/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
package org.apache.qpid.server.model;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.annotation.processing.AbstractProcessor;
import javax.annotation.processing.RoundEnvironment;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.AnnotationValue;
import javax.lang.model.element.Element;
import javax.lang.model.element.ElementKind;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.PackageElement;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.util.Elements;
import javax.tools.Diagnostic;
import javax.tools.JavaFileObject;
import org.apache.qpid.server.License;
public class ConfiguredObjectRegistrationGenerator extends AbstractProcessor
{
public static final String MANAGED_OBJECT_CANONICAL_NAME = "org.apache.qpid.server.model.ManagedObject";
private Map<String, Set<String>> _managedObjectClasses = new HashMap<>();
private Map<String, String> _typeMap = new HashMap<>();
private Map<String, String> _categoryMap = new HashMap<>();
@Override
public SourceVersion getSupportedSourceVersion()
{
return SourceVersion.latest();
}
@Override
public Set<String> getSupportedAnnotationTypes()
{
return Collections.singleton(MANAGED_OBJECT_CANONICAL_NAME);
}
@Override
public boolean process(final Set<? extends TypeElement> annotations, final RoundEnvironment roundEnv)
{
Elements elementUtils = processingEnv.getElementUtils();
TypeElement annotationElement = elementUtils.getTypeElement(MANAGED_OBJECT_CANONICAL_NAME);
try
{
for (Element e : roundEnv.getElementsAnnotatedWith(annotationElement))
{
if (e.getKind().equals(ElementKind.INTERFACE) || e.getKind().equals(ElementKind.CLASS))
{
PackageElement packageElement = elementUtils.getPackageOf(e);
String packageName = packageElement.getQualifiedName().toString();
String className = e.getSimpleName().toString();
AnnotationMirror annotation = getAnnotation(e, annotationElement);
AnnotationValue registerValue = getAnnotationValue(annotation, "register");
if(registerValue == null || (Boolean) registerValue.getValue() )
{
AnnotationValue typeValue = getAnnotationValue(annotation, "type");
if (typeValue != null)
{
_typeMap.put(packageName + "." + className, (String) typeValue.getValue());
processingEnv.getMessager()
.printMessage(Diagnostic.Kind.NOTE,
"looking for " + packageName + "." + className);
_categoryMap.put(packageName + "." + className, getCategory((TypeElement) e));
}
Set<String> classNames = _managedObjectClasses.get(packageName);
if (classNames == null)
{
classNames = new HashSet<>();
_managedObjectClasses.put(packageName, classNames);
}
classNames.add(className);
}
}
}
for (Map.Entry<String, Set<String>> entry : _managedObjectClasses.entrySet())
{
generateRegistrationFile(entry.getKey(), entry.getValue());
}
_managedObjectClasses.clear();
_typeMap.clear();
_categoryMap.clear();
}
catch (Exception e)
{
processingEnv.getMessager().printMessage(Diagnostic.Kind.ERROR, "Error: " + e.getLocalizedMessage());
}
return false;
}
private AnnotationValue getAnnotationValue(final AnnotationMirror annotation, final String attribute)
{
for(Map.Entry<? extends ExecutableElement, ? extends AnnotationValue> entry : annotation.getElementValues().entrySet())
{
if(entry.getKey().getSimpleName().toString().equals(attribute))
{
return entry.getValue();
}
}
return null;
}
private AnnotationMirror getAnnotation(final Element e, final TypeElement annotationElement)
{
for(AnnotationMirror a : e.getAnnotationMirrors())
{
if (a.getAnnotationType().asElement().equals(annotationElement))
{
return a;
}
}
return null;
}
private String getCategory(final TypeElement e)
{
Elements elementUtils = processingEnv.getElementUtils();
