added intercepting filter
This commit is contained in:
Josh
parent
f753d68d1b
commit
6d4e47311a
@ -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> [↑](#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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**Applicability:** Use the Intercepting Filter pattern when
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* a system uses pre-processing or post-processing requests
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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>
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14
intercepting-filter/src/main/AddressFilter.java
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14
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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}
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@ -3,6 +3,13 @@ import javax.swing.*;
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import javax.swing.table.*;
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import java.awt.*;
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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());
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@ -17,229 +24,15 @@ public class App{
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}
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}
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interface Filter{
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public String execute(String[] request);
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}
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class NameFilter implements Filter{
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public String execute(String[] request){
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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(){
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setLayout(new BorderLayout());
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JPanel bot = new JPanel();
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add(jt.getTableHeader(), BorderLayout.NORTH);
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bot.setLayout(new BorderLayout());
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bot.add(del, BorderLayout.EAST);
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add(bot, BorderLayout.SOUTH);
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jsp = new JScrollPane(jt);
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jsp.setPreferredSize(new Dimension(500,250));
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add(jsp, BorderLayout.CENTER);
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del.addActionListener(new DListener());
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JRootPane rootPane = SwingUtilities.getRootPane(del);
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rootPane.setDefaultButton(del);
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setVisible(true);
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}
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public void execute(String[] request){
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//System.out.println(request[4]);
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dtm.addRow(new Object[]{request[0],request[1],request[2],request[3],request[4]});
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}
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class DListener implements ActionListener{
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@Override
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public void actionPerformed(ActionEvent e){
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int temp = jt.getSelectedRow();
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if(temp == -1) return;
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int temp2 = jt.getSelectedRowCount();
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for(int i = 0; i < temp2; i++){
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dtm.removeRow(temp);
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}
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}
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}
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}
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class FilterChain{
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private ArrayList<Filter> filters = new ArrayList<Filter>();
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private Target target;
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public void addFilter(Filter filter){
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filters.add(filter);
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}
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public String execute(String request){
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String tempout[] = new String[filters.size()];
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String tempin[] = request.split("&");
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int i = 0;
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try{
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for(Filter filter:filters){
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tempout[i] = null;
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tempout[i++] = filter.execute(tempin);
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//System.out.println(tempout[i]);
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}
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}catch(Exception e){
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return "NOT ENOUGHT INPUT";
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}
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if(tempout[4] == null){
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return "INVALID ORDER!";
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}else if(tempout[3] == null){
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return "INVALID DEPOSIT NUMBER!";
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}else if(tempout[2] == null){
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return "INVALID ADRDESS!";
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}else if(tempout[1] == null){
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return "INVALID Contact Number!";
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}else if(tempout[0] == null){
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return "INVALID Name!";
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}else{
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target.execute(tempout);
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return "RUNNING...";
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}
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}
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public void setTarget(Target target){
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this.target = target;
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}
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}
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class FilterManager{
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FilterChain filterChain;
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public FilterManager(Target target){
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filterChain = new FilterChain();
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filterChain.setTarget(target);
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}
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public void setFilter(Filter filter){
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filterChain.addFilter(filter);
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}
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public String filterRequest(String request){
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return filterChain.execute(request);
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}
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}
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class Client extends JFrame{
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FilterManager filterManager;
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JLabel jl;
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JTextField[] jtfarr;
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JTextArea[] jtaarr;
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JButton[] buttarr;
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public Client(){
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super("Client System");
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setDefaultCloseOperation(EXIT_ON_CLOSE);
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setSize(300,300);
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jl = new JLabel("RUNNING...");
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jtfarr = new JTextField[3];
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for(int i = 0; i < 3; i++){
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jtfarr[i] = new JTextField();
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}
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jtaarr = new JTextArea[2];
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for(int i = 0; i < 2; i++){
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jtaarr[i] = new JTextArea();
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}
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buttarr = new JButton[2];
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buttarr[0] = new JButton("Clear");
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buttarr[1] = new JButton("Process");
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setup();
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}
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private void setup(){
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setLayout(new BorderLayout());
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JPanel panel = new JPanel();
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add(jl,BorderLayout.SOUTH);
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add(panel, BorderLayout.CENTER);
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panel.setLayout(new GridLayout(6,2));
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panel.add(new JLabel("Name"));
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panel.add(jtfarr[0]);
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panel.add(new JLabel("Contact Number"));
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panel.add(jtfarr[1]);
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panel.add(new JLabel("Address"));
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panel.add(jtaarr[0]);
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panel.add(new JLabel("Deposit Number"));
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panel.add(jtfarr[2]);
