org.eclipse.persistence.internal.jaxb.JAXBSetMethodAttributeAccessor Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of eclipselink Show documentation
EclipseLink build based upon Git transaction f2b9fc5
The newest version!
/*
 * 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:
// dmccann - May 29/2009 - 2.0 - Initial implementation
package org.eclipse.persistence.internal.jaxb;

import org.eclipse.persistence.exceptions.DescriptorException;
import org.eclipse.persistence.internal.core.helper.CoreClassConstants;
import org.eclipse.persistence.internal.descriptors.MethodAttributeAccessor;
import org.eclipse.persistence.internal.helper.Helper;

/**
 * This accessor should be used when processing a class that uses method access,
 * and a has set method but no get method.  The get method is required during
 * mapping initialization to determine the type of the set method's input
 * parameter, and an exception will occur if none is present.  Using this
 * custom method accessor, the input parameter of the set method can be
 * set (as a string) and loaded (using the provided classloader) during
 * the initialization phase.
 *
 * Two methods are overridden to avoid exceptions due to lack of a get
 * method:
 *
 *   - initializeAttributes
 *   - getAttributeClass
 *
 */
public class JAXBSetMethodAttributeAccessor extends MethodAttributeAccessor {
    String parameterTypeAsString;
    ClassLoader loader;
    Class attributeClassification = CoreClassConstants.OBJECT;

    /**
     * This constructor sets the set method input parameter type (as string) as
     * well as the classloader that will be used to load the associated class
     * during initialization.
     *
     */
    public JAXBSetMethodAttributeAccessor(String parameterTypeAsString, ClassLoader loader) {
        this.parameterTypeAsString = parameterTypeAsString;
        this.loader = loader;
    }

    /**
     * Override to avoid exceptions due to lack of get method.
     */
    @Override
    public void initializeAttributes(Class theJavaClass) throws DescriptorException {
        if (getAttributeName() == null) {
            throw DescriptorException.attributeNameNotSpecified();
        }
        try {
            if (!isWriteOnly()) {
                Class[] parameterTypes = new Class[1];
                parameterTypes[0] = Helper.getClassFromClasseName(parameterTypeAsString, loader);
                attributeClassification = parameterTypes[0];
                setSetMethod(Helper.getDeclaredMethod(theJavaClass, setMethodName, parameterTypes));
            }
        } catch (NoSuchMethodException ex) {
            DescriptorException descriptorException = DescriptorException.noSuchMethodWhileInitializingAttributesInMethodAccessor(getSetMethodName(), getGetMethodName(), theJavaClass.getName());
            descriptorException.setInternalException(ex);
            throw descriptorException;
        }
    }

    /**
     * Return the return type of the method accessor.
     */
    @Override
    public Class getAttributeClass() {
        return attributeClassification;
    }
}