gaspersic/java-design-patterns
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Reformat rest of the design patterns - Issue #224

Browse Source
This commit is contained in:
Ankur Kaushal
2015-11-01 21:29:13 -05:00
parent 449340bd2b
commit 306b1f3d31
337 changed files with 6744 additions and 6851 deletions
Download Patch File Download Diff File Expand all files Collapse all files

70
intercepting-filter/src/main/java/com/iluwatar/intercepting/filter/AbstractFilter.java
View File

@@ -1,46 +1,44 @@
package com.iluwatar.intercepting.filter;
/**
* Base class for order processing filters.
* Handles chain management.
* Base class for order processing filters. Handles chain management.
*
*/
public abstract class AbstractFilter implements Filter {
private Filter next;
public AbstractFilter() {
}
private Filter next;
public AbstractFilter(Filter next) {
this.next = next;
}
@Override
public void setNext(Filter filter) {
this.next = filter;
}
@Override
public Filter getNext() {
return next;
}
public AbstractFilter() {}
@Override
public Filter getLast() {
Filter last = this;
while (last.getNext() != null) {
last = last.getNext();
}
return last;
}
@Override
public String execute(Order order) {
if (getNext() != null) {
return getNext().execute(order);
} else {
return "";
}
}
public AbstractFilter(Filter next) {
this.next = next;
}
@Override
public void setNext(Filter filter) {
this.next = filter;
}
@Override
public Filter getNext() {
return next;
}
@Override
public Filter getLast() {
Filter last = this;
while (last.getNext() != null) {
last = last.getNext();
}
return last;
}
@Override
public String execute(Order order) {
if (getNext() != null) {
return getNext().execute(order);
} else {
return "";
}
}
}

23
intercepting-filter/src/main/java/com/iluwatar/intercepting/filter/AddressFilter.java
View File

@@ -1,19 +1,20 @@
package com.iluwatar.intercepting.filter;
/**
* Concrete implementation of filter
* This filter is responsible for checking/filtering the input in the address field.
* Concrete implementation of filter This filter is responsible for checking/filtering the input in
* the address field.
*
* @author joshzambales
*
*/
public class AddressFilter extends AbstractFilter {
@Override
public String execute(Order order) {
String result = super.execute(order);
if (order.getAddress() == null || order.getAddress().isEmpty()) {
return result + "Invalid address! ";
} else
return result;
}
@Override
public String execute(Order order) {
String result = super.execute(order);
if (order.getAddress() == null || order.getAddress().isEmpty()) {
return result + "Invalid address! ";
} else
return result;
}
}

70
intercepting-filter/src/main/java/com/iluwatar/intercepting/filter/App.java
View File

@@ -2,50 +2,46 @@ package com.iluwatar.intercepting.filter;
/**
*
* When a request enters a Web application, it often must pass several entrance
* tests prior to the main processing stage. For example,
* - Has the client been authenticated?
* - Does the client have a valid session?
* - Is the client's IP address from a trusted network?
* - Does the request path violate any constraints?
* - What encoding does the client use to send the data?
* - Do we support the browser type of the client?
* Some of these checks are tests, resulting in a yes or no answer that determines
* whether processing will continue. Other checks manipulate the incoming data
* When a request enters a Web application, it often must pass several entrance tests prior to the
* main processing stage. For example, - Has the client been authenticated? - Does the client have a
* valid session? - Is the client's IP address from a trusted network? - Does the request path
* violate any constraints? - What encoding does the client use to send the data? - Do we support
* the browser type of the client? Some of these checks are tests, resulting in a yes or no answer
* that determines whether processing will continue. Other checks manipulate the incoming data
* stream into a form suitable for processing.
* <p>
* The classic solution consists of a series of conditional checks, with any failed
* check aborting the request. Nested if/else statements are a standard strategy,
* but this solution leads to code fragility and a copy-and-paste style of programming,
* because the flow of the filtering and the action of the filters is compiled into
* the application.
* The classic solution consists of a series of conditional checks, with any failed check aborting
* the request. Nested if/else statements are a standard strategy, but this solution leads to code
* fragility and a copy-and-paste style of programming, because the flow of the filtering and the
* action of the filters is compiled into the application.
* <p>
* The key to solving this problem in a flexible and unobtrusive manner is to have a
* simple mechanism for adding and removing processing components, in which each
* component completes a specific filtering action. This is the Intercepting Filter
* pattern in action.
* The key to solving this problem in a flexible and unobtrusive manner is to have a simple
* mechanism for adding and removing processing components, in which each component completes a
* specific filtering action. This is the Intercepting Filter pattern in action.
* <p>
* In this example we check whether the order request is valid through pre-processing
* done via {@link Filter}. Each field has its own corresponding {@link Filter}
* In this example we check whether the order request is valid through pre-processing done via
* {@link Filter}. Each field has its own corresponding {@link Filter}
* <p>
*
* @author joshzambales
*
*/
public class App{
/**
* Program entry point
* @param args command line args
*/
public static void main(String[] args) {
FilterManager filterManager = new FilterManager(new Target());
filterManager.addFilter(new NameFilter());
filterManager.addFilter(new ContactFilter());
filterManager.addFilter(new AddressFilter());
filterManager.addFilter(new DepositFilter());
filterManager.addFilter(new OrderFilter());
public class App {
Client client = new Client();
client.setFilterManager(filterManager);
}
/**
* Program entry point
*
* @param args command line args
*/
public static void main(String[] args) {
FilterManager filterManager = new FilterManager(new Target());
filterManager.addFilter(new NameFilter());
filterManager.addFilter(new ContactFilter());
filterManager.addFilter(new AddressFilter());
filterManager.addFilter(new DepositFilter());
filterManager.addFilter(new OrderFilter());
Client client = new Client();
client.setFilterManager(filterManager);
}
}

