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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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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package freemarker.ext.rhino;

import java.util.List;

import org.mozilla.javascript.Context;
import org.mozilla.javascript.Function;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.ScriptableObject;

import freemarker.ext.beans.BeansWrapper;
import freemarker.template.TemplateMethodModelEx;
import freemarker.template.TemplateModel;
import freemarker.template.TemplateModelException;

/**
 */
public class RhinoFunctionModel extends RhinoScriptableModel 
implements TemplateMethodModelEx {

    private final Scriptable fnThis;
    
    public RhinoFunctionModel(Function function, Scriptable fnThis, 
            BeansWrapper wrapper) {
        super(function, wrapper);
        this.fnThis = fnThis;
    }
    
    @Override
    public Object exec(List arguments) throws TemplateModelException {
        Context cx = Context.getCurrentContext();
        Object[] args = arguments.toArray();
        BeansWrapper wrapper = getWrapper();
        for (int i = 0; i < args.length; i++) {
            args[i] = wrapper.unwrap((TemplateModel) args[i]);
        }
        return wrapper.wrap(((Function) getScriptable()).call(cx, 
                ScriptableObject.getTopLevelScope(fnThis), fnThis, args));
    }
}