| /** |
| * 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.catalog; |
| |
| import com.google.common.base.Objects; |
| import com.google.gson.annotations.Expose; |
| import org.apache.tajo.catalog.json.CatalogGsonHelper; |
| import org.apache.tajo.catalog.proto.CatalogProtos.ColumnProto; |
| import org.apache.tajo.common.ProtoObject; |
| import org.apache.tajo.common.TajoDataTypes; |
| import org.apache.tajo.common.TajoDataTypes.DataType; |
| import org.apache.tajo.json.GsonObject; |
| import org.apache.tajo.schema.IdentifierUtil; |
| import org.apache.tajo.type.Type; |
| import org.apache.tajo.type.TypeProtobufEncoder; |
| |
| /** |
| * Describes a column. It is an immutable object. |
| */ |
| @Deprecated |
| public class Column implements ProtoObject<ColumnProto>, GsonObject { |
| @Expose protected String name; |
| @Expose protected Type type; |
| |
| /** |
| * Column Constructor |
| * |
| * @param name field name |
| * @param type Type description |
| */ |
| public Column(String name, TypeDesc type) { |
| this.name = name; |
| this.type = TypeConverter.convert(type); |
| } |
| |
| /** |
| * |
| * @param name Column name |
| * @param dataType Data Type with length |
| */ |
| public Column(String name, DataType dataType) { |
| this(name, new TypeDesc(dataType)); |
| } |
| |
| /** |
| * |
| * @param name Column name |
| * @param type Data Type without length |
| */ |
| public Column(String name, TajoDataTypes.Type type) { |
| this(name, CatalogUtil.newSimpleDataType(type)); |
| } |
| |
| /** |
| * |
| * @param name Column name |
| * @param type Type |
| */ |
| public Column(String name, Type type) { |
| this.name = name; |
| this.type = type; |
| } |
| |
| public Column(ColumnProto proto) { |
| name = proto.getName(); |
| type = TypeProtobufEncoder.decode(proto.getType()); |
| } |
| |
| /** |
| * |
| * @return True if a column includes a table name. Otherwise, it returns False. |
| */ |
| public boolean hasQualifier() { |
| return name.split(IdentifierUtil.IDENTIFIER_DELIMITER_REGEXP).length > 1; |
| } |
| |
| /** |
| * |
| * @return The full name of this column. |
| */ |
| public String getQualifiedName() { |
| return name; |
| } |
| |
| /** |
| * |
| * @return The qualifier |
| */ |
| public String getQualifier() { |
| return IdentifierUtil.extractQualifier(name); |
| } |
| |
| /** |
| * |
| * @return The simple name without qualifications |
| */ |
| public String getSimpleName() { |
| return IdentifierUtil.extractSimpleName(name); |
| } |
| |
| /** |
| * Return type description |
| * |
| * @return TypeDesc |
| */ |
| public TypeDesc getTypeDesc() { |
| return TypeConverter.convert(this.type); |
| } |
| |
| /** |
| * @return Type which includes domain type and scale. |
| */ |
| public Type getType() { |
| return this.type; |
| } |
| |
| /** |
| * |
| * @return DataType which includes domain type and scale. |
| */ |
| public DataType getDataType() { |
| return TypeConverter.convert(this.type).getDataType(); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (o instanceof Column) { |
| Column another = (Column)o; |
| return name.equals(another.name) && type.equals(another.type); |
| } |
| return false; |
| } |
| |
| public int hashCode() { |
| return Objects.hashCode(name, type); |
| } |
| |
| /** |
| * |
| * @return The protocol buffer object for Column |
| */ |
| @Override |
| public ColumnProto getProto() { |
| ColumnProto.Builder builder = ColumnProto.newBuilder(); |
| builder |
| .setName(this.name) |
| .setType(this.type.getProto()); |
| return builder.build(); |
| } |
| |
| public String toString() { |
| StringBuilder sb = new StringBuilder(getQualifiedName()); |
| sb.append(" (").append(type.toString()).append(")"); |
| return sb.toString(); |
| } |
| |
| @Override |
| public String toJson() { |
| return CatalogGsonHelper.toJson(this, Column.class); |
| } |
| |
| } |