UserView.java

import java.util.ArrayList;
import javax.swing.DefaultListModel;
import javax.swing.JOptionPane;

/**
 *
 * @author Denzel Galamgam
 */
public class UserView extends javax.swing.JPanel implements Observer
{

    /**
     * Creates new form UserView
     */
    private User current;
    public UserView(User u) 
    {
        current = u;
        current.getFeed().register(this);
        initComponents();
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        jPanel1 = new javax.swing.JPanel();
        followBtn = new javax.swing.JButton();
        followID = new javax.swing.JTextField();
        jPanel2 = new javax.swing.JPanel();
        jScrollPane1 = new javax.swing.JScrollPane();
        following = new javax.swing.JList();
        jPanel3 = new javax.swing.JPanel();
        tweetBox = new javax.swing.JTextField();
        tweetBtn = new javax.swing.JButton();
        jPanel4 = new javax.swing.JPanel();
        jScrollPane2 = new javax.swing.JScrollPane();
        newsFeed = new javax.swing.JList();

        followBtn.setText("Follow User");
        followBtn.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                followBtnActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(followID)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(followBtn, javax.swing.GroupLayout.PREFERRED_SIZE, 181, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap())
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(followBtn, javax.swing.GroupLayout.DEFAULT_SIZE, 28, Short.MAX_VALUE)
                    .addComponent(followID))
                .addContainerGap())
        );

        jPanel2.setBorder(javax.swing.BorderFactory.createTitledBorder("Following"));

        following.setModel(new javax.swing.DefaultListModel(){
        } );
        updateFollowing();
        jScrollPane1.setViewportView(following);

        javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
        jPanel2.setLayout(jPanel2Layout);
        jPanel2Layout.setHorizontalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel2Layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jScrollPane1)
                .addContainerGap())
        );
        jPanel2Layout.setVerticalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel2Layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 100, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        tweetBtn.setText("Post Tweet");
        tweetBtn.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                tweetBtnActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout jPanel3Layout = new javax.swing.GroupLayout(jPanel3);
        jPanel3.setLayout(jPanel3Layout);
        jPanel3Layout.setHorizontalGroup(
            jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel3Layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(tweetBox, javax.swing.GroupLayout.PREFERRED_SIZE, 175, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(tweetBtn, javax.swing.GroupLayout.DEFAULT_SIZE, 179, Short.MAX_VALUE)
                .addContainerGap())
        );
        jPanel3Layout.setVerticalGroup(
            jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel3Layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(tweetBtn, javax.swing.GroupLayout.DEFAULT_SIZE, 28, Short.MAX_VALUE)
                    .addComponent(tweetBox))
                .addContainerGap())
        );

        jPanel4.setBorder(javax.swing.BorderFactory.createTitledBorder("News Feed"));

        newsFeed.setModel(new javax.swing.DefaultListModel() {
        });
        updateFeed();
        jScrollPane2.setViewportView(newsFeed);

        javax.swing.GroupLayout jPanel4Layout = new javax.swing.GroupLayout(jPanel4);
        jPanel4.setLayout(jPanel4Layout);
        jPanel4Layout.setHorizontalGroup(
            jPanel4Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jScrollPane2)
        );
        jPanel4Layout.setVerticalGroup(
            jPanel4Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jScrollPane2, javax.swing.GroupLayout.DEFAULT_SIZE, 87, Short.MAX_VALUE)
        );

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(jPanel2, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(jPanel3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(jPanel4, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jPanel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(jPanel4, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addContainerGap())
        );
    }// </editor-fold>//GEN-END:initComponents

    private void followBtnActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_followBtnActionPerformed
        String id = followID.getText();
        if(User.exists(id) && !current.getID().equals(id) && !current.isFollowing(id))
        {
            current.follow(id);
            updateFollowing();
        }
        else if(current.getID().equals(id))
        {
            JOptionPane.showMessageDialog(null, "Cannot follow self.");
        }
        else if(current.isFollowing(id))
        {
            JOptionPane.showMessageDialog(null, "Already following " + id);
        }
        else
        {
            JOptionPane.showMessageDialog(null, "User with ID " + id + " does not exist!");
        }
    }//GEN-LAST:event_followBtnActionPerformed

    private void tweetBtnActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_tweetBtnActionPerformed
        current.tweet(tweetBox.getText());
    }//GEN-LAST:event_tweetBtnActionPerformed
    private void updateFollowing()
    {
        DefaultListModel model = new DefaultListModel();
        ArrayList<String> follow = current.getFollowing();
        for(String s : follow)
        {
            model.addElement(s);
        }
        following.setModel(model);
        following.setSelectedIndex(0);
    }
    private void updateFeed()
    {
        DefaultListModel model = new DefaultListModel();
        ArrayList<String> feed = current.getFeed().getFeed();
        for(String s : feed)
        {
            model.addElement(s);
        }
        newsFeed.setModel(model);
        newsFeed.setSelectedIndex(0);
    }

    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JButton followBtn;
    private javax.swing.JTextField followID;
    private javax.swing.JList following;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPanel jPanel2;
    private javax.swing.JPanel jPanel3;
    private javax.swing.JPanel jPanel4;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JScrollPane jScrollPane2;
    private javax.swing.JList newsFeed;
    private javax.swing.JTextField tweetBox;
    private javax.swing.JButton tweetBtn;
    // End of variables declaration//GEN-END:variables

    @Override
    public void update(String msg, Subject sub) {
        updateFeed();
    }
}