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Common code for integration of Tiles for different templating technologies.

There is a newer version: 3.0.8

/*
 * $Id: AddAttributeModel.java 1305937 2012-03-27 18:15:15Z nlebas $
 *
 * 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.template;

import java.io.IOException;
import java.util.Deque;

import org.apache.tiles.Attribute;
import org.apache.tiles.Expression;
import org.apache.tiles.ListAttribute;
import org.apache.tiles.autotag.core.runtime.ModelBody;
import org.apache.tiles.request.Request;

/**
 * 
 * Add an element to the surrounding list. Equivalent to 'putAttribute',
 * but for list element.
 * 
 *
 * 
 * Add an element to the surrounding list. This tag can only be used inside
 * 'putListAttribute' or 'addListAttribute' tags. Value can come from a direct
 * assignment (value="aValue")
 * 
 *
 * @version $Rev: 1305937 $ $Date: 2012-03-27 20:15:15 +0200 (Tue, 27 Mar 2012) $
 * @since 2.2.0
 */
public class AddAttributeModel {

    /**
     * Executes the operation.
     * @param value The value of the attribute. Use this parameter, or
     * expression, or body.
     * @param expression The expression to calculate the value from. Use this
     * parameter, or value, or body.
     * @param role A comma-separated list of roles. If present, the attribute
     * will be rendered only if the current user belongs to one of the roles.
     * @param type The type (renderer) of the attribute.
     * @param request The request.
     * @param modelBody The body.
     * @throws IOException If the body cannot be correctly evaluated.
     * @since 2.2.0
     */
    public void execute(Object value, String expression, String role,
            String type, Request request, ModelBody modelBody)
            throws IOException {
        Attribute attribute = new Attribute();
        Deque