Examples of java.security.Permissions.implies()

java.security.Permissions.implies()
Checks to see if this object's PermissionCollection for permissions of the specified permission's class implies the permissions expressed in the permission object. Returns true if the combination of permissions in the appropriate PermissionCollection (e.g., a FilePermissionCollection for a FilePermission) together imply the specified permission.
For example, suppose there is a FilePermissionCollection in this Permissions object, and it contains one FilePermission that specifies "read" access for all files in all subdirectories of the "/tmp" directory, and another FilePermission that specifies "write" access for all files in the "/tmp/scratch/foo" directory. Then if the implies method is called with a permission specifying both "read" and "write" access to files in the "/tmp/scratch/foo" directory, true is returned.
Additionally, if this PermissionCollection contains the AllPermission, this method will always return true.
@param permission the Permission object to check. @return true if "permission" is implied by the permissions in thePermissionCollection it belongs to, false if not.

            Permissions perms = (Permissions) rolePermissions.get(name);
            if( trace )
               log.trace("Checking role="+name+" perms="+perms);
            if( perms == null )
               continue;
            implied = perms.implies(permission);
            if( trace )
               log.trace((implied ? "Allowed: " : "Denied: ")+" permission="+permission);
         }
      }
      else

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        for (int i = 0; i < principals.length; i++) {
            Principal principal = principals[i];


            Permissions permissions = (Permissions) principalPermissionsMap.get(principal);


            if (permissions != null && permissions.implies(permission)) return true;
        }


        return false;
    }

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    perm[6] = new FilePermission("hello.file", "write");
    Permissions perms = new Permissions();
    for (int i = 0; i < perm.length; i++) {
      perms.add(perm[i]);
    }
    assertTrue("Returned true for non-subset of files", !perms
        .implies(new FilePermission("<<ALL FILES>>", "execute")));
    assertTrue("Returned true for non-subset of action", !perms
        .implies(new FilePermission(s + "tmp" + s + "test" + s + "*",
            "execute")));
    assertTrue("Returned false for subset of actions", perms

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    for (int i = 0; i < perm.length; i++) {
      perms.add(perm[i]);
    }
    assertTrue("Returned true for non-subset of files", !perms
        .implies(new FilePermission("<<ALL FILES>>", "execute")));
    assertTrue("Returned true for non-subset of action", !perms
        .implies(new FilePermission(s + "tmp" + s + "test" + s + "*",
            "execute")));
    assertTrue("Returned false for subset of actions", perms
        .implies(new FilePermission("*", "write")));
    assertTrue("Returned false for subset of files", perms

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    assertTrue("Returned true for non-subset of files", !perms
        .implies(new FilePermission("<<ALL FILES>>", "execute")));
    assertTrue("Returned true for non-subset of action", !perms
        .implies(new FilePermission(s + "tmp" + s + "test" + s + "*",
            "execute")));
    assertTrue("Returned false for subset of actions", perms
        .implies(new FilePermission("*", "write")));
    assertTrue("Returned false for subset of files", perms
        .implies(new FilePermission(s + "tmp" + s + "test" + s
            + "test.file", "read")));
    assertTrue("Returned false for subset of files and actions", perms

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    assertTrue("Returned true for non-subset of action", !perms
        .implies(new FilePermission(s + "tmp" + s + "test" + s + "*",
            "execute")));
    assertTrue("Returned false for subset of actions", perms
        .implies(new FilePermission("*", "write")));
    assertTrue("Returned false for subset of files", perms
        .implies(new FilePermission(s + "tmp" + s + "test" + s
            + "test.file", "read")));
    assertTrue("Returned false for subset of files and actions", perms
        .implies(new FilePermission(s + "tmp" + s + "test" + s
            + "test2.file", "write")));

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    assertTrue("Returned false for subset of actions", perms
        .implies(new FilePermission("*", "write")));
    assertTrue("Returned false for subset of files", perms
        .implies(new FilePermission(s + "tmp" + s + "test" + s
            + "test.file", "read")));
    assertTrue("Returned false for subset of files and actions", perms
        .implies(new FilePermission(s + "tmp" + s + "test" + s
            + "test2.file", "write")));
  }
    
    public void test_RuntimePermission_exitVM(){

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  }
    
    public void test_RuntimePermission_exitVM(){
        Permissions permissions = new Permissions();
        permissions.add(new RuntimePermission("exitVM"));
        assertTrue(permissions.implies(new RuntimePermission("exitVM.*")));
        assertTrue(permissions.implies(new RuntimePermission("exitVM.0")));
        
        permissions = new Permissions();
        permissions.add(new RuntimePermission("exitVM.*"));
        assertTrue(permissions.implies(new RuntimePermission("exitVM")));

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    public void test_RuntimePermission_exitVM(){
        Permissions permissions = new Permissions();
        permissions.add(new RuntimePermission("exitVM"));
        assertTrue(permissions.implies(new RuntimePermission("exitVM.*")));
        assertTrue(permissions.implies(new RuntimePermission("exitVM.0")));
        
        permissions = new Permissions();
        permissions.add(new RuntimePermission("exitVM.*"));
        assertTrue(permissions.implies(new RuntimePermission("exitVM")));
        assertTrue(permissions.implies(new RuntimePermission("exitVM.0")));

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        assertTrue(permissions.implies(new RuntimePermission("exitVM.*")));
        assertTrue(permissions.implies(new RuntimePermission("exitVM.0")));
        
        permissions = new Permissions();
        permissions.add(new RuntimePermission("exitVM.*"));
        assertTrue(permissions.implies(new RuntimePermission("exitVM")));
        assertTrue(permissions.implies(new RuntimePermission("exitVM.0")));
    }
}

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