org.jboss.modules.ClassifyingModuleLoader Maven / Gradle / Ivy
/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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.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(String name) throws ModuleLoadException {
int idx;
final Map delegates = this.delegates;
for (;;) {
final ModuleLoader loader = delegates.get(name);
if (loader != null) {
return preloadModule(name, loader);
}
idx = name.lastIndexOf('.');
if (idx == -1) {
return preloadModule(name, defaultLoader);
}
name = name.substring(0, idx);
}
}
/** {@inheritDoc} */
protected ModuleSpec findModule(final String name) 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);
}
}