/*
***************************************************************************************
* Copyright (C) 2006 EsperTech, Inc. All rights reserved. *
* http://www.espertech.com/esper *
* http://www.espertech.com *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the GPL license *
* a copy of which has been included with this distribution in the license.txt file. *
***************************************************************************************
*/
package com.espertech.esper.client.soda;
import java.io.StringWriter;
/**
* Array expression forms array results, similar to the syntax of "{element 1, element 2, ... element n}".
*/
public class ArrayExpression extends ExpressionBase {
private static final long serialVersionUID = 5332982041846659978L;
/**
* Ctor.
*/
public ArrayExpression() {
}
/**
* Add a property to the expression.
*
* @param property to add
* @return expression
*/
public ArrayExpression add(String property) {
this.getChildren().add(new PropertyValueExpression(property));
return this;
}
/**
* Add a constant to the expression.
*
* @param object constant to add
* @return expression
*/
public ArrayExpression add(Object object) {
this.getChildren().add(new ConstantExpression(object));
return this;
}
/**
* Add an expression representing an array element to the expression.
*
* @param expression to add
* @return expression
*/
public ArrayExpression add(Expression expression) {
this.getChildren().add(expression);
return this;
}
public ExpressionPrecedenceEnum getPrecedence() {
return ExpressionPrecedenceEnum.UNARY;
}
public void toPrecedenceFreeEPL(StringWriter writer) {
writer.write("{");
boolean isFirst = true;
for (Expression child : this.getChildren()) {
if (!isFirst) {
writer.write(",");
}
child.toEPL(writer, ExpressionPrecedenceEnum.MINIMUM);
isFirst = false;
}
writer.write("}");
}
}