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From "Laurentiu Cocanu (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CAY-1241) Add method to ExpressionFactory to match against the primary key of an object or list of objects
Date Mon, 15 Jun 2009 10:25:07 GMT

     [ https://issues.apache.org/jira/browse/CAY-1241?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Laurentiu Cocanu updated CAY-1241:
----------------------------------

    Attachment: patch.txt

A possible solution to this issue (also in the attached patch):

/**
     * Creates an expression that matches the primary key of object in <code>ObjectId</code>'s
<code>IdSnapshot</code> for the argument <code>object</code>.    

     */
    public static Expression matchObject(CayenneDataObject object) {    	
    	ObjectId obid = object.getObjectId();
 		
 		Map<String, Object> objectIdKeys = obid.getIdSnapshot();
 		 		
 		Iterator<String> it = objectIdKeys.keySet().iterator();
 		
 		String key = it.next();
		Object value = objectIdKeys.get(key);
		Expression exp = ExpressionFactory.matchDbExp(key, value);
 		
 		while(it.hasNext())	{
 			key = it.next();
 			value = objectIdKeys.get(key);
 			exp = exp.andExp(ExpressionFactory.matchDbExp(key, value));
 		}
 		
 		return exp;
    }
    
    /**
     * Creates an expression that matches any of the objects contained in the list <code>objects</code>
     */
    public static Expression matchObjects(List<CayenneDataObject> objects) {    	
    	Iterator<CayenneDataObject> it = objects.iterator();
    	Expression exp = matchObject(it.next());
    	while(it.hasNext())	{ 			
 			exp = exp.orExp(matchObject(it.next()));
 		}
 		
 		return exp;
    }

> Add method to ExpressionFactory to match against the primary key of an object or list
of objects
> ------------------------------------------------------------------------------------------------
>
>                 Key: CAY-1241
>                 URL: https://issues.apache.org/jira/browse/CAY-1241
>             Project: Cayenne
>          Issue Type: Improvement
>          Components: Cayenne Core Library
>    Affects Versions: 3.0M6
>            Reporter: √ėyvind Harboe
>         Attachments: patch.txt
>
>
> It would be helpful to have a method in ExpressionFactory that build an expression using
matchDbExp() to match an object's primary keys.
> This can be helpful in excluding a single or list of known objects from the result of
a query.

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