EJBQLExpression


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19  package org.apache.cayenne.ejbql;
20  
21  /**
22   * An abstract EJBQL expression interface.
23   * 
24   * @since 3.0
25   * @author Andrus Adamchik
26   */
27  public interface EJBQLExpression {
28  
29      /**
30       * Accepts a visitor, calling appropriate visitor method. If the visitor method
31       * returns true, visits all children, otherwise stops.
32       */
33      void visit(EJBQLExpressionVisitor visitor);
34  
35      /**
36       * Returns a number of child operands of this expression node.
37       */
38      int getChildrenCount();
39  
40      /**
41       * Returns a child expression node at the specified index.
42       */
43      EJBQLExpression getChild(int index);
44  
45      /**
46       * Returns a text property of the node.
47       */
48      String   getText();
49  
50      /**
51       * Returns an optional boolean flag that negates the value of the expression.
52       */
53      boolean isNegated();
54  }
55
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