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/**
028 * The implementation of the {@link TerminalPrinter} interface.
029 */
030@InterfaceAudience.Private
031public class TerminalPrinterImpl implements TerminalPrinter {
032  private final ScreenBuffer screenBuffer;
033  private int row;
034  private int column;
035
036  private final Attributes attributes = new Attributes();
037
038  TerminalPrinterImpl(ScreenBuffer screenBuffer, int startRow) {
039    this.screenBuffer = Objects.requireNonNull(screenBuffer);
040    this.row = startRow;
041  }
042
043  @Override
044  public TerminalPrinter print(String value) {
045    screenBuffer.putString(column, row, value, attributes);
046    column += value.length();
047    return this;
048  }
049
050  @Override
051  public TerminalPrinter startHighlight() {
052    attributes.setForegroundColor(Color.BLACK);
053    attributes.setBackgroundColor(Color.WHITE);
054    return this;
055  }
056
057  @Override
058  public TerminalPrinter stopHighlight() {
059    attributes.setForegroundColor(Color.WHITE);
060    attributes.setBackgroundColor(Color.BLACK);
061    return this;
062  }
063
064  @Override
065  public TerminalPrinter startBold() {
066    attributes.setBold(true);
067    return this;
068  }
069
070  @Override
071  public TerminalPrinter stopBold() {
072    attributes.setBold(false);
073    return this;
074  }
075
076  @Override
077  public void endOfLine() {
078    screenBuffer.endOfLine(column, row);
079    row += 1;
080    column = 0;
081  }
082}