reflectionmetamethod.java

来自「Groovy动态语言 运行在JVM中的动态语言 可以方便的处理业务逻辑变化大的业」· Java 代码 · 共 79 行

/*
 * $Id: ReflectionMetaMethod.java 4254 2006-11-23 20:38:19Z blackdrag $
 *
 * Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.
 *
 * Redistribution and use of this software and associated documentation
 * ("Software"), with or without modification, are permitted provided that the
 * following conditions are met:
 *  1. Redistributions of source code must retain copyright statements and
 * notices. Redistributions must also contain a copy of this document.
 *  2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *  3. The name "groovy" must not be used to endorse or promote products
 * derived from this Software without prior written permission of The Codehaus.
 * For written permission, please contact [e-mail].
 *  4. Products derived from this Software may not be called "groovy" nor may
 * "groovy" appear in their names without prior written permission of The
 * Codehaus. "groovy" is a registered trademark of The Codehaus.
 *  5. Due credit should be given to The Codehaus - http://groovy.codehaus.org/
 *
 * THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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 */
package org.codehaus.groovy.runtime;

import groovy.lang.MetaMethod;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedAction;

public class ReflectionMetaMethod extends MetaMethod {
    private Method method;
    boolean alreadySetAccessible;

    public ReflectionMetaMethod(Method method) {
        super(method);
        this.method = method;
    }

    public Object invoke(Object object, Object[] arguments) {
    	if ( !alreadySetAccessible ) {
	    	AccessController.doPrivileged(new PrivilegedAction() {
	    		public Object run() {
	    			method.setAccessible(true);
	                return null;
	    		}
	    	});
	    	alreadySetAccessible = true;
    	}

        //        System.out.println("About to invoke method: " + method);
        //        System.out.println("Object: " + object);
        //        System.out.println("Using arguments: " + InvokerHelper.toString(arguments));

        try {
            return method.invoke(object, arguments);
        } catch (IllegalArgumentException e) {
            throw new InvokerInvocationException(e);
        } catch (IllegalAccessException e) {
            throw new InvokerInvocationException(e);
        } catch (InvocationTargetException e) {
            throw new InvokerInvocationException(e);
        }
    }
}