass result = null;
 		Primitive primitive;
 		SourceClass sourceClass;
 		BinaryClass binaryClass;
 		UnknownClass unknownClass;
 
 		// first, check all caches
 		if( ( primitive = getPrimitive( qualifiedName ) ) != null )
 		{
 			result = primitive;
 		}
 		else if( ( sourceClass = ( SourceClass ) _allSourceClasses.get( qualifiedName ) ) != null )
 		{
 			result = sourceClass;
 		}
 		else if( ( binaryClass = ( BinaryClass ) _binaryClasses.get( qualifiedName ) ) != null )
 		{
 			result = binaryClass;
 		}
 		else if( ( unknownClass = ( UnknownClass ) _unknownClasses.get( qualifiedName ) ) != null )
 		{
 			result = unknownClass;
 		}
 		else
 		{
 			// Let's try to read the class from source
 			if( sourceExists( qualifiedName ) )
 			{
 				// The source exists. Let's parse it.
 				sourceClass = scanAndPut( qualifiedName );
 				result = sourceClass;
 			}
 			else
 			{
 				// Couldn't find the class among the sources.
 				// Try a BinaryClass
 				Class clazz = getClass( qualifiedName );
 
 				if( clazz != null )
 				{
 					binaryClass = new BinaryClass( this, clazz );
 					_binaryClasses.put( qualifiedName, binaryClass );
 					result = binaryClass;
 				}
 				else
 				{
 					// Binary didn't exist either. Return an UnknownClass
 					result = new UnknownClass( this, qualifiedName );
 					_unknownClasses.put( qualifiedName, result );
 				}
 			}
 		}
 		return result;
 	}
 
 	/***
 	 * Returns the package. The package must be one of the packages of the sources.
 	 * Other packages, such as java.lang are not available.
 	 *
 	 * @param packageName
 	 * @return             an XPackage, or null if the packageName is not among the
 	 *      sources.
 	 */
 	publicXPackage getSourcePackage( String packageName )/package-summary.html">> XPackage getSourcePackage( String packageName )
 	{
 		// This is not optimal, but this method is primarily used for testing.
 		for( Iterator i = getSourcePackages().iterator(); i.hasNext();  )
 		{
 			XPackage p = ( XPackage ) i.next();
 
 			ifg>( p.getName().equals( packageName ) )
 			{
 				return p;
 			}
 		}
 		return null;
 	}
 
 	/***
 	 * This method can be called prior to parsing so that all classes are parsed
 	 * with AST (to make it possible to write the source back to disk)
 	 *
 	 * @param useNodeParser
 	 */
 	public void setUseNodeParser( boolean useNodeParser )
 	{
 		_useNodeParser = useNodeParser;
 	}
 
 	public void setPropertyMap( Map properties )
 	{
 		_properties.putAll( properties );
 	}
 
 	/***
 	 * Resets the caches. Same as calling <code>reset(true)</code>.
 	 *
 	 * @deprecated   use reset(boolean).
 	 */
 	public void reset()
 	{
 		reset( true );
 	}
 
 	/***
 	 * Resets the caches.
 	 *
 	 * @param resetTimeStamp  true if timestamps should be reset too.
 	 */
 	public void reset( boolean resetTimeStamp )
 	{
 		for( Iterator iterator =  _packages.values().iterator(); iterator.hasNext();  )
 		{
 			XPackage xPackage = (XPackage) iterator.next();
 
 			for( Iterator i = xPackage.getClasses().iterator(); i.hasNext();  )
 			{
 				AbstractClass clazz = ( AbstractClass ) i.next();
 
 				clazz.reset();
 			}
 		}
 		_binaryClasses.clear();
 		_unknownClasses.clear();
 		_packages.clear();
 		_sourceSets.clear();
 		_sourceSetSourceClasses.clear();
 		_sourceSetClassNames.clear();
 		_allSourceClasses.clear();
 		_sourceSetSourceClassesWithInnerClasses.clear();
 
