methodconstructor.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.aop.reflection;

import java.lang.reflect.Method;

import com.jdon.bussinessproxy.TargetMetaDef;
import com.jdon.bussinessproxy.meta.MethodMetaArgs;
import com.jdon.bussinessproxy.target.TargetServiceFactory;
import com.jdon.container.ContainerWrapper;
import com.jdon.container.access.TargetMetaRequest;
import com.jdon.container.visitor.ComponentVisitor;
import com.jdon.util.Debug;

public class MethodConstructor {

    private final static String module = MethodConstructor.class.getName();

    private MethodInvokerUtil methodInvokerUtil = new MethodInvokerUtil();
    
    
    
    /**
     * @return Returns the methodInvokerUtil.
     */
    public MethodInvokerUtil getMethodInvokerUtil() {
        return methodInvokerUtil;
    }
    
    /**
     * ejb's method creating must at first get service's EJB Object;
     * pojo's method creating can only need service's class. 
     *  
     * @param targetServiceFactory
     * @param targetMetaRequest
     * @param methodMetaArgs
     * @return
     */
    public Method createMethod(TargetServiceFactory targetServiceFactory, 
                               TargetMetaRequest targetMetaRequest, 
                               MethodMetaArgs methodMetaArgs) {
        Method method = null;
        Debug.logVerbose(" createMethod " , module);
        try {
            if (targetMetaRequest.getTargetMetaDef().isEJB()) { 
                Object obj= methodInvokerUtil.createTargetObject(targetServiceFactory, targetMetaRequest);
                method = createObjectMethod(obj, methodMetaArgs);
            }else{
                method = createPojoMethod(targetMetaRequest, methodMetaArgs);
            }
        } catch (Exception ex) {
            Debug.logError(" createMethod error: " + ex, module);
        }
        
        return method;

    }
    
    
    /**
     * create a method object by its meta definition
     * @param targetMetaDef
     * @param cw
     * @param methodMetaArgs
     */
    public Method createPojoMethod(TargetMetaRequest targetMetaRequest, MethodMetaArgs methodMetaArgs) {
        Method method = null;
        TargetMetaDef targetMetaDef = targetMetaRequest.getTargetMetaDef();
        Debug.logVerbose(" createPOJO Method :" + targetMetaDef.getName(), module);
        try {       
            ComponentVisitor cm = targetMetaRequest.getComponentVisitor();            
            Class thisCLass = cm.getContainerWrapper().getComponentClass(targetMetaDef.getName());            
            if (thisCLass == null) return null;
            method = thisCLass.getMethod(methodMetaArgs.getMethodName(),
                    methodMetaArgs.getParamTypes());
        } catch (NoSuchMethodException ne) {
            Debug.logError(" no this method name:"
                    + methodMetaArgs.getMethodName() + " or method's args type error", module);
        } catch (Exception ex) {
            Debug.logError(" error: " + ex, module);
        }
        
        return method;

    }
    
    /**
     * create a method object by target Object
     * @param ownerClass
     * @param methodMetaArgs
     * @return
     */
    public Method createObjectMethod(Object ownerClass, MethodMetaArgs methodMetaArgs) {
        Method m = null;        
        try {
            m = ownerClass.getClass().getMethod(methodMetaArgs.getMethodName(), 
                                                methodMetaArgs.getParamTypes());
        } catch (NoSuchMethodException nsme) {
            String errS = " NoSuchMethod:" + methodMetaArgs.getMethodName() + " in MethodMetaArgs of className:"
                    + ownerClass.getClass().getName();
            Debug.logError(errS, module);
        } catch (Exception ex) {
            Debug.logError(" createMethod error:" + ex, module);
        }
        return m;
    }
    
    /**
     * create a method object 
     * @param ownerClass
     * @param methodName
     * @param paramTypes
     * @return
     */
    public Method createObjectMethod(Object ownerClass, String methodName,
            Class[] paramTypes) {
        Method m = null;
        try {
            m = ownerClass.getClass().getMethod(methodName, paramTypes);
        } catch (NoSuchMethodException nsme) {
            String errS = " NoSuchMethod:" + methodName + " in className:"
                    + ownerClass.getClass().getName() + " or method's args type error";
            Debug.logError(errS, module);
        } catch (Exception ex) {
            Debug.logError(" createMethod error:" + ex, module);
        }
        return m;
    }

}