TypeElement annotationElement = elementUtils.getTypeElement(MANAGED_OBJECT_CANONICAL_NAME);
String category = null;
List<? extends AnnotationMirror> annotationMirrors = e.getAnnotationMirrors();
if(annotationMirrors != null)
{
for (AnnotationMirror a : annotationMirrors)
{
if (a.getAnnotationType().asElement().equals(annotationElement))
{
category = e.getSimpleName().toString().toLowerCase();
for (Map.Entry<? extends ExecutableElement, ? extends AnnotationValue> entry : a.getElementValues()
.entrySet())
{
if (entry.getKey().getSimpleName().toString().equals("category"))
{
if (!Boolean.TRUE.equals(entry.getValue().getValue()))
{
category = null;
}
break;
}
}
break;
}
}
}
if (category == null)
{
for (TypeMirror interfaceMirror : e.getInterfaces())
{
category = getCategory((TypeElement) processingEnv.getTypeUtils().asElement(interfaceMirror));
if (category != null)
{
break;
}
}
}
if (category == null && e.getSuperclass() != null)
{
TypeElement parent = (TypeElement) processingEnv.getTypeUtils().asElement(e.getSuperclass());
if(parent != null)
{
category = getCategory(parent);
}
}
return category;
}
private void generateRegistrationFile(final String packageName, final Set<String> classNames)
{
final String className = "ConfiguredObjectRegistrationImpl";
final String qualifiedClassName = packageName + "." + className;
try
{
JavaFileObject factoryFile = processingEnv.getFiler().createSourceFile(qualifiedClassName);
PrintWriter pw = new PrintWriter(new OutputStreamWriter(factoryFile.openOutputStream(), "UTF-8"));
pw.println("/*");
for (String headerLine : License.LICENSE)
{
pw.println(" *" + headerLine);
}
pw.println(" */");
pw.println();
pw.print("package ");
pw.print(packageName);
pw.println(";");
pw.println();
pw.println("import java.util.Collections;");
pw.println("import java.util.HashSet;");
pw.println("import java.util.Set;");
pw.println();
pw.println("import org.apache.qpid.server.model.ConfiguredObject;");
pw.println("import org.apache.qpid.server.plugin.ConfiguredObjectRegistration;");
pw.println("import org.apache.qpid.server.plugin.PluggableService;");
pw.println();
pw.println("@PluggableService");
pw.println("public class " + className + " implements ConfiguredObjectRegistration");
pw.println("{");
pw.println(" private final Set<Class<? extends ConfiguredObject>> _implementations;");
pw.println();
pw.println(" public " + className + "()");
pw.println(" {");
pw.println(" Set<Class<? extends ConfiguredObject>> implementations = new HashSet<>();");
for(String implementationName : classNames)
{
String qualifiedImplementationName = packageName + "." + implementationName;
if(_typeMap.get(qualifiedImplementationName) != null && _categoryMap.get(qualifiedImplementationName) != null)
{
pw.println(" if(!Boolean.getBoolean(\"qpid.type.disabled:"
+_categoryMap.get(qualifiedImplementationName)
+"."+_typeMap.get(qualifiedImplementationName)+"\"))");
pw.println(" {");
pw.println(" implementations.add("+implementationName+".class);");
pw.println(" }");
}
else
{
pw.println(" implementations.add(" + implementationName + ".class);");
}
}
pw.println(" _implementations = Collections.unmodifiableSet(implementations);");
pw.println(" }");
pw.println();
pw.println(" public String getType()");
pw.println(" {");
pw.println(" return \""+packageName+"\";");
pw.println(" }");
pw.println();
pw.println(" public Set<Class<? extends ConfiguredObject>> getConfiguredObjectClasses()");
pw.println(" {");
pw.println(" return _implementations;");
pw.println(" }");
pw.println();
pw.println("}");
pw.close();
}
catch (IOException e)
{
processingEnv.getMessager().printMessage(Diagnostic.Kind.ERROR,
"Failed to write file: "
+ qualifiedClassName
+ " - "
+ e.getLocalizedMessage()
);
}
}
}