| /** |
| * 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.Function; |
| import com.google.common.collect.ImmutableCollection; |
| import com.google.common.collect.ImmutableList; |
| import org.apache.tajo.common.TajoDataTypes; |
| import org.apache.tajo.schema.Field; |
| import org.apache.tajo.schema.QualifiedIdentifier; |
| import org.apache.tajo.type.Type; |
| |
| import javax.annotation.Nullable; |
| import java.util.Iterator; |
| |
| import static org.apache.tajo.catalog.FieldConverter.toQualifiedIdentifier; |
| |
| /** |
| * Builder for Schema |
| */ |
| public class SchemaBuilder { |
| private final SchemaCollector fields; |
| |
| public interface SchemaCollector { |
| void add(Field field); |
| void addAll(Iterator<Field> fields); |
| void addAll(Iterable<Field> fields); |
| ImmutableCollection<Field> build(); |
| } |
| |
| public static SchemaLegacy empty() { |
| return builder().build(); |
| } |
| |
| public static SchemaBuilder builder() { |
| return new SchemaBuilder(new ListSchemaBuilder()); |
| } |
| |
| public static SchemaBuilder uniqueNameBuilder() { |
| return new SchemaBuilder(new SetSchemaBuilder()); |
| } |
| |
| SchemaBuilder(SchemaCollector collector) { |
| this.fields = collector; |
| } |
| |
| public SchemaBuilder add(Field field) { |
| fields.add(field); |
| return this; |
| } |
| |
| public SchemaBuilder add(QualifiedIdentifier id, Type type) { |
| add(new Field(id, type)); |
| return this; |
| } |
| |
| @Deprecated |
| public SchemaBuilder add(String name, TypeDesc legacyType) { |
| add(toQualifiedIdentifier(name), TypeConverter.convert(legacyType)); |
| return this; |
| } |
| |
| @Deprecated |
| public SchemaBuilder add(String name, TajoDataTypes.DataType dataType) { |
| add(name, new TypeDesc(dataType)); |
| return this; |
| } |
| |
| @Deprecated |
| public SchemaBuilder add(String name, TajoDataTypes.Type baseType) { |
| add(name, new TypeDesc(CatalogUtil.newSimpleDataType(baseType))); |
| return this; |
| } |
| |
| @Deprecated |
| public SchemaBuilder add(Column column) { |
| add(FieldConverter.convert(column)); |
| return this; |
| } |
| |
| @Deprecated |
| public SchemaBuilder addAll(Iterable<Column> columns) { |
| return addAll2(columns, new Function<Column, Field>() { |
| @Override |
| public Field apply(@Nullable Column input) { |
| return FieldConverter.convert(input); |
| } |
| }); |
| } |
| |
| @Deprecated |
| public SchemaBuilder addAll(Column [] columns) { |
| return addAll2(columns, new Function<Column, Field>() { |
| @Override |
| public Field apply(@Nullable Column input) { |
| return FieldConverter.convert(input); |
| } |
| }); |
| } |
| |
| @Deprecated |
| public <T> SchemaBuilder addAll(T [] fields, Function<T, Column> fn) { |
| for (T t : fields) { |
| add(fn.apply(t)); |
| } |
| return this; |
| } |
| |
| @Deprecated |
| public <T> SchemaBuilder addAll(Iterable<T> fields, Function<T, Column> fn) { |
| for (T t : fields) { |
| add(fn.apply(t)); |
| } |
| return this; |
| } |
| |
| @Deprecated |
| public <T> SchemaBuilder addAll(Iterator<T> fields, Function<T, Column> fn) { |
| while(fields.hasNext()) { |
| T t = fields.next(); |
| add(fn.apply(t)); |
| } |
| return this; |
| } |
| |
| public SchemaBuilder addAll2(Iterable<Field> fields) { |
| this.fields.addAll(fields); |
| return this; |
| } |
| |
| public <T> SchemaBuilder addAll2(T [] fields, Function<T, Field> fn) { |
| for (T t : fields) { |
| add(fn.apply(t)); |
| } |
| return this; |
| } |
| |
| public <T> SchemaBuilder addAll2(Iterable<T> fields, Function<T, Field> fn) { |
| for (T t : fields) { |
| add(fn.apply(t)); |
| } |
| return this; |
| } |
| |
| public <T> SchemaBuilder addAll2(Iterator<T> fields, Function<T, Field> fn) { |
| while(fields.hasNext()) { |
| T t = fields.next(); |
| add(fn.apply(t)); |
| } |
| return this; |
| } |
| |
| @Deprecated |
| public SchemaLegacy build() { |
| ImmutableList.Builder<Column> columns = new ImmutableList.Builder(); |
| for (Field field : fields.build()) { |
| columns.add(new Column(field.name().interned(), field.type())); |
| } |
| |
| return new SchemaLegacy(columns.build()); |
| } |
| |
| public org.apache.tajo.schema.Schema buildV2() { |
| return new org.apache.tajo.schema.Schema(fields.build()); |
| } |
| } |