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joshzambalesjoshzambales
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added intercepting filter
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-289
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14 files changed

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-289
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‎README.md‎

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@@ -430,7 +430,7 @@ Presentation Tier patterns are the top-most level of the application, this is co
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## <a name="intercepting-filter">Intercepting Filter</a> [&#8593;](#list-of-design-patterns)
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**Intent:** Provide pluggable filters to conduct necessary pre-processing and post-processing to requests from a client to a target
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![alt text](https://github.com/joshzambales/java-design-patterns/blob/master/intercepting-filter/etc/Intercepting-filter.png "Intercepting Filter")
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![alt text](https://github.com/iluwatar/java-design-patterns/blob/master/intercepting-filter/etc/Intercepting-filter.png "Intercepting Filter")
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**Applicability:** Use the Intercepting Filter pattern when
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* a system uses pre-processing or post-processing requests

‎intercepting-filter/pom.xml‎

Lines changed: 18 additions & 74 deletions
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@@ -1,74 +1,18 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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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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<packaging>pom</packaging>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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</properties>
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<modules>
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<module>abstract-factory</module>
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<module>builder</module>
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<module>factory-method</module>
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<module>prototype</module>
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<module>singleton</module>
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<module>adapter</module>
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<module>bridge</module>
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<module>composite</module>
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<module>decorator</module>
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<module>facade</module>
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<module>flyweight</module>
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<module>proxy</module>
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<module>chain</module>
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<module>command</module>
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<module>interpreter</module>
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<module>iterator</module>
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<module>mediator</module>
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<module>memento</module>
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<module>model-view-presenter</module>
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<module>observer</module>
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<module>state</module>
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<module>strategy</module>
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<module>template-method</module>
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<module>visitor</module>
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<module>double-checked-locking</module>
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<module>servant</module>
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<module>service-locator</module>
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<module>null-object</module>
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<module>event-aggregator</module>
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<module>callback</module>
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<module>execute-around</module>
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<module>property</module>
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</modules>
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<dependencyManagement>
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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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</dependencies>
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</dependencyManagement>
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<build>
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<plugins>
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<!-- Tell maven to compile using Java 1.7 -->
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.0</version>
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<configuration>
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<source>1.7</source>
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<target>1.7</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>
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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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<artifactId>intercepting-filter</artifactId>
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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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<scope>test</scope>
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</dependency>
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</dependencies>
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</project>

‎intercepting-filter/src/main/AddressFilter.java‎

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@@ -0,0 +1,14 @@
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/**
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* Concrete implementation of filter
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*
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* @author joshzambales
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*
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*/
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public class AddressFilter implements Filter{
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public String execute(String[] request){
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if(request[2].equals("")){
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return null;
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}else return request[2];
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}
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}

‎intercepting-filter/src/main/App.java‎

Lines changed: 7 additions & 214 deletions
Original file line numberDiff line numberDiff line change
@@ -3,6 +3,13 @@
33
import javax.swing.table.*;
44
import java.awt.*;
55
import java.awt.event.*;
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/**
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*
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* This is an app that checks whether the order request is valid through pre-processing done via Filters
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* Each field has its own corresponding Filter
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* @author joshzambales
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*
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*/
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public class App{
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public static void main(String[] args){
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FilterManager filterManager = new FilterManager(new Target());
@@ -17,229 +24,15 @@ public static void main(String[] args){
1724
}
1825
}
1926

20-
interface Filter{
21-
public String execute(String[] request);
22-
}
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class NameFilter implements Filter{
25-
public String execute(String[] request){
26-
if(request[0].equals("") || request[0].matches(".*[^\\w|\\s]+.*")){
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return null;
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}else return request[0];
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}
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}
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class ContactFilter implements Filter{
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public String execute(String[] request){
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if(request[1].equals("") || request[1].matches(".*[^\\d]+.*") || request[1].length() != 11){
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return null;
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}else return request[1];
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}
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}
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class AddressFilter implements Filter{
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public String execute(String[] request){
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if(request[2].equals("")){
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return null;
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}else return request[2];
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}
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}
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class DepositFilter implements Filter{
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public String execute(String[] request){
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if(request[3].equals("")){
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return null;
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}else return request[3];
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}
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}
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class OrderFilter implements Filter{
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public String execute(String[] request){
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if(request[4].equals("")){
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return null;
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}else return request[4];
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}
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}
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class Target extends JFrame{
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JTable jt;
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JScrollPane jsp;
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DefaultTableModel dtm;
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JButton del;
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public Target(){
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super("Order System");
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setDefaultCloseOperation(EXIT_ON_CLOSE);
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setSize(640,480);
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dtm = new DefaultTableModel(new Object[]{"Name", "Contact Number", "Address", "Deposit Number", "Order"},0);
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jt = new JTable(dtm);
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del = new JButton("Delete");
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setup();
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}
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private void setup(){
79-
setLayout(new BorderLayout());
80-
JPanel bot = new JPanel();
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add(jt.getTableHeader(), BorderLayout.NORTH);
82-
bot.setLayout(new BorderLayout());
83-
bot.add(del, BorderLayout.EAST);
84-
add(bot, BorderLayout.SOUTH);
85-
jsp = new JScrollPane(jt);
86-
jsp.setPreferredSize(new Dimension(500,250));
87-
add(jsp, BorderLayout.CENTER);
8827

