| /* |
| * Copyright 1999-2004 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.cocoon.woody.formmodel; |
| |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.ListIterator; |
| |
| // TODO: The exception messages should use I18n. |
| /** |
| * This is the "{@link WidgetDefinition}" which is used to instantiate a |
| * {@link ClassDefinition}. The resolve step replaces this definition with |
| * the definitions contained in the referenced {@link ClassDefinition}. |
| * |
| * @author Timothy Larson |
| * @version $Id: NewDefinition.java,v 1.3 2004/03/05 13:02:32 bdelacretaz Exp $ |
| */ |
| public class NewDefinition extends AbstractWidgetDefinition { |
| private boolean resolving; |
| private ClassDefinition classDefinition; |
| |
| public NewDefinition() { |
| super(); |
| resolving = false; |
| classDefinition = null; |
| } |
| |
| private ClassDefinition getClassDefinition() throws Exception { |
| FormDefinition formDefinition = getFormDefinition(); |
| WidgetDefinition classDefinition = formDefinition.getWidgetDefinition(getId()); |
| if (classDefinition == null) |
| throw new Exception("NewDefinition: Class with id \"" + getId() + "\" does not exist (" + getLocation() + ")"); |
| if (!(classDefinition instanceof ClassDefinition)) |
| throw new Exception("NewDefinition: Id \"" + getId() + "\" is not a class (" + getLocation() + ")"); |
| return (ClassDefinition)classDefinition; |
| } |
| |
| // TODO: Should add checking for union defaults which would cause non-terminating recursion. |
| public void resolve(List parents, WidgetDefinition parent) throws Exception { |
| // Non-terminating recursion detection |
| if (resolving) { |
| // Search up parent list in hopes of finding a "Union" before finding previous "New" for this "Class". |
| ListIterator parentsIt = parents.listIterator(parents.size()); |
| while(parentsIt.hasPrevious()) { |
| WidgetDefinition definition = (WidgetDefinition)parentsIt.previous(); |
| if (definition instanceof UnionDefinition) break; |
| if (definition == this) |
| throw new Exception("NewDefinition: Non-terminating recursion detected in widget definition : " |
| + parent.getId() + " (" + getLocation() + ")"); |
| } |
| } |
| // Resolution |
| resolving = true; |
| parents.add(this); |
| classDefinition = getClassDefinition(); |
| Iterator definitionsIt = classDefinition.getWidgetDefinitions().iterator(); |
| parents.add(this); |
| while (definitionsIt.hasNext()) { |
| WidgetDefinition definition = (WidgetDefinition)definitionsIt.next(); |
| if (definition instanceof ContainerDefinition) { |
| ((ContainerDefinition)definition).resolve(parents, parent); |
| } |
| if (!(definition instanceof NewDefinition)) { |
| ((ContainerDefinition)parent).addWidgetDefinition(definition); |
| } |
| } |
| parents.remove(parents.size()-1); |
| resolving = false; |
| } |
| |
| public Widget createInstance() { |
| return null; |
| } |
| } |