/**
    * 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;
  
  import edu.umd.cs.findbugs.annotations.Nullable;
  import java.util.Objects;
  
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  import org.apache.hadoop.hbase.hbtop.terminal.KeyPress;
  import org.apache.hadoop.hbase.hbtop.terminal.Terminal;
  import org.apache.hadoop.hbase.hbtop.terminal.TerminalPrinter;
  import org.apache.hadoop.hbase.hbtop.terminal.TerminalSize;
  
  /**
   * An abstract class for {@link ScreenView} that has the common useful methods and the default
   * implementations for the abstract methods.
   */
  @InterfaceAudience.Private
  public abstract class AbstractScreenView implements ScreenView {
  
    private final Screen screen;
    private final Terminal terminal;
  
    public AbstractScreenView(Screen screen, Terminal terminal) {
      this.screen = Objects.requireNonNull(screen);
      this.terminal = Objects.requireNonNull(terminal);
    }
  
    @Override
    public void init() {
    }
  
    @Override
    public ScreenView handleKeyPress(KeyPress keyPress) {
      return this;
    }
  
    @Override
    public ScreenView handleTimer() {
      return this;
    }
  
    protected Screen getScreen() {
      return screen;
    }
  
    protected Terminal getTerminal() {
      return terminal;
    }
  
    protected void setTimer(long delay) {
      screen.setTimer(delay);
    }
  
    protected void cancelTimer() {
      screen.cancelTimer();
    }
  
    protected TerminalPrinter getTerminalPrinter(int startRow) {
      return terminal.getTerminalPrinter(startRow);
    }
  
    @Nullable
    protected TerminalSize getTerminalSize() {
      return terminal.getSize();
    }
  
    @Nullable
    protected TerminalSize doResizeIfNecessary() {
      return terminal.doResizeIfNecessary();
    }
  
    public void clearTerminal() {
      terminal.clear();
    }
  
    public void refreshTerminal() {
      terminal.refresh();
    }
  
    public void hideCursor() {
      terminal.hideCursor();
    }
  
   public void setCursorPosition(int column, int row) {
     terminal.setCursorPosition(column, row);
   }
 }