| /* |
| * 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.datatype; |
| |
| import org.w3c.dom.Document; |
| import org.w3c.dom.Element; |
| import org.w3c.dom.NodeList; |
| import org.w3c.dom.Node; |
| import org.apache.avalon.framework.service.ServiceException; |
| import org.apache.avalon.framework.service.ServiceManager; |
| import org.apache.avalon.framework.service.Serviceable; |
| import org.apache.cocoon.woody.Constants; |
| import org.apache.cocoon.woody.datatype.convertor.Convertor; |
| import org.apache.cocoon.woody.datatype.convertor.DefaultFormatCache; |
| import org.apache.cocoon.woody.util.DomHelper; |
| import org.apache.excalibur.source.Source; |
| import org.apache.excalibur.source.SourceResolver; |
| import org.apache.excalibur.xml.sax.XMLizable; |
| import org.xml.sax.InputSource; |
| import org.xml.sax.SAXException; |
| |
| import java.util.Locale; |
| |
| /** |
| * Builds {@link SelectionList}s from an XML description or an URL. |
| * |
| * <p>Note: the class {@link DynamicSelectionList} also interprets the same wd:selection-list XML, so if |
| * anything changes here to how that XML is interpreted, it also needs to change over there and vice versa. |
| * |
| * @version CVS $Id: DefaultSelectionListBuilder.java,v 1.4 2004/03/05 13:02:28 bdelacretaz Exp $ |
| */ |
| public class DefaultSelectionListBuilder implements SelectionListBuilder, Serviceable { |
| |
| private ServiceManager serviceManager; |
| |
| public void service(ServiceManager manager) throws ServiceException { |
| this.serviceManager = manager; |
| } |
| |
| public SelectionList build(Element selectionListElement, Datatype datatype) throws Exception { |
| SelectionList selectionList; |
| String src = selectionListElement.getAttribute("src"); |
| if (src.length() > 0) { |
| boolean dynamic = DomHelper.getAttributeAsBoolean(selectionListElement, "dynamic", false); |
| if (!dynamic) { |
| selectionListElement = readSelectionList(src); |
| selectionList = buildStaticList(selectionListElement, datatype); |
| } else { |
| selectionList = new DynamicSelectionList(datatype, src, serviceManager); |
| } |
| } else { |
| // selection list is defined inline |
| selectionList = buildStaticList(selectionListElement, datatype); |
| } |
| |
| return selectionList; |
| } |
| |
| private SelectionList buildStaticList(Element selectionListElement, Datatype datatype) throws Exception { |
| StaticSelectionList selectionList = new StaticSelectionList(datatype); |
| Convertor convertor = null; |
| Convertor.FormatCache formatCache = new DefaultFormatCache(); |
| |
| NodeList children = selectionListElement.getChildNodes(); |
| for (int i = 0; children.item(i) != null; i++) { |
| Node node = children.item(i); |
| if (convertor == null && node instanceof Element && Constants.WD_NS.equals(node.getNamespaceURI()) && "convertor".equals(node.getLocalName())) { |
| Element convertorConfigElement = (Element)node; |
| try { |
| convertor = datatype.getBuilder().buildConvertor(convertorConfigElement); |
| } catch (Exception e) { |
| throw new SAXException("Error building convertor from convertor configuration embedded in selection list XML.", e); |
| } |
| } else if (node instanceof Element && Constants.WD_NS.equals(node.getNamespaceURI()) && "item".equals(node.getLocalName())) { |
| if (convertor == null) { |
| convertor = datatype.getConvertor(); |
| } |
| Element element = (Element)node; |
| String stringValue = element.getAttribute("value"); |
| Object value; |
| if ("".equals(stringValue)) { |
| // Empty value translates into the null object |
| value = null; |
| } else { |
| value = convertor.convertFromString(stringValue, Locale.US, formatCache); |
| if (value == null) { |
| throw new Exception("Could not convert the value \"" + stringValue + |
| "\" to the type " + datatype.getDescriptiveName() + |
| ", defined at " + DomHelper.getLocation(element)); |
| } |
| } |
| |
| XMLizable label = null; |
| Element labelEl = DomHelper.getChildElement(element, Constants.WD_NS, "label"); |
| if (labelEl != null) { |
| label = DomHelper.compileElementContent(labelEl); |
| } |
| selectionList.addItem(value, label); |
| } |
| } |
| |
| return selectionList; |
| } |
| |
| private Element readSelectionList(String src) throws Exception { |
| SourceResolver resolver = null; |
| Source source = null; |
| try { |
| resolver = (SourceResolver)serviceManager.lookup(SourceResolver.ROLE); |
| source = resolver.resolveURI(src); |
| InputSource inputSource = new InputSource(source.getInputStream()); |
| inputSource.setSystemId(source.getURI()); |
| Document document = DomHelper.parse(inputSource); |
| Element selectionListElement = document.getDocumentElement(); |
| if (!Constants.WD_NS.equals(selectionListElement.getNamespaceURI()) || !"selection-list".equals(selectionListElement.getLocalName())) |
| throw new Exception("Excepted a wd:selection-list element at " + DomHelper.getLocation(selectionListElement)); |
| return selectionListElement; |
| } finally { |
| if (source != null) |
| resolver.release(source); |
| if (resolver != null) |
| serviceManager.release(resolver); |
| } |
| } |
| } |