001// Copyright 2004, 2005 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.tapestry.binding; 016 017import org.apache.hivemind.Location; 018import org.apache.tapestry.IBinding; 019import org.apache.tapestry.IComponent; 020 021/** 022 * Creates a new instance of {@link org.apache.tapestry.IBinding}. 023 * 024 * @author Howard Lewis Ship 025 * @since 4.0 026 */ 027public interface BindingFactory 028{ 029 /** 030 * Creates a new binding instance. 031 * 032 * @param root 033 * the component that is the source of properties or messages (or etc.). When the 034 * path is "evaluated", the root component provides a context. 035 * @param description 036 * The {@link IBinding#getDescription() description}of the binding. 037 * @param expression 038 * The expression used to get (or update) a value. The interpretation of this 039 * expression is determined by the type of {@link IBinding} created by this factory. 040 * In some cases, it is simple the name of an object contained by the root component. 041 * For the common "ognl:" binding prefix, it is an OGNL expression to be evaluated on 042 * the root object. 043 * @param location 044 * The location of the binding, used to report any errors related to the binding, or 045 * to the component parameter the binding is bound to. 046 */ 047 public IBinding createBinding(IComponent root, String bindingDescription, String expression, 048 Location location); 049}