org.smallmind.nutsnbolts.reflection.aop.AOPUtility.java Source code

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Here is the source code for org.smallmind.nutsnbolts.reflection.aop.AOPUtility.java

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/*
 * Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015 David Berkman
 * 
 * This file is part of the SmallMind Code Project.
 * 
 * The SmallMind Code Project is free software, you can redistribute
 * it and/or modify it under the terms of GNU Affero General Public
 * License as published by the Free Software Foundation, either version 3
 * of the License, or (at your option) any later version.
 * 
 * The SmallMind Code Project is distributed in the hope that it will
 * be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the the GNU Affero General Public
 * License, along with the SmallMind Code Project. If not, see
 * <http://www.gnu.org/licenses/>.
 * 
 * Additional permission under the GNU Affero GPL version 3 section 7
 * ------------------------------------------------------------------
 * If you modify this Program, or any covered work, by linking or
 * combining it with other code, such other code is not for that reason
 * alone subject to any of the requirements of the GNU Affero GPL
 * version 3.
 */
package org.smallmind.nutsnbolts.reflection.aop;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.reflect.MethodSignature;
import org.smallmind.nutsnbolts.reflection.bean.BeanAccessException;
import org.smallmind.nutsnbolts.reflection.bean.BeanInvocationException;
import org.smallmind.nutsnbolts.reflection.bean.BeanUtility;

public class AOPUtility {

    public static Object getParameterValue(JoinPoint joinPoint, String parameterName, boolean nullable)
            throws BeanAccessException, BeanInvocationException {

        Object argumentValue;
        MethodSignature methodSignature = ((MethodSignature) joinPoint.getSignature());
        String[] parameterNames;
        String baseParameter;
        String parameterGetter = null;
        int dotPos;

        if ((dotPos = parameterName.indexOf('.')) < 0) {
            baseParameter = parameterName;
        } else {
            baseParameter = parameterName.substring(0, dotPos);
            parameterGetter = parameterName.substring(dotPos + 1);
        }

        parameterNames = methodSignature.getParameterNames();
        for (int index = 0; index < parameterNames.length; index++) {
            if (parameterNames[index].equals(baseParameter)) {
                argumentValue = (parameterGetter == null) ? joinPoint.getArgs()[index]
                        : BeanUtility.executeGet(joinPoint.getArgs()[index], parameterGetter, nullable);

                if (argumentValue == null) {
                    if (methodSignature.getParameterTypes()[index].isPrimitive()) {
                        throw new BeanAccessException(
                                "A 'null' parameter can't be assigned to the primitive type '%s'",
                                methodSignature.getParameterTypes()[index]);
                    } else if (!nullable) {
                        throw new NullPointerException("Null value in a non-nullable parameter access");
                    }
                }

                return argumentValue;
            }
        }

        throw new BeanAccessException("The parameter(%s) was not found as part of the method(%s) signature",
                baseParameter, methodSignature.getName());
    }
}