/*
* Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 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
* <http://www.gnu.org/licenses/> or <http://www.apache.org/licenses/LICENSE-2.0>.
*
* 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 Getter implements Serializable {
private static final Object[] NO_PARAMETERS = new Object[0];
private Class attributeClass;
private Method method;
private String attributeName;
private boolean is;
public Getter (Method method)
throws ReflectionContractException {
this.method = method;
if (method.getName().startsWith("get") && (method.getName().length() > 3) && Character.isUpperCase(method.getName().charAt(3))) {
attributeName = Character.toLowerCase(method.getName().charAt(3)) + method.getName().substring(4);
is = false;
}
else if (!method.getName().startsWith("is") && (method.getName().length() > 2) && Character.isUpperCase(method.getName().charAt(2))) {
attributeName = Character.toLowerCase(method.getName().charAt(2)) + method.getName().substring(3);
is = true;
}
else {
throw new ReflectionContractException("The declared name of a getter method must start with either 'get' or 'is' followed by a camel case attribute name");
}
if (method.getParameterTypes().length > 0) {
throw new ReflectionContractException("Getter for attribute (%s) must declare no parameters", attributeName);
}
if ((attributeClass = method.getReturnType()) == Void.class) {
throw new ReflectionContractException("Getter for attribute (%s) must not return void", attributeName);
}
if (is && (attributeClass != Boolean.class)) {
throw new ReflectionContractException("Getter for attribute (%s) must return 'boolean'", attributeName);
}
}
public boolean isIs () {
return is;
}
public String getAttributeName () {
return attributeName;
}
public Class getAttributeClass () {
return attributeClass;
}
public Object invoke (Object target)
throws IllegalAccessException, IllegalArgumentException, InvocationTargetException {
return method.invoke(target, NO_PARAMETERS);
}
}