org.springframework.webflow.engine.support.TransitionCriteriaChain 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.support;
import java.util.Arrays;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import org.springframework.core.style.ToStringCreator;
import org.springframework.webflow.engine.AnnotatedAction;
import org.springframework.webflow.engine.TransitionCriteria;
import org.springframework.webflow.engine.WildcardTransitionCriteria;
import org.springframework.webflow.execution.RequestContext;
/**
* An ordered chain of TransitionCriteria. Iterates over each element
* in the chain, continues until one returns false or the list is exhausted. So
* in effect it will do a logical AND between the contained criteria.
*
* @author Keith Donald
*/
public class TransitionCriteriaChain implements TransitionCriteria {
/**
* The ordered chain of TransitionCriteria objects.
*/
private List criteriaChain = new LinkedList();
/**
* Creates an initially empty transition criteria chain.
* @see #add(TransitionCriteria)
*/
public TransitionCriteriaChain() {
}
/**
* Creates a transition criteria chain with the specified criteria.
* @param criteria the criteria
*/
public TransitionCriteriaChain(TransitionCriteria[] criteria) {
criteriaChain.addAll(Arrays.asList(criteria));
}
/**
* Add given criteria object to the end of the chain.
* @param criteria the criteria
* @return this object, so multiple criteria can be added in a single
* statement
*/
public TransitionCriteriaChain add(TransitionCriteria criteria) {
this.criteriaChain.add(criteria);
return this;
}
public boolean test(RequestContext context) {
Iterator it = criteriaChain.iterator();
while (it.hasNext()) {
TransitionCriteria criteria = (TransitionCriteria)it.next();
if (!criteria.test(context)) {
return false;
}
}
return true;
}
public String toString() {
return new ToStringCreator(this).append("criteriaChain", criteriaChain).toString();
}
// static helpers
/**
* Create a transition criteria chain chaining given list of actions.
* @param actions the actions (and their execution properties) to chain together
*/
public static TransitionCriteria criteriaChainFor(AnnotatedAction[] actions) {
if (actions == null || actions.length == 0) {
return WildcardTransitionCriteria.INSTANCE;
}
TransitionCriteriaChain chain = new TransitionCriteriaChain();
for (int i = 0; i < actions.length; i++) {
chain.add(new ActionTransitionCriteria(actions[i]));
}
return chain;
}
}