org.springframework.webflow.engine.AnnotatedAction Maven / Gradle / Ivy
/*
* Copyright 2002-2006 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.springframework.webflow.engine;
import org.springframework.core.style.ToStringCreator;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
import org.springframework.webflow.core.collection.AttributeMap;
import org.springframework.webflow.execution.Action;
import org.springframework.webflow.execution.Event;
import org.springframework.webflow.execution.RequestContext;
/**
* An action proxy/decorator that stores arbitrary properties about a target
* Action implementation for use within a specific Action
* execution context, for example an ActionState definition, a
* TransitionCriteria definition, or in a test environment.
*
* An annotated action is an action that wraps another action (referred to as
* the target action), setting up the target action's execution attributes
* before invoking {@link Action#execute}.
*
* @author Keith Donald
* @author Erwin Vervaet
*/
public class AnnotatedAction extends AnnotatedObject implements Action {
// well known attributes
/**
* The action name attribute ("name").
*
* The name attribute is often used as a qualifier for an action's result
* event, and is typically used to allow the flow to respond to a specific
* action's outcome within a larger action execution chain.
* @see ActionState
*/
public static final String NAME_ATTRIBUTE = "name";
/**
* The action execution method attribute ("method").
*
* The method property is a hint about what method should be invoked; for
* example, the name of a specific target method on a
* {@link org.springframework.webflow.action.MultiAction multi action}.
* @see ActionState
*/
public static final String METHOD_ATTRIBUTE = "method";
/**
* The target action to execute.
*/
private Action targetAction;
/**
* Creates a new annotated action object for the specified action. No
* contextual properties are provided.
* @param targetAction the action
*/
public AnnotatedAction(Action targetAction) {
setTargetAction(targetAction);
}
/**
* Returns the wrapped target action.
* @return the action
*/
public Action getTargetAction() {
return targetAction;
}
/**
* Set the target action wrapped by this decorator.
*/
public void setTargetAction(Action targetAction) {
Assert.notNull(targetAction, "The targetAction to annotate is required");
this.targetAction = targetAction;
}
/**
* Returns the name of a named action, or null if the action
* is unnamed. Used when mapping action result events to transitions.
* @see #isNamed()
* @see #postProcessResult(Event)
*/
public String getName() {
return getAttributeMap().getString(NAME_ATTRIBUTE);
}
/**
* Sets the name of a named action. This is optional and can be
* null.
* @param name the action name
*/
public void setName(String name) {
getAttributeMap().put(NAME_ATTRIBUTE, name);
}
/**
* Returns whether or not the wrapped target action is a named action.
* @see #getName()
* @see #setName(String)
*/
public boolean isNamed() {
return StringUtils.hasText(getName());
}
/**
* Returns the name of the action method to invoke when the target action is
* executed.
*/
public String getMethod() {
return getAttributeMap().getString(METHOD_ATTRIBUTE);
}
/**
* Sets the name of the action method to invoke when the target action is
* executed.
* @param method the action method name
*/
public void setMethod(String method) {
getAttributeMap().put(METHOD_ATTRIBUTE, method);
}
public Event execute(RequestContext context) throws Exception {
AttributeMap originalAttributes = getAttributeMap();
try {
context.setAttributes(getAttributeMap());
Event result = getTargetAction().execute(context);
return postProcessResult(result);
}
finally {
// restore original attributes
context.setAttributes(originalAttributes);
}
}
/**
* Get the event id to be used as grounds for a transition in the containing
* state, based on given result returned from action execution.
*
* If the wrapped action is named, the name will be used as a qualifier for
* the event (e.g. "myAction.success").
* @param resultEvent the action result event
*/
protected Event postProcessResult(Event resultEvent) {
if (resultEvent == null) {
return null;
}
if (isNamed()) {
// qualify result event id with action name for a named action
String qualifiedId = getName() + "." + resultEvent.getId();
resultEvent = new Event(resultEvent.getSource(), qualifiedId, resultEvent.getAttributes());
}
return resultEvent;
}
public String toString() {
return new ToStringCreator(this).append("targetAction", getTargetAction())
.append("attributes", getAttributeMap()).toString();
}
}