build JavaPoet models and compile / load and use dynamic instances at runtime with Adhoc

com.squareup.javapoet.adhoc.JavaPoetAdhocTest.java

package com.squareup.javapoet.adhoc;

import com.squareup.javapoet.*;
import javax.lang.model.element.Modifier;
import junit.framework.TestCase;
import run.adhoc.*;

/**
 * Show how to work with the JavaPoetAdhoc abstraction, to compile/load and
 * use dynamically build code from JavaPoet models.
 * 
 * @author Eric
 */
public class JavaPoetAdhocTest extends TestCase {
    
    MethodSpec main = MethodSpec.methodBuilder("main")
        .addModifiers(Modifier.PUBLIC, Modifier.STATIC)
        .returns(void.class)
        .addParameter(String[].class, "args")
        .addStatement("$T.out.println($S)", System.class, "Hello, JavaPoet!")
        .build();
    
    MethodSpec instanceM = MethodSpec.methodBuilder("getIDouble")
        .addModifiers(Modifier.PUBLIC)
        .returns(int.class)
        .addCode("return i+i;")
        .build();
    
    //this is a simple Type in JavaParser
    TypeSpec helloWorld = TypeSpec.classBuilder("HelloWorld")
            .addModifiers(Modifier.PUBLIC, Modifier.FINAL)
            .addMethod(main) //static main method          
            .addMethod(instanceM)
            .addField(int.class, "i", Modifier.PUBLIC) 
            .addField(int.class, "ID", Modifier.PUBLIC, Modifier.STATIC)
            .build();
    
    //this is the "top level" JavaParser type
    JavaFile javapoetModel = JavaFile.builder("com.example.helloworld", helloWorld)
            .build();
    
    
    public void testIntegrationToWithJavaPoet(){        
        //compile & load the JavaPoet model as a new Class
        Adhoc adhoc = JavaPoetAdhoc.INSTANCE.load(javapoetModel);  //compiled loaded and ready to use
        
        //build & proxy a new instance of "com.example.helloworld.HelloWorld.class"
        Proxy p = adhoc.proxy(javapoetModel);
        p.set("i", 100); //set instance var
        assertEquals(100, p.get("i"));//get instance var   
        assertEquals(200, p.call("getIDouble")); //call an instance method
        p.main(); //call the static main method
    }
}

Integration code for JavaPoet & AdHoc Tools