001 /* 002 // $Id: LevelNode.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.mdx; 021 022 import org.olap4j.metadata.Level; 023 import org.olap4j.type.LevelType; 024 import org.olap4j.type.Type; 025 026 /** 027 * Usage of a {@link org.olap4j.metadata.Level} as an expression in an MDX 028 * parse tree. 029 * 030 * @author jhyde 031 * @version $Id: LevelNode.java 482 2012-01-05 23:27:27Z jhyde $ 032 * @since Jun 4, 2007 033 */ 034 public class LevelNode implements ParseTreeNode { 035 private final ParseRegion region; 036 private final Level level; 037 038 /** 039 * Creates a LevelNode. 040 * 041 * @param region Region of source code 042 * @param level Level which is used in the expression 043 */ 044 public LevelNode( 045 ParseRegion region, 046 Level level) 047 { 048 this.region = region; 049 this.level = level; 050 } 051 052 public ParseRegion getRegion() { 053 return region; 054 } 055 056 /** 057 * Returns the Level used in this expression. 058 * 059 * @return level used in this expression 060 */ 061 public Level getLevel() { 062 return level; 063 } 064 065 public <T> T accept(ParseTreeVisitor<T> visitor) { 066 return visitor.visit(this); 067 } 068 069 public Type getType() { 070 return new LevelType( 071 level.getDimension(), 072 level.getHierarchy(), 073 level); 074 } 075 076 public void unparse(ParseTreeWriter writer) { 077 writer.getPrintWriter().print(level.getUniqueName()); 078 } 079 080 public String toString() { 081 return level.getUniqueName(); 082 } 083 084 public LevelNode deepCopy() { 085 // LevelNode is immutable 086 return this; 087 } 088 089 } 090 091 // End LevelNode.java