| package org.clearsilver; |
| |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.io.File; |
| |
| /** |
| * Utility class containing helper methods |
| * |
| * @author smarti@google.com (Sergio Marti) |
| */ |
| public class CSUtil { |
| |
| private CSUtil() { } |
| |
| public static final String HDF_LOADPATHS = "hdf.loadpaths"; |
| |
| /** |
| * Helper function that returns a concatenation of the loadpaths in the |
| * provided HDF. |
| * @param hdf an HDF structure containing load paths. |
| * @return A list of loadpaths in order in which to search. |
| * @throws NullPointerException if no loadpaths are found. |
| */ |
| public static List<String> getLoadPaths(HDF hdf) { |
| List<String> list = new LinkedList<String>(); |
| HDF loadpathsHdf = hdf.getObj(HDF_LOADPATHS); |
| if (loadpathsHdf == null) { |
| throw new NullPointerException("No HDF loadpaths located in the specified" |
| + " HDF structure"); |
| } |
| for (HDF lpHdf = loadpathsHdf.objChild(); lpHdf != null; |
| lpHdf = lpHdf.objNext()) { |
| list.add(lpHdf.objValue()); |
| } |
| return list; |
| } |
| |
| /** |
| * Given an ordered list of directories to look in, locate the specified file. |
| * Returns <code>null</code> if file not found. |
| * @param loadpaths the ordered list of paths to search. |
| * @param filename the name of the file. |
| * @return a File object corresponding to the file. <code>null</code> if |
| * file not found. |
| */ |
| public static File locateFile(List<String> loadpaths, String filename) { |
| if (filename == null) { |
| throw new NullPointerException("No filename provided"); |
| } |
| if (loadpaths == null) { |
| throw new NullPointerException("No loadpaths provided."); |
| } |
| for (String path : loadpaths) { |
| File file = new File(path, filename); |
| if (file.exists()) { |
| return file; |
| } |
| } |
| return null; |
| } |
| } |