/*
 * 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.hadoop.hbase.hbtop.screen.top;

import java.util.Objects;
import org.apache.hadoop.hbase.hbtop.field.Field;
import org.apache.yetus.audience.InterfaceAudience;

/**
 * Represents headers for the metrics in the top screen.
 */
@InterfaceAudience.Private
public class Header {
  private final Field field;
  private final int length;

  public Header(Field field, int length) {
    this.field = Objects.requireNonNull(field);
    this.length = length;
  }

  public String format() {
    return "%" + (field.isLeftJustify() ? "-" : "") + length + "s";
  }

  public Field getField() {
    return field;
  }

  public int getLength() {
    return length;
  }
}
