Connection.java example

package communication;

import java.io.IOException;
import java.util.List;

import javax.swing.JLabel;
import javax.swing.JOptionPane;

import api.Item;
import api.User;

public class Connection {
    /** User information */
    protected String oauth_token;

    /** Proxy related members */
    protected boolean proxyActive;
    protected String proxyAddress;
    protected String proxyPort;

    /** Connection related members */
    protected boolean isConnected;

    /** User related members */
    protected User user;

    /**
     * @return the mProxyActive
     */
    public boolean isProxyActive() {
        return proxyActive;
    }

    /**
     * 
     * @param proxyActive
     *            the mProxyActive to set
     * @throws Exception
     *             if proxy settings are not ok
     */
    public void setProxyActive( boolean proxyActive ) throws Exception {
        this.proxyActive = proxyActive;
        if ( proxyActive ) {
            if ( proxyAddress == null || proxyPort == null )
                throw new Exception( "Proxy settings are not ok!" );
            System.setProperty( "http.proxySet", "true" );
            System.setProperty( "http.proxyHost", proxyAddress );
            System.setProperty( "http.proxyPort", proxyPort );
            System.setProperty( "https.proxySet", "true" );
            System.setProperty( "https.proxyHost", proxyAddress );
            System.setProperty( "https.proxyPort", proxyPort );
        }
        else {
            System.setProperty( "http.proxySet", "false" );
            System.setProperty( "http.proxyHost", "" );
            System.setProperty( "http.proxyPort", "" );
            System.setProperty( "https.proxySet", "false" );
            System.setProperty( "https.proxyHost", "" );
            System.setProperty( "https.proxyPort", "" );
        }
    }

    /**
     * @return the mProxyAddress
     */
    public String getProxyAddress() {
        return proxyAddress;
    }

    /**
     * @param mProxyAddress
     *            the mProxyAddress to set
     */
    public void setProxyAddress( String mProxyAddress ) {
        this.proxyAddress = mProxyAddress;
    }

    /**
     * @return the mProxyPort
     */
    public String getProxyPort() {
        return proxyPort;
    }

    /**
     * @param proxyPort
     *            the mProxyPort to set
     */
    public void setProxyPort( String proxyPort ) {
        this.proxyPort = proxyPort;
    }

    /**
     * @return mUser
     */
    public User getUser() {
        return user;
    }

    /**
     * @return the isConnected
     */
    public boolean isConnected() {
        return isConnected;
    }

    public boolean connect() {
        if ( oauth_token != null ) {
            try {
                RequestorHolder.getRequestor().setThreadCredentials( oauth_token );
                user = new User().info();
                isConnected = true;
            }
            catch ( Exception e ) {
                disconnect();
                if ( e instanceof IOException
                        && ( e.toString().contains( "HTTP response code: 401" ) || e.toString().contains(
                                "HTTP response code: 400" ) ) )
                    JOptionPane
                            .showMessageDialog(
                                    null,
                                    new JLabel(
                                            "<html><body><div style=\"text-align:left;margin-left:10px;\">Wrong user token.<br />Please check the user settings.</div></body></html>" ),
                                    "Error", JOptionPane.ERROR_MESSAGE );
                else
                    JOptionPane
                            .showMessageDialog(
                                    null,
                                    new JLabel(
                                            "<html><body><div style=\"text-align:left;margin-left:25px;\">Connection error !<br />Try again later.</div></body></html>" ),
                                    "Error", JOptionPane.ERROR_MESSAGE );
                System.out.println( e.toString() );
            }
        }
        return isConnected;
    }

    public boolean refresh() {
        if ( oauth_token != null ) {
            try {
                RequestorHolder.getRequestor().setThreadCredentials( oauth_token );
                user = new User().info();
            }
            catch ( Exception e ) {
                System.out.println( e.toString() );
            }
        }
        return isConnected;
    }

    public void disconnect() {
        RequestorHolder.getRequestor().setThreadCredentials( null );
        isConnected = false;
    }

    public List<Item> getRootItems() throws Exception {
        try {
            return new Item().listAll();
        }
        catch ( Exception e ) {
            throw e;
        }
    }

    public List<Item> getChildren( Item item ) throws Exception {
        try {
            return item.listChildren();
        }
        catch ( Exception e ) {
            throw e;
        }
    }
}