How to use

setBaseExpression

method

in

org.eclipse.persistence.internal.expressions.ArgumentListFunctionExpression

/**
 * INTERNAL:
 * Add a new Expression to the list of arguments.
 * This method will update the list of arguments and any constant strings that are required
 * to be printed with the arguments
 * @param argument
 */
@Override
public synchronized void addChild(Expression argument){
  if (hasLastChild != null && hasLastChild.booleanValue()){
    getChildren().add(getChildren().size() - 1, argument);
  } else {
    super.addChild(argument);
  }
  setBaseExpression(getChildren().firstElement());
  ((ListExpressionOperator)operator).incrementNumberOfItems();
}

/**
 * INTERNAL:
 * Add a new Expression to the list of arguments.  
 * This method will update the list of arguments and any constant strings that are required
 * to be printed with the arguments
 * @param argument
 */
@Override
public synchronized void addChild(Expression argument){
  if (hasLastChild != null && hasLastChild.booleanValue()){
    getChildren().add(getChildren().size() - 1, argument);
  } else {
    super.addChild(argument);
  }
  setBaseExpression((Expression)getChildren().firstElement());
  ((ListExpressionOperator)operator).incrementNumberOfItems();
}

/**
 * INTERNAL:
 * Add a new Expression to the list of arguments.  
 * This method will update the list of arguments and any constant strings that are required
 * to be printed with the arguments
 * @param argument
 */
@Override
public synchronized void addChild(Expression argument){
  if (hasLastChild != null && hasLastChild.booleanValue()){
    getChildren().add(getChildren().size() - 1, argument);
  } else {
    super.addChild(argument);
  }
  setBaseExpression((Expression)getChildren().firstElement());
  ((ListExpressionOperator)operator).incrementNumberOfItems();
}

Expression base = Expression.from(iterator.next(), this);
expression.addChild(base);
expression.setBaseExpression(base);//base needs to be the same as the first child for reportQuery items.
while (iterator.hasNext()) {
  expression.addChild(Expression.from(iterator.next(), this));

Expression base = Expression.from(iterator.next(), this);
expression.addChild(base);
expression.setBaseExpression(base);//base needs to be the same as the first child for reportQuery items. 
while (iterator.hasNext()) {
  expression.addChild(Expression.from(iterator.next(), this));

public ArgumentListFunctionExpression coalesce() {
  ListExpressionOperator coalesceOperator = (ListExpressionOperator)getOperator(ExpressionOperator.Coalesce);
  ListExpressionOperator clonedCoalesceOperator = new ListExpressionOperator();
  coalesceOperator.copyTo(clonedCoalesceOperator);
  ArgumentListFunctionExpression expression = new ArgumentListFunctionExpression();
  expression.setBaseExpression(this);
  expression.setOperator(clonedCoalesceOperator);
  return expression;
}

public ArgumentListFunctionExpression coalesce() {
  ListExpressionOperator coalesceOperator = (ListExpressionOperator)getOperator(ExpressionOperator.Coalesce);
  ListExpressionOperator clonedCoalesceOperator = new ListExpressionOperator();
  coalesceOperator.copyTo(clonedCoalesceOperator);
  ArgumentListFunctionExpression expression = new ArgumentListFunctionExpression();
  expression.setBaseExpression(this);
  expression.setOperator(clonedCoalesceOperator);
  return expression;
}

/**
 * INTERNAL:
 * Creates an ArgumentListFunctionExpression that is capable of creating a case statement of the form:
 * <blockquote><pre>
 * SQL: CASE name WHEN "Robert" THEN "Bob"
 *     WHEN "Susan" THEN "Sue"
 *  ELSE "No-Nickname"
 * </pre></blockquote>
 * 
 * This expression must be manipulated to successfully build a case statement by adding appropriate 
 * children to it.
 * 
 * A child must be added for the "case expression" (name above), a pair of children must be added for 
 * each "when then" expression and a child must be added for the else.
 * 
 * @see ArgumentListFunctionExpression
 */
public ArgumentListFunctionExpression caseStatement() {
  
  ListExpressionOperator caseOperator = (ListExpressionOperator)getOperator(ExpressionOperator.Case);
  ListExpressionOperator clonedCaseOperator = new ListExpressionOperator();
  caseOperator.copyTo(clonedCaseOperator);
  ArgumentListFunctionExpression expression = new ArgumentListFunctionExpression();
  expression.setBaseExpression(this);
  expression.setOperator(clonedCaseOperator);
  return expression;
}
 

