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16 package org.apache.cocoon.forms.datatype;
17
18 import org.w3c.dom.Document  ;
19 import org.w3c.dom.Element ;
20 import org.w3c.dom.NodeList ;
21 import org.w3c.dom.Node ;
22 import org.apache.avalon.framework.context.Context;
23 import org.apache.avalon.framework.context.ContextException;
24 import org.apache.avalon.framework.context.Contextualizable;
25 import org.apache.avalon.framework.service.ServiceException;
26 import org.apache.avalon.framework.service.ServiceManager;
27 import org.apache.avalon.framework.service.Serviceable;
28 import org.apache.cocoon.forms.FormsConstants;
29 import org.apache.cocoon.forms.datatype.convertor.Convertor;
30 import org.apache.cocoon.forms.datatype.convertor.DefaultFormatCache;
31 import org.apache.cocoon.forms.datatype.convertor.ConversionResult;
32 import org.apache.cocoon.forms.util.DomHelper;
33 import org.apache.cocoon.util.Deprecation;
34 import org.apache.cocoon.util.location.LocationAttributes;
35 import org.apache.excalibur.source.Source;
36 import org.apache.excalibur.source.SourceResolver;
37 import org.apache.excalibur.xml.sax.XMLizable;
38 import org.xml.sax.InputSource ;
39 import org.xml.sax.SAXException ;
40
41 import java.util.Locale ;
42
43
53 public class DefaultSelectionListBuilder implements SelectionListBuilder, Serviceable, Contextualizable {
54
55 private ServiceManager serviceManager;
56 private Context context;
57
58 public void contextualize(Context context) throws ContextException {
59 this.context = context;
60 }
61
62 public void service(ServiceManager manager) throws ServiceException {
63 this.serviceManager = manager;
64 }
65
66 public SelectionList build(Element selectionListElement, Datatype datatype) throws Exception {
67 SelectionList selectionList;
68 String src = selectionListElement.getAttribute("src");
69 if (src.length() > 0) {
70 boolean dynamic = false;
71 boolean usePerRequestCache = false;
72 String cacheType = DomHelper.getAttribute(selectionListElement, "cache", null);
73
74 if ("request".equals(cacheType)) { dynamic = true;
77 usePerRequestCache = true;
78 } else if ("none".equals(cacheType)){ dynamic = true;
80 } else if ("static".equals(cacheType)) {
81 } else { if (DomHelper.getAttribute(selectionListElement, "dynamic", null) != null) {
84 Deprecation.logger.warn("'@dynamic' is deprecated in <fd:selection-list> and replaced by '@cache' at " + DomHelper.getLocation(selectionListElement));
85 }
86 dynamic = DomHelper.getAttributeAsBoolean(selectionListElement, "dynamic", false);
87 }
88 if (dynamic) {
90 selectionList = new DynamicSelectionList(datatype, src, usePerRequestCache, serviceManager, context);
91 } else {
92 selectionListElement = readSelectionList(src);
93 selectionList = buildStaticList(selectionListElement, datatype);
94 }
95 } else {
96 selectionList = buildStaticList(selectionListElement, datatype);
98 }
99 return selectionList;
100 }
101
102 private SelectionList buildStaticList(Element selectionListElement, Datatype datatype) throws Exception {
103 StaticSelectionList selectionList = new StaticSelectionList(datatype);
104 Convertor convertor = null;
105 Convertor.FormatCache formatCache = new DefaultFormatCache();
106
107 LocationAttributes.remove(selectionListElement, true);
109
110 NodeList children = selectionListElement.getChildNodes();
111 for (int i = 0; children.item(i) != null; i++) {
112 Node node = children.item(i);
113 if (convertor == null && node instanceof Element && FormsConstants.DEFINITION_NS.equals(node.getNamespaceURI()) && "convertor".equals(node.getLocalName())) {
114 Element convertorConfigElement = (Element )node;
115 try {
116 convertor = datatype.getBuilder().buildConvertor(convertorConfigElement);
117 } catch (Exception e) {
118 throw new SAXException ("Error building convertor from convertor configuration embedded in selection list XML.", e);
119 }
120 } else if (node instanceof Element && FormsConstants.DEFINITION_NS.equals(node.getNamespaceURI()) && "item".equals(node.getLocalName())) {
121 if (convertor == null) {
122 convertor = datatype.getConvertor();
123 }