 		_logMessages.clear();
 		_properties.clear();
 		_abstractFileClasses.clear();
 
 		//_primitiveClasses = null;
 
 		//AbstractProgramElement.NULL_XDOC = null;
 
 		// if we start new life, we can as well get new birth certificate,
 		// so classes saved in previous life can be loaded again without
 		// hating them :)
 		if( resetTimeStamp )
 		{
 			_birthday = System.currentTimeMillis();
 		}
 	}
 
 	/***
 	 * Prints the log messages encountered during parsing
 	 *
 	 * @param out
 	 * @param level
 	 */
 	public void printLogMessages( PrintStream out, int level )
 	{
 		boolean printedHeader = false;
 
 		for( Iterator i = _logMessages.iterator(); i.hasNext();  )
 		{
 			LogMessage m = ( LogMessage ) i.next();
 
 			if( m._level == level )
 			{
 				if( !printedHeader )
 				{
 					if( level == ONE_OR_MORE_IMPORTED_PACKAGES )
 					{
 						// Could be an inner class too!!!
 						out.println( "WARNING: Some classes refer to other classes that were not found among the sources or on the classpath." );
 						out.println( "         (Perhaps the referred class doesn't exist? Hasn't been generated yet?)" );
 						out.println( "         The referring classes do not import any fully qualified classes matching these classes." );
 						out.println( "         Since at least one package is imported, it is impossible for xjavadoc to figure out" );
 						out.println( "         what package the referred classes belong to. The classes are:" );
 					}
 					else
 					{
 						out.println( "INFO:    Some classes refer to other classes that were not found among the sources or on the classpath." );
 						out.println( "         (Perhaps the referred class doesn't exist? Hasn't been generated yet?)" );
 						out.println( "         The referring classes do not import any fully qualified classes matching these classes." );
 						out.println( "         However, since no packages are imported, xjavadoc has assumed that the referred classes" );
 						out.println( "         belong to the same package as the referring class. The classes are:" );
 					}
 					printedHeader = true;
 				}
 				out.println( m._sourceClass.getFile().getPath() + " --> " + m._unqualifiedClassName + " qualified to " + m._unknownClass.getQualifiedName() );
 			}
 		}
 	}
 
 	/***
 	 * Adds a new set of java sources to be parsed.
 	 *
 	 * @param sourceSet  a set of java sources.
 	 */
 	public void addSourceSet( SourceSet sourceSet )
 	{
 		_sourceSets.add( sourceSet );
 		for( int j = 0; j < sourceSet.getSize(); j++ )
 		{
 			String qualifiedName = sourceSet.getQualifiedName( j );
 
 			if( _sourceSetClassNames.contains( qualifiedName ) )
 			{
 				String msg = "The class \"" + qualifiedName + "\" occurs in more than one fileset. That's illegal.";
 
 				System.err.println( msg );
 			}
 			_sourceSetClassNames.add( qualifiedName );
 		}
 	}
 
 	public void addAbstractFile( String qualifiedName, AbstractFile file )
 	{
 		_abstractFileClasses.put( qualifiedName, file );
 
 		if( _sourceSetClassNames.contains( qualifiedName ) )
 		{
 			String msg = "The class \"" + qualifiedName + "\" occurs in more than one fileset. That's illegal.";
 
 			System.err.println( msg );
 		}
 		_sourceSetClassNames.add( qualifiedName );
 	}
 
