001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.hbtop.terminal.impl;
019
020import java.util.Objects;
021import org.apache.hadoop.hbase.hbtop.terminal.Attributes;
022import org.apache.hadoop.hbase.hbtop.terminal.Color;
023import org.apache.hadoop.hbase.hbtop.terminal.TerminalPrinter;
024import org.apache.yetus.audience.InterfaceAudience;
025
026/**
027 * An implementation of the {@link TerminalPrinter} interface for normal display mode.
028 */
029@InterfaceAudience.Private
030public class TerminalPrinterImpl implements TerminalPrinter {
031  private final ScreenBuffer screenBuffer;
032  private int row;
033  private int column;
034
035  private final Attributes attributes = new Attributes();
036
037  TerminalPrinterImpl(ScreenBuffer screenBuffer, int startRow) {
038    this.screenBuffer = Objects.requireNonNull(screenBuffer);
039    this.row = startRow;
040  }
041
042  @Override
043  public TerminalPrinter print(String value) {
044    screenBuffer.putString(column, row, value, attributes);
045    column += value.length();
046    return this;
047  }
048
049  @Override
050  public TerminalPrinter startHighlight() {
051    attributes.setForegroundColor(Color.BLACK);
052    attributes.setBackgroundColor(Color.WHITE);
053    return this;
054  }
055
056  @Override
057  public TerminalPrinter stopHighlight() {
058    attributes.setForegroundColor(Color.WHITE);
059    attributes.setBackgroundColor(Color.BLACK);
060    return this;
061  }
062
063  @Override
064  public TerminalPrinter startBold() {
065    attributes.setBold(true);
066    return this;
067  }
068
069  @Override
070  public TerminalPrinter stopBold() {
071    attributes.setBold(false);
072    return this;
073  }
074
075  @Override
076  public void endOfLine() {
077    screenBuffer.endOfLine(column, row);
078    row += 1;
079    column = 0;
080  }
081}