/*
* Copyright 2004-2012 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.action;
import org.springframework.binding.expression.Expression;
import org.springframework.core.style.ToStringCreator;
import org.springframework.webflow.execution.Event;
import org.springframework.webflow.execution.RequestContext;
import org.springframework.webflow.execution.View;
/**
* An action that sets a special attribute that views use to render partial views called "fragments", instead of the
* entire view.
*
* @author Keith Donald
*/
public class RenderAction extends AbstractAction {
/**
* The expression for setting the scoped attribute value.
*/
private Expression[] fragmentExpressions;
/**
* Creates a new render action.
* @param fragmentExpressions the set of expressions to resolve the view fragments to render
*/
public RenderAction(Expression... fragmentExpressions) {
if (fragmentExpressions == null || fragmentExpressions.length == 0) {
throw new IllegalArgumentException(
"You must provide at least one fragment expression to this render action");
}
this.fragmentExpressions = fragmentExpressions;
}
protected Event doExecute(RequestContext context) throws Exception {
String[] fragments = new String[fragmentExpressions.length];
for (int i = 0; i < fragmentExpressions.length; i++) {
Expression exp = fragmentExpressions[i];
fragments[i] = (String) exp.getValue(context);
}
context.getFlashScope().put(View.RENDER_FRAGMENTS_ATTRIBUTE, fragments);
return success();
}
public String toString() {
return new ToStringCreator(this).append("fragments", fragmentExpressions).toString();
}
}