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   *  to you under the Apache License, Version 2.0 (the
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  package org.apache.cayenne.exp.parser;
  
  import org.apache.cayenne.exp.Expression;
  import org.apache.cayenne.exp.ExpressionException;
  import org.apache.cayenne.util.ConversionUtil;
  
  import java.io.IOException;
  import java.util.List;
  
  /**
   * "WHEN" part of the case-when expression.
   *
   * @since 5.0
   */
  public class ASTWhen extends AggregateConditionNode {
  
      public ASTWhen(Expression condition) {
          super(0);
          jjtAddChild((Node) condition, 0);
          connectChildren();
      }
  
      public ASTWhen(int id) {
          super(id);
      }
  
      @Override
      public Expression shallowCopy() {
          return new ASTWhen(id);
      }
  
      @Override
      protected String getExpressionOperator(int index) {
          return "when";
      }
  
      @Override
      protected Object evaluateNode(Object o) throws Exception {
          if (jjtGetNumChildren() == 0) {
              return Boolean.FALSE;
          }
          Object value = evaluateChild(0, o);
          if (ConversionUtil.toBoolean(value)) {
              return Boolean.TRUE;
          }
          return Boolean.FALSE;
      }
  
      @Override
      public int getType() {
          return Expression.WHEN;
      }
  
      @Override
      public void jjtSetParent(Node n) {
          if (!(n instanceof ASTCaseWhen)) {
              throw new ExpressionException(expName() + ": invalid parent");
          }
          parent = n;
      }
  
      @Override
      public void appendAsEJBQL(List<Object> parameterAccumulator, Appendable out, String rootId) throws IOException {
          throw new UnsupportedOperationException("EJBQL 'when' is not supported");
      }
  }
  