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The PDO application layer of the Tentackle Framework
There is a newer version: 21.16.2.0
/*
 * Tentackle - https://tentackle.org
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package org.tentackle.apt.pdo;

import org.tentackle.apt.AbstractServiceAnnotationProcessor;
import org.tentackle.apt.visitor.ClassArgConstructorVisitor;
import org.tentackle.common.AnnotationProcessor;
import org.tentackle.pdo.DomainContext;
import org.tentackle.pdo.Operation;
import org.tentackle.session.Session;

import javax.annotation.processing.SupportedAnnotationTypes;
import javax.lang.model.element.Element;
import javax.lang.model.type.ExecutableType;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.type.TypeVisitor;
import javax.lang.model.util.SimpleTypeVisitor8;
import javax.tools.Diagnostic;
import java.util.List;

/**
 * Annotation processor for the {@code @PersistentOperationService} annotation.

 * Enforces the implementation of the following constructors:
 *
 * 
 *   ({@link Operation}, {@link DomainContext})
 *   ({@link Operation}, {@link Session})
 *   ({@link Operation})
 *   ()
 * 
 *
 * @author harald
 */
@SupportedAnnotationTypes("org.tentackle.pdo.PersistentOperationService")
@AnnotationProcessor
public class PersistentOperationServiceAnnotationProcessor extends AbstractServiceAnnotationProcessor {

  private final ClassArgConstructorVisitor classArgVisitor = new ClassArgConstructorVisitor(this, Operation.class);

  /**
   * Creates the processor.
   */
  public PersistentOperationServiceAnnotationProcessor() {
    // see -Xlint:missing-explicit-ctor since Java 16
  }


  @Override
  protected void processClass(Element element) {
    super.processClass(element);
    if (!verifyConstructor(element, noArgsVisitor)) {
      processingEnv.getMessager().printMessage(
          Diagnostic.Kind.ERROR,
          element + " needs a no-args constructor", element);
    }
    if (!verifyConstructor(element, classArgVisitor)) {
      processingEnv.getMessager().printMessage(
          Diagnostic.Kind.ERROR,
          element + " needs constructor (Operation)", element);
    }
    if (!verifyConstructor(element, opContextVisitor)) {
      processingEnv.getMessager().printMessage(
          Diagnostic.Kind.ERROR,
          element + " needs constructor (Operation, DomainContext)", element);
    }
    if (!verifyConstructor(element, opSessionVisitor)) {
      processingEnv.getMessager().printMessage(
          Diagnostic.Kind.ERROR,
          element + " needs constructor (Operation, Session)", element);
    }
    verifyImplements(element, "org.tentackle.pdo.PersistentOperation");
  }



  private final TypeVisitor opContextVisitor = new SimpleTypeVisitor8<>() {
    @Override
    public Boolean visitExecutable(ExecutableType t, Void v) {
      List typeList = t.getParameterTypes();
      return typeList.size() == 2 &&
              acceptTypeVisitor(typeList.get(0), Operation.class) &&
              acceptTypeVisitor(typeList.get(1), DomainContext.class);
    }
  };

  private final TypeVisitor opSessionVisitor = new SimpleTypeVisitor8<>() {
    @Override
    public Boolean visitExecutable(ExecutableType t, Void v) {
      List typeList = t.getParameterTypes();
      return typeList.size() == 2 &&
              acceptTypeVisitor(typeList.get(0), Operation.class) &&
              acceptTypeVisitor(typeList.get(1), Session.class);
    }
  };
}