org.simpleframework.xml.core.Function Maven / Gradle / Ivy
/*
* Function.java February 2008
*
* Copyright (C) 2008, Niall Gallagher
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation.
*
* This library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*/
package org.simpleframework.xml.core;
import java.lang.reflect.Method;
import java.util.Map;
/**
* The Function object is used to encapsulated the method
* that is called when serializing an object. This contains details
* on the type of method represented and ensures that reflection is
* not required each time the method is to be invoked.
*
* @author Niall Gallagher
*/
class Function {
/**
* This is the method that is to be invoked by the function.
*/
private final Method method;
/**
* This is used to determine if the method takes the map.
*/
private final boolean contextual;
/**
* Constructor for the Function object. This is used
* to create an object that wraps the provided method it ensures
* that no reflection is required when the method is to be called.
*
* @param method this is the method that is to be wrapped by this
*/
public Function(Method method) {
this(method, false);
}
/**
* Constructor for the Function object. This is used
* to create an object that wraps the provided method it ensures
* that no reflection is required when the method is to be called.
*
* @param method this is the method that is to be wrapped by this
* @param contextual determines if the method is a contextual one
*/
public Function(Method method, boolean contextual) {
this.contextual = contextual;
this.method = method;
}
/**
* This method used to invoke the callback method of the provided
* object. This will acquire the session map from the context. If
* the provided object is not null then this will return null.
*
* @param context this is the context that contains the session
* @param source this is the object to invoke the function on
*
* @return this returns the result of the method invocation
*/
public Object call(Context context, Object source) throws Exception {
if(source != null) {
Session session = context.getSession();
Map table = session.getMap();
if(contextual) {
return method.invoke(source, table);
}
return method.invoke(source);
}
return null;
}
}