corda/sgx-jvm/avian/test/Files.java

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

public class Files {
  private static final boolean IsWindows
    = System.getProperty("os.name").equals("Windows");

  private static void expect(boolean v) {
    if (! v) throw new RuntimeException();
  }
  
  private static void isAbsoluteTest(boolean absolutePath) {
    File file = new File("test.txt");
    if (absolutePath) {
      file = file.getAbsoluteFile();
    }
    
    boolean isAbsolute = file.isAbsolute();
    
    if (absolutePath) {
      expect(isAbsolute);
    } else {
      expect(!isAbsolute);
    }
    
  }

  private static void isRootParent() {
    if(!IsWindows) {
      File f = new File("/root");
      File f2 = f.getParentFile();
      System.out.println("------------"+f2);
      expect(f2.getPath().equals("/"));
    }
  }

  public static void main(String[] args) throws Exception {
    isAbsoluteTest(true);
    isAbsoluteTest(false);
    isRootParent();
  
    { File f = new File("test.txt");
      FileOutputStream out = new FileOutputStream(f);
      byte[] message = "hello, world!\n".getBytes("UTF-8");
      out.write(message);
      out.close();

      expect(f.lastModified() > 0);

      FileInputStream in = new FileInputStream(f);
      try {
        expect(in.available() == message.length);

        for (int i = 0; i < message.length; ++i) {
          in.read();
          expect(in.available() == message.length - i - 1);
        }
          
        expect(in.read() == -1);
        expect(in.available() == 0);
      } finally {
        in.close();
      }
    }

    if(IsWindows) {
      expect(new File("/c:\\test").getPath().equals("c:\\test"));
    } else {
      expect(new File("/c:\\test").getPath().equals("/c:\\test"));
    }

    expect(new File("foo/bar").getParent().equals("foo"));
    expect(new File("foo/bar/").getParent().equals("foo"));
    expect(new File("foo/bar//").getParent().equals("foo"));

    expect(new File("foo/nonexistent-directory").listFiles() == null);
  }

}