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1: /* ======================================================================== 2: * JCommon : a free general purpose class library for the Java(tm) platform 3: * ======================================================================== 4: * 5: * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors. 6: * 7: * Project Info: http://www.jfree.org/jcommon/index.html 8: * 9: * This library is free software; you can redistribute it and/or modify it 10: * under the terms of the GNU Lesser General Public License as published by 11: * the Free Software Foundation; either version 2.1 of the License, or 12: * (at your option) any later version. 13: * 14: * This library is distributed in the hope that it will be useful, but 15: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 17: * License for more details. 18: * 19: * You should have received a copy of the GNU Lesser General Public 20: * License along with this library; if not, write to the Free Software 21: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 22: * USA. 23: * 24: * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 25: * in the United States and other countries.] 26: * 27: * ------------------ 28: * FileUtilities.java 29: * ------------------ 30: * (C) Copyright 2000-2004, by Object Refinery Limited. 31: * 32: * Original Author: David Gilbert (for Object Refinery Limited); 33: * Contributor(s): -; 34: * 35: * $Id: FileUtilities.java,v 1.5 2005/10/18 13:16:02 mungady Exp $ 36: * 37: * Changes (from 5-Nov-2001) 38: * ------------------------- 39: * 05-Nov-2001 : Changed package to com.jrefinery.io.* (DG); 40: * 04-Mar-2002 : Renamed Files.java --> FileUtilities.java (DG); 41: * 10-Oct-2002 : Fixed errors reported by Checkstyle (DG); 42: * 43: */ 44: 45: package org.jfree.io; 46: 47: import java.io.File; 48: import java.util.StringTokenizer; 49: 50: /** 51: * A class containing useful utility methods relating to files. 52: * 53: * @author David Gilbert 54: */ 55: public class FileUtilities { 56: 57: /** 58: * To prevent unnecessary instantiation. 59: */ 60: private FileUtilities() { 61: } 62: 63: /** 64: * Returns a reference to a file with the specified name that is located 65: * somewhere on the classpath. The code for this method is an adaptation 66: * of code supplied by Dave Postill. 67: * 68: * @param name the filename. 69: * 70: * @return a reference to a file or <code>null</code> if no file could be found. 71: */ 72: public static File findFileOnClassPath(final String name) { 73: 74: final String classpath = System.getProperty("java.class.path"); 75: final String pathSeparator = System.getProperty("path.separator"); 76: 77: final StringTokenizer tokenizer = new StringTokenizer(classpath, pathSeparator); 78: 79: while (tokenizer.hasMoreTokens()) { 80: final String pathElement = tokenizer.nextToken(); 81: 82: final File directoryOrJar = new File(pathElement); 83: final File absoluteDirectoryOrJar = directoryOrJar.getAbsoluteFile(); 84: 85: if (absoluteDirectoryOrJar.isFile()) { 86: final File target = new File(absoluteDirectoryOrJar.getParent(), name); 87: if (target.exists()) { 88: return target; 89: } 90: } 91: else { 92: final File target = new File(directoryOrJar, name); 93: if (target.exists()) { 94: return target; 95: } 96: } 97: 98: } 99: return null; 100: 101: } 102: 103: }