148
intercepting-filter/src/main/java/com/iluwatar/intercepting/filter/Client.java
View File

@@ -15,93 +15,95 @@ import javax.swing.JTextField;
import javax.swing.SwingUtilities;
/**
* The Client class is responsible for handling the input and running them through filters inside the {@link FilterManager}.
* The Client class is responsible for handling the input and running them through filters inside
* the {@link FilterManager}.
*
* This is where {@link Filter}s come to play as the client pre-processes the request before being displayed in the {@link Target}.
* This is where {@link Filter}s come to play as the client pre-processes the request before being
* displayed in the {@link Target}.
*
* @author joshzambales
*
*/
public class Client extends JFrame {
private static final long serialVersionUID = 1L;
private static final long serialVersionUID = 1L;
private FilterManager filterManager;
private JLabel jl;
private JTextField[] jtFields;
private JTextArea[] jtAreas;
private JButton clearButton, processButton;
private FilterManager filterManager;
private JLabel jl;
private JTextField[] jtFields;
private JTextArea[] jtAreas;
private JButton clearButton, processButton;
public Client() {
super("Client System");
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(300, 300);
jl = new JLabel("RUNNING...");
jtFields = new JTextField[3];
for (int i = 0; i < 3; i++) {
jtFields[i] = new JTextField();
}
jtAreas = new JTextArea[2];
for (int i = 0; i < 2; i++) {
jtAreas[i] = new JTextArea();
}
clearButton = new JButton("Clear");
processButton = new JButton("Process");
public Client() {
super("Client System");
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(300, 300);
jl = new JLabel("RUNNING...");
jtFields = new JTextField[3];
for (int i = 0; i < 3; i++) {
jtFields[i] = new JTextField();
}
jtAreas = new JTextArea[2];
for (int i = 0; i < 2; i++) {
jtAreas[i] = new JTextArea();
}
clearButton = new JButton("Clear");
processButton = new JButton("Process");
setup();
}
setup();
}
private void setup() {
setLayout(new BorderLayout());
JPanel panel = new JPanel();
add(jl, BorderLayout.SOUTH);
add(panel, BorderLayout.CENTER);
panel.setLayout(new GridLayout(6, 2));
panel.add(new JLabel("Name"));
panel.add(jtFields[0]);
panel.add(new JLabel("Contact Number"));
panel.add(jtFields[1]);
panel.add(new JLabel("Address"));
panel.add(jtAreas[0]);
panel.add(new JLabel("Deposit Number"));
panel.add(jtFields[2]);
panel.add(new JLabel("Order"));
panel.add(jtAreas[1]);
panel.add(clearButton);
panel.add(processButton);
private void setup() {
setLayout(new BorderLayout());
JPanel panel = new JPanel();
add(jl, BorderLayout.SOUTH);
add(panel, BorderLayout.CENTER);
panel.setLayout(new GridLayout(6, 2));
panel.add(new JLabel("Name"));
panel.add(jtFields[0]);
panel.add(new JLabel("Contact Number"));
panel.add(jtFields[1]);
panel.add(new JLabel("Address"));
panel.add(jtAreas[0]);
panel.add(new JLabel("Deposit Number"));
panel.add(jtFields[2]);
panel.add(new JLabel("Order"));
panel.add(jtAreas[1]);
panel.add(clearButton);
panel.add(processButton);
clearButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
for (JTextArea i : jtAreas) {
i.setText("");
}
for (JTextField i : jtFields) {
i.setText("");
}
}
});
clearButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
for (JTextArea i : jtAreas) {
i.setText("");
}
for (JTextField i : jtFields) {
i.setText("");
}
}
});
processButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
Order order = new Order(jtFields[0].getText(), jtFields[1]
.getText(), jtAreas[0].getText(),
jtFields[2].getText(), jtAreas[1].getText());
jl.setText(sendRequest(order));
}
});
processButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
Order order =
new Order(jtFields[0].getText(), jtFields[1].getText(), jtAreas[0].getText(),
jtFields[2].getText(), jtAreas[1].getText());
jl.setText(sendRequest(order));
}
});
JRootPane rootPane = SwingUtilities.getRootPane(processButton);
rootPane.setDefaultButton(processButton);
setVisible(true);
}
JRootPane rootPane = SwingUtilities.getRootPane(processButton);
rootPane.setDefaultButton(processButton);
setVisible(true);
}
public void setFilterManager(FilterManager filterManager) {
this.filterManager = filterManager;
}
public void setFilterManager(FilterManager filterManager) {
this.filterManager = filterManager;
}
public String sendRequest(Order order) {
return filterManager.filterRequest(order);
}
public String sendRequest(Order order) {
return filterManager.filterRequest(order);
}
}

