GeturlFrame.java

/////////////////////////////////////////////////////////////////////////////
// Copyright (c) 1998, California Institute of Technology.  
// ALL RIGHTS RESERVED.   U.S. Government Sponsorship acknowledged. 
//
// Please read the full copyright notice in the file COPYRIGHT
// in this directory.
//
// Author: Jake Hamby, NASA/Jet Propulsion Laboratory
//         Jake.Hamby@jpl.nasa.gov
/////////////////////////////////////////////////////////////////////////////

package dods.util.geturl.gui;
import dods.dap.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;

/** Geturl frame. */
public class GeturlFrame extends Frame {
  /** True if we are an applet. */
  protected boolean isApplet;

  /** The TextField containing the URL to retrieve. */
  protected TextField urlField;

  /** The TextArea where output should be written. */
  protected TextArea outputArea;

  /** The "Get DAS", "Get DDS", and "Get Data" buttons. */
  protected Button getDASButton, getDDSButton, getDataButton;

  public GeturlFrame(boolean isApplet) {
    super("DODS Geturl Applet");
    setSize(640, 480);
    this.isApplet = isApplet;

    // add URL TextField, buttons, and output TextArea
    GridBagLayout gbl = new GridBagLayout();
    GridBagConstraints gbc = new GridBagConstraints();
    setLayout(gbl);
    
    gbc.anchor = GridBagConstraints.EAST;
    gbc.gridwidth = 1;
    gbc.gridy = 0;
    Label urlLabel = new Label("URL:");
    gbl.setConstraints(urlLabel, gbc);
    add(urlLabel);

    gbc.anchor = GridBagConstraints.WEST;
    gbc.gridwidth = 4;
    urlField = new TextField(70);
    gbl.setConstraints(urlField, gbc);
    add(urlField);

    gbc.gridwidth = 1;
    gbc.gridy = 1;
    getDASButton = new Button("Get DAS");
    getDASButton.addActionListener(new GetDASListener());
    gbl.setConstraints(getDASButton, gbc);
    add(getDASButton);

    getDDSButton = new Button("Get DDS");
    getDDSButton.addActionListener(new GetDDSListener());
    gbl.setConstraints(getDDSButton, gbc);
    add(getDDSButton);

    getDataButton = new Button("Get Data");
    getDataButton.addActionListener(new GetDataListener());
    gbl.setConstraints(getDataButton, gbc);
    add(getDataButton);

    gbc.gridwidth = 5;
    gbc.gridy = 2;
    gbc.weightx = 1.0;
    gbc.weighty = 1.0;
    gbc.insets = new Insets(0, 5, 0, 5); // 5 pixel insets on left and right
    outputArea = new TextArea(100, 200);
    outputArea.setEditable(false);
    gbl.setConstraints(outputArea, gbc);
    add(outputArea);
    
    // set listener for window close
    addWindowListener(new WindowClosedListener(this));

    // finally, show window
    show();
  }

  /**
   * A helper method to enable or disable the other buttons while the user
   * is downloading, so they don't click multiple times.
   * @param b if true, enable the buttons; else, disable them.
   */
  private void setButtonsEnabled(boolean b) {
    getDASButton.setEnabled(b);
    getDDSButton.setEnabled(b);
    getDataButton.setEnabled(b);
  }

  private class GetDASListener implements ActionListener, Runnable {
    public void actionPerformed(ActionEvent evt) {
      try {
	// deactivate the other buttons so the user doesn't click them now
	setButtonsEnabled(false);
	// run DConnect in a separate thread from AWT event thread
	Thread runThread = new Thread(this);
	runThread.start();
      }
      catch (IllegalThreadStateException e) {
	outputArea.setText(e.toString());
	setButtonsEnabled(true);
      }
    }

    public void run() {
      try {
	DConnect url = new DConnect(urlField.getText());
	DAS das = url.getDAS();
	CharArrayWriter aw = new CharArrayWriter();
	das.print(new PrintWriter(aw));
	outputArea.setText(aw.toString());
	// reactivate the other buttons
	setButtonsEnabled(true);
      }
      catch (Exception e) {
	outputArea.setText(e.toString());
	setButtonsEnabled(true);
      }
    }
  }

  private class GetDDSListener implements ActionListener, Runnable {
    public void actionPerformed(ActionEvent evt) {
      try {
	// deactivate the other buttons so the user doesn't click them now
	setButtonsEnabled(false);
	// run DConnect in a separate thread from AWT event thread
	Thread runThread = new Thread(this);
	runThread.start();
      }
      catch (IllegalThreadStateException e) {
	outputArea.setText(e.toString());
	setButtonsEnabled(true);
      }
    }

    public void run() {
      try {
	DConnect url = new DConnect(urlField.getText());
	DDS dds = url.getDDS();
	CharArrayWriter aw = new CharArrayWriter();
	dds.print(new PrintWriter(aw));
	outputArea.setText(aw.toString());
	// reactivate the other buttons
	setButtonsEnabled(true);
      }
      catch (Exception e) {
	outputArea.setText(e.toString());
	setButtonsEnabled(true);
      }
    }
  }

  private class GetDataListener implements ActionListener, Runnable {
    public void actionPerformed(ActionEvent evt) {
      try {
	// deactivate the other buttons so the user doesn't click them now
	setButtonsEnabled(false);
	// run DConnect in a separate thread from AWT event thread
	// NOTE: StatusWindow cancel button won't work otherwise!
	Thread runThread = new Thread(this);
	runThread.start();
      }
      catch (IllegalThreadStateException e) {
	outputArea.setText(e.toString());
	setButtonsEnabled(true);
      }
    }

    public void run() {
      try {
	DConnect url = new DConnect(urlField.getText());
	DataDDS dds = url.getData(new StatusWindow(urlField.getText()));
	CharArrayWriter aw = new CharArrayWriter();
	dds.printVal(new PrintWriter(aw));
	outputArea.setText(aw.toString());
	// reactivate the other buttons
	setButtonsEnabled(true);
      }
      catch (Exception e) {
	outputArea.setText(e.toString());
	setButtonsEnabled(true);
      }
    }
  }

  private class WindowClosedListener extends WindowAdapter {
    GeturlFrame myFrame;

    WindowClosedListener(GeturlFrame myFrame) {
      this.myFrame = myFrame;
    }
    public void windowClosing(WindowEvent evt) {
      myFrame.dispose();
      if (myFrame.isApplet == false)
	System.exit(0);
    }
  }
}