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Google App Engine compliant variation of FreeMarker. FreeMarker is a "template engine"; a generic tool to generate text output based on templates.
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/*
 * Copyright (c) 2003 The Visigoth Software Society. All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowledgement:
 *       "This product includes software developed by the
 *        Visigoth Software Society (http://www.visigoths.org/)."
 *    Alternately, this acknowledgement may appear in the software itself,
 *    if and wherever such third-party acknowledgements normally appear.
 *
 * 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the 
 *    project contributors may be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact [email protected].
 *
 * 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
 *    nor may "FreeMarker" or "Visigoth" appear in their names
 *    without prior written permission of the Visigoth Software Society.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Visigoth Software Society. For more
 * information on the Visigoth Software Society, please see
 * http://www.visigoths.org/
 */

package freemarker.ext.beans;

import java.lang.reflect.Member;
import java.util.List;

import freemarker.template.TemplateModelException;

class MethodMap
{
    private final String name;
    private final BeansWrapper wrapper;
    private final OverloadedMethod fixArgMethod = new OverloadedFixArgMethod();
    private OverloadedMethod varArgMethod;
    
    MethodMap(String name, BeansWrapper wrapper) {
        this.name = name;
        this.wrapper = wrapper;
    }
    
    BeansWrapper getWrapper() {
        return wrapper;
    }
    
    void addMember(Member member) {
        fixArgMethod.addMember(member);
        if(MethodUtilities.isVarArgs(member)) {
            if(varArgMethod == null) {
                varArgMethod = new OverloadedVarArgMethod();
            }
            varArgMethod.addMember(member);
        }
    }
    
    MemberAndArguments getMemberAndArguments(List arguments) 
    throws TemplateModelException {
        Object memberAndArguments = fixArgMethod.getMemberAndArguments(arguments, wrapper);
        if(memberAndArguments == OverloadedMethod.NO_SUCH_METHOD) {
            if(varArgMethod != null) {
                memberAndArguments = varArgMethod.getMemberAndArguments(arguments, wrapper);
            }
            if(memberAndArguments == OverloadedMethod.NO_SUCH_METHOD) {
                throw new TemplateModelException("No signature of method " + 
                        name + " matches the arguments");
            }
        }
        if(memberAndArguments == OverloadedMethod.AMBIGUOUS_METHOD) {
            throw new TemplateModelException("Multiple signatures of method " + 
                    name + " match the arguments");
        }
        return (MemberAndArguments)memberAndArguments;
    }
}