32
intercepting-filter/src/main/java/com/iluwatar/intercepting/filter/ContactFilter.java
View File

@@ -1,24 +1,24 @@
package com.iluwatar.intercepting.filter;
/**
* Concrete implementation of filter
* This filter checks for the contact field in which it checks if the input consist of numbers
* and it also checks if the input follows the length constraint (11 digits)
* Concrete implementation of filter This filter checks for the contact field in which it checks if
* the input consist of numbers and it also checks if the input follows the length constraint (11
* digits)
*
* @author joshzambales
*
*/
public class ContactFilter extends AbstractFilter {
@Override
public String execute(Order order) {
String result = super.execute(order);
if (order.getContactNumber() == null
|| order.getContactNumber().isEmpty()
|| order.getContactNumber().matches(".*[^\\d]+.*")
|| order.getContactNumber().length() != 11) {
return result + "Invalid contact number! ";
} else {
return result;
}
}
@Override
public String execute(Order order) {
String result = super.execute(order);
if (order.getContactNumber() == null || order.getContactNumber().isEmpty()
|| order.getContactNumber().matches(".*[^\\d]+.*")
|| order.getContactNumber().length() != 11) {
return result + "Invalid contact number! ";
} else {
return result;
}
}
}

24
intercepting-filter/src/main/java/com/iluwatar/intercepting/filter/DepositFilter.java
View File

@@ -1,20 +1,20 @@
package com.iluwatar.intercepting.filter;
/**
* Concrete implementation of filter
* This checks for the deposit code
* Concrete implementation of filter This checks for the deposit code
*
* @author joshzambales
*
*/
public class DepositFilter extends AbstractFilter {
@Override
public String execute(Order order) {
String result = super.execute(order);
if (order.getDepositNumber() == null || order.getDepositNumber().isEmpty()) {
return result + "Invalid deposit number! ";
} else {
return result;
}
}
@Override
public String execute(Order order) {
String result = super.execute(order);
if (order.getDepositNumber() == null || order.getDepositNumber().isEmpty()) {
return result + "Invalid deposit number! ";
} else {
return result;
}
}
}

59
intercepting-filter/src/main/java/com/iluwatar/intercepting/filter/Filter.java
View File

@@ -1,37 +1,40 @@
package com.iluwatar.intercepting.filter;
/**
* Filters perform certain tasks prior or after execution of
* request by request handler. In this case, before the request is handled by
* the target, the request undergoes through each Filter
* Filters perform certain tasks prior or after execution of request by request handler. In this
* case, before the request is handled by the target, the request undergoes through each Filter
*
* @author joshzambales
*
*/
public interface Filter {
/**
* Execute order processing filter.
* @param order
* @return empty string on success, otherwise error message.
*/
String execute(Order order);
/**
* Set next filter in chain after this.
* @param filter
*/
void setNext(Filter filter);
/**
* Get next filter in chain after this.
* @return
*/
Filter getNext();
/**
* Get last filter in the chain.
* @return
*/
Filter getLast();
/**
* Execute order processing filter.
*
* @param order
* @return empty string on success, otherwise error message.
*/
String execute(Order order);
/**
* Set next filter in chain after this.
*
* @param filter
*/
void setNext(Filter filter);
/**
* Get next filter in chain after this.
*
* @return
*/
Filter getNext();
/**
* Get last filter in the chain.
*
* @return
*/
Filter getLast();
}

