Re: [CFCDev] cfdump problem

Matt Liotta Fri, 22 Aug 2003 13:46:48 -0700

I believe that the implementation under-the-covers of a CF struct is supposed to implement java.util.Map, which specifies the following for hashCode().

Returns the hash code value for this map. The hash code of a map is defined to be the sum of the hashCodes of each entry in the map's entrySet view. This ensures that t1.equals(t2) implies that t1.hashCode()==t2.hashCode() for any two maps t1 and t2, as required by the general contract of Object.hashCode.

-Matt

On Friday, August 22, 2003, at 04:40 PM, Barney Boisvert wrote:

Huh.  That seems like undesirable behaviour, but perhaps it's just me.
Anyone with an official perspective care to comment?

barneyb

---
Barney Boisvert, Senior Development Engineer
AudienceCentral
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-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Behalf Of Brad Howerter
Sent: Friday, August 22, 2003 1:20 PM
To: '[EMAIL PROTECTED]'
Subject: RE: [CFCDev] cfdump problem


Yep, 6.1.  Nope, not empty.  It works for arrays, strings, and
numbers, but
not for structures.

-----Original Message-----
From: Barney Boisvert [mailto:[EMAIL PROTECTED]
Sent: Friday, August 22, 2003 2:14 PM
To: [EMAIL PROTECTED]
Subject: RE: [CFCDev] cfdump problem


Are you running 6.1?  I ran the tests on a box still running 6.0.
 Also, are
they empty?  I noticed that it returned zero when they were
empty, probably
because the hashcode is computed entirely based on the structures
contents,
although I don't know that for sure.

barneyb

---
Barney Boisvert, Senior Development Engineer
AudienceCentral
[EMAIL PROTECTED]
voice : 360.756.8080 x12
fax   : 360.647.5351

www.audiencecentral.com

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Behalf Of Brad Howerter
Sent: Friday, August 22, 2003 12:39 PM
To: '[EMAIL PROTECTED]'
Subject: RE: [CFCDev] cfdump problem
When I try your code, I get
1804807461
45751061
0
0
Why does st.hashCode() return 0?  I've tried some other
structures as well,
and hashcode always returns 0 for all of my structures.
-----Original Message-----
From: Barney Boisvert [mailto:[EMAIL PROTECTED]
Sent: Thursday, August 21, 2003 4:49 PM
To: [EMAIL PROTECTED]
Subject: RE: [CFCDev] cfdump problem
hashCode() is a method that every Java object has, and since CF is Java, every CF object has it as well, including strings, numbers, everything. You use it like any other method, except that you needn't have an CF object (created with createObject() or CFOBJECT) to call it on.
s = "my String";
writeoutput(s.hashCode() & "<br />");
d = 0.454;
writeoutput(d.hashCode() & "<br />");
st = structNew();
st['s'] = s;
writeoutput(st.hashCode() & "<br />");
st['d'] = d;
writeoutput(st.hashCode() & "<br />");
the method will return a string that is as unique to the object as possible, but the same as every other object that is considered 'equal' to the object. 'equal' is determined by the Java equals() method, which defaults to the memory location of the class, but is overridden by many classes, most notably the String class. This will output true three times,

even though

the objects are different.  (That's actually a lie, but it still
illustrates
the point).

s = "my String";
s2 = "my String";
if (s EQ s2)
        writeoutput("true<br />");
if (s.equals(s2))
        writeoutput("true<br />");
if (s.hashCode() EQ s2.hashCode())
        writeoutput("true<br />");

Here's the output I got on my system (for both snippets):

1804807461
45751061
6774247
7476378
true
true
true

---
Barney Boisvert, Senior Development Engineer
AudienceCentral
[EMAIL PROTECTED]
voice : 360.756.8080 x12
fax   : 360.647.5351

www.audiencecentral.com

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Behalf Of Brad Howerter
Sent: Thursday, August 21, 2003 3:28 PM
To: '[EMAIL PROTECTED]'
Subject: RE: [CFCDev] cfdump problem

How do you use hashcode()? I can't find any documentation for

it. Please

provide an example.
-----Original Message-----
From: Chafic Kazoun [mailto:[EMAIL PROTECTED]
Sent: Thursday, August 21, 2003 4:13 PM
To: [EMAIL PROTECTED]
Subject: RE: [CFCDev] cfdump problem
The main reason for this is that Flash's debugging tools don't

always meet

your needs and you resort to dumping an object to make
sure your code is doing what it needs to do.  The debugger in
Flash is also
really really slow and dumping out the object rather
than dealing with the slow-downs is much easier...

Thanks

Chafic
_____________________________
Work: http://www.blinex.com
Blog : http://www.rewindlife.com

-----Original Message-----
From: [EMAIL PROTECTED]

[mailto:[EMAIL PROTECTED] On Behalf

Of Barney Boisvert
Sent: Thursday, August 21, 2003 5:58 PM
To: [EMAIL PROTECTED]
Subject: RE: [CFCDev] cfdump problem

What do you use recursive structures in Flash for?

especially with such

frequency.

---
Barney Boisvert, Senior Development Engineer
AudienceCentral
[EMAIL PROTECTED]
voice : 360.756.8080 x12
fax   : 360.647.5351

www.audiencecentral.com

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Behalf Of Samuel Neff
Sent: Thursday, August 21, 2003 2:09 PM
To: [EMAIL PROTECTED]
Subject: RE: [CFCDev] cfdump problem

There are lots of situations where this recursive structures are
useful.  I
haven't used them in CF, but in Flash we do it all the time.

Here's a mini cfdump that just does structures and handles

the recursive

issue. It uses the hashCode() Barney mentioned.

hashCode() is a Java

function available on any object that creates an (almost) unique
key for the
object.  I say almost 'cause it is theoretically possible

to create a

duplicate, but it's really rare.
You'd have to expand it to work with arrays and (if you care)
xml, java and
com objects.
HTH,

Sam


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Re: [CFCDev] cfdump problem

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