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panel.add(new JLabel("Order"));
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panel.add(jtaarr[1]);
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panel.add(buttarr[0]);
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panel.add(buttarr[1]);
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buttarr[0].addActionListener(new ActionListener(){
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@Override
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public void actionPerformed(ActionEvent e){
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for(JTextArea i : jtaarr){
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i.setText("");
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}
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for(JTextField i : jtfarr){
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i.setText("");
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}
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}
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});
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buttarr[1].addActionListener(new ActionListener(){
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@Override
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public void actionPerformed(ActionEvent e){
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jl.setText(sendRequest(jtfarr[0].getText()+"&"+jtfarr[1].getText()+"&"+jtaarr[0].getText()+"&"+jtfarr[2].getText()+"&"+jtaarr[1].getText()));
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}
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});
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JRootPane rootPane = SwingUtilities.getRootPane(buttarr[1]);
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rootPane.setDefaultButton(buttarr[1]);
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setVisible(true);
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}
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public void setFilterManager(FilterManager filterManager){
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this.filterManager = filterManager;
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}
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public String sendRequest(String request){
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return filterManager.filterRequest(request);
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}
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}
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86
intercepting-filter/src/main/Client.java
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86
intercepting-filter/src/main/Client.java
Normal file
@ -0,0 +1,86 @@
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import java.util.*;
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import javax.swing.*;
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import javax.swing.table.*;
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import java.awt.*;
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import java.awt.event.*;
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/**
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* The Client class is responsible for handling the input and running them through filters inside the filterManager
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*
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* This is where Filters come to play as the client pre-processes the request before being displayed in the Target
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*
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* @author joshzambales
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*
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*/
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public class Client extends JFrame{
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FilterManager filterManager;
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JLabel jl;
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JTextField[] jtFields;
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JTextArea[] jtAreas;
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JButton clearButton, processButton;
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public Client(){
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super("Client System");
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setDefaultCloseOperation(EXIT_ON_CLOSE);
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setSize(300,300);
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jl = new JLabel("RUNNING...");
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jtFields = new JTextField[3];
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for(int i = 0; i < 3; i++){
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jtFields[i] = new JTextField();
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}
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jtAreas = new JTextArea[2];
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for(int i = 0; i < 2; i++){
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jtAreas[i] = new JTextArea();
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}
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clearButton = new JButton("Clear");
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processButton = new JButton("Process");
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setup();
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}
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private void setup(){
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setLayout(new BorderLayout());
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JPanel panel = new JPanel();
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add(jl,BorderLayout.SOUTH);
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add(panel, BorderLayout.CENTER);
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panel.setLayout(new GridLayout(6,2));
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panel.add(new JLabel("Name"));
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panel.add(jtFields[0]);
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panel.add(new JLabel("Contact Number"));
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panel.add(jtFields[1]);
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panel.add(new JLabel("Address"));
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panel.add(jtAreas[0]);
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panel.add(new JLabel("Deposit Number"));
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panel.add(jtFields[2]);
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panel.add(new JLabel("Order"));
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panel.add(jtAreas[1]);
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panel.add(clearButton);
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panel.add(processButton);
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clearButton.addActionListener(new ActionListener(){
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@Override
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public void actionPerformed(ActionEvent e){
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for(JTextArea i : jtAreas){
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i.setText("");
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}
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for(JTextField i : jtFields){
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i.setText("");
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}
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}
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});
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processButton.addActionListener(new ActionListener(){
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@Override
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public void actionPerformed(ActionEvent e){
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jl.setText(sendRequest(jtFields[0].getText()+"&"+jtFields[1].getText()+"&"+jtAreas[0].getText()+"&"+jtFields[2].getText()+"&"+jtAreas[1].getText()));
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}
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});
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JRootPane rootPane = SwingUtilities.getRootPane(processButton);
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rootPane.setDefaultButton(processButton);
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setVisible(true);
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}
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public void setFilterManager(FilterManager filterManager){
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this.filterManager = filterManager;
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}
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public String sendRequest(String request){
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return filterManager.filterRequest(request);
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}
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}
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13
intercepting-filter/src/main/ContactFilter.java
Normal file
13
intercepting-filter/src/main/ContactFilter.java
Normal file
@ -0,0 +1,13 @@
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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 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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13
intercepting-filter/src/main/DepositFilter.java
Normal file
13
intercepting-filter/src/main/DepositFilter.java
Normal file
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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 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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8
intercepting-filter/src/main/Filter.java
Normal file
8
intercepting-filter/src/main/Filter.java
Normal file
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/**
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* Filter interface
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* @author joshzambales
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*
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*/
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public interface Filter{
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public String execute(String[] request);
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}
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48
intercepting-filter/src/main/FilterChain.java
Normal file
48
intercepting-filter/src/main/FilterChain.java
Normal file
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import java.util.*;
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/**
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* Filter Chain carries multiple filters and help to execute them in defined order on target.