48
intercepting-filter/src/main/java/com/iluwatar/intercepting/filter/FilterChain.java
View File

@@ -1,34 +1,34 @@
package com.iluwatar.intercepting.filter;
package com.iluwatar.intercepting.filter;
/**
* Filter Chain carries multiple filters and help to execute them in defined order on target.
*
* @author joshzambales
*/
public class FilterChain {
private Filter chain;
private final Target target;
public FilterChain(Target target) {
this.target = target;
}
private Filter chain;
public void addFilter(Filter filter) {
if (chain == null) {
chain = filter;
} else {
chain.getLast().setNext(filter);
}
}
private final Target target;
public String execute(Order order) {
if (chain != null) {
return chain.execute(order);
} else {
return "RUNNING...";
}
}
public FilterChain(Target target) {
this.target = target;
}
public void addFilter(Filter filter) {
if (chain == null) {
chain = filter;
} else {
chain.getLast().setNext(filter);
}
}
public String execute(Order order) {
if (chain != null) {
return chain.execute(order);
} else {
return "RUNNING...";
}
}
}

22
intercepting-filter/src/main/java/com/iluwatar/intercepting/filter/FilterManager.java
View File

@@ -7,18 +7,18 @@ package com.iluwatar.intercepting.filter;
*
*/
public class FilterManager {
private FilterChain filterChain;
public FilterManager(Target target) {
filterChain = new FilterChain(target);
}
private FilterChain filterChain;
public void addFilter(Filter filter) {
filterChain.addFilter(filter);
}
public FilterManager(Target target) {
filterChain = new FilterChain(target);
}
public String filterRequest(Order order) {
return filterChain.execute(order);
}
public void addFilter(Filter filter) {
filterChain.addFilter(filter);
}
public String filterRequest(Order order) {
return filterChain.execute(order);
}
}

25
intercepting-filter/src/main/java/com/iluwatar/intercepting/filter/NameFilter.java
View File

@@ -1,21 +1,22 @@
package com.iluwatar.intercepting.filter;
/**
* Concrete implementation of filter. This filter checks if the input in the Name
* field is valid. (alphanumeric)
* Concrete implementation of filter. This filter checks if the input in the Name field is valid.
* (alphanumeric)
*
* @author joshzambales
*
*/
public class NameFilter extends AbstractFilter {
@Override
public String execute(Order order) {
String result = super.execute(order);
if (order.getName() == null || order.getName().isEmpty() || order.getName().matches(".*[^\\w|\\s]+.*")) {
return result + "Invalid order! ";
} else {
return result;
}
}
@Override
public String execute(Order order) {
String result = super.execute(order);
if (order.getName() == null || order.getName().isEmpty()
|| order.getName().matches(".*[^\\w|\\s]+.*")) {
return result + "Invalid order! ";
} else {
return result;
}
}
}

91
intercepting-filter/src/main/java/com/iluwatar/intercepting/filter/Order.java
View File

@@ -6,60 +6,59 @@ package com.iluwatar.intercepting.filter;
*/
public class Order {
private String name;
private String contactNumber;
private String address;
private String depositNumber;
private String order;
public Order() {
}
private String name;
private String contactNumber;
private String address;
private String depositNumber;
private String order;
public Order(String name, String contactNumber, String address, String depositNumber, String order) {
this.name = name;
this.contactNumber = contactNumber;
this.address = address;
this.depositNumber = depositNumber;
this.order = order;
}
public String getName() {
return name;
}
public Order() {}
public void setName(String name) {
this.name = name;
}
public Order(String name, String contactNumber, String address, String depositNumber, String order) {
this.name = name;
this.contactNumber = contactNumber;
this.address = address;
this.depositNumber = depositNumber;
this.order = order;
}
public String getContactNumber() {
return contactNumber;
}
public String getName() {
return name;
}
public void setContactNumber(String contactNumber) {
this.contactNumber = contactNumber;
}
public void setName(String name) {
this.name = name;
}
public String getAddress() {
return address;
}
public String getContactNumber() {
return contactNumber;
}
public void setAddress(String address) {
this.address = address;
}
public void setContactNumber(String contactNumber) {
this.contactNumber = contactNumber;
}
public String getDepositNumber() {
return depositNumber;
}
public String getAddress() {
return address;
}
public void setDepositNumber(String depositNumber) {
this.depositNumber = depositNumber;
}
public void setAddress(String address) {
this.address = address;
}
public String getOrder() {
return order;
}
public String getDepositNumber() {
return depositNumber;
}
public void setOrder(String order) {
this.order = order;
}
public void setDepositNumber(String depositNumber) {
this.depositNumber = depositNumber;
}
public String getOrder() {
return order;
}
public void setOrder(String order) {
this.order = order;
}
}

