QueryItem


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19  package org.netbeans.modules.db.sql.visualeditor.querymodel;
20  
21  import java.util.Collection  ;
22  
23  // the comon base type of every item present in a query
24  // provides common functionalities to all items
25  public interface QueryItem {
26      // generate text that represent the item
27      public String   genText();
28      // walks recursively the specific item to find all teh columns that are referenced from this item.
29      // For instance, called on a WHERE cluase will return all teh columns used in the expression of the WHERE clause
30      // could be used by the editor to obtain info on all teh column used in a particular clause
31      public void getReferencedColumns(Collection   columns);
32      // fills the provided Collection with a list of all the items used in this specific item, but only one level
33      // So for instance on Query it would provide what the query is composed of (Select, From, Where, etc.)
34      // on Where it would provide the expression used
35      // on Column it would do nothing as that does not have any "nested" query item
36      public void getQueryItems(Collection   items);
37  }
38  
39

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