1 /**
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18 package org.apache.hadoop.hbase.hbtop.screen.top;
19
20 import java.util.Objects;
21 import org.apache.hadoop.hbase.classification.InterfaceAudience;
22 import org.apache.hadoop.hbase.hbtop.field.Field;
23
24 /**
25 * Represents headers for the metrics in the top screen.
26 */
27 @InterfaceAudience.Private
28 public class Header {
29 private final Field field;
30 private final int length;
31
32 public Header(Field field, int length) {
33 this.field = Objects.requireNonNull(field);
34 this.length = length;
35 }
36
37 public String format() {
38 return "%" + (field.isLeftJustify() ? "-" : "") + length + "s";
39 }
40
41 public Field getField() {
42 return field;
43 }
44
45 public int getLength() {
46 return length;
47 }
48 }