| // 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 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.Preconditions; |
| |
| /** |
| * Describes a MAP type. MAP types have a scalar key and an arbitrarily-typed value. |
| */ |
| public class MapType extends Type { |
| private final Type keyType_; |
| private final Type valueType_; |
| |
| public MapType(Type keyType, Type valueType) { |
| Preconditions.checkNotNull(keyType); |
| Preconditions.checkNotNull(valueType); |
| keyType_ = keyType; |
| valueType_ = valueType; |
| } |
| |
| public Type getKeyType() { return keyType_; } |
| public Type getValueType() { return valueType_; } |
| |
| @Override |
| public boolean equals(Object other) { |
| if (!(other instanceof MapType)) return false; |
| MapType otherMapType = (MapType) other; |
| return otherMapType.keyType_.equals(keyType_) && |
| otherMapType.valueType_.equals(valueType_); |
| } |
| |
| @Override |
| public String toSql(int depth) { |
| if (depth >= MAX_NESTING_DEPTH) return "MAP<...>"; |
| return String.format("MAP<%s,%s>", |
| keyType_.toSql(depth + 1), valueType_.toSql(depth + 1)); |
| } |
| |
| @Override |
| protected String prettyPrint(int lpad) { |
| String leftPadding = StringUtils.repeat(' ', lpad); |
| if (valueType_.isScalarType()) return leftPadding + toSql(); |
| // Pass in the padding to make sure nested fields are aligned properly, |
| // even if we then strip the top-level padding. |
| String structStr = valueType_.prettyPrint(lpad); |
| structStr = structStr.substring(lpad); |
| return String.format("%sMAP<%s,%s>", leftPadding, keyType_.toSql(), structStr); |
| } |
| |
| @Override |
| public void toThrift(TColumnType container) { |
| TTypeNode node = new TTypeNode(); |
| container.types.add(node); |
| Preconditions.checkNotNull(keyType_); |
| Preconditions.checkNotNull(valueType_); |
| node.setType(TTypeNodeType.MAP); |
| keyType_.toThrift(container); |
| valueType_.toThrift(container); |
| } |
| } |