| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.tajo.algebra; |
| |
| import com.google.common.base.Objects; |
| import org.apache.tajo.util.TUtil; |
| |
| public class ColumnReferenceExpr extends Expr { |
| private String qualifier; |
| private String name; |
| |
| public ColumnReferenceExpr(String referenceName) { |
| super(OpType.Column); |
| setName(referenceName); |
| } |
| |
| public ColumnReferenceExpr(String qualifier, String columnName) { |
| super(OpType.Column); |
| this.qualifier = qualifier.toLowerCase(); |
| this.name = columnName.toLowerCase(); |
| } |
| |
| public boolean hasQualifier() { |
| return this.qualifier != null; |
| } |
| |
| public void setQualifier(String qualifier) { |
| this.qualifier = qualifier.toLowerCase(); |
| } |
| |
| public String getQualifier() { |
| return this.qualifier; |
| } |
| |
| public String getName() { |
| return this.name; |
| } |
| |
| public void setName(String qualifiedName) { |
| String [] parts = qualifiedName.toLowerCase().split("\\."); |
| |
| if (parts.length == 3) { |
| qualifier = qualifiedName.substring(0, qualifiedName.lastIndexOf(".")); |
| name = qualifiedName.substring(qualifiedName.lastIndexOf(".") + 1, qualifiedName.length()); |
| } else if (parts.length == 2) { |
| qualifier = parts[0]; |
| name = parts[1]; |
| } else { |
| name = parts[0]; |
| } |
| } |
| |
| public String getCanonicalName() { |
| if (qualifier != null) { |
| return qualifier + "." + name; |
| } else { |
| return name; |
| } |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hashCode(name, qualifier); |
| } |
| |
| @Override |
| public boolean equalsTo(Expr expr) { |
| ColumnReferenceExpr another = (ColumnReferenceExpr) expr; |
| return name.equals(another.name) && |
| TUtil.checkEquals(qualifier, another.qualifier); |
| } |
| |
| @Override |
| public String toString() { |
| return qualifier != null ? qualifier + "." + name : name; |
| } |
| } |