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Nuts'n'Bolts Utilities
There is a newer version: 6.2.0
/*
 * 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;

import java.io.Serializable;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class Setter implements Serializable {

  private final Class attributeClass;
  private final Method method;
  private final String attributeName;

  public Setter (Method method)
    throws ReflectionContractException {

    this.method = method;

    if (!(method.getName().startsWith("set") && (method.getName().length() > 3) && Character.isUpperCase(method.getName().charAt(3)))) {
      throw new ReflectionContractException("The declared name of a setter method must start with 'set' followed by a camel case attribute name");
    }

    attributeName = Character.toLowerCase(method.getName().charAt(3)) + method.getName().substring(4);

    if (!(method.getReturnType().equals(Void.class) || method.getReturnType().equals(void.class))) {
      throw new ReflectionContractException("Setter for attribute (%s) must return void", attributeName);
    }
    if (method.getParameterTypes().length != 1) {
      throw new ReflectionContractException("Setter for attribute (%s) must declare a single parameter", attributeName);
    }

    attributeClass = method.getParameterTypes()[0];
  }

  public String getAttributeName () {

    return attributeName;
  }

  public Class getAttributeClass () {

    return attributeClass;
  }

  public Object invoke (Object target, Object value)
    throws IllegalAccessException, IllegalArgumentException, InvocationTargetException {

    Object[] parameter = {value};

    return method.invoke(target, parameter);
  }
}