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/*
 * Copyright (c) 1998, 2021 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,
 * or the Eclipse Distribution License v. 1.0 which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
 */

// Contributors:
//     Oracle - initial API and implementation from Oracle TopLink
package org.eclipse.persistence.jaxb.compiler;

import java.lang.reflect.Method;

import javax.xml.bind.Unmarshaller;

import org.eclipse.persistence.internal.security.PrivilegedAccessHelper;

/**
 * INTERNAL:
 *  Purpose:Hold information about class based JAXB 2.0 Callback methods
 *  
Responsibilities:

 *  Store information about domainClass and the callback methods
 *  Act as a means to integrate JAXB 2.0 Class based callbacks with TopLink OXM
 *  Listener based callbacks.
 *
 *  A Map of UnmarshalCallbacks are created during JAXB 2.0 Generation and are set on a
 *  JAXBUnmarshallerListener on each JAXBUnmarshaller. These callbacks are used to invoke
 *  the JAXB 2.0 Class Based callbacks on each object at the appropriate time.
 *
 *  @author mmacivor
 *  @since Oracle TopLink 11.1.1.0.0
 *  @see org.eclipse.persistence.jaxb.JAXBUnmarshalListener
 *  @see org.eclipse.persistence.jaxb.JAXBUnmarshaller
 */
public class UnmarshalCallback {
    private Class domainClass;
    private String domainClassName;
    private Method afterUnmarshalCallback;
    private Method beforeUnmarshalCallback;
    private boolean hasAfterUnmarshalCallback = false;
    private boolean hasBeforeUnmarshalCallback = false;

    public Method getAfterUnmarshalCallback() {
        return afterUnmarshalCallback;
    }

    public Method getBeforeUnmarshalCallback() {
        return beforeUnmarshalCallback;
    }

    public Class getDomainClass() {
        return domainClass;
    }

    /**
     * Initialize information about class based JAXB 2.0 Callback methods.
     *
     * @param loader source class loader for {@code domainClass}
     */
    public void initialize(ClassLoader loader) {
        try {
            domainClass = PrivilegedAccessHelper.callDoPrivilegedWithException(
                    () -> PrivilegedAccessHelper.getClassForName(domainClassName, true, loader)
            );
        } catch (ClassNotFoundException ex) {
            return;
        } catch (Exception ex) {
            throw new RuntimeException(String.format("Failed initialization of %s class", domainClassName), ex);
        }
        Class[] params = new Class[]{ Unmarshaller.class, Object.class };
        if (hasBeforeUnmarshalCallback) {
            try {
                Method beforeUnmarshal = PrivilegedAccessHelper.callDoPrivilegedWithException(
                        () -> PrivilegedAccessHelper.getMethod(domainClass, "beforeUnmarshal", params, false)
                );
                setBeforeUnmarshalCallback(beforeUnmarshal);
            } catch (NoSuchMethodException nsmex) {
                // Ignore this exception
            } catch (Exception ex) {
                throw new RuntimeException(String.format("Failed initialization of beforeMarshal method of %s class", domainClassName), ex);
            }
        }
        if (hasAfterUnmarshalCallback) {
            try {
                Method afterUnmarshal = PrivilegedAccessHelper.callDoPrivilegedWithException(
                        () -> PrivilegedAccessHelper.getMethod(domainClass, "afterUnmarshal", params, false)
                );
                setAfterUnmarshalCallback(afterUnmarshal);
            } catch (NoSuchMethodException nsmex) {
                // Ignore this exception
            } catch (Exception ex) {
                throw new RuntimeException(String.format("Failed initialization of afterMarshal method of %s class", domainClassName), ex);
            }
        }
    }

    /**
     * Should not use this method - the init method will
     * overwrite the set value.
     */
    public void setAfterUnmarshalCallback(Method method) {
        afterUnmarshalCallback = method;
    }

    public void setHasAfterUnmarshalCallback() {
        hasAfterUnmarshalCallback = true;
    }

    /**
     * Should not use this method - the init method will
     * overwrite the set value.
     */
    public void setBeforeUnmarshalCallback(Method method) {
        beforeUnmarshalCallback = method;
    }

    public void setHasBeforeUnmarshalCallback() {
        hasBeforeUnmarshalCallback = true;
    }

    /**
     * Should use setDomainClassName - the init method will overwrite
     * the set value with Class.forName(domainClassName)
     *
     * @param clazz
     */
    public void setDomainClass(Class clazz) {
        domainClass = clazz;
        setDomainClassName(clazz.getName());
    }

    public void setDomainClassName(String className) {
        domainClassName = className;
    }
}