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.screen;
019
020import edu.umd.cs.findbugs.annotations.Nullable;
021import java.util.Objects;
022import org.apache.hadoop.hbase.hbtop.terminal.KeyPress;
023import org.apache.hadoop.hbase.hbtop.terminal.Terminal;
024import org.apache.hadoop.hbase.hbtop.terminal.TerminalPrinter;
025import org.apache.hadoop.hbase.hbtop.terminal.TerminalSize;
026import org.apache.yetus.audience.InterfaceAudience;
027
028
029/**
030 * An abstract class for {@link ScreenView} that has the common useful methods and the default
031 * implementations for the abstract methods.
032 */
033@InterfaceAudience.Private
034public abstract class AbstractScreenView implements ScreenView {
035
036  private final Screen screen;
037  private final Terminal terminal;
038
039  public AbstractScreenView(Screen screen, Terminal terminal) {
040    this.screen = Objects.requireNonNull(screen);
041    this.terminal = Objects.requireNonNull(terminal);
042  }
043
044  @Override
045  public void init() {
046  }
047
048  @Override
049  public ScreenView handleKeyPress(KeyPress keyPress) {
050    return this;
051  }
052
053  @Override
054  public ScreenView handleTimer() {
055    return this;
056  }
057
058  protected Screen getScreen() {
059    return screen;
060  }
061
062  protected Terminal getTerminal() {
063    return terminal;
064  }
065
066  protected void setTimer(long delay) {
067    screen.setTimer(delay);
068  }
069
070  protected void cancelTimer() {
071    screen.cancelTimer();
072  }
073
074  protected TerminalPrinter getTerminalPrinter(int startRow) {
075    return terminal.getTerminalPrinter(startRow);
076  }
077
078  protected TerminalSize getTerminalSize() {
079    return terminal.getSize();
080  }
081
082  @Nullable
083  protected TerminalSize doResizeIfNecessary() {
084    return terminal.doResizeIfNecessary();
085  }
086
087  public void clearTerminal() {
088    terminal.clear();
089  }
090
091  public void refreshTerminal() {
092    terminal.refresh();
093  }
094
095  public void hideCursor() {
096    terminal.hideCursor();
097  }
098
099  public void setCursorPosition(int column, int row) {
100    terminal.setCursorPosition(column, row);
101  }
102}