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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 2014 Attila Szegedi, Daniel Dekany, Jonathan Revusky
 * 
 * Licensed 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;
    }
    
    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));
    }
}