001// Copyright 2007, 2008 The Apache Software Foundation 002// 003// Licensed under the Apache License, Version 2.0 (the "License"); 004// you may not use this file except in compliance with the License. 005// You may obtain a copy of the License at 006// 007// http://www.apache.org/licenses/LICENSE-2.0 008// 009// Unless required by applicable law or agreed to in writing, software 010// distributed under the License is distributed on an "AS IS" BASIS, 011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012// See the License for the specific language governing permissions and 013// limitations under the License. 014 015package org.apache.tapestry5; 016 017/** 018 * A block is a collection of static text and elements, and components, derived from a component template. In the 019 * template, a block is demarcated using the <t:block> or <t:parameter> elements. The interface defines no 020 * methods, but the provided implementations of Block are capable of rendering their contents on demand. 021 * <p/> 022 * Tapestry includes coecions from String to {@link org.apache.tapestry5.Renderable} and {@link 023 * org.apache.tapestry5.Renderable} to Block. This means that components that take Block parameters may be bound to 024 * literal strings, to arbitrary numbers (or other objects, with the expectation that they will be converted to 025 * strings), or to renderable objects such as components. 026 */ 027public interface Block 028{ 029 030}