package org.kuali.common.util.file;
   
   import java.io.File;
   import java.io.IOException;
   import java.net.URI;
   
   /**
    * A <code>CanonicalFile</code> is always both absolute and unique.
    */
  public final class CanonicalFile extends File {
  
  	private static final long serialVersionUID = -8366640724070158688L;
  
  	/**
  	 * A <code>CanonicalFile</code> is always both absolute and unique.
  	 */
  	public CanonicalFile(File parent, String child) {
  		this(new File(parent, child));
  	}
  
  	/**
  	 * A <code>CanonicalFile</code> is always both absolute and unique.
  	 */
  	public CanonicalFile(String parent, String child) {
  		this(new File(parent, child));
  	}
  
  	/**
  	 * A <code>CanonicalFile</code> is always both absolute and unique.
  	 */
  	public CanonicalFile(URI uri) {
  		this(new File(uri));
  	}
  
  	/**
  	 * A <code>CanonicalFile</code> is always both absolute and unique.
  	 */
  	public CanonicalFile(String path) {
  		this(new File(path));
  	}
  
  	/**
  	 * A <code>CanonicalFile</code> is always both absolute and unique.
  	 */
  	public CanonicalFile(File file) {
  		super(getCanonicalPath(file));
  	}
  
  	/**
  	 * Return the current working directory.
  	 */
  	public static final CanonicalFile cwd() {
  		return new CanonicalFile(".");
  	}
  
  	protected static String getCanonicalPath(File file) {
  		try {
  			return file.getCanonicalPath();
  		} catch (IOException e) {
  			throw new IllegalStateException("unexpected io error", e);
  		}
  	}
  
  }