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Nuts'n'Bolts Utilities
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/*
 * Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 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 either, at your discretion...
 *
 * 1) 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.
 *
 * ...or...
 *
 * 2) The terms of the Apache License, Version 2.0.
 *
 * 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 or Apache License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * and the Apache License along with the SmallMind Code Project. If not, see
 *  or .
 *
 * 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());
  }
}