add listFiles and isFile methods to java.io.File

classpath/java-io.cpp

@@ -305,6 +305,21 @@ Java_java_io_File_isDirectory(JNIEnv* e, jclass, jstring path)
   }
 }
 
+extern "C" JNIEXPORT jboolean JNICALL
+Java_java_io_File_isFile(JNIEnv* e, jclass, jstring path)
+{
+  const char* chars = e->GetStringUTFChars(path, 0);
+  if (chars) {
+    STRUCT_STAT s;
+    int r = STAT(chars, &s);
+    bool v = (r == 0 and S_ISREG(s.st_mode));
+    e->ReleaseStringUTFChars(path, chars);
+    return v;
+  } else {
+    return false;
+  }
+}
+
 extern "C" JNIEXPORT jboolean JNICALL
 Java_java_io_File_exists(JNIEnv* e, jclass, jstring path)
 {

classpath/java/io/File.java

@@ -41,6 +41,12 @@ public class File {
     return isDirectory(path);
   }
 
+  private static native boolean isFile(String path);
+
+  public boolean isFile() {
+    return isFile(path);
+  }
+
   public String getName() {
     int index = path.lastIndexOf(FileSeparator);
     if (index >= 0) {
@@ -141,6 +147,19 @@ public class File {
     return mkdir();
   }
 
+  public File[] listFiles() {
+    return listFiles(null);
+  }
+
+  public File[] listFiles(FilenameFilter filter) {
+    String[] list = list(filter);
+    File[] result = new File[list.length];
+    for (int i = 0; i < list.length; ++i) {
+      result[i] = new File(this, list[i]);
+    }
+    return result;
+  }
+
   public String[] list() {
     return list(null);
   }