com.espertech.esper.epl.spec.SelectClauseSpecRaw Maven / Gradle / Ivy

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Complex event processing and event series analysis component
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/*
 ***************************************************************************************
 *  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.epl.spec;

import com.espertech.esper.util.MetaDefItem;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

/**
 * Encapsulates the parsed select expressions in a select-clause in an EPL statement.
 */
public class SelectClauseSpecRaw implements MetaDefItem, Serializable {
    private boolean isDistinct;
    private List selectClauseElements;
    private static final long serialVersionUID = -6530225321409268186L;

    /**
     * Ctor.
     */
    public SelectClauseSpecRaw() {
        selectClauseElements = new ArrayList();
        isDistinct = false;
    }

    /**
     * Adds an select expression within the select clause.
     *
     * @param element is the expression to add
     */
    public void add(SelectClauseElementRaw element) {
        selectClauseElements.add(element);
    }

    /**
     * Adds select expressions within the select clause.
     *
     * @param elements is the expressions to add
     */
    public void addAll(Collection elements) {
        selectClauseElements.addAll(elements);
    }

    /**
     * Returns the list of select expressions.
     *
     * @return list of expressions
     */
    public List getSelectExprList() {
        return selectClauseElements;
    }

    public boolean isOnlyWildcard() {
        return (selectClauseElements.size() == 1) && (selectClauseElements.get(0) instanceof SelectClauseElementWildcard);
    }

    /**
     * Returns true if the select clause contains at least one wildcard.
     *
     * @return true if clause contains wildcard, false if not
     */
    public boolean isUsingWildcard() {
        for (SelectClauseElementRaw element : selectClauseElements) {
            if (element instanceof SelectClauseElementWildcard) {
                return true;
            }
        }
        return false;
    }

    /**
     * Returns indictor whether distinct or not.
     *
     * @return distinct indicator
     */
    public boolean isDistinct() {
        return isDistinct;
    }

    /**
     * Sets the indictor whether distinct or not.
     *
     * @param distinct indicator
     */
    public void setDistinct(boolean distinct) {
        isDistinct = distinct;
    }
}