org.mvel2.integration.ResolverTools Maven / Gradle / Ivy
/**
* MVEL 2.0
* Copyright (C) 2007 The Codehaus
* Mike Brock, Dhanji Prasanna, John Graham, Mark Proctor
*
* 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.mvel2.integration;
/**
* A set of tools for dealing with factorys, specifically to make chaining issues easy to deal with.
*
* @author Christopher Brock
*/
public class ResolverTools {
/**
* Based on a root factory, append the new factory to the end of the chain.
*
* @param root The root factory
* @param newFactory The new factory
* @return An instance of the new factory
*/
public static T appendFactory(VariableResolverFactory root, T newFactory) {
if (root.getNextFactory() == null) {
root.setNextFactory(newFactory);
} else {
VariableResolverFactory vrf = root;
while (vrf.getNextFactory() != null) {
vrf = vrf.getNextFactory();
}
vrf.setNextFactory(newFactory);
}
return newFactory;
}
/**
* Based on the root factory, insert the new factory right after the root, and before any other in the chain.
*
* @param root The root factory
* @param newFactory The new factory
* @return An instance of the new factory.
*/
public static T insertFactory(VariableResolverFactory root, T newFactory) {
if (root.getNextFactory() == null) {
root.setNextFactory(newFactory);
} else {
newFactory.setNextFactory(root.getNextFactory());
root.setNextFactory(newFactory);
}
return newFactory;
}
}