89-
del.addActionListener(new DListener());
9028

91-
JRootPane rootPane = SwingUtilities.getRootPane(del);
92-
rootPane.setDefaultButton(del);
93-
setVisible(true);
94-
}
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public void execute(String[] request){
96-
//System.out.println(request[4]);
97-
dtm.addRow(new Object[]{request[0],request[1],request[2],request[3],request[4]});
98-
}
99-
100-
class DListener implements ActionListener{
101-
@Override
102-
public void actionPerformed(ActionEvent e){
103-
int temp = jt.getSelectedRow();
104-
if(temp == -1) return;
105-
int temp2 = jt.getSelectedRowCount();
106-
for(int i = 0; i < temp2; i++){
107-
dtm.removeRow(temp);
108-
}
109-
}
110-
}
111-
}
11229

113-
class FilterChain{
114-
private ArrayList<Filter> filters = new ArrayList<Filter>();
115-
private Target target;
11630

117-
public void addFilter(Filter filter){
118-
filters.add(filter);
119-
}
120-
121-
public String execute(String request){
122-
String tempout[] = new String[filters.size()];
123-
124-
String tempin[] = request.split("&");
125-
int i = 0;
126-
try{
127-
for(Filter filter:filters){
128-
tempout[i] = null;
129-
tempout[i++] = filter.execute(tempin);
130-
//System.out.println(tempout[i]);
131-
}
132-
}catch(Exception e){
133-
return "NOT ENOUGHT INPUT";
134-
}
135-
136-
if(tempout[4] == null){
137-
return "INVALID ORDER!";
138-
}else if(tempout[3] == null){
139-
return "INVALID DEPOSIT NUMBER!";
140-
}else if(tempout[2] == null){
141-
return "INVALID ADRDESS!";
142-
}else if(tempout[1] == null){
143-
return "INVALID Contact Number!";
144-
}else if(tempout[0] == null){
145-
return "INVALID Name!";
146-
}else{
147-
target.execute(tempout);
148-
return "RUNNING...";
149-
}
150-
}
15131

152-
public void setTarget(Target target){
153-
this.target = target;
154-
}
155-
}
15632

157-
class FilterManager{
158-
FilterChain filterChain;
15933

160-
public FilterManager(Target target){
161-
filterChain = new FilterChain();
162-
filterChain.setTarget(target);
163-
}
164-
public void setFilter(Filter filter){
165-
filterChain.addFilter(filter);
166-
}
167-
public String filterRequest(String request){
168-
return filterChain.execute(request);
169-
}
170-
}
17134

172-
class Client extends JFrame{
173-
FilterManager filterManager;
174-
JLabel jl;
175-
JTextField[] jtfarr;
176-
JTextArea[] jtaarr;
177-
JButton[] buttarr;
178-
public Client(){
179-
super("Client System");
180-
setDefaultCloseOperation(EXIT_ON_CLOSE);
181-
setSize(300,300);
182-
jl = new JLabel("RUNNING...");
183-
jtfarr = new JTextField[3];
184-
for(int i = 0; i < 3; i++){
185-
jtfarr[i] = new JTextField();
186-
}
187-
jtaarr = new JTextArea[2];
188-
for(int i = 0; i < 2; i++){
189-
jtaarr[i] = new JTextArea();
190-
}
191-
buttarr = new JButton[2];
192-
buttarr[0] = new JButton("Clear");
193-
buttarr[1] = new JButton("Process");
19435

195-
setup();
196-
}
197-
private void setup(){
198-
setLayout(new BorderLayout());
199-
JPanel panel = new JPanel();
200-
add(jl,BorderLayout.SOUTH);
201-
add(panel, BorderLayout.CENTER);
202-
panel.setLayout(new GridLayout(6,2));
203-
panel.add(new JLabel("Name"));
204-
panel.add(jtfarr[0]);
205-
panel.add(new JLabel("Contact Number"));
206-
panel.add(jtfarr[1]);
207-
panel.add(new JLabel("Address"));
208-
panel.add(jtaarr[0]);
209-
panel.add(new JLabel("Deposit Number"));
210-
panel.add(jtfarr[2]);
211-
panel.add(new JLabel("Order"));
212-
panel.add(jtaarr[1]);
213-
panel.add(buttarr[0]);
214-
panel.add(buttarr[1]);
21536

216-
buttarr[0].addActionListener(new ActionListener(){
217-
@Override
218-
public void actionPerformed(ActionEvent e){
219-
for(JTextArea i : jtaarr){
220-
i.setText("");
221-
}
222-
for(JTextField i : jtfarr){
223-
i.setText("");
224-
}
225-
}
226-
});
22737

228-
buttarr[1].addActionListener(new ActionListener(){
229-
@Override
230-
public void actionPerformed(ActionEvent e){
231-
jl.setText(sendRequest(jtfarr[0].getText()+"&"+jtfarr[1].getText()+"&"+jtaarr[0].getText()+"&"+jtfarr[2].getText()+"&"+jtaarr[1].getText()));
232-
}
233-
});
23438

235-
JRootPane rootPane = SwingUtilities.getRootPane(buttarr[1]);
236-
rootPane.setDefaultButton(buttarr[1]);
237-
setVisible(true);
238-
}
239-
public void setFilterManager(FilterManager filterManager){
240-
this.filterManager = filterManager;
241-
}
242-
public String sendRequest(String request){
243-
return filterManager.filterRequest(request);
244-
}
245-
}

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