20
intercepting-filter/src/main/java/com/iluwatar/intercepting/filter/OrderFilter.java
View File

@@ -7,14 +7,14 @@ package com.iluwatar.intercepting.filter;
*
*/
public class OrderFilter extends AbstractFilter {
@Override
public String execute(Order order) {
String result = super.execute(order);
if (order.getOrder() == null || order.getOrder().isEmpty()) {
return result + "Invalid order! ";
} else {
return result;
}
}
@Override
public String execute(Order order) {
String result = super.execute(order);
if (order.getOrder() == null || order.getOrder().isEmpty()) {
return result + "Invalid order! ";
} else {
return result;
}
}
}

92
intercepting-filter/src/main/java/com/iluwatar/intercepting/filter/Target.java
View File

@@ -22,57 +22,57 @@ import javax.swing.table.DefaultTableModel;
*/
public class Target extends JFrame {
private static final long serialVersionUID = 1L;
private static final long serialVersionUID = 1L;
private JTable jt;
private JScrollPane jsp;
private DefaultTableModel dtm;
private JButton del;
private JTable jt;
private JScrollPane jsp;
private DefaultTableModel dtm;
private JButton del;
public Target() {
super("Order System");
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(640, 480);
dtm = new DefaultTableModel(new Object[] { "Name", "Contact Number",
"Address", "Deposit Number", "Order" }, 0);
jt = new JTable(dtm);
del = new JButton("Delete");
setup();
}
public Target() {
super("Order System");
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(640, 480);
dtm =
new DefaultTableModel(new Object[] {"Name", "Contact Number", "Address", "Deposit Number",
"Order"}, 0);
jt = new JTable(dtm);
del = new JButton("Delete");
setup();
}
private void setup() {
setLayout(new BorderLayout());
JPanel bot = new JPanel();
add(jt.getTableHeader(), BorderLayout.NORTH);
bot.setLayout(new BorderLayout());
bot.add(del, BorderLayout.EAST);
add(bot, BorderLayout.SOUTH);
jsp = new JScrollPane(jt);
jsp.setPreferredSize(new Dimension(500, 250));
add(jsp, BorderLayout.CENTER);
private void setup() {
setLayout(new BorderLayout());
JPanel bot = new JPanel();
add(jt.getTableHeader(), BorderLayout.NORTH);
bot.setLayout(new BorderLayout());
bot.add(del, BorderLayout.EAST);
add(bot, BorderLayout.SOUTH);
jsp = new JScrollPane(jt);
jsp.setPreferredSize(new Dimension(500, 250));
add(jsp, BorderLayout.CENTER);
del.addActionListener(new DListener());
del.addActionListener(new DListener());
JRootPane rootPane = SwingUtilities.getRootPane(del);
rootPane.setDefaultButton(del);
setVisible(true);
}
JRootPane rootPane = SwingUtilities.getRootPane(del);
rootPane.setDefaultButton(del);
setVisible(true);
}
public void execute(String[] request) {
dtm.addRow(new Object[] { request[0], request[1], request[2],
request[3], request[4] });
}
public void execute(String[] request) {
dtm.addRow(new Object[] {request[0], request[1], request[2], request[3], request[4]});
}
class DListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
int temp = jt.getSelectedRow();
if (temp == -1)
return;
int temp2 = jt.getSelectedRowCount();
for (int i = 0; i < temp2; i++) {
dtm.removeRow(temp);
}
}
}
class DListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
int temp = jt.getSelectedRow();
if (temp == -1)
return;
int temp2 = jt.getSelectedRowCount();
for (int i = 0; i < temp2; i++) {
dtm.removeRow(temp);
}
}
}
}

10
intercepting-filter/src/test/java/com/iluwatar/intercepting/filter/AppTest.java
View File

@@ -11,9 +11,9 @@ import com.iluwatar.intercepting.filter.App;
*/
public class AppTest {
@Test
public void test() {
String[] args = {};
App.main(args);
}
@Test
public void test() {
String[] args = {};
App.main(args);
}
}