| /* |
| * $Id$ |
| * |
| * 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; |
| |
| /** |
| * <p> |
| * <strong>Add an element to the surrounding list. Equivalent to 'putAttribute', |
| * but for list element.</strong> |
| * </p> |
| * |
| * <p> |
| * 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") |
| * </p> |
| * |
| * @version $Rev$ $Date$ |
| * @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<Object> composeStack = ComposeStackUtil.getComposeStack(request); |
| composeStack.push(attribute); |
| String body = modelBody.evaluateAsString(); |
| attribute = (Attribute) composeStack.pop(); |
| addAttributeToList(attribute, composeStack, value, expression, body, |
| role, type); |
| } |
| |
| /** |
| * Adds the attribute to the containing list attribute. |
| * |
| * @param attribute The attribute to add to the list attribute. |
| * @param composeStack The composing stack. |
| * @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 body The body of the tag. Use this parameter, or value, or |
| * expression. |
| * @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. |
| * @since 2.2.0 |
| */ |
| private void addAttributeToList(Attribute attribute, |
| Deque<Object> composeStack, Object value, String expression, |
| String body, String role, String type) { |
| ListAttribute listAttribute = (ListAttribute) ComposeStackUtil |
| .findAncestorWithClass(composeStack, ListAttribute.class); |
| |
| if (listAttribute == null) { |
| throw new NullPointerException("There is no ListAttribute in the stack"); |
| } |
| if (value != null) { |
| attribute.setValue(value); |
| } else if (attribute.getValue() == null && body != null) { |
| attribute.setValue(body); |
| } |
| if (expression != null) { |
| attribute.setExpressionObject(Expression |
| .createExpressionFromDescribedExpression(expression)); |
| } |
| if (role != null) { |
| attribute.setRole(role); |
| } |
| if (type != null) { |
| attribute.setRenderer(type); |
| } |
| listAttribute.add(attribute); |
| } |
| } |