| /* |
| * 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.cocoon.forms.formmodel; |
| |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.ListIterator; |
| |
| import org.apache.cocoon.forms.FormsException; |
| |
| // 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}. |
| * |
| * @version $Id$ |
| */ |
| public class NewDefinition extends AbstractWidgetDefinition { |
| |
| private boolean resolving; |
| |
| |
| public NewDefinition() { |
| super(); |
| } |
| |
| private ClassDefinition getClassDefinition() throws Exception { |
| FormDefinition formDefinition = getFormDefinition(); |
| WidgetDefinition classDefinition = null; |
| |
| // we found a form definition to ask |
| if (formDefinition != null) { |
| classDefinition = formDefinition.getWidgetDefinition(getId()); |
| |
| if (classDefinition == null) { // not found in local form, try library |
| classDefinition = formDefinition.getLocalLibrary().getDefinition(getId()); |
| } |
| } |
| |
| if (classDefinition == null && getEnclosingLibrary() != null) { // not found in form's library, so ask enclosing library |
| classDefinition = getEnclosingLibrary().getDefinition(getId()); |
| } |
| |
| if (classDefinition == null) { |
| throw new FormsException("NewDefinition: Class with id '" + getId() + "' does not exist.", |
| getLocation()); |
| } |
| |
| if (!(classDefinition instanceof ClassDefinition)) { |
| throw new FormsException("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 FormsException("NewDefinition: Non-terminating recursion detected in widget definition '" + parent.getId() + "'.", |
| getLocation()); |
| } |
| } |
| } |
| |
| // Resolution |
| resolving = true; |
| parents.add(this); |
| Iterator definitionsIt = getClassDefinition().getWidgetDefinitions().iterator(); |
| parents.add(this); |
| while (definitionsIt.hasNext()) { |
| WidgetDefinition definition = (WidgetDefinition) definitionsIt.next(); |
| // Recursively resolve containers |
| if (definition instanceof ContainerDefinition) { |
| ((ContainerDefinition) definition).resolve(parents, parent); |
| } |
| |
| // Add the current definition if it's not itself a "fd:new" |
| if (definition instanceof NewDefinition) { |
| ((NewDefinition) definition).resolve(parents, parent); |
| } else { |
| ((ContainerDefinition) parent).addWidgetDefinition(definition); |
| } |
| } |
| parents.remove(parents.size() - 1); |
| resolving = false; |
| } |
| |
| public Widget createInstance() { |
| return null; |
| } |
| } |