001    /*
002     * JBoss, Home of Professional Open Source.
003     * Copyright 2008, Red Hat Middleware LLC, and individual contributors
004     * as indicated by the @author tags. See the copyright.txt file in the
005     * distribution for a full listing of individual contributors. 
006     *
007     * This is free software; you can redistribute it and/or modify it
008     * under the terms of the GNU Lesser General Public License as
009     * published by the Free Software Foundation; either version 2.1 of
010     * the License, or (at your option) any later version.
011     *
012     * This software is distributed in the hope that it will be useful,
013     * but WITHOUT ANY WARRANTY; without even the implied warranty of
014     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015     * Lesser General Public License for more details.
016     *
017     * You should have received a copy of the GNU Lesser General Public
018     * License along with this software; if not, write to the Free
019     * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020     * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
021     */
022    package org.jboss.dna.common.component;
023    
024    import net.jcip.annotations.Immutable;
025    
026    /**
027     * @author Randall Hauch
028     */
029    @Immutable
030    public class StandardClassLoaderFactory implements ClassLoaderFactory {
031    
032        private final ClassLoader delegate;
033        private final boolean useCurrentThreadContextClassLoader;
034    
035        public StandardClassLoaderFactory() {
036            this(true, null);
037        }
038    
039        public StandardClassLoaderFactory( final ClassLoader delegate ) {
040            this(true, delegate);
041        }
042    
043        public StandardClassLoaderFactory( boolean useCurrentThreadContextClassLoader, final ClassLoader delegate ) {
044            this.delegate = delegate != null ? delegate : this.getClass().getClassLoader();
045            this.useCurrentThreadContextClassLoader = useCurrentThreadContextClassLoader;
046        }
047    
048        /**
049         * {@inheritDoc}
050         */
051        public ClassLoader getClassLoader( String... classpath ) {
052            ClassLoader result = null;
053            if (this.useCurrentThreadContextClassLoader) result = Thread.currentThread().getContextClassLoader();
054            if (result == null) result = this.delegate;
055            return result;
056        }
057    }