DO NOT REPLY [Bug 5184] New: - ComponentUtil.setWriteOnceObject broken

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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=5184

ComponentUtil.setWriteOnceObject broken

           Summary: ComponentUtil.setWriteOnceObject broken
           Product: Avalon
           Version: unspecified
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Major
          Priority: Other
         Component: Framework
        AssignedTo: avalon-dev@jakarta.apache.org
        ReportedBy: [EMAIL PROTECTED]


The setWriteOnceObject method is broken.

    public static final void setWriteOnceObject( Object source, final Object 
value, final String message )
    {
        if ( null == source )
        {
            source = value;
        }
        else
        {
            throw new IllegalStateException( message );
        }
    }

The source = value assignment has no effect whatsoever. As it is now, 
setWriteOnceObject is equivalent to:

    public static final void setWriteOnceObject( Object source, final String 
message )
    {
        if ( null != source )
        {
            throw new IllegalStateException( message );
        }
    }

Test case:

import org.apache.avalon.framework.ComponentUtil;

public class TestComponentUtil {
   
    public static void main (String args[]) throws Exception {
        String source = null;
        String value = "valued";
        String message = "Already set.";
        
        // Prints "null".
        System.out.println (source);
        
        // Prints attempts to set source to "valued"
        ComponentUtil.setWriteOnceObject (source, value, message);
        
        // This should print "valued", but prints "null".
        System.out.println (source);
                
        // Set it again. This should fail, but since source hasn't been
        // set, it passes.
        ComponentUtil.setWriteOnceObject (source, value, message);
        
        // This should print "valued", but prints "null".
        System.out.println (source);
    }
}

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