org.jboss.modules.ClassifyingModuleLoader Maven / Gradle / Ivy
/*
* JBoss, Home of Professional Open Source.
* Copyright 2010, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.modules;
import java.util.HashMap;
import java.util.Map;
/**
* A module loader which selects a delegate module loader based upon the prefix of the module name. Longer
* names are matched first always.
*
* @author David M. Lloyd
*/
public final class ClassifyingModuleLoader extends ModuleLoader {
private volatile Map delegates;
private final ModuleLoader defaultLoader;
private final String name;
/**
* Construct a new instance. The given delegates map is copied.
*
* @param delegates the default delegates map to use
* @param defaultLoader the default loader to use if no delegate mapping exists
*/
public ClassifyingModuleLoader(final String name, final Map delegates, final ModuleLoader defaultLoader) {
super(true, false);
this.defaultLoader = defaultLoader;
this.delegates = new HashMap(delegates);
this.name = name;
}
/** {@inheritDoc} */
protected Module preloadModule(final ModuleIdentifier moduleIdentifier) throws ModuleLoadException {
String name = moduleIdentifier.getName();
int idx;
final Map delegates = this.delegates;
for (;;) {
final ModuleLoader loader = delegates.get(name);
if (loader != null) {
return preloadModule(moduleIdentifier, loader);
}
idx = name.lastIndexOf('.');
if (idx == -1) {
return preloadModule(moduleIdentifier, defaultLoader);
}
name = name.substring(0, idx);
}
}
/** {@inheritDoc} */
protected ModuleSpec findModule(final ModuleIdentifier moduleIdentifier) throws ModuleLoadException {
// We have no modules of our own!
return null;
}
/**
* Change the delegates map. A copy is made of the given map.
*
* @param delegates the new delegates map to use
*/
public void setDelegates(Map delegates) {
this.delegates = new HashMap(delegates);
}
public String toString() {
return String.format("Classifying Module Loader @%x \"%s\"", Integer.valueOf(hashCode()), name);
}
}