JarCastingOverview
A library that automatically generates the source code of the "builder pattern"
It is licensed under MIT.
How to use
Dependency
Add dependency.
<dependency>
<groupId>org.riversun</groupId>
<artifactId>builder-pattern-generator</artifactId>
<version>1.0.0</version>
</dependency>
Example1:Generate "Effective Java" style builder pattern source code.
package examples;
import org.riversun.dp.builder.BuilderPattern;
import org.riversun.dp.builder.Variable;
public class Example1 {
public static void main(String[] args) {
String sourceCode = new BuilderPattern.Builder()
.packageName("com.example")
.className("Person")
// specify variable type and name
.addVariable(new Variable("String", "name"))
.addVariable(new Variable("String", "address"))
// In the case of "List<>", name of singular and plural can be specified
.addVariable(new Variable("List<String>", "hobbies", "hobby"))
.build()
.get();
System.out.println(sourceCode);
}
}
Result
You can get following source code. If you specify a variable of type "List<>", the method named "add[Variable]" is also automatically generated.
package com.example;
import java.util.ArrayList;
import java.util.List;
public class Person {
private String name;
private String address;
private List<String> hobbies;
public static class Builder {
private String name;
private String address;
private List<String> hobbies = new ArrayList<String>();
public Builder() {
}
Builder(String name, String address, List<String> hobbies) {
this.name = name;
this.address = address;
this.hobbies = hobbies;
}
public Builder name(String name){
this.name = name;
return Builder.this;
}
public Builder address(String address){
this.address = address;
return Builder.this;
}
public Builder hobbies(List<String> hobbies){
this.hobbies = hobbies;
return Builder.this;
}
public Builder addHobby(String hobby){
this.hobbies.add(hobby);
return Builder.this;
}
public Person build() {
if (name == null || address == null || hobbies == null) {
throw new NullPointerException();
}
return new Person(this);
}
}
private Person(Builder builder) {
this.name = builder.name;
this.address = builder.address;
this.hobbies = builder.hobbies;
}
public void doSomething() {
// do something
}
}
Example2:Save generated code to directory.
package examples;
import java.io.File;
import org.riversun.dp.builder.BuilderPattern;
import org.riversun.dp.builder.Variable;
public class Example2 {
public static void main(String[] args) {
new BuilderPattern.Builder()
.packageName("com.example")
.className("Person")
// specify variable type and name
.addVariable(new Variable("String", "name"))
.addVariable(new Variable("String", "address"))
// In the case of "List<>", name of singular and plural can be specified
.addVariable(new Variable("List<String>", "hobbies", "hobby"))
.build()
.save(new File("c:/temp"));
}
}