ClassnameFilter.java

/*
 * @(#)ClassnameFilter.java	1.12 06/10/10
 *
 * Copyright  1990-2008 Sun Microsystems, Inc. All Rights Reserved.  
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER  
 *   
 * This program is free software; you can redistribute it and/or  
 * modify it under the terms of the GNU General Public License version  
 * 2 only, as published by the Free Software Foundation.   
 *   
 * This program is distributed in the hope that it will be useful, but  
 * WITHOUT ANY WARRANTY; without even the implied warranty of  
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU  
 * General Public License version 2 for more details (a copy is  
 * included at /legal/license.txt).   
 *   
 * You should have received a copy of the GNU General Public License  
 * version 2 along with this work; if not, write to the Free Software  
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  
 * 02110-1301 USA   
 *   
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa  
 * Clara, CA 95054 or visit www.sun.com if you need additional  
 * information or have any questions. 
 *
 */

package util;

import java.util.Hashtable;

/*
 * A ClassnameFilter is a pretty simple instance of a FilenameFilter.
 * It is used for processing command-line options which involve
 * lists of sets of classes. It understands a single trailing * in
 * a name to mean all the classes in a package.
 */

public
class ClassnameFilter implements java.io.FilenameFilter {

    boolean	includeAll	= false;
    boolean	conditional;

    Hashtable	includedClass   = new Hashtable(); // string class names
    Hashtable	includedPackage = new Hashtable();  // string package names

    public ClassnameFilter( boolean conditional ){
	this.conditional = conditional;
    }

    public ClassnameFilter( ){
	this(false);
    }

    public void includeClass( String className ){
	includedClass.put( className, className );
    }

    public void includePackage( String packageName ){
	if ( packageName == null || (packageName.length() == 0 ) )
	    includeAll = true;
	else
	    includedPackage.put( packageName, packageName );
    }

    /*
     * To include a class or package named by the given string.
     * If it ends in *, we treat it as a package name.
     * otherwise, it is a class.
     */
    public void
    includeName( String classname ){
	if ( classname.charAt( classname.length()-1 ) == '*' ){
	    // this is a package name, not a class name
	    // strip off trailing junk and put it on the included package
	    // list.
	    int pkgLength = classname.lastIndexOf( '/' );
	    if ( pkgLength < 0 )
		includePackage( null );
	    else
		includePackage( classname.substring(  0, pkgLength ) );
	} else {
	    includeClass( classname );
	}
    }


    public boolean accept( java.io.File dir, String className ){
	if ( includedClass.get( className ) != null ){
	    return true;
	} else if (includeAll) {
	    return true;
	} else {
	    String pkgName = className;
	    int pkgLength = className.lastIndexOf('/');
	    // look at immediate package, and superpackage, and ...
	    while ( pkgLength > 0 ){
		pkgName = pkgName.substring( 0, pkgLength );
		if ( includedPackage.get( pkgName ) != null ){
		    return true; 
		}
		pkgLength = pkgName.lastIndexOf('/');
	    }
	}
	return false;
    }
}