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From Oliver Heger <heg...@med.uni-marburg.de>
Subject Re: [configuration] getProperties not working as I expect...
Date Wed, 15 Jun 2005 05:59:24 GMT
That does not surprise me. The documentation for the getProperties() 
method is indeed very short. I had to look inside the code to find out 
what it is doing.

I will see if I can improve it a bit.

Oliver

Poppe, Troy wrote:
> Thanks, I think this really boils down, for me, as an misunderstanding/lack of
> understanding of the documentation.
> 
> I'll find another way to do it.
> 
> Thanks.
> 
> Troy
> 
> -----Original Message-----
> From: Oliver Heger [mailto:hegero@med.uni-marburg.de] 
> Sent: Tuesday, June 14, 2005 2:22 AM
> To: Jakarta Commons Users List
> Subject: Re: [configuration] getProperties not working as I expect...
> 
> 
> Poppe, Troy wrote:
> 
>>Assuming that I use the example XML document on the "XMLConfiguration 
>>HOWTO" page (see below), I have a question regarding the use of 
>>Configuration.getProperties().
>>
>>I'd like to get a List of Properties objects that represent the field 
>>nodes for a given table.
>>
>>I started by trying to get a Properties object for one of the field 
>>nodes, but was unable to.
>>
>>Any examples for the use of getProperties or getList that might help 
>>me out here?
>>
>>Thanks.
>>
>>Troy Poppe
>>
>>
>>
>>
>>The Example XML file:
>>
>><?xml version="1.0" encoding="ISO-8859-1" ?>
>>
>><database>
>>  <tables>
>>    <table tableType="system">
>>      <name>users</name>
>>      <fields>
>>        <field>
>>          <name>uid</name>
>>          <type>long</type>
>>        </field>
>>        <field>
>>          <name>uname</name>
>>          <type>java.lang.String</type>
>>        </field>
>>        <field>
>>          <name>firstName</name>
>>          <type>java.lang.String</type>
>>        </field>
>>        <field>
>>          <name>lastName</name>
>>          <type>java.lang.String</type>
>>        </field>
>>        <field>
>>          <name>email</name>
>>          <type>java.lang.String</type>
>>        </field>
>>      </fields>
>>    </table>
>>    <table tableType="application">
>>      <name>documents</name>
>>      <fields>
>>        <field>
>>          <name>docid</name>
>>          <type>long</type>
>>        </field>
>>        <field>
>>          <name>name</name>
>>          <type>java.lang.String</type>
>>        </field>
>>        <field>
>>          <name>creationDate</name>
>>          <type>java.util.Date</type>
>>        </field>
>>        <field>
>>          <name>authorID</name>
>>          <type>long</type>
>>        </field>
>>        <field>
>>          <name>version</name>
>>          <type>int</type>
>>        </field>
>>      </fields>
>>    </table>
>>  </tables>
>></database>
>>
> 
> I had a look at the getProperties() implementation (in 
> AbstractConfiguration), but it does not seem to be suitable for your 
> needs. AFICT it requires the property values to be queried in a form 
> like "key = value", so a supported XML would have to look something like
> 
> ...
> <fields>
>    <field>
>      <fielddata>name=uid</fielddata>
>      <fielddata>type=long</fielddata>
>    </field>
>    ...
> </fields>
> ...
> 
> Then it should be possible to do something like
> 
> Properties props = 
> config.getProperties("tables.table(0).fields.field(0).fielddata");
> 
> for obtaining a properties object with information about the first field 
> of the first table (however I didn't test this).
> 
> Using getList() allows you to query a single property value at a time 
> only. So you can fetch the names of all fields in a table (as shown in 
> the howtos), but you cannot retrieve a combination of the fields' names 
> and types (or further properties).
> 
> IIUYC you would like to do something like
> 
> Properties props = config.getProperties("tables.table.fields.field(0)");
> 
> and would obtain a Properties object with the keys "name" and "type" and 
> the values describing the first field, right? I am sorry, but this is 
> not supported ATM. And I am not sure whether it would be possible to 
> implement such a feature in a general and intuitive way: this would 
> require to parse a property's sub properties and somehow combine them?
> 
> Oliver
> 
> 

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