001: /* ========================================================================
002: * JCommon : a free general purpose class library for the Java(tm) platform
003: * ========================================================================
004: *
005: * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
006: *
007: * Project Info: http://www.jfree.org/jcommon/index.html
008: *
009: * This library is free software; you can redistribute it and/or modify it
010: * under the terms of the GNU Lesser General Public License as published by
011: * the Free Software Foundation; either version 2.1 of the License, or
012: * (at your option) any later version.
013: *
014: * This library is distributed in the hope that it will be useful, but
015: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
016: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
017: * License for more details.
018: *
019: * You should have received a copy of the GNU Lesser General Public
020: * License along with this library; if not, write to the Free Software
021: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
022: * USA.
023: *
024: * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
025: * in the United States and other countries.]
026: *
027: * ------------------
028: * FileUtilities.java
029: * ------------------
030: * (C) Copyright 2000-2004, by Object Refinery Limited.
031: *
032: * Original Author: David Gilbert (for Object Refinery Limited);
033: * Contributor(s): -;
034: *
035: * $Id: FileUtilities.java,v 1.5 2005/10/18 13:16:02 mungady Exp $
036: *
037: * Changes (from 5-Nov-2001)
038: * -------------------------
039: * 05-Nov-2001 : Changed package to com.jrefinery.io.* (DG);
040: * 04-Mar-2002 : Renamed Files.java --> FileUtilities.java (DG);
041: * 10-Oct-2002 : Fixed errors reported by Checkstyle (DG);
042: *
043: */
044:
045: package org.jfree.io;
046:
047: import java.io.File;
048: import java.util.StringTokenizer;
049:
050: /**
051: * A class containing useful utility methods relating to files.
052: *
053: * @author David Gilbert
054: */
055: public class FileUtilities {
056:
057: /**
058: * To prevent unnecessary instantiation.
059: */
060: private FileUtilities() {
061: }
062:
063: /**
064: * Returns a reference to a file with the specified name that is located
065: * somewhere on the classpath. The code for this method is an adaptation
066: * of code supplied by Dave Postill.
067: *
068: * @param name the filename.
069: *
070: * @return a reference to a file or <code>null</code> if no file could be found.
071: */
072: public static File findFileOnClassPath(final String name) {
073:
074: final String classpath = System.getProperty("java.class.path");
075: final String pathSeparator = System
076: .getProperty("path.separator");
077:
078: final StringTokenizer tokenizer = new StringTokenizer(
079: classpath, pathSeparator);
080:
081: while (tokenizer.hasMoreTokens()) {
082: final String pathElement = tokenizer.nextToken();
083:
084: final File directoryOrJar = new File(pathElement);
085: final File absoluteDirectoryOrJar = directoryOrJar
086: .getAbsoluteFile();
087:
088: if (absoluteDirectoryOrJar.isFile()) {
089: final File target = new File(absoluteDirectoryOrJar
090: .getParent(), name);
091: if (target.exists()) {
092: return target;
093: }
094: } else {
095: final File target = new File(directoryOrJar, name);
096: if (target.exists()) {
097: return target;
098: }
099: }
100:
101: }
102: return null;
103:
104: }
105:
106: }
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