001    /*
002    // $Id: SymbolType.java 482 2012-01-05 23:27:27Z jhyde $
003    //
004    // Licensed to Julian Hyde under one or more contributor license
005    // agreements. See the NOTICE file distributed with this work for
006    // additional information regarding copyright ownership.
007    //
008    // Julian Hyde licenses this file to you under the Apache License,
009    // Version 2.0 (the "License"); you may not use this file except in
010    // compliance with the License. You may obtain a copy of the License at:
011    //
012    // http://www.apache.org/licenses/LICENSE-2.0
013    //
014    // Unless required by applicable law or agreed to in writing, software
015    // distributed under the License is distributed on an "AS IS" BASIS,
016    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017    // See the License for the specific language governing permissions and
018    // limitations under the License.
019    */
020    package org.olap4j.type;
021    
022    /**
023     * The type of a symbolic expression.
024     *
025     * <p>Symbols are identifiers which occur in particular function calls,
026     * generally to indicate an option for how the function should be executed.
027     * They are similar to an enumerated type in other
028     * languages.
029     *
030     * <p>For example, the optional 3rd argument to the <code>Order</code> function
031     * can be one of the symbols <code>ASC</code>, <code>DESC</code>,
032     * <code>BASC</code>, <code>BDESC</code>. The signature of the
033     * <code>Order</code> function is therefore
034     *
035     * <blockquote>
036     * <code>Order(&lt;Set&gt;, &lt;Scalar expression&gt; [, &lt;Symbol&gt;])</code>
037     * </blockquote>
038     *
039     * and
040     *
041     * <blockquote>
042     * <code>Order([Store].Members, [Measures].[Unit Sales], BDESC)</code>
043     * </blockquote>
044     *
045     * would be a valid call to the function.
046     *
047     * @author jhyde
048     * @since Feb 17, 2005
049     * @version $Id: SymbolType.java 482 2012-01-05 23:27:27Z jhyde $
050     */
051    public class SymbolType extends ScalarType {
052    
053        /**
054         * Creates a symbol type.
055         */
056        public SymbolType() {
057        }
058    
059    }
060    
061    // End SymbolType.java