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From "Ken (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CONFIGURATION-510) XMLPropertyListConfiguration parses Map members containing commas when instructed not to
Date Thu, 11 Oct 2012 19:19:03 GMT
Ken created CONFIGURATION-510:
---------------------------------

             Summary: XMLPropertyListConfiguration parses Map members containing commas when
instructed not to
                 Key: CONFIGURATION-510
                 URL: https://issues.apache.org/jira/browse/CONFIGURATION-510
             Project: Commons Configuration
          Issue Type: Bug
          Components: Format
    Affects Versions: 1.9
            Reporter: Ken


XMLPropertyListConfiguration does not properly handle String properties containing commas
when added to the plist as part of a Map.

The following code demonstrates the problem.

public class FooBar extends Object {

   public static final void main(String[] args) throws Exception {
      XMLPropertyListConfiguration config =new XMLPropertyListConfiguration();
      config.setListDelimiter('\0');
      config.setDelimiterParsingDisabled(true);

      config.setProperty("one", "this, that");

      Map<String, String> map =new HashMap<String, String>();
      map.put("two", "this, that");
      config.addProperty("foo", map);

      StringWriter strwriter =new StringWriter();
      config.save(strwriter);
      System.out.println(strwriter.toString());
   }
}

This code produces the following plist.

<?xml version="1.0"?>
<!DOCTYPE plist SYSTEM "file://localhost/System/Library/DTDs/PropertyList.dtd">
<plist version="1.0">
    <dict>
        <key>one</key>
        <string>this, that</string>

        <key>foo</key>
        <dict>
            <key>two</key>
            <array>
                <string>this</string>
                <string>that</string>
            </array>
        </dict>
    </dict>
</plist>

Note that "this, that" has been split into two properties, despite the list delimiter being
set away from the comma default and delimiter parsing disabled.

The problem is in XMLPropertyListConfiguration's printValue(PrintWriter, int, Object) method.
 This method create a MapConfiguration containing the (transformed) "foo" Map.

   printValue(out, indentLevel, new MapConfiguration(map));

The XMLPropertyListConfiguration's delimiter-related settings are never passed to the MapConfiguration,
which retains the enabled and comma defaults.

The following patch to XMLPropertyListConfiguration.java makes Commons Configuration more
correct.

413c413,416
<             printValue(out, indentLevel, new MapConfiguration(map));
---
>             MapConfiguration mapconfig =new MapConfiguration(map);
>             mapconfig.setDefaultListDelimiter(getDefaultListDelimiter());
>             mapconfig.setDelimiterParsingDisabled(isDelimiterParsingDisabled());
>             printValue(out, indentLevel, mapconfig);

With this patch applied, the program outputs the expected plist.

<?xml version="1.0"?>
<!DOCTYPE plist SYSTEM "file://localhost/System/Library/DTDs/PropertyList.dtd">
<plist version="1.0">
    <dict>
        <key>one</key>
        <string>this, that</string>

        <key>foo</key>
        <dict>
            <key>two</key>
            <string>this, that</string>
        </dict>
    </dict>
</plist>

While this patch may provide correct functionality for most use cases, it is still not correct.
 Major structural work needs to be done to fix the problem.

The documentation for AbstractConfiguration's setDefaultListDelimiter(char) method states,
"This value will be used only when creating new configurations. Those already created will
not be affected by this change".  AbstractConfiguration's documentation for setListDelimiter(char)
states, "Note: this change will only be effective for new parsings. If you want it to take
effect for all loaded properties use the no arg constructor and call this method before setting
the source."

MapConfiguration extends AbstractConfiguration, yet does not honor the inherited contracts.
 That MapConfiguration does not have a no arg constructor is fair enough, though would be
somewhat limiting if it did follow the contracts.  That invocations of setDefaultListDelimiter()
and setListDelimiter() effect previously added properties is simply wrong.  Unless state is
maintained for each added property (which would be a messy implementation), the parsing must
not be executed within the getProperty(String) method.  Instead, values must be parsed upon
being added to the MapConfiguration.

The same problem exists within XMLPropertyListConfiguration.  The delegated parsing at issue
in the bug report is invoked from the printValue(PrintWriter, int, Object) method, which is
far too late (again, barring state-saving), to honor the contract that added properties are
parsed, or not, according to the delimiter settings in place at the time each property is
added.



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