parquet.column.ColumnDescriptor Maven / Gradle / Ivy
/**
* Copyright 2012 Twitter, Inc.
*
* Licensed 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 parquet.column;
import java.util.Arrays;
import parquet.schema.PrimitiveType.PrimitiveTypeName;
/**
* Describes a column's type as well as its position in its containing schema.
*
* @author Julien Le Dem
*
*/
public class ColumnDescriptor implements Comparable {
private final String[] path;
private final PrimitiveTypeName type;
private final int typeLength;
private final int maxRep;
private final int maxDef;
/**
*
* @param path the path to the leaf field in the schema
* @param type the type of the field
* @param maxRep the maximum repetition level for that path
* @param maxDef the maximum definition level for that path
*/
public ColumnDescriptor(String[] path, PrimitiveTypeName type, int maxRep,
int maxDef) {
this(path, type, 0, maxRep, maxDef);
}
/**
*
* @param path the path to the leaf field in the schema
* @param type the type of the field
* @param maxRep the maximum repetition level for that path
* @param maxDef the maximum definition level for that path
*/
public ColumnDescriptor(String[] path, PrimitiveTypeName type,
int typeLength, int maxRep, int maxDef) {
super();
this.path = path;
this.type = type;
this.typeLength = typeLength;
this.maxRep = maxRep;
this.maxDef = maxDef;
}
/**
* @return the path to the leaf field in the schema
*/
public String[] getPath() {
return path;
}
/**
* @return the maximum repetition level for that path
*/
public int getMaxRepetitionLevel() {
return maxRep;
}
/**
* @return the maximum definition level for that path
*/
public int getMaxDefinitionLevel() {
return maxDef;
}
/**
* @return the type of that column
*/
public PrimitiveTypeName getType() {
return type;
}
/**
* @return the size of the type
**/
public int getTypeLength() {
return typeLength;
}
@Override
public int hashCode() {
return Arrays.hashCode(path);
}
@Override
public boolean equals(Object obj) {
return Arrays.equals(path, ((ColumnDescriptor)obj).path);
}
@Override
public int compareTo(ColumnDescriptor o) {
// TODO(julien): this will fail if o.path.length < this.path.length
for (int i = 0; i < path.length; i++) {
int compareTo = path[i].compareTo(o.path[i]);
if (compareTo != 0) {
return compareTo;
}
}
return 0;
}
@Override
public String toString() {
return Arrays.toString(path) + " " + type;
}
}