001    /*
002     * JBoss DNA (http://www.jboss.org/dna)
003     * See the COPYRIGHT.txt file distributed with this work for information
004     * regarding copyright ownership.  Some portions may be licensed
005     * to Red Hat, Inc. under one or more contributor license agreements.
006     * See the AUTHORS.txt file in the distribution for a full listing of 
007     * individual contributors. 
008     *
009     * JBoss DNA is free software. Unless otherwise indicated, all code in JBoss DNA
010     * is licensed to you under the terms of the GNU Lesser General Public License as
011     * published by the Free Software Foundation; either version 2.1 of
012     * the License, or (at your option) any later version.
013     *
014     * JBoss DNA is distributed in the hope that it will be useful,
015     * but WITHOUT ANY WARRANTY; without even the implied warranty of
016     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
017     * Lesser General Public License for more details.
018     *
019     * You should have received a copy of the GNU Lesser General Public
020     * License along with this software; if not, write to the Free
021     * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
022     * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
023     */
024    package org.jboss.dna.common.component;
025    
026    import net.jcip.annotations.Immutable;
027    
028    /**
029     * @author Randall Hauch
030     */
031    @Immutable
032    public class StandardClassLoaderFactory implements ClassLoaderFactory {
033    
034        private final ClassLoader delegate;
035        private final boolean useCurrentThreadContextClassLoader;
036    
037        public StandardClassLoaderFactory() {
038            this(true, null);
039        }
040    
041        public StandardClassLoaderFactory( final ClassLoader delegate ) {
042            this(true, delegate);
043        }
044    
045        public StandardClassLoaderFactory( boolean useCurrentThreadContextClassLoader, final ClassLoader delegate ) {
046            this.delegate = delegate != null ? delegate : this.getClass().getClassLoader();
047            this.useCurrentThreadContextClassLoader = useCurrentThreadContextClassLoader;
048        }
049    
050        /**
051         * {@inheritDoc}
052         */
053        public ClassLoader getClassLoader( String... classpath ) {
054            ClassLoader result = null;
055            if (this.useCurrentThreadContextClassLoader) result = Thread.currentThread().getContextClassLoader();
056            if (result == null) result = this.delegate;
057            return result;
058        }
059    }