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FreeMarker is a "template engine"; a generic tool to generate text output based on templates.

There is a newer version: 2.3.33

/*
 * 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.template;

import java.io.IOException;
import java.io.Writer;

/**
 * Represents the nested content of a directive ({@link TemplateDirectiveModel}) invocation. An implementation of this 
 * class is passed to {@link TemplateDirectiveModel#execute(freemarker.core.Environment, 
 * java.util.Map, TemplateModel[], TemplateDirectiveBody)}. The implementation of the method is 
 * free to invoke it for any number of times, with any writer.
 *
 * @since 2.3.11
 */
public interface TemplateDirectiveBody {
    /**
     * Renders the body of the directive body to the specified writer. The 
     * writer is not flushed after the rendering. If you pass the environment's
     * writer, there is no need to flush it. If you supply your own writer, you
     * are responsible to flush/close it when you're done with using it (which
     * might be after multiple renderings).
     * @param out the writer to write the output to.
     */
    public void render(Writer out) throws TemplateException, IOException;
}