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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.tajo.schema;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import org.apache.tajo.type.Type;
import org.apache.tajo.util.StringUtils;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.Objects;
import static org.apache.tajo.common.TajoDataTypes.Type.RECORD;
/**
* A field is a pair of a name and a type. Schema is an ordered list of fields.
*/
public class Schema implements Iterable<Schema.NamedType> {
private final ImmutableList<NamedType> namedTypes;
public Schema(Collection<NamedType> namedTypes) {
this.namedTypes = ImmutableList.copyOf(namedTypes);
}
public static Schema Schema(NamedType...fields) {
return new Schema(Arrays.asList(fields));
}
public static Schema Schema(Collection<NamedType> fields) {
return new Schema(fields);
}
@Override
public String toString() {
return StringUtils.join(namedTypes, ",");
}
public static NamedStructType Struct(QualifiedIdentifier name, NamedType... namedTypes) {
return Struct(name, Arrays.asList(namedTypes));
}
public static NamedStructType Struct(QualifiedIdentifier name, Collection<NamedType> namedTypes) {
return new NamedStructType(name, namedTypes);
}
public static NamedPrimitiveType Field(QualifiedIdentifier name, Type type) {
return new NamedPrimitiveType(name, type);
}
@Override
public Iterator<NamedType> iterator() {
return namedTypes.iterator();
}
public static abstract class NamedType {
protected final QualifiedIdentifier name;
public NamedType(QualifiedIdentifier name) {
this.name = name;
}
public QualifiedIdentifier name() {
return this.name;
}
@Override
public int hashCode() {
return Objects.hash(name);
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof NamedType) {
NamedType other = (NamedType) obj;
return this.name.equals(other.name);
}
return false;
}
}
public static class NamedPrimitiveType extends NamedType {
private final Type type;
public NamedPrimitiveType(QualifiedIdentifier name, Type type) {
super(name);
Preconditions.checkArgument(type.baseType() != RECORD);
this.type = type;
}
public Type type() {
return type;
}
@Override
public String toString() {
return name + " " + type;
}
@Override
public int hashCode() {
return Objects.hash(name, type);
}
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (obj instanceof NamedPrimitiveType) {
NamedPrimitiveType other = (NamedPrimitiveType) obj;
return super.equals(other) && this.type.equals(type);
}
return false;
}
}
public static class NamedStructType extends NamedType {
private final ImmutableList<NamedType> fields;
public NamedStructType(QualifiedIdentifier name, Collection<NamedType> fields) {
super(name);
this.fields = ImmutableList.copyOf(fields);
}
public Collection<NamedType> fields() {
return this.fields;
}
@Override
public String toString() {
return name + " record (" + StringUtils.join(fields, ",") + ")";
}
@Override
public int hashCode() {
return Objects.hash(name, fields);
}
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (obj instanceof NamedStructType) {
NamedStructType other = (NamedStructType) obj;
return super.equals(other) && fields.equals(other.fields);
}
return false;
}
}
}