org.apidesign.html.geo.impl.GeoProcessor Maven / Gradle / Ivy
/**
* HTML via Java(tm) Language Bindings
* Copyright (C) 2013 Jaroslav Tulach
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details. apidesign.org
* designates this particular file as subject to the
* "Classpath" exception as provided by apidesign.org
* in the License file that accompanied this code.
*
* You should have received a copy of the GNU General Public License
* along with this program. Look for COPYING file in the top folder.
* If not, see http://wiki.apidesign.org/wiki/GPLwithClassPathException
*/
package org.apidesign.html.geo.impl;
import java.io.IOException;
import java.io.Writer;
import java.util.List;
import java.util.Locale;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.processing.AbstractProcessor;
import javax.annotation.processing.Processor;
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.ExecutableElement;
import javax.lang.model.element.Modifier;
import javax.lang.model.element.PackageElement;
import javax.lang.model.element.TypeElement;
import javax.lang.model.element.VariableElement;
import javax.lang.model.type.TypeMirror;
import javax.tools.Diagnostic;
import javax.tools.JavaFileObject;
import net.java.html.geo.OnLocation;
import net.java.html.geo.Position;
import org.openide.util.lookup.ServiceProvider;
/** Annotation processor to generate callbacks from {@link GeoHandle} class.
*
* @author Jaroslav Tulach
*/
@ServiceProvider(service=Processor.class)
@SupportedSourceVersion(SourceVersion.RELEASE_6)
@SupportedAnnotationTypes({
"net.java.html.geo.OnLocation"
})
public final class GeoProcessor extends AbstractProcessor {
private static final Logger LOG = Logger.getLogger(GeoProcessor.class.getName());
@Override
public boolean process(Set annotations, RoundEnvironment roundEnv) {
boolean ok = true;
for (Element e : roundEnv.getElementsAnnotatedWith(OnLocation.class)) {
if (!processLocation(e)) {
ok = false;
}
}
return ok;
}
private void error(String msg, Element e) {
processingEnv.getMessager().printMessage(Diagnostic.Kind.ERROR, msg, e);
}
private boolean processLocation(Element e) {
if (e.getKind() != ElementKind.METHOD) {
return false;
}
ExecutableElement me = (ExecutableElement) e;
OnLocation ol = e.getAnnotation(OnLocation.class);
if (ol == null) {
return true;
}
if (me.getModifiers().contains(Modifier.PRIVATE)) {
error("Method annotated by @OnLocation cannot be private", e);
return false;
}
TypeMirror positionClass = processingEnv.getElementUtils().getTypeElement(Position.class.getName()).asType();
final List params = me.getParameters();
if (params.size() < 1 || !params.get(0).asType().equals(positionClass)) {
error("Method annotated by @OnLocation first argument must be net.java.html.geo.Position!", e);
return false;
}
String className = ol.className();
if (className.isEmpty()) {
String n = e.getSimpleName().toString();
if (n.isEmpty()) {
error("Empty method name", e);
return false;
}
final String firstLetter = n.substring(0, 1).toUpperCase(Locale.ENGLISH);
className = firstLetter + n.substring(1) + "Handle";
}
TypeElement te = (TypeElement)e.getEnclosingElement();
PackageElement pe = (PackageElement) te.getEnclosingElement();
final String pkg = pe.getQualifiedName().toString();
final String fqn = pkg + "." + className;
final boolean isStatic = me.getModifiers().contains(Modifier.STATIC);
String sep;
try {
JavaFileObject fo = processingEnv.getFiler().createSourceFile(fqn, e);
Writer w = fo.openWriter();
w.append("package ").append(pkg).append(";\n");
w.append("class ").append(className).append(" extends net.java.html.geo.Position.Handle {\n");
if (!isStatic) {
w.append(" private final ").append(te.getSimpleName()).append(" $i;\n");
}
for (int i = 1; i < params.size(); i++) {
final VariableElement p = params.get(i);
w.append(" private final ").append(p.asType().toString()).append(" ").append(p.getSimpleName()).append(";\n");
}
w.append(" private ").append(className).append("(boolean oneTime");
w.append(", ").append(te.getSimpleName()).append(" i");
for (int i = 1; i < params.size(); i++) {
final VariableElement p = params.get(i);
w.append(", ").append(p.asType().toString()).append(" ").append(p.getSimpleName());
