componentoriginalvisitor.java

一个非常好的FRAMWRK!是一个外国组织做的!不!

/*
 * Copyright 2003-2005 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 com.jdon.container.visitor;

import com.jdon.container.ContainerWrapper;
import com.jdon.container.access.TargetMetaRequest;
import com.jdon.container.finder.ContainerCallback;
import com.jdon.container.visitor.data.SessionContext;
import com.jdon.util.Debug;

/**
 * 
 * original impleplements for target service components that will be cached
 * 
 * @author <a href="mailto:[e-mail]">banq</a>
 *
 */
public class ComponentOriginalVisitor implements ComponentVisitor{
    private final static String module = ComponentOriginalVisitor.class.getName();
        
    private ContainerCallback containerCallback;
    public ComponentOriginalVisitor(ContainerCallback containerCallback) {
        this.containerCallback = containerCallback;        
    }
    
    
    
    /**
     * @return Returns the containerWrapper.
     */
    public ContainerWrapper getContainerWrapper() {
        return containerCallback.getContainerWrapper();
    }
    /**
     * find the visitable component from container,
     * and execute it's accept method, the return result
     * is the tager service object.
     * 
     */
    public Object visit(TargetMetaRequest targetMetaRequest){
        Object o = null;
        try{
            ContainerWrapper containerWrapper = containerCallback.getContainerWrapper();
            Debug.logVerbose(" ComponentOriginalVisitor active:" + targetMetaRequest.getVisitableName(), module);
            Visitable vo = (Visitable)containerWrapper.lookup(targetMetaRequest.getVisitableName());
            o = vo.accept(targetMetaRequest);            
        }catch(Exception ex){
            Debug.logError(" ComponentOriginalVisitor active error: " + ex);
        }
        return o;        
    }
    
    public SessionContext visitSessionContext(TargetMetaRequest targetMetaRequest){
        return (SessionContext)visit(targetMetaRequest);
    }

}