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Spring Framework example source code file (DecoratingClassLoader.java)

This example Spring Framework source code file (DecoratingClassLoader.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Spring Framework tags/keywords

class, classloader, decoratingclassloader, decoratingclassloader, hashset, hashset, iterator, object, object, package, set, string, string, util

The Spring Framework DecoratingClassLoader.java source code

/*
 * Copyright 2002-2008 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.core;

import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

import org.springframework.util.Assert;

/**
 * Base class for decorating ClassLoaders such as {@link OverridingClassLoader}
 * and {@link org.springframework.instrument.classloading.ShadowingClassLoader},
 * providing common handling of excluded packages and classes.
 *
 * @author Juergen Hoeller
 * @author Rod Johnson
 * @since 2.5.2
 */
public abstract class DecoratingClassLoader extends ClassLoader {

	private final Set excludedPackages = new HashSet();

	private final Set excludedClasses = new HashSet();

	private final Object exclusionMonitor = new Object();


	/**
	 * Create a new DecoratingClassLoader with no parent ClassLoader.
	 */
	public DecoratingClassLoader() {
	}

	/**
	 * Create a new DecoratingClassLoader using the given parent ClassLoader
	 * for delegation.
	 */
	public DecoratingClassLoader(ClassLoader parent) {
		super(parent);
	}


	/**
	 * Add a package name to exclude from decoration (e.g. overriding).
	 * <p>Any class whose fully-qualified name starts with the name registered
	 * here will be handled by the parent ClassLoader in the usual fashion.
	 * @param packageName the package name to exclude
	 */
	public void excludePackage(String packageName) {
		Assert.notNull(packageName, "Package name must not be null");
		synchronized (this.exclusionMonitor) {
			this.excludedPackages.add(packageName);
		}
	}

	/**
	 * Add a class name to exclude from decoration (e.g. overriding).
	 * <p>Any class name registered here will be handled by the parent
	 * ClassLoader in the usual fashion.
	 * @param className the class name to exclude
	 */
	public void excludeClass(String className) {
		Assert.notNull(className, "Class name must not be null");
		synchronized (this.exclusionMonitor) {
			this.excludedClasses.add(className);
		}
	}

	/**
	 * Determine whether the specified class is excluded from decoration
	 * by this class loader.
	 * <p>The default implementation checks against excluded packages and classes.
	 * @param className the class name to check
	 * @return whether the specified class is eligible
	 * @see #excludePackage
	 * @see #excludeClass
	 */
	protected boolean isExcluded(String className) {
		synchronized (this.exclusionMonitor) {
			if (this.excludedClasses.contains(className)) {
				return true;
			}
			for (Iterator it = this.excludedPackages.iterator(); it.hasNext();) {
				String packageName = (String) it.next();
				if (className.startsWith(packageName)) {
					return true;
				}
			}
		}
		return false;
	}

}

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