flowexecutionlistenercriteriafactory.java

来自「spring的WEB开发插件,支持多状态WEB开发」· Java 代码 · 共 93 行

/*
 * Copyright 2002-2005 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.execution;

import org.springframework.util.Assert;
import org.springframework.webflow.Flow;

/**
 * Static factory for producing common flow execution listener criteria.
 * 
 * @see org.springframework.webflow.execution.FlowExecutionListenerCriteria
 * 
 * @author Keith Donald
 * @author Erwin Vervaet
 */
public class FlowExecutionListenerCriteriaFactory {
	
	/**
	 * A flow execution listener criteria implementation that
	 * matches for all flows.
	 */
	public static class WildcardFlowExecutionListenerCriteria implements FlowExecutionListenerCriteria {
		
		/**
		 * The string representation of the wildcard flow id.
		 */
		public static final String WILDCARD_FLOW_ID = "*";
		
		public boolean applies(Flow flow) {
			return true;
		}
		
		public String toString() {
			return WILDCARD_FLOW_ID;
		}
	}

	/**
	 * A flow execution listener criteria implementation that
	 * matches flows with a specified id.
	 */
	public static class FlowIdFlowExecutionListenerCriteria implements FlowExecutionListenerCriteria {
		
		private String flowId;

		/**
		 * Create a new flow id matching flow execution listener
		 * criteria implemenation.
		 * @param flowId the flow id to match
		 */
		public FlowIdFlowExecutionListenerCriteria(String flowId) {
			Assert.notNull(flowId, "The flow id is required");
			this.flowId = flowId;
		}
		
		public boolean applies(Flow flow) {
			return flowId.equals(flow.getId());
		}
	
		public String toString() {
			return flowId;
		}
	}
	
	/**
	 * Returns a wild card criteria that matches all flows.
	 */
	public static FlowExecutionListenerCriteria allFlows() {
		return new WildcardFlowExecutionListenerCriteria();
	}

	/**
	 * Returns a criteria that just matches a flow with the specified id.
	 * @param flowId the flow id to match
	 */
	public static FlowExecutionListenerCriteria flow(String flowId) {
		return new FlowIdFlowExecutionListenerCriteria(flowId);
	}

}