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/*
 * Copyright 2002-2017 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
 *
 *      https://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.instrument.classloading;

import java.lang.instrument.ClassFileTransformer;

import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;

/**
 * {@code LoadTimeWeaver} that builds and exposes a
 * {@link SimpleInstrumentableClassLoader}.
 *
 * 

Mainly intended for testing environments, where it is sufficient to * perform all class transformation on a newly created * {@code ClassLoader} instance. * * @author Rod Johnson * @author Juergen Hoeller * @since 2.0 * @see #getInstrumentableClassLoader() * @see SimpleInstrumentableClassLoader * @see ReflectiveLoadTimeWeaver */ public class SimpleLoadTimeWeaver implements LoadTimeWeaver { private final SimpleInstrumentableClassLoader classLoader; /** * Create a new {@code SimpleLoadTimeWeaver} for the current context * {@code ClassLoader}. * @see SimpleInstrumentableClassLoader */ public SimpleLoadTimeWeaver() { this.classLoader = new SimpleInstrumentableClassLoader(ClassUtils.getDefaultClassLoader()); } /** * Create a new {@code SimpleLoadTimeWeaver} for the given * {@code ClassLoader}. * @param classLoader the {@code ClassLoader} to build a simple * instrumentable {@code ClassLoader} on top of */ public SimpleLoadTimeWeaver(SimpleInstrumentableClassLoader classLoader) { Assert.notNull(classLoader, "ClassLoader must not be null"); this.classLoader = classLoader; } @Override public void addTransformer(ClassFileTransformer transformer) { this.classLoader.addTransformer(transformer); } @Override public ClassLoader getInstrumentableClassLoader() { return this.classLoader; } /** * This implementation builds a {@link SimpleThrowawayClassLoader}. */ @Override public ClassLoader getThrowawayClassLoader() { return new SimpleThrowawayClassLoader(getInstrumentableClassLoader()); } }





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