/*
* Copyright 2007-2008 the original author or authors.
*
* 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.impalaframework.module.operation;
import org.impalaframework.exception.InvalidStateException;
import org.impalaframework.module.ModuleDefinition;
import org.impalaframework.module.RootModuleDefinition;
import org.impalaframework.module.spi.ModificationExtractor;
import org.impalaframework.module.spi.ModificationExtractorType;
import org.impalaframework.module.spi.ModuleStateHolder;
import org.impalaframework.module.spi.TransitionSet;
import org.springframework.util.Assert;
/**
* Encapsulates operation to add a new module defintion, and reflect this new configuration on the module runtime.
*
* @author Phil Zoio
*/
public class AddModuleOperation extends BaseModuleOperation {
protected AddModuleOperation() {
super();
}
public ModuleOperationResult doExecute(ModuleOperationInput moduleOperationInput) {
Assert.notNull(moduleOperationInput, "moduleOperationInput cannot be null");
ModuleDefinition moduleToAdd = moduleOperationInput.getModuleDefinition();
Assert.notNull(moduleToAdd, "moduleName is required as it specifies the name of the module to add in " + this.getClass().getName());
ModuleStateHolder moduleStateHolder = getModuleStateHolder();
ModificationExtractor calculator = getModificationExtractorRegistry().getModificationExtractor(ModificationExtractorType.STICKY);
addModule(moduleStateHolder, calculator, moduleToAdd);
return new ModuleOperationResult(true);
}
protected void addModule(ModuleStateHolder moduleStateHolder, ModificationExtractor calculator,
ModuleDefinition moduleDefinition) {
RootModuleDefinition oldRootDefinition = moduleStateHolder.cloneRootModuleDefinition();
RootModuleDefinition newRootDefinition = moduleStateHolder.cloneRootModuleDefinition();
ModuleDefinition parent = moduleDefinition.getParentDefinition();
if (moduleDefinition instanceof RootModuleDefinition) {
newRootDefinition = (RootModuleDefinition) moduleDefinition;
}
else {
ModuleDefinition newParent = null;
if (parent == null) {
newParent = newRootDefinition;
}
else {
String parentName = parent.getName();
newParent = newRootDefinition.findChildDefinition(parentName, true);
if (newParent == null) {
throw new InvalidStateException("Unable to find parent module '" + parentName + "' in " + newRootDefinition);
}
}
newParent.addChildModuleDefinition(moduleDefinition);
moduleDefinition.setParentDefinition(newParent);
}
TransitionSet transitions = calculator.getTransitions(oldRootDefinition, newRootDefinition);
moduleStateHolder.processTransitions(transitions);
}
}