PatternEveryDistinctExpr.java

/**************************************************************************************
 * Copyright (C) 2008 EsperTech, Inc. All rights reserved.                            *
 * http://esper.codehaus.org                                                          *
 * 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;
import java.util.List;
import java.util.ArrayList;

/**
 * Every-Distinct construct for use in pattern expressions.
 */
public class PatternEveryDistinctExpr extends PatternExprBase
{
    private static final long serialVersionUID = 0;
    private List<Expression> expressions = new ArrayList<Expression>();

    /**
     * Ctor - for use to create a pattern expression tree, without unique-criterial expression.
     */
    public PatternEveryDistinctExpr()
    {
    }

    /**
     * Ctor - for use to create a pattern expression tree, without unique-criterial expression.
     * @param expressions distinct expressions
     */
    public PatternEveryDistinctExpr(List<Expression> expressions) {
        this.expressions = expressions;
    }

    /**
     * Returns distinct expressions
     * @return expr
     */
    public List<Expression> getExpressions() {
        return expressions;
    }

    /**
     * Sets distinct expressions.
     * @param expressions expr
     */
    public void setExpressions(List<Expression> expressions) {
        this.expressions = expressions;
    }

    public PatternExprPrecedenceEnum getPrecedence() {
        return PatternExprPrecedenceEnum.EVERY_NOT;
    }

    public void toPrecedenceFreeEPL(StringWriter writer, EPStatementFormatter formatter)
    {
        writer.write("every-distinct(");
        String delimiter = "";
        for (Expression expr : expressions) {
            writer.write(delimiter);
            expr.toEPL(writer, ExpressionPrecedenceEnum.MINIMUM);
            delimiter = ", ";
        }
        writer.write(") ");

        this.getChildren().get(0).toEPL(writer, getPrecedence(), formatter);
    }
}