ch11: sample code

11-pythonic-obj/private/Confidential.java

@@ -0,0 +1,8 @@
+public class Confidential {
+
+    private String secret = "";
+
+    public Confidential(String text) {
+        secret = text.toUpperCase();
+    }
+}

11-pythonic-obj/private/Expose.java

@@ -0,0 +1,25 @@
+import java.lang.reflect.Field;
+
+public class Expose {
+
+    public static void main(String[] args) {
+        Confidential message = new Confidential("top secret text");
+        Field secretField = null;
+        try {
+            secretField = Confidential.class.getDeclaredField("secret");
+        }
+        catch (NoSuchFieldException e) {
+            System.err.println(e);
+            System.exit(1);
+        }
+        secretField.setAccessible(true); // break the lock!
+        try {
+            String wasHidden = (String) secretField.get(message);
+            System.out.println("message.secret = " + wasHidden);
+        }
+        catch (IllegalAccessException e) { 
+            // this will not happen after setAcessible(true)
+            System.err.println(e);
+        }   
+    }
+}

11-pythonic-obj/private/expose.py

@@ -0,0 +1,6 @@
+import Confidential
+
+message = Confidential('top secret text')
+secret_field = Confidential.getDeclaredField('secret')
+secret_field.setAccessible(True)  # break the lock!
+print 'message.secret =', secret_field.get(message)

11-pythonic-obj/private/leakprivate.py

@@ -0,0 +1,11 @@
+from java.lang.reflect import Modifier
+import Confidential
+
+message = Confidential('top secret text')
+fields = Confidential.getDeclaredFields()
+for field in fields:
+    # list private fields only
+    if Modifier.isPrivate(field.getModifiers()):
+        field.setAccessible(True) # break the lock
+        print 'field:', field
+        print '\t', field.getName(), '=', field.get(message)

11-pythonic-obj/private/no_respect.py

@@ -0,0 +1,17 @@
+
+"""
+In the Jython registry file there is this line:
+
+python.security.respectJavaAccessibility = true
+
+Set this to false and Jython provides access to non-public
+fields, methods, and constructors of Java objects.
+"""
+
+import Confidential
+
+message = Confidential('top secret text')
+for name in dir(message):
+    attr = getattr(message, name)
+    if not callable(attr):  # non-methods only
+        print name + '\t=', attr