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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.
 */

/*
 * 22 October 1999: This class added by Holger Arendt.
 */

package freemarker.template;

import java.util.List;

import freemarker.core.Environment;

/**
 * "method" template language data type: Objects that act like functions. The name comes from that their original
 * application was calling Java methods via {@link freemarker.ext.beans.BeansWrapper}. 
 * 
 * In templates they are used like {@code myMethod("foo", "bar")} or {@code myJavaObject.myJavaMethod("foo", "bar")}. 
 * 
 * @deprecated Use {@link TemplateMethodModelEx} instead. This interface is from the old times when the only kind of
 *    value you could pass in was string.
 */
@Deprecated
public interface TemplateMethodModel extends TemplateModel {

    /**
     * Executes the method call. All arguments passed to the method call are 
     * coerced to strings before being passed, if the FreeMarker rules allow
     * the coercion. If some of the passed arguments can not be coerced to a
     * string, an exception will be raised in the engine and the method will 
     * not be called. If your method would like to act on actual data model 
     * objects instead of on their string representations, implement the 
     * {@link TemplateMethodModelEx} instead.
     * 
     * @param arguments a {@code List} of {@code String} objects
     *     containing the values of the arguments passed to the method.
     *  
     * @return the return value of the method, or {@code null}. If the returned value
     *     does not implement {@link TemplateModel}, it will be automatically 
     *     wrapped using the {@link Environment#getObjectWrapper() environment 
     *     object wrapper}.
     */
    public Object exec(List arguments) throws TemplateModelException;
}