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*
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* @author joshzambales
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*/
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||||
public class FilterChain{
|
||||
private ArrayList<Filter> filters = new ArrayList<Filter>();
|
||||
private Target target;
|
||||
|
||||
public FilterChain(Target target){
|
||||
this.target = target;
|
||||
}
|
||||
public void addFilter(Filter filter){
|
||||
filters.add(filter);
|
||||
}
|
||||
|
||||
public String execute(String request){
|
||||
String tempout[] = new String[filters.size()];
|
||||
|
||||
String tempin[] = request.split("&");
|
||||
int i = 0;
|
||||
try{
|
||||
for(Filter filter:filters){
|
||||
tempout[i] = null;
|
||||
tempout[i++] = filter.execute(tempin);
|
||||
}
|
||||
}catch(Exception e){
|
||||
return "NOT ENOUGHT INPUT";
|
||||
}
|
||||
|
||||
if(tempout[4] == null){
|
||||
return "INVALID ORDER!";
|
||||
}else if(tempout[3] == null){
|
||||
return "INVALID DEPOSIT NUMBER!";
|
||||
}else if(tempout[2] == null){
|
||||
return "INVALID ADRDESS!";
|
||||
}else if(tempout[1] == null){
|
||||
return "INVALID Contact Number!";
|
||||
}else if(tempout[0] == null){
|
||||
return "INVALID Name!";
|
||||
}else{
|
||||
target.execute(tempout);
|
||||
return "RUNNING...";
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
23
intercepting-filter/src/main/FilterManager.java
Normal file
23
intercepting-filter/src/main/FilterManager.java
Normal file
@ -0,0 +1,23 @@
|
||||
import java.util.*;
|
||||
import javax.swing.*;
|
||||
import javax.swing.table.*;
|
||||
import java.awt.*;
|
||||
import java.awt.event.*;
|
||||
/**
|
||||
* Filter Manager manages the filters and Filter Chain.
|
||||
* @author joshzambales
|
||||
*
|
||||
*/
|
||||
public class FilterManager{
|
||||
FilterChain filterChain;
|
||||
|
||||
public FilterManager(Target target){
|
||||
filterChain = new FilterChain(target);
|
||||
}
|
||||
public void setFilter(Filter filter){
|
||||
filterChain.addFilter(filter);
|
||||
}
|
||||
public String filterRequest(String request){
|
||||
return filterChain.execute(request);
|
||||
}
|
||||
}
|
||||
7
intercepting-filter/src/main/NameFilter.java
Normal file
7
intercepting-filter/src/main/NameFilter.java
Normal file
@ -0,0 +1,7 @@
|
||||
public class NameFilter implements Filter{
|
||||
public String execute(String[] request){
|
||||
if(request[0].equals("") || request[0].matches(".*[^\\w|\\s]+.*")){
|
||||
return null;
|
||||
}else return request[0];
|
||||
}
|
||||
}
|
||||
13
intercepting-filter/src/main/OrderFilter.java
Normal file
13
intercepting-filter/src/main/OrderFilter.java
Normal file
@ -0,0 +1,13 @@
|
||||
/**
|
||||
* Concrete implementation of filter
|
||||
*
|
||||
* @author joshzambales
|
||||
*
|
||||
*/
|
||||
public class OrderFilter implements Filter{
|
||||
public String execute(String[] request){
|
||||
if(request[4].equals("")){
|
||||
return null;
|
||||
}else return request[4];
|
||||
}
|
||||
}
|
||||
58
intercepting-filter/src/main/Target.java
Normal file
58
intercepting-filter/src/main/Target.java
Normal file
@ -0,0 +1,58 @@
|
||||
import java.util.*;
|
||||
import javax.swing.*;
|
||||
import javax.swing.table.*;
|
||||
import java.awt.*;
|
||||
import java.awt.event.*;
|
||||
/**
|
||||
* This is where the requests are displayed after being validated by filters.
|
||||
*
|
||||
* @author mjoshzambales
|
||||
*
|
||||
*/
|
||||
public class Target extends JFrame{
|
||||
JTable jt;
|
||||
JScrollPane jsp;
|
||||
DefaultTableModel dtm;
|
||||
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();
|
||||
}
|
||||
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());
|
||||
|
||||
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]});
|
||||
}
|
||||
|
||||
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);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
x
Reference in New Issue
Block a user