/*

  * $Id: ModelBody.java 1044817 2010-12-12 13:22:01Z apetrelli $

  *

  * 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 org.apache.tiles.autotag.core.runtime;

 import java.io.IOException;

 import java.io.Writer;

 /**

  * Abstracts a tag/directive body.

  *

  * @version $Rev: 1044817 $ $Date: 2010-12-12 14:22:01 +0100 (Sun, 12 Dec 2010) $

  */

 public interface ModelBody {

     /**

      * Evaluates a body and returns it as a string.

      *

      * @return The body, as a string.

      * @throws IOException If something goes wrong.

      */

     String evaluateAsString() throws IOException;

     /**

      * Evaluates a body, but discards result.

      *

      * @throws IOException If something goes wrong.

      */

     void evaluateWithoutWriting() throws IOException;

     /**

      * Evaluates the body and writes in the default writer.

      *

      * @throws IOException If something goes wrong.

      */

     void evaluate() throws IOException;

     /**

      * Evaluates the body and writes the result in the writer.

      *

      * @param writer The writer to write the result into.

      * @throws IOException If something goes wrong.

      */

     void evaluate(Writer writer) throws IOException;

 }