| // 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.impala.catalog; |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.apache.commons.lang3.StringUtils; |
| import org.apache.impala.thrift.TColumnType; |
| import org.apache.impala.thrift.TTypeNode; |
| import org.apache.impala.thrift.TTypeNodeType; |
| |
| import com.google.common.base.Joiner; |
| import com.google.common.base.Preconditions; |
| |
| /** |
| * Describes a STRUCT type. STRUCT types have a list of named struct fields. |
| */ |
| public class StructType extends Type { |
| private final Map<String, StructField> fieldMap_ = new HashMap<>(); |
| private final List<StructField> fields_; |
| |
| public StructType(List<StructField> fields) { |
| Preconditions.checkNotNull(fields); |
| fields_ = fields; |
| for (int i = 0; i < fields_.size(); ++i) { |
| fields_.get(i).setPosition(i); |
| fieldMap_.put(fields_.get(i).getName().toLowerCase(), fields_.get(i)); |
| } |
| } |
| |
| public StructType() { |
| fields_ = new ArrayList<>(); |
| } |
| |
| @Override |
| public String toSql(int depth) { |
| if (depth >= MAX_NESTING_DEPTH) return "STRUCT<...>"; |
| List<String> fieldsSql = new ArrayList<>(); |
| for (StructField f: fields_) fieldsSql.add(f.toSql(depth + 1)); |
| return String.format("STRUCT<%s>", Joiner.on(",").join(fieldsSql)); |
| } |
| |
| @Override |
| protected String prettyPrint(int lpad) { |
| String leftPadding = StringUtils.repeat(' ', lpad); |
| List<String> fieldsSql = new ArrayList<>(); |
| for (StructField f: fields_) fieldsSql.add(f.prettyPrint(lpad + 2)); |
| return String.format("%sSTRUCT<\n%s\n%s>", |
| leftPadding, Joiner.on(",\n").join(fieldsSql), leftPadding); |
| } |
| |
| public void addField(StructField field) { |
| field.setPosition(fields_.size()); |
| fields_.add(field); |
| fieldMap_.put(field.getName().toLowerCase(), field); |
| } |
| |
| public List<StructField> getFields() { return fields_; } |
| |
| public StructField getField(String fieldName) { |
| return fieldMap_.get(fieldName.toLowerCase()); |
| } |
| |
| public void clearFields() { |
| fields_.clear(); |
| fieldMap_.clear(); |
| } |
| |
| @Override |
| public boolean equals(Object other) { |
| if (!(other instanceof StructType)) return false; |
| StructType otherStructType = (StructType) other; |
| return otherStructType.getFields().equals(fields_); |
| } |
| |
| @Override |
| public void toThrift(TColumnType container) { |
| TTypeNode node = new TTypeNode(); |
| container.types.add(node); |
| Preconditions.checkNotNull(fields_); |
| Preconditions.checkState(!fields_.isEmpty()); |
| node.setType(TTypeNodeType.STRUCT); |
| node.setStruct_fields(new ArrayList<>()); |
| for (StructField field: fields_) { |
| field.toThrift(container, node); |
| } |
| } |
| } |