| // Copyright 2006, 2010 The Apache Software Foundation |
| // |
| // Licensed 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.tapestry5.ioc; |
| |
| import org.apache.tapestry5.ioc.internal.util.InternalUtils; |
| |
| /** |
| * A wrapper that allows objects of a target type to be ordered. Each Orderable object is given a unique id and a set of |
| * pre-requisites (objects which should be ordered earlier) and post-requisites (objects which should be ordered |
| * later). |
| * |
| * @param <T> |
| */ |
| public class Orderable<T> |
| { |
| private final String id; |
| |
| private final T target; |
| |
| private final String[] constraints; |
| |
| /** |
| * @param id unique identifier for the target object |
| * @param target the object to be ordered; this may also be null (in which case the id represents a placeholder) |
| */ |
| |
| public Orderable(String id, T target, String... constraints) |
| { |
| assert InternalUtils.isNonBlank(id); |
| this.id = id; |
| this.target = target; |
| this.constraints = constraints; |
| } |
| |
| public String getId() |
| { |
| return id; |
| } |
| |
| public T getTarget() |
| { |
| return target; |
| } |
| |
| public String[] getConstraints() |
| { |
| return constraints; |
| } |
| |
| @Override |
| public String toString() |
| { |
| StringBuilder buffer = new StringBuilder("Orderable["); |
| |
| buffer.append(id); |
| |
| for (String c : constraints) |
| { |
| buffer.append(" "); |
| buffer.append(c); |
| } |
| |
| buffer.append(" "); |
| buffer.append(target.toString()); |
| buffer.append("]"); |
| |
| return buffer.toString(); |
| } |
| } |