1 files changed, 136 insertions, 0 deletions
diff --git a/libjava/gnu/gcj/util/path/DirectoryPathEntry.java b/libjava/gnu/gcj/util/path/DirectoryPathEntry.java
new file mode 100644
index 00000000000..a9ca602341b
--- /dev/null
+++ b/libjava/gnu/gcj/util/path/DirectoryPathEntry.java
@@ -0,0 +1,136 @@
+// DirectoryPathEntry.java -- search path element for directories
+
+/* Copyright (C) 1999  Cygnus Solutions
+
+   This file is part of libgcj.
+
+This software is copyrighted work licensed under the terms of the
+Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
+details.  */
+
+/* Author: Kresten Krab Thorup <krab@gnu.org>  */
+
+package gnu.gcj.util.path;
+
+import java.util.*;
+import java.util.zip.*;
+import java.io.*;
+import java.net.*;
+
+final class DirectoryPathEntry extends PathEntry
+{
+  final File dir;
+  final String base_canon;
+
+  public String toString () { return base_canon; }
+
+  DirectoryPathEntry (File f)
+    throws java.io.IOException
+  {
+    if (!f.isAbsolute ())
+      throw new IllegalArgumentException ();
+
+    dir = f; 
+    base_canon = dir.getCanonicalPath ();
+  }
+
+  /*
+   *  We maintain a cache of files, so that we 
+   *  can avoid many calls to stat(), which are
+   *  very expensive.
+   *
+   *  seen_cache contains (as keys) the directories 
+   *  which we have visited so far.  The values are 
+   *  instances of CacheEntry, containing a time stamp,
+   *  and a list of files in that directory.
+   *
+   */
+
+  private Hashtable seen_cache = new Hashtable ();
+
+  private boolean in_cache (File f)
+  {
+    String rel_dir = f.getParent ();
+    CacheEntry ent;
+
+    if (rel_dir == null)
+      throw new IllegalArgumentException ();
+
+    ent = (CacheEntry) seen_cache.get (rel_dir);
+    if (ent == null)
+      {
+	ent = new CacheEntry (rel_dir);
+	seen_cache.put (rel_dir, ent);
+      }
+
+    if (ent.contains (f.getPath ()))
+      {
+	return true;
+      }
+
+    if ( ent.is_old () )
+      {
+	if (f.exists ())
+	  {
+	    seen_cache.remove (rel_dir);
+	    return true;
+	  }
+	else
+	  {
+	    ent.touch ();
+	  }
+      }
+
+    return false;
+  }
+
+  URL getURL (String file) {
+    try {
+      File f = new File((new File (dir, file).getCanonicalPath ()));
+	    
+      if (! f.getCanonicalPath ().startsWith (base_canon))
+	throw new IllegalArgumentException (file);
+
+		
+      if (in_cache (f))
+	return new URL ("file", "", f.getPath ());
+      else
+	return null;
+
+    } catch (IOException x) {
+      return null;
+    }
+  }
+
+  InputStream getStream (String file) {
+    try {			
+      File f = new File((new File (dir, file)).getCanonicalPath ());
+
+      if (! f.getCanonicalPath ().startsWith (base_canon))
+	throw new IllegalArgumentException (file);
+
+      if (in_cache (f))
+	return new FileInputStream (f);
+      else
+	return null;
+    } catch (IOException x) {
+      return null;
+    }
+  }
+
+  byte[] getBytes (String file) {
+    File f = new File (dir, file);
+
+    try {			
+      if (in_cache (f))
+	return readbytes (new FileInputStream (f),
+			  (int) f.length ());
+      else
+	return null;
+    } catch (IOException x) {
+      return null;
+    }
+  }
+
+}
+