 	/***
 	 * Describe what the method does
 	 *
 	 * @param className                qualified name of class
 	 * @param tagName                  tag name
 	 * @param parameterName            parameter name
 	 * @param parameterValue           new parameter value
 	 * @param tagIndex                 index of tag (??)
 	 * @param methodNameWithSignature  method name followed by signature. no
 	 *      spaces. Ex:<br>
 	 *      <code>doIt(java.lang.String,int)</code>
 	 * @return                         the class corresponding to the className
 	 * @exception XJavaDocException    If the tag for some reason couldn't be
 	 *      updated
 	 */
 	public XClass updateMethodTag(
 		String className,
 		String methodNameWithSignature,
 		String tagName,
 		String parameterName,
 		String parameterValue,
 		int tagIndex
 		 ) throws XJavaDocException
 	{
 		XClass clazz = getXClass( className );
 		XMethod method = clazz.getMethod( methodNameWithSignature );
 
 		XDoc doc = method.getDoc();
 
 		doc.updateTagValue( tagName, parameterName, parameterValue, tagIndex );
 
 		return clazz;
 	}
 
 	/***
 	 * Describe what the method does
 	 *
 	 * @param className              Describe what the parameter does
 	 * @param tagName                Describe what the parameter does
 	 * @param parameterName          Describe what the parameter does
 	 * @param parameterValue         Describe what the parameter does
 	 * @param tagIndex               Describe what the parameter does
 	 * @return                       Describe the return value
 	 * @exception XJavaDocException  Describe the exception
 	 */
 	public XClass updateClassTag(
 		String className,
 		String tagName,
 		String parameterName,
 		String parameterValue,
 		int tagIndex
 		 ) throws XJavaDocException
 	{
 		XClass clazz = getXClass( className );
 		XDoc doc = clazz.getDoc();
 
 		doc.updateTagValue( tagName, parameterName, parameterValue, tagIndex );
 		return clazz;
 	}
 
 	public String dereferenceProperties( String value )
 	{
 
 		return replaceProperties( value, _properties );
 	}
 
 	/***
 	 * @param qualifiedClassName
 	 * @return                    true if the class exists, either as source or
 	 *      binary
 	 */
 	final boolean classExists( final String qualifiedClassName )
 	{
 		// See if we have the source
 		if( sourceExists( qualifiedClassName ) )
 		{
 			return true;
 		}
 		// See if we kand find the class (binary)
 		else if( getClass( qualifiedClassName ) != null )
 		{
 			return true;
 		}
 		else
 		{
 			return false;
 		}
 	}
 
 	void logMessage( SourceClass clazz, UnknownClass unknownClass, String unqualifiedClassName, int level )
 	{
 		_logMessages.add( new LogMessage( clazz, unknownClass, unqualifiedClassName, level ) );
 	}
 
 	/***
 	 * Describe the method
 	 *
 	 * @param packageName  Describe the method parameter
 	 * @return             Describe the return value
 	 */
 	XPackage addPackageMaybe( String packageName )
 	{
 		XPackage result = ( XPackage ) _packages.get( packageName );
 
 		if( result == null )
 		{
 			// The package doesn't exist yet. Add it then
 			resXPackage( packageName )/package-summary.html">ult = new XPackage( packageName );
 			_packages.put( packageName, result );
 		}
 		return result;
 	}
 
 	/***
 	 * Adds a source class to the cache. This method is also called from JavaParser
 	 * when parsing inner classes.
 	 *
 	 * @param sourceClass  Describe the method parameter
 	 */
 	void addSourceClass( SourceClass sourceClass )
 	{
 		_allSourceClasses.put( sourceClass.getQualifiedName(), sourceClass );
 
 		// Also add it to _sourceSetSourceClasses if it was among the source sets
 		// or if it is an "extra" class (this is due to XJD-8)
 		if( _sourceSetClassNames.contains( sourceClass.getQualifiedName() ) || sourceClass.isExtraClass() )
 		{
 			_sourceSetSourceClasses.put( sourceClass.getQualifiedName(), sourceClass );
 		}
 	}
 
