/**
* 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.engine.planner;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.annotations.Expose;
import org.apache.tajo.algebra.Aggregation;
import org.apache.tajo.catalog.Column;
public class GroupElement implements Cloneable {
@Expose
private Aggregation.GroupType type;
@Expose private Column[] columns;
@SuppressWarnings("unused")
public GroupElement() {
// for gson
}
public GroupElement(Aggregation.GroupType type, Column[] columns) {
this.type = type;
this.columns = columns;
}
public Aggregation.GroupType getType() {
return this.type;
}
public Column [] getColumns() {
return this.columns;
}
public String toString() {
Gson gson = new GsonBuilder().excludeFieldsWithoutExposeAnnotation()
.setPrettyPrinting().create();
return gson.toJson(this);
}
public Object clone() throws CloneNotSupportedException {
GroupElement groups = (GroupElement) super.clone();
groups.type = type;
groups.columns = new Column[columns.length];
for (int i = 0; i < columns.length; i++) {
groups.columns[i++] = (Column) columns[i].clone();
}
return groups;
}
}