Introducing Spring Framework

Chapter 2 ■ Working with Classes and Dependencies
Let’s start by defining your Document file (see Listing 2-1).
Listing 2-1. Document.java
package com.apress.isf.java.model;
import java.util.Date;
public class Document {
private String name;
private Type type;
private String location;
private Date created;
private Date modified;
}
//Setters/Getters omitted
Your Document class (Listing 2-1) has a one-to-one relationship with the Type class. The Type class
(see Listing 2-2) defines the type of document: a PDF, a note, or a web document.
Listing 2-2. Type.java
package com.apress.isf.java.model;
public class Type {
private String name;
private String desc;
private String extension;
}
//Setters/Getters omitted
Listing 2-3 shows your SearchEngine class that will use the Document class and the Type relationship. With this
class, you can look for a specific type and retrieve all the relevant documents.
Listing 2-3. SearchEngine.java
package com.apress.isf.java.service;
public interface SearchEngine {
public List findByType(Type documentType);
public List listAll();
}
Once you have your base classes, it’s time to create the implementation of the SearchEngine class interface,
which for now is a simple class that will already have some of the documents listed (see Listing 2-4). You can find all of
these files in /ch02/src.
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