}
w.append(") {\n super(oneTime);\n");
if (!isStatic) {
w.append(" this.$i = i;\n");
}
for (int i = 1; i < params.size(); i++) {
final VariableElement p = params.get(i);
w.append(" this.").append(p.getSimpleName()).append(" = ").append(p.getSimpleName()).append(";\n");
}
w.append("}\n");
w.append(" static net.java.html.geo.Position.Handle createQuery(");
String inst;
if (!isStatic) {
w.append(te.getSimpleName()).append(" instance");
inst = "instance";
sep = ", ";
} else {
inst = "null";
sep = "";
}
for (int i = 1; i < params.size(); i++) {
final VariableElement p = params.get(i);
w.append(sep).append(p.asType().toString()).append(" ").append(p.getSimpleName());
sep = ", ";
}
w.append(") { return new ").append(className).append("(true, ").append(inst);
for (int i = 1; i < params.size(); i++) {
final VariableElement p = params.get(i);
w.append(", ").append(p.getSimpleName());
}
w.append("); }\n");
w.append(" static net.java.html.geo.Position.Handle createWatch(");
if (!isStatic) {
w.append(te.getSimpleName()).append(" instance");
sep = ", ";
} else {
sep = "";
}
for (int i = 1; i < params.size(); i++) {
final VariableElement p = params.get(i);
w.append(sep).append(p.asType().toString()).append(" ").append(p.getSimpleName());
}
w.append(") { return new ").append(className).append("(false, ").append(inst);
for (int i = 1; i < params.size(); i++) {
final VariableElement p = params.get(i);
w.append(", ").append(p.getSimpleName());
}
w.append("); }\n");
w.append(" @Override protected void onError(Exception t) throws Throwable {\n");
if (ol.onError().isEmpty()) {
w.append(" t.printStackTrace();");
} else {
if (!findOnError(me, te, ol.onError(), isStatic)) {
return false;
}
if (isStatic) {
w.append(" ").append(te.getSimpleName()).append(".");
} else {
w.append(" $i.");
}
w.append(ol.onError()).append("(t");
for (int i = 1; i < params.size(); i++) {
final VariableElement p = params.get(i);
w.append(", ").append(p.getSimpleName());
}
w.append(");\n");
}
w.append(" }\n");
w.append(" @Override protected void onLocation(net.java.html.geo.Position p) throws Throwable {\n");
if (isStatic) {
w.append(" ").append(te.getSimpleName()).append(".");
} else {
w.append(" $i.");
}
w.append(me.getSimpleName()).append("(p");
for (int i = 1; i < params.size(); i++) {
final VariableElement p = params.get(i);
w.append(", ").append(p.getSimpleName());
}
w.append(");\n");
w.append(" }\n");
w.append("}\n");
w.close();
} catch (IOException ex) {
Logger.getLogger(GeoProcessor.class.getName()).log(Level.SEVERE, null, ex);
error("Can't write handler class: " + ex.getMessage(), e);
return false;
}
return true;
}
private boolean findOnError(ExecutableElement errElem, TypeElement te, String name, boolean onlyStatic) {
String err = null;
METHODS: for (Element e : te.getEnclosedElements()) {
if (e.getKind() != ElementKind.METHOD) {
continue;
}
if (!e.getSimpleName().contentEquals(name)) {
continue;
}
if (onlyStatic && !e.getModifiers().contains(Modifier.STATIC)) {
errElem = (ExecutableElement) e;
err = "Would have to be static";
continue;
}
ExecutableElement ee = (ExecutableElement) e;
TypeMirror excType = processingEnv.getElementUtils().getTypeElement(Exception.class.getName()).asType();
final List params = ee.getParameters();
if (params.size() < 1 ||
!processingEnv.getTypeUtils().isAssignable(excType, ee.getParameters().get(0).asType())
) {
errElem = (ExecutableElement) e;
err = "Error method first argument needs to be Exception";
continue;
}
final List origParams = errElem.getParameters();
if (params.size() != origParams.size()) {
errElem = (ExecutableElement) e;
err = "Error method must have the same parameters as @OnLocation one";
continue;
}
for (int i = 1; i < origParams.size(); i++) {
final TypeMirror t1 = params.get(i).asType();
final TypeMirror t2 = origParams.get(i).asType();
if (!processingEnv.getTypeUtils().isSameType(t1, t2)) {
errElem = (ExecutableElement) e;
err = "Error method must have the same parameters as @OnLocation one";
continue METHODS;
}
}
return true;
}
if (err == null) {
err = "Cannot find " + name + "(Exception) method in this class";
}
error(err, errElem);
return false;
}
}
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