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/*
* 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.drill.exec.record.metadata;
import org.apache.drill.common.types.TypeProtos.DataMode;
import org.apache.drill.common.types.TypeProtos.MajorType;
import org.apache.drill.common.types.TypeProtos.MinorType;
import org.apache.drill.exec.record.MaterializedField;
import java.util.stream.Collectors;
/**
* Describes a map and repeated map. Both are tuples that have a tuple
* schema as part of the column definition.
*/
public class MapColumnMetadata extends AbstractColumnMetadata {
private TupleMetadata parentTuple;
private final TupleSchema mapSchema;
/**
* Build a new map column from the field provided
*
* @param schema materialized field description of the map
*/
public MapColumnMetadata(MaterializedField schema) {
this(schema, null);
}
/**
* Build a map column metadata by cloning the type information (but not
* the children) of the materialized field provided.
*
* @param schema the schema to use
* @param mapSchema parent schema
*/
MapColumnMetadata(MaterializedField schema, TupleSchema mapSchema) {
super(schema);
if (mapSchema == null) {
this.mapSchema = new TupleSchema();
} else {
this.mapSchema = mapSchema;
}
this.mapSchema.bind(this);
}
public MapColumnMetadata(MapColumnMetadata from) {
super(from);
mapSchema = (TupleSchema) from.mapSchema.copy();
}
public MapColumnMetadata(String name, DataMode mode,
TupleSchema mapSchema) {
super(name, MinorType.MAP, mode);
if (mapSchema == null) {
this.mapSchema = new TupleSchema();
} else {
this.mapSchema = mapSchema;
}
}
@Override
public ColumnMetadata copy() {
return new MapColumnMetadata(this);
}
@Override
public void bind(TupleMetadata parentTuple) {
this.parentTuple = parentTuple;
}
@Override
public ColumnMetadata.StructureType structureType() { return ColumnMetadata.StructureType.TUPLE; }
@Override
public TupleMetadata mapSchema() { return mapSchema; }
@Override
public int expectedWidth() { return 0; }
@Override
public boolean isMap() { return true; }
public TupleMetadata parentTuple() { return parentTuple; }
@Override
public ColumnMetadata cloneEmpty() {
return new MapColumnMetadata(name, mode, new TupleSchema());
}
@Override
public MaterializedField schema() {
MaterializedField field = emptySchema();
for (MaterializedField member : mapSchema.toFieldList()) {
field.addChild(member);
}
return field;
}
@Override
public MaterializedField emptySchema() {
return MaterializedField.create(name,
MajorType.newBuilder()
.setMinorType(type)
.setMode(mode)
.build());
}
@Override
public String typeString() {
StringBuilder builder = new StringBuilder();
if (isArray()) {
builder.append("ARRAY<");
}
builder.append("MAP<");
builder.append(mapSchema().toMetadataList().stream()
.map(ColumnMetadata::columnString)
.collect(Collectors.joining(", ")));
builder.append(">");
if (isArray()) {
builder.append(">");
}
return builder.toString();
}
}
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