org.jboss.modules.security.PermissionFactory Maven / Gradle / Ivy
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* 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.security;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.security.Permission;
/**
* A factory for {@link Permission} objects.
*
* @author David M. Lloyd
*/
public interface PermissionFactory {
/**
* Construct a new instance of the permission. The instance may be cached.
*
* @return the permission
*/
Permission construct();
/**
* Utility method to reflectively construct a permission from a given class.
*
* @param permissionClass the permission class
* @param targetName the optional target name
* @param permissionActions the optional actions name
* @return the permission
* @throws IllegalAccessException if the necessary constructor is not accessible
* @throws InvocationTargetException if the constructor failed
* @throws InstantiationException if the object could not be instantiated for some reason
* @throws NoSuchMethodException if none of the candidate constructors exist on the class
*/
static Permission constructFromClass(Class permissionClass, String targetName, String permissionActions) throws IllegalAccessException, InvocationTargetException, InstantiationException, NoSuchMethodException {
final Constructor constructor;
boolean hasTarget = targetName != null && ! targetName.isEmpty();
boolean hasAction = permissionActions != null && ! permissionActions.isEmpty();
if (hasTarget && hasAction) {
Constructor test;
try {
test = permissionClass.getConstructor(String.class, String.class);
} catch (NoSuchMethodException ignored) {
try {
test = permissionClass.getConstructor(String.class);
hasAction = false;
} catch (NoSuchMethodException ignored2) {
test = permissionClass.getConstructor();
hasTarget = false;
hasAction = false;
}
}
constructor = test;
} else if (hasTarget) {
assert ! hasAction;
Constructor test;
try {
test = permissionClass.getConstructor(String.class);
} catch (NoSuchMethodException ignored) {
try {
test = permissionClass.getConstructor(String.class, String.class);
hasAction = true;
} catch (NoSuchMethodException ignored2) {
test = permissionClass.getConstructor();
hasTarget = false;
hasAction = false;
}
}
constructor = test;
} else {
constructor = permissionClass.getConstructor();
}
if (hasTarget && hasAction) {
return constructor.newInstance(targetName, permissionActions);
} else if (hasTarget) {
return constructor.newInstance(targetName);
} else {
return constructor.newInstance();
}
}
}