/**
 * INTERNAL:
 * Creates an ArgumentListFunctionExpression that is capable of creating a case statement of the form:
 * <blockquote><pre>
 * SQL: CASE WHEN name = "Robert" THEN "Bob"
 *     WHEN name = "Susan" THEN "Sue"
 *  ELSE "No-Nickname" 
 * </pre></blockquote>
 * 
 * This expression must be manipulated to successfully build a case statement by adding appropriate 
 * children to it.
 * 
 * A pair of children must be added for  each "when then" expression and a child must be added for the else.
 * 
 * @see ArgumentListFunctionExpression
 */
public ArgumentListFunctionExpression caseConditionStatement() {
  ListExpressionOperator caseOperator = (ListExpressionOperator)getOperator(ExpressionOperator.CaseCondition);
  ListExpressionOperator clonedCaseOperator = new ListExpressionOperator();
  caseOperator.copyTo(clonedCaseOperator);
  ArgumentListFunctionExpression expression = new ArgumentListFunctionExpression();
  expression.setBaseExpression(this);
  expression.setOperator(clonedCaseOperator);
  return expression;
}
 

/**
 * INTERNAL:
 * Creates an ArgumentListFunctionExpression that is capable of creating a case statement of the form:
 * <blockquote><pre>
 * SQL: CASE name WHEN "Robert" THEN "Bob"
 *     WHEN "Susan" THEN "Sue"
 *  ELSE "No-Nickname"
 * </pre></blockquote>
 *
 * This expression must be manipulated to successfully build a case statement by adding appropriate
 * children to it.
 *
 * A child must be added for the "case expression" (name above), a pair of children must be added for
 * each "when then" expression and a child must be added for the else.
 *
 * @see ArgumentListFunctionExpression
 */
public ArgumentListFunctionExpression caseStatement() {
  ListExpressionOperator caseOperator = (ListExpressionOperator)getOperator(ExpressionOperator.Case);
  ListExpressionOperator clonedCaseOperator = new ListExpressionOperator();
  caseOperator.copyTo(clonedCaseOperator);
  ArgumentListFunctionExpression expression = new ArgumentListFunctionExpression();
  expression.setBaseExpression(this);
  expression.setOperator(clonedCaseOperator);
  return expression;
}

/**
 * INTERNAL:
 * Creates an ArgumentListFunctionExpression that is capable of creating a case statement of the form:
 * <blockquote><pre>
 * SQL: CASE WHEN name = "Robert" THEN "Bob"
 *     WHEN name = "Susan" THEN "Sue"
 *  ELSE "No-Nickname"
 * </pre></blockquote>
 *
 * This expression must be manipulated to successfully build a case statement by adding appropriate
 * children to it.
 *
 * A pair of children must be added for  each "when then" expression and a child must be added for the else.
 *
 * @see ArgumentListFunctionExpression
 */
public ArgumentListFunctionExpression caseConditionStatement() {
  ListExpressionOperator caseOperator = (ListExpressionOperator)getOperator(ExpressionOperator.CaseCondition);
  ListExpressionOperator clonedCaseOperator = new ListExpressionOperator();
  caseOperator.copyTo(clonedCaseOperator);
  ArgumentListFunctionExpression expression = new ArgumentListFunctionExpression();
  expression.setBaseExpression(this);
  expression.setOperator(clonedCaseOperator);
  return expression;
}

public ArgumentListFunctionExpression coalesce() {
  ListExpressionOperator anOperator = new ListExpressionOperator();
  anOperator.setSelector(ExpressionOperator.Coalesce);
  anOperator.setNodeClass(FunctionExpression.class);
  anOperator.setType(ExpressionOperator.FunctionOperator);
  anOperator.bePrefix();
  anOperator.setStartString("COALESCE(");
  anOperator.setSeparator(",");
  anOperator.setTerminationString(" )");
  ArgumentListFunctionExpression expression = new ArgumentListFunctionExpression();
  expression.setBaseExpression(this);
  expression.setOperator(anOperator);
  return expression;
}

Expression base = Expression.from(iterator.next(), this);
expression.addChild(base);
expression.setBaseExpression(base);//base needs to be the same as the first child for reportQuery items. 
while (iterator.hasNext()) {
  expression.addChild(Expression.from(iterator.next(), this));

expression.setBaseExpression(this);

expression.setBaseExpression(this);