001 /*
002 // $Id: WithSetNode.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.type.Type;
023
024 import java.io.PrintWriter;
025
026 /**
027 * Parse tree node which declares a calculated set. Represented as the
028 * <code>WITH SET</code> clause of an MDX <code>SELECT</code> statement.
029 *
030 * @version $Id: WithSetNode.java 482 2012-01-05 23:27:27Z jhyde $
031 * @author jhyde
032 */
033 public class WithSetNode implements ParseTreeNode {
034
035 private final ParseRegion region;
036 /** name of set */
037 private final IdentifierNode name;
038
039 /** defining expression */
040 private ParseTreeNode expression;
041
042 /**
043 * Creates a declaration of a named set.
044 *
045 * @param region Region of source code
046 * @param name Name of set
047 * @param expression Expression to calculate set
048 */
049 public WithSetNode(
050 ParseRegion region,
051 IdentifierNode name,
052 ParseTreeNode expression)
053 {
054 this.region = region;
055 this.name = name;
056 this.expression = expression;
057 }
058
059 public ParseRegion getRegion() {
060 return region;
061 }
062
063 public void unparse(ParseTreeWriter writer) {
064 PrintWriter pw = writer.getPrintWriter();
065 pw.print("SET ");
066 name.unparse(writer);
067 writer.indent();
068 pw.println(" AS");
069 expression.unparse(writer);
070 writer.outdent();
071 }
072
073 /**
074 * Returns the name of the set.
075 *
076 * @return name of the set
077 */
078 public IdentifierNode getIdentifier() {
079 return name;
080 }
081
082 /**
083 * Returns the expression which calculates the set.
084 *
085 * @return expression which calculates the set
086 */
087 public ParseTreeNode getExpression() {
088 return expression;
089 }
090
091 /**
092 * Sets the expression which calculates the set.
093 *
094 * @param expression expression which calculates the set
095 */
096 public void setExpression(ParseTreeNode expression) {
097 this.expression = expression;
098 }
099
100 public <T> T accept(ParseTreeVisitor<T> visitor) {
101 final T t = visitor.visit(this);
102 name.accept(visitor);
103 expression.accept(visitor);
104 return t;
105 }
106
107 public Type getType() {
108 // not an expression
109 throw new UnsupportedOperationException();
110 }
111
112 public WithSetNode deepCopy() {
113 return new WithSetNode(
114 this.region,
115 this.name.deepCopy(),
116 this.expression.deepCopy());
117 }
118 }
119
120 // End WithSetNode.java