com.sun.faces.application.annotation.PersistenceContextScanner Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of jakarta.faces Show documentation
EE4J Compatible Implementation for Jakarta Faces API
The newest version!
/*
 * Copyright (c) 1997, 2020 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package com.sun.faces.application.annotation;

import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;

import com.sun.faces.util.Util;

import jakarta.persistence.PersistenceContext;

/**
 * Scanner implementation responsible for {@link PersistenceContext} annotations.
 */
class PersistenceContextScanner implements Scanner {

    /**
     * Get the annotation we handle.
     *
     * @return the annotation we handle.
     */
    @Override
    public Class getAnnotation() {
        return PersistenceContext.class;
    }

    /**
     * Scan the specified class for the given annotation.
     *
     * @param clazz the class.
     * @return the runtime annotation handler.
     * @todo Make sure we get all the fields, handle method and class based injection, handle PersistenceContexts.
     */
    @Override
    public RuntimeAnnotationHandler scan(Class clazz) {
        Util.notNull("clazz", clazz);
        PersistenceContextHandler handler = null;

        ArrayList fieldAnnotations = new ArrayList<>();
        ArrayList fields = new ArrayList<>();

        for (Field field : clazz.getDeclaredFields()) {
            PersistenceContext fieldAnnotation = field.getAnnotation(PersistenceContext.class);
            if (fieldAnnotation != null) {
                fieldAnnotations.add(fieldAnnotation);
                fields.add(field);
            }
        }

        ArrayList methodAnnotations = new ArrayList<>();
        ArrayList methods = new ArrayList<>();
        for (Method method : clazz.getDeclaredMethods()) {
            PersistenceContext methodAnnotation = method.getAnnotation(PersistenceContext.class);
            if (methodAnnotation != null) {
                methodAnnotations.add(methodAnnotation);
                methods.add(method);
            }
        }

        if (!fieldAnnotations.isEmpty() || !methodAnnotations.isEmpty()) {
            handler = new PersistenceContextHandler(methods.toArray(new Method[0]), methodAnnotations.toArray(new PersistenceContext[0]),
                    fields.toArray(new Field[0]), fieldAnnotations.toArray(new PersistenceContext[0]));
        }
        return handler;
    }
}