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package me.snowleo.yaml;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Writer;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import javax.annotation.processing.AbstractProcessor;
import javax.annotation.processing.Filer;
import javax.annotation.processing.Messager;
import javax.annotation.processing.ProcessingEnvironment;
import javax.annotation.processing.RoundEnvironment;
import javax.annotation.processing.SupportedAnnotationTypes;
import javax.annotation.processing.SupportedSourceVersion;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.Element;
import javax.lang.model.element.ElementKind;
import javax.lang.model.element.Modifier;
import javax.lang.model.element.TypeElement;
import javax.lang.model.element.VariableElement;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.util.ElementFilter;
import javax.lang.model.util.Elements;
import javax.tools.Diagnostic;
import javax.tools.JavaFileObject;
@SupportedAnnotationTypes("me.snowleo.yaml.YamlClass")
@SupportedSourceVersion(SourceVersion.RELEASE_6)
public class YamlPropertyProcessor extends AbstractProcessor
{
private transient Filer filer;
private transient Messager messager;
private Elements eltUtils;
public YamlPropertyProcessor()
{
super();
}
@Override
public void init(final ProcessingEnvironment processingEnv)
{
super.init(processingEnv);
filer = processingEnv.getFiler();
messager = processingEnv.getMessager();
eltUtils = processingEnv.getElementUtils();
}
@Override
public boolean process(final Set<? extends TypeElement> set, final RoundEnvironment roundEnv)
{
for (Element elem : roundEnv.getElementsAnnotatedWith(YamlClass.class))
{
if (elem.getKind() != ElementKind.CLASS)
{
messager.printMessage(Diagnostic.Kind.ERROR, "YamlClass has to be a class", elem);
continue;
}
final TypeElement clazz = (TypeElement)elem;
String superClassName = clazz.getSuperclass().toString();
if (!superClassName.startsWith(clazz.getEnclosingElement().toString()))
{
superClassName = clazz.getEnclosingElement().toString() + "." + superClassName;
}
if (!superClassName.equalsIgnoreCase(clazz.getQualifiedName().toString() + "Yaml"))
{
messager.printMessage(Diagnostic.Kind.ERROR, "YamlClass must be extended by " + clazz.getQualifiedName().toString() + "Yaml", elem);
continue;
}
final List<VariableElement> fields = new ArrayList<VariableElement>();
for (VariableElement field : ElementFilter.fieldsIn(clazz.getEnclosedElements()))
{
if (!(field.getModifiers().contains(Modifier.STATIC))
&& field.getModifiers().contains(Modifier.PROTECTED))
{
fields.add(field);
}
else if (field.getAnnotation(YamlComment.class) != null)
{
messager.printMessage(Diagnostic.Kind.ERROR, "YamlComment fields have to be nonstatic and protected.", field);
continue;
}
}
if (fields.isEmpty())
{
messager.printMessage(Diagnostic.Kind.ERROR, "YamlClass needs at least one protected field.", clazz);
continue;
}
createImplclass(clazz, fields);
createSuperclass(clazz, fields);
}
return true;
}
private void createSuperclass(final TypeElement clazz, final List<VariableElement> fields)
{
try
{
final JavaFileObject file = filer.createSourceFile(clazz.getQualifiedName() + "Yaml");
messager.printMessage(Diagnostic.Kind.NOTE, "Creating " + file.toUri());
final Writer writer = file.openWriter();
//Add the content to the newly generated file.
final PrintWriter pwriter = new PrintWriter(writer);
try
{
pwriter.print("package ");
pwriter.print(clazz.getEnclosingElement());
pwriter.println(';');
pwriter.println();
pwriter.print("public class ");
pwriter.print(clazz.getSimpleName());
pwriter.print("Yaml extends BaseYaml<");
pwriter.print(clazz.getSimpleName());
pwriter.println("> {");
pwriter.println(" @Override");
pwriter.print(" protected Class<");
pwriter.print(clazz.getSimpleName());
pwriter.print("YamlImpl> getClazz() { return ");
pwriter.print(clazz.getSimpleName());
pwriter.println("YamlImpl.class; };");
for (VariableElement var : fields)
{
final TypeMirror type = var.asType();
final String name = capitalize(var.getSimpleName().toString());
pwriter.print(" public ");
pwriter.print(type.toString());
if (type.toString().equalsIgnoreCase("boolean"))
{
pwriter.print(" is");
}
else
{
pwriter.print(" get");
}
pwriter.print(name);
pwriter.println("() { throw new AssertionError(\"Cannot be called.\"); }");
pwriter.print(" public void set");
pwriter.print(name);
pwriter.print("(final ");
pwriter.print(type.toString());
pwriter.print(' ');
pwriter.print(name);
pwriter.println(") { throw new AssertionError(\"Cannot be called.\"); }");
}
pwriter.println("}");
pwriter.flush();
}
finally
{
pwriter.close();
}
}
catch (IOException ex)
{
messager.printMessage(Diagnostic.Kind.ERROR, ex.toString());
}
}
private void createImplclass(final TypeElement clazz, final List<VariableElement> fields)
{
try
{
final JavaFileObject file = filer.createSourceFile(clazz.getQualifiedName() + "YamlImpl");
messager.printMessage(Diagnostic.Kind.NOTE, "Creating " + file.toUri());
final Writer writer = file.openWriter();
//Add the content to the newly generated file.
final PrintWriter pwriter = new PrintWriter(writer);
try
{
pwriter.print("package ");
pwriter.print(clazz.getEnclosingElement());
pwriter.println(';');
pwriter.println();
pwriter.print("public class ");
pwriter.print(clazz.getSimpleName());
pwriter.print("YamlImpl extends ");
pwriter.print(clazz.getSimpleName());
pwriter.println(" {");
for (VariableElement var : fields)
{
final TypeMirror type = var.asType();
final String name = capitalize(var.getSimpleName().toString());
pwriter.print(" public ");
pwriter.print(type.toString());
if (type.toString().equalsIgnoreCase("boolean"))
{
pwriter.print(" is");
}
else
{
pwriter.print(" get");
}
pwriter.print(name);
pwriter.print("() { return this.");
pwriter.print(var.getSimpleName().toString());
pwriter.println("; }");
pwriter.print(" public void set");
pwriter.print(name);
pwriter.print("(final ");
pwriter.print(type.toString());
pwriter.print(' ');
pwriter.print(name);
pwriter.print(") { this.");
pwriter.print(var.getSimpleName().toString());
pwriter.print(" = ");
pwriter.print(name);
pwriter.println("; }");
}
pwriter.println("}");
pwriter.flush();
}
finally
{
pwriter.close();
}
}
catch (IOException ex)
{
messager.printMessage(Diagnostic.Kind.ERROR, ex.toString());
}
}
private static String capitalize(String name)
{
char[] c = name.toCharArray();
c[0] = Character.toUpperCase(c[0]);
return new String(c);
}
}
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