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Merge pull request iluwatar#3 from pitsios-s/master
Model-View-Presenter pattern
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‎README.md‎

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* a snapshot of an object's state must be saved so that it can be restored to that state later, and
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* a direct interface to obtaining the state would expose implementation details and break the object's encapsulation
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##Model-View-Presenter
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**Intent:** Apply a "Separation of Concerns" principle in a way that allows developers to build and test user interfaces.
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![alt text](https://github.com/pitsios-s/java-design-patterns/blob/master/model-view-presenter/etc/model-view-presenter.jpg "Model-View-Presenter")
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**Applicability:** Use the Model-View-Presenter in any of the following situations
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* when you want to improve the "Separation of Concerns" principle in presentation logic
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* when a user interface development and testing is necessary.
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##Observer
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**Intent:** Define a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically.
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‎model-view-presenter/etc/data/test.txt‎

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Test line 1
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Test line 2

‎model-view-presenter/etc/model-view-presenter.jpg‎

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‎model-view-presenter/pom.xml‎

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<?xml version="1.0"?>
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<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>com.iluwatar</groupId>
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<artifactId>java-design-patterns</artifactId>
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<version>1.0-SNAPSHOT</version>
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</parent>
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<groupId>com.iluwatar</groupId>
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<artifactId>model-view-presenter</artifactId>
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<version>1.0-SNAPSHOT</version>
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<name>model-view-presenter</name>
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<url>http://maven.apache.org</url>
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<dependencies>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.11</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>net.java.dev.swing-layout</groupId>
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<artifactId>swing-layout</artifactId>
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<version>1.0.2</version>
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</dependency>
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</dependencies>
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</project>

‎model-view-presenter/src/main/java/com/iluwatar/FileLoader.java‎

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package com.iluwatar;
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import java.io.BufferedReader;
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import java.io.File;
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import java.io.FileReader;
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/**
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* Every instance of this class represents the Model component
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* in the Model-View-Presenter architectural pattern.
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*
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* It is responsible for reading and loading the contents of a given file.
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*/
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public class FileLoader {
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/**
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* Indicates if the file is loaded or not.
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*/
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private boolean loaded = false;
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/**
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* The name of the file that we want to load.
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*/
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private String fileName;
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/**
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* Loads the data of the file specified.
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*/
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public String loadData() {
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try {
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BufferedReader br = new BufferedReader(new FileReader(new File(this.fileName)));
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String text = "";
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String line = "";
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while( (line = br.readLine()) != null ) {
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text += line + "\n";
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}
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this.loaded = true;
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br.close();
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return text;
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}
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catch(Exception e) {
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e.printStackTrace();
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}
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return null;
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}
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/**
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* Sets the path of the file to be loaded, to the given value.
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*
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* @param fileName The path of the file to be loaded.
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*/
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public void setFileName(String fileName) {
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this.fileName = fileName;
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}
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/**
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* @return fileName The path of the file to be loaded.
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*/
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public String getFileName() {
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return this.fileName;
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}
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/**
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* @return True, if the file given exists, false otherwise.
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*/
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public boolean fileExists() {
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return new File(this.fileName).exists();
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}
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/**
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* @return True, if the file is loaded, false otherwise.
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*/
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public boolean isLoaded() {
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return this.loaded;
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}
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}

‎model-view-presenter/src/main/java/com/iluwatar/FileSelectorJFrame.java‎

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package com.iluwatar;
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import java.awt.Color;
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import java.awt.event.ActionEvent;
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import java.awt.event.ActionListener;
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import javax.swing.JButton;
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import javax.swing.JFrame;
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import javax.swing.JLabel;
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import javax.swing.JOptionPane;
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import javax.swing.JPanel;
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import javax.swing.JScrollPane;
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import javax.swing.JTextArea;
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import javax.swing.JTextField;
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/**
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* This class is the GUI implementation of the View component
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* In the Model-View-Presenter pattern.
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*/
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public class FileSelectorJFrame extends JFrame implements FileSelectorView, ActionListener {
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/**
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* Default serial version ID.
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*/
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private static final long serialVersionUID = 1L;
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/**
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* The "OK" button for loading the file.
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*/
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private JButton OK;
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/**
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* The cancel button.
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*/
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private JButton cancel;
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/**
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* The information label.
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*/
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private JLabel info;
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/**
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* The contents label.
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*/
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private JLabel contents;
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/**
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* The text field for giving the name of the file
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* that we want to open.
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*/
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private JTextField input;
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/**
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* A text area that will keep the contents of the file opened.
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*/
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private JTextArea area;
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/**
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* The panel that will hold our widgets.
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*/
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private JPanel panel;
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/**
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* The Presenter component that the frame will interact with
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*/
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private FileSelectorPresenter presenter;
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/**
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* The name of the file that we want to read it's contents.
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*/
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private String fileName;
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/**
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* Constructor.
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*/
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public FileSelectorJFrame() {
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super("File Loader");
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this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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this.setLayout(null);
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this.setBounds(100, 100, 500, 200);
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/*
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* Add the panel.
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*/
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this.panel = new JPanel();
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panel.setLayout(null);
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this.add(panel);
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panel.setBounds(0, 0, 500, 200);
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panel.setBackground(Color.LIGHT_GRAY);
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/*
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* Add the info label.
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*/
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this.info = new JLabel("File Name :");
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this.panel.add(info);
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info.setBounds(30, 10, 100, 30);
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/*
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* Add the contents label.
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*/
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this.contents = new JLabel("File contents :");
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this.panel.add(contents);
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this.contents.setBounds(30, 100, 120, 30);
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/*
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* Add the text field.
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*/
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this.input = new JTextField(100);
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this.panel.add(input);
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this.input.setBounds(150, 15, 200, 20);
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/*
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* Add the text area.
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*/
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this.area = new JTextArea(100, 100);
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JScrollPane pane = new JScrollPane(area);
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pane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
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pane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
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this.panel.add(pane);
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this.area.setEditable(false);
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pane.setBounds(150, 100, 250, 80);
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/*
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* Add the OK button.
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*/
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this.OK = new JButton("OK");
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this.panel.add(OK);
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this.OK.setBounds(250, 50, 100, 25);
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this.OK.addActionListener(this);
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/*
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* Add the cancel button.
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*/
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this.cancel = new JButton("Cancel");
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this.panel.add(this.cancel);
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this.cancel.setBounds(380, 50, 100, 25);
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this.cancel.addActionListener(this);
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this.presenter = null;
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this.fileName = null;
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}
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@Override
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public void actionPerformed(ActionEvent e) {
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if(e.getSource() == this.OK) {
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this.fileName = this.input.getText();
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presenter.fileNameChanged();
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presenter.confirmed();
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}
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else if(e.getSource() == this.cancel) {
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presenter.cancelled();
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}
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}
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@Override
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public void open() {
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this.setVisible(true);
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}
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@Override
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public void close() {
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this.dispose();
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}
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@Override
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public boolean isOpened() {
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return this.isVisible();
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}
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@Override
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public void setPresenter(FileSelectorPresenter presenter) {
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this.presenter = presenter;
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}
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@Override
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public FileSelectorPresenter getPresenter() {
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return this.presenter;
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}
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@Override
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public void setFileName(String name) {
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this.fileName = name;
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}
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@Override
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public String getFileName() {
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return this.fileName;
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}
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@Override
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public void showMessage(String message) {
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JOptionPane.showMessageDialog(null, message);
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}
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@Override
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public void displayData(String data) {
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this.area.setText(data);
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}
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}

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