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GenerateBuilderTest.java
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GenerateBuilderTest.java
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package gr.patouchas.builder;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.PrintStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
import org.junit.Test;
public class GenerateBuilderTest {
final List<Class> classes = Arrays.asList(User.class, Category .class);
// the file will be saved under the projectJavaCode/src/main/java/package/name/ - if package contains the word
// domain, it will be replace by builder ie:
// pakage name: eu.iri.lmx.core.model.domain.configuration.descriptives
// location to save:
// D:\source\project\src\main\java\model\builder\configuration\descriptives\DescriptivesBuilder.java
final String projectJavaCode = System.getProperty("user.dir").concat("\\");// "D:\\source\\project\\src\\main\\java\\model\\";
final String methodPrefix = "with";
final String builderMethodName = "build";
@Test
public void createBuilders() throws FileNotFoundException {
this.generate(this.classes);
}
private void generate(final List<Class> classes) throws FileNotFoundException {
for (final Class clazz : classes) {
final String builderName = clazz.getSimpleName() + "Builder";
final String classNameLowerFistLetter = clazz.getSimpleName().substring(0, 1).toLowerCase() + clazz.getSimpleName().substring(1);
final String packg = clazz.getPackage().getName();
String text = "package " + packg + ";\n";
text = text + "public class " + builderName + "{" + "\n";
text = text + "private final " + clazz.getSimpleName() + " " + classNameLowerFistLetter + ";" + "\n";
text = text + "public " + builderName + "(){\nthis." + classNameLowerFistLetter + " = new " + clazz.getSimpleName() + "(); \n}" + "\n";
text = text + Arrays.asList(clazz.getDeclaredFields()).stream().filter(s -> !s.getName().contains("serialVersionUID")).map(f -> {
final String fieldNameLowerFirstLetter = f.getName().substring(0, 1).toUpperCase() + f.getName().substring(1);
final String generic = this.generatePostFixForGenericTypes(f);
final String methodName = this.findMethodName(clazz, fieldNameLowerFirstLetter);
return this.generaterBuilderMethod(builderName, this.methodPrefix, fieldNameLowerFirstLetter, classNameLowerFistLetter, generic,
methodName, f);
}).collect(Collectors.joining("\n"));
text = text + "public " + clazz.getSimpleName() + " " + this.builderMethodName + "(){\n return this." + classNameLowerFistLetter
+ ";\n}\n}" + "\n";
final String fileLocation = this.projectJavaCode.concat("src\\main\\java\\")
.concat(packg.replace(".", "\\")//
// ##############################
// ##############################
// ##############################
// ##############################
// Check here for folder location
// it is the same as package,
// just replacing the "domain"
// with "builder" in path
// ##############################
// ##############################
.replace("domain", "persistence")//
// ##############################
.concat("\\"))
+ builderName + ".java";
System.out.println("Saving Builder under: \n" + fileLocation);
try (PrintStream out = new PrintStream(new FileOutputStream(fileLocation))) {
out.print(text);
}
}
}
private String generatePostFixForGenericTypes(final Field f) {
String generic = "";
String separator = "";
if (f.getGenericType() instanceof ParameterizedType) {
generic = "<";
final ParameterizedType aType = (ParameterizedType) f.getGenericType();
final Type[] fieldArgTypes = aType.getActualTypeArguments();
for (final Type fieldArgType : fieldArgTypes) {
try {
final Class fieldArgClass = (Class) fieldArgType;
generic = generic + separator + fieldArgClass.getSimpleName();
} catch (final Exception e) {
generic = generic + separator + fieldArgType.getTypeName();
}
separator = ", ";
}
generic = generic + ">";
}
return generic;
}
private String findMethodName(final Class clazz, final String fieldNameLowerFirstLetter) {
return Arrays.asList(clazz.getMethods()).stream().map(Method::getName)
.filter(s -> s.toLowerCase().equals("set" + fieldNameLowerFirstLetter.toLowerCase())
|| s.toLowerCase().equals("is" + fieldNameLowerFirstLetter.toLowerCase()))
.findAny().orElse("methodNotFound");
}
private String generaterBuilderMethod(final String builderName, final String methodPrefix, final String fieldNameLowerFirstLetter,
final String classNameLowerFistLetter, final String generic, final String methodName, final Field f) {
return "public " + builderName + " " + methodPrefix + fieldNameLowerFirstLetter + "(final " + f.getType().getSimpleName() + generic + " "
+ f.getName() + ") {\n" + "this." + classNameLowerFistLetter + "." + methodName + "(" + f.getName() + ");\n"
+ "return this;\n" + "}\n";
}
}