olapelement.java

来自「数据仓库展示程序」· Java 代码 · 共 64 行

/*
// $Id: //open/mondrian/src/main/mondrian/olap/OlapElement.java#10 $
// This software is subject to the terms of the Common Public License
// Agreement, available at the following URL:
// http://www.opensource.org/licenses/cpl.html.
// (C) Copyright 1998-2005 Kana Software, Inc. and others.
// All Rights Reserved.
// You must accept the terms of that agreement to use this software.
//
// jhyde, 21 January, 1999
*/

package mondrian.olap;
import java.io.PrintWriter;

/**
 * An <code>OlapElement</code> is a catalog object (dimension, hierarchy, level,
 * member).  It is also a node in a parse tree.
 **/
public interface OlapElement extends Exp {
    String getUniqueName();
    String getName();
    String getDescription();
    void unparse(PrintWriter pw);
    void accept(Visitor visitor);
    void childrenAccept(Visitor visitor);
    /** Looks up a child element, returning null if it does not exist. */
    OlapElement lookupChild(SchemaReader schemaReader, String s);
    /** Returns the name of this element qualified by its class, for example
     * "hierarchy 'Customers'". **/
    String getQualifiedName();
    String getCaption();
    Hierarchy getHierarchy();
    /**
     * Returns the dimension of a this expression, or null if no dimension is
     * defined. Applicable only to set expressions.
     *
     * <p>Example 1:
     * <blockquote><pre>
     * [Sales].children
     * </pre></blockquote>
     * has dimension <code>[Sales]</code>.</p>
     *
     * <p>Example 2:
     * <blockquote><pre>
     * order(except([Promotion Media].[Media Type].members,
     *              {[Promotion Media].[Media Type].[No Media]}),
     *       [Measures].[Unit Sales], DESC)
     * </pre></blockquote>
     * has dimension [Promotion Media].</p>
     *
     * <p>Example 3:
     * <blockquote><pre>
     * CrossJoin([Product].[Product Department].members,
     *           [Gender].members)
     * </pre></blockquote>
     * has no dimension (well, actually it is [Product] x [Gender], but we
     * can't represent that, so we return null);</p>
     **/
    Dimension getDimension();
}

// End OlapElement.java