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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;
}
}
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