/*
* 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.util.Assert;
import org.springframework.util.StringUtils;
import org.springframework.webflow.core.collection.LocalAttributeMap;
import org.springframework.webflow.execution.Event;
import org.springframework.webflow.execution.RequestContext;
/**
* An action that sends a flow definition redirect when executed.
*
* @author Keith Donald
*/
public class FlowDefinitionRedirectAction extends AbstractAction {
private Expression expression;
/**
* Creates a new flow definition redirect action.
* @param expression a encoded flow redirect expression
*/
public FlowDefinitionRedirectAction(Expression expression) {
Assert.notNull(expression, "The flow definition redirect expression is required");
this.expression = expression;
}
protected Event doExecute(RequestContext context) throws Exception {
String encodedRedirect = (String) expression.getValue(context);
if (encodedRedirect == null) {
throw new IllegalStateException(
"Flow definition redirect expression evaluated to [null], the expression was " + expression);
}
// the encoded FlowDefinitionRedirect should look something like
// "flowDefinitionId?param0=value0¶m1=value1"
// now parse that and build a corresponding view selection
int index = encodedRedirect.indexOf('?');
String flowDefinitionId;
LocalAttributeMap<String> executionInput = null;
if (index != -1) {
flowDefinitionId = encodedRedirect.substring(0, index);
String[] parameters = StringUtils.delimitedListToStringArray(encodedRedirect.substring(index + 1), "&");
executionInput = new LocalAttributeMap<String>(parameters.length, 1);
for (String nameAndValue : parameters) {
index = nameAndValue.indexOf('=');
if (index != -1) {
executionInput.put(nameAndValue.substring(0, index), nameAndValue.substring(index + 1));
} else {
executionInput.put(nameAndValue, "");
}
}
} else {
flowDefinitionId = encodedRedirect;
}
if (!StringUtils.hasText(flowDefinitionId)) {
// equivalent to restart
flowDefinitionId = context.getFlowExecutionContext().getDefinition().getId();
}
context.getExternalContext().requestFlowDefinitionRedirect(flowDefinitionId, executionInput);
return success();
}
}