package org.cyclopsgroup.jmxterm.io;
   
   import org.apache.commons.lang3.Validate;
   
   import java.io.File;
   import java.io.FileNotFoundException;
   import java.io.FileReader;
   import java.io.IOException;
   import java.io.LineNumberReader;
  
  /**
   * Implementation of CommandInput with given File
   * 
   * @author <a href="mailto:jiaqi.guo@gmail.com">Jiaqi Guo</a>
   */
  public class FileCommandInput extends CommandInput {
    private final LineNumberReader in;
  
    /**
     * Read input from a given file
     * 
     * @param inputFile Given input file
     * @throws FileNotFoundException Thrown when file doesn't exist
     */
    public FileCommandInput(File inputFile) throws FileNotFoundException {
      Validate.notNull(inputFile, "Input can't be NULL");
      this.in = new LineNumberReader(new FileReader(inputFile));
    }
  
    @Override
    public void close() throws IOException {
      in.close();
    }
  
    @Override
    public String readLine() throws IOException {
      return in.readLine();
    }
  
    @Override
    public String readMaskedString(String prompt) throws IOException {
      throw new UnsupportedOperationException("Reading password from a file is not supported");
    }
  }