 	/***
 	 * Returns the Class with the given name, or null if unknown.
 	 *
 	 * @param qualifiedName  Describe what the parameter does
 	 * @return               The Class value
 	 */
 	private final Class getClass( String qualifiedName )
 	{
 		try
 		{
 			return Class.forName( qualifiedName, false, getClass().getClassLoader() );
 		}
 		catch( Throwable e )
 		{
 			// e can be LinkageError, ClassNotFoundException or ExceptionInInitializerError
 			// We don't care what we get. If the forName fails, we don't have a class to return
 			return null;
 		}
 	}
 
 	/***
 	 * Returns all classes in the registered source sets
 	 *
 	 * @return   A Collection of XClass
 	 */
 	private Collection getOuterSourceClasses()
 	{
 		if( _sourceSetSourceClasses.isEmpty() )
 		{
 			for( Iterator i = _sourceSetClassNames.iterator(); i.hasNext();  )
 			{
 				String qualifiedName = ( String ) i.next();
 
 				/*
 				 * This will result in the class being added to
 				 * _sourceSetSourceClasses AND _allSourceClasses
 				 */
 				getXClass( qualifiedName );
 			}
 
 			for( Iterator iterator = _abstractFileClasses.keySet().iterator(); iterator.hasNext();  )
 			{
 				String fqcn = ( String ) iterator.next();
 
 				getXClass( fqcn );
 			}
 		}
 
 		//a new collection should be created, becuase we might be looping over classes and generatePerClass for each
 		//one, now if a new class is discovered and registered (maybe we are analyzing a new class, maybe a template
 		//is now interested in superclass of a class, maybe ...), we'll get a ConcurrentModificationException. To prevent
 		//it we need to looping over a new collection (initiated from XJavaDoc mostly).
 		Collection new_collection = new ArrayList( _sourceSetSourceClasses.values() );
 
 		return Collections.unmodifiableCollection( new_collection );
 	}
 
 	/***
 	 * Gets the SourceFile attribute of the XJavaDoc object
 	 *
 	 * @param qualifiedName  Describe what the parameter does
 	 * @return               The SourceFile value
 	 */
 	private AbstractFile getSourceFile( String qualifiedName )
 	{
 		// loop over all SourceSets. If a source is found more than once -> bang!
 		AbstractFile found = null;
 
 		for( Iterator i = _sourceSets.iterator(); i.hasNext();  )
 		{
 			SourceSet sourceSet = ( SourceSet ) i.next();
 			AbstractFile javaFile = sourceSet.getSourceFile( qualifiedName );
 
 			if( javaFile != null )
 			{
 				// isn't this an impossible situation?  Have a look at addSourceSet - we check
 				// there to ensure that no classes are added twice.....
 //				if( found != null && !found.getAbsolutePath().equals( javaFile.getAbsolutePath() ) )
 //				{
 //					throw new IllegalStateException( "Ambiguous sources for " + qualifiedName + " : " + found.getAbsolutePath() + " or " + javaFile.getAbsolutePath() );
 //				}
 				found = javaFile;
 			}
 		}
 		return found;
 	}
 
 	/***
 	 * Recursively adds inner classes to a collection
 	 *
 	 * @param outer  The feature to be added to the InnerClassRecursive attribute
 	 * @param c      The feature to be added to the InnerClassRecursive attribute
 	 */
 	private void addInnerClassRecursive( XClass outer, Collection c )
 	{
 		for( Iterator inners = outer.getInnerClasses().iterator(); inners.hasNext();  )
 		{
 			XClass inner = (XClass) inners.next();
 
 			c.add( inner );
 			addInnerClassRecursive( inner, c );
 		}
 	}
 
 	/***
 	 * Checks is the source exists
 	 *
 	 * @param qualifiedName  the class to check for
 	 * @return               true if source exists.
 	 */
 	private boolean sourceExists( String qualifiedName )
 	{
 		/*
 		 * When used with XDoclet, some classes might be resolved by xjavadoc
 		 * after they are generated by XDoclet.
 		 * (An example is e.g. a primary key
 		 * class that doesn't exist before XDoclet is run, and which might be
 		 * referenced by some of the methods in the @tagged classes).
 		 * We will pretend that any classes that didn't exist before xjavadoc started
 		 * scanning sources (generated classes) don't exist. This is to avoid modifying
 		 * collections that are being iterated over in parallel, as this will throw
 		 * ConcurrentModificationException. (Aslak)
 		 */
 		AbstractFile sourceFile = getSourceFile( qualifiedName );
 
 		if( sourceFile != null )
 		{
 			if( sourceFile.lastModified() > _birthday )
 			{
 				// The source appeared after xjavadoc was reset. Pretend it doesn't exist.
 				System.out.println( "XJavaDoc Ignoring class " + qualifiedName + " in " + sourceFile.getPath() + ". It was generated (" + new Date( sourceFile.lastModified() ) + ") after XJavaDoc's timestamp was reset (" + new Date( _birthday ) + ")" );
 				return false;
 			}
 		}
 
 		boolean sourceFileExists = sourceFile != null;
 
 		if( !sourceFileExists )
 		{
 			sourceFileExists = _abstractFileClasses.containsKey( qualifiedName );
 		}
 
 		return sourceFileExists;
 	}
 
 	/***
 	 * Scan's a class and puts it in the cache.
 	 *
 	 * @param qualifiedName  Describe what the parameter does
 	 * @return               Describe the return value
 	 */
 	private SourceClass scanAndPut( String qualifiedName )
 	{
 		AbstractFile sourceFile = getSourceFile( qualifiedName );
 
 		sourceFile = sourceFile != null ? sourceFile : ( AbstractFile ) _abstractFileClasses.get( qualifiedName );
 
 		if( sourceFile == null )
 		{
 			throw new IllegalStateException( "No source found for " + qualifiedName );
 		}
 
 		SourceClass sourceClass = new SourceClass( this, sourceFile, _useNodeParser, _tagFactory ,_encoding);
 
 		// now that the entire file is parsed, validate the tags.
 		if( _tagFactory.isValidating() )
 		{
 			sourceClass.validateTags();
 		}
 
 //		addSourceClass( sourceClass );
 
 		return sourceClass;
 	}
 
     public XTagFactory getTagFactory() {
         return _tagFactory;
     }
 
     /***
      * Registers tags.
      *
      * @param classpath where tags are found.
      */
     public void registerTags( String classpath ) {
         new TagIntrospector().registerTags( classpath, getTagFactory() );
     }
 
 	public final static class NoInnerClassesPredicate implements Predicate
 	{
 		public boolean evaluate( Object o )
 		{
 			XClass clazz = ( XClass ) o;
 
 			return !clazz.isInner();
 		}
 	}
 
 	class LogMessage
 	{
 		public final SourceClass _sourceClass;
 		public final UnknownClass _unknownClass;
 		public final String _unqualifiedClassName;
 		public final int  _level;
 		LogMessage( SourceClass sourceClass, UnknownClass unknownClass, String unqualifiedClassName, int level )
 		{
 			_sourceClass = sourceClass;
 			_unknownClass = unknownClass;
 			_unqualifiedClassName = unqualifiedClassName;
 			_level = level;
 		}
 	}
 
 	/***
 	 * Getter for source file charset.
 	 * @return encoding
 	 */
 	public String getEncoding() {
 		return _encoding;
 	}
 
 	/***
 	 * Setter for source file charset.
 	 * @param string encoding
 	 */
 	public void setEncoding(String encoding) {
 		_encoding = encoding;
 	}
 
 	/***
 	 * Getter for generated file charset.
 	 * @return encoding
 	 */
 	public String getDocEncoding() {
 		return _docEncoding;
 	}
 
 	/***
 	 * Setter for generated file charset.
 	 * @param string encoding 
 	 */
 	public void setDocEncoding(String docencoding) {
 		_docEncoding = docencoding;
 	}
 
 }