/*
 * Copyright 2002-2006 the original author or authors.
 * 
 * Licensed 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.springframework.orm.jpa.vendor;

import org.springframework.instrument.classloading.SimpleInstrumentableClassLoader;
import org.springframework.instrument.classloading.SimpleLoadTimeWeaver;


/**
 * OpenJPA-specific SimpleLoadTimeWeaver which excludes all the core
 * <em>org.apache.openjpa</em> packages from being instrumented. This
 * is important, since enhanced classes will wind up implementing
 * <em>org.apache.openjpa.enhance.PersistenceCapable</em>, so it there
 * is a mismatch between the PersistenceCapable that is loaded by the
 * system classloader and the one that is loaded by the 
 * instrumenting ClassLoader, then OpenJPA will not function properly.
 *
 * <p>
 *
 * This loader can be specific by including the following in the 
 * spring configuration XML as follows:
 *
 * <p>
 *
 * <code>
 *  &lt;bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"&rt;
 *  ...
 *    &lt;property name="loadTimeWeaver"&rt;
 *        &lt;bean class="org.springframework.orm.jpa.vendor.OpenJpaLoadTimeWeaver"/&rt;
 *    &lt;/property&rt;
 *    &lt;/bean&rt;
 * </code>
 * 
 * @author Marc Prud'hommeaux
 * @since 2.0
 */
public class OpenJpaLoadTimeWeaver extends SimpleLoadTimeWeaver {

    public OpenJpaLoadTimeWeaver() {
        super();
        ((SimpleInstrumentableClassLoader) getInstrumentableClassLoader()).
            excludePackage("org.apache.openjpa");
    }

    public OpenJpaLoadTimeWeaver(SimpleInstrumentableClassLoader loader) {
        super(loader);
        ((SimpleInstrumentableClassLoader) getInstrumentableClassLoader()).
            excludePackage("org.apache.openjpa");
    }
}