Express maps
Hi,
I have the following rule
to create a map and then add an
additional map entry:
<block>
<defvar name='myMap'/>
<!-- Create a map -->
<set name='myMap'>
<map>
<s>a</s>
<s>A</s>
<s>b</s>
<s>B</s>
</map>
</set>
<!-- Add a map entry -->
<set>
<ref>myMap</ref>
<s>c</s>
<s>C</s>
</set>
<!-- Print the entire map -->
<print>
<ref>myMap</ref>
</print>
<ref>myMap</ref>
</block>
The print statement prints:
{a=A, b=B}
whereas I think it should print:
{a=A, b=B, c=C}
The complete block of code
returns:
<Map>
<MapEntry key='a' value='A'/>
<MapEntry key='b' value='B'/>
<MapEntry key='c' value='C'/>
</Map>
So it does look like the additional
entry is being added to the map.
Does anyone know why the print
statement does not print the modified map?
Thanks,
John I
[1276 byte] By [
johni] at [2007-11-26 8:59:02]
# 1
Does seem strange. I create a sample rule that contains your code and it is interesting to see the trace where the </block> does not return the entire list, but the </Rule> does (trace below the message).
Not sure how the processing goes on internally, but here's the fix (either 1 or 2 will work):
1) Remove the <defvar name='myMap'/>.... i.e. set the variable directly.
2) Every time you change the map, refresh it with a statement like this:
<set name='myMap'>
<ref>myMap</ref>
</set>
Hope this helps.
Adi.
Trace for the original rule:
<Rule name='New Rule'>
<block>
<defvar name='myMap'>
</defvar> --> null
<set name='myMap'>
<map>
<s>a</s> --> a
<s>A</s> --> A
<s>b</s> --> b
<s>B</s> --> B
</map> --> {a=A, b=B}
</set> --> null
<set>
<ref>myMap</ref> --> {a=A, b=B}
<s>c</s> --> c
<s>C</s> --> C
</set> --> null
<print>
<ref>myMap</ref> --> {a=A, b=B}
</print> --> {a=A, b=B}
<ref>myMap</ref> --> {a=A, b=B}
</block> --> {a=A, b=B}
</Rule> --> {a=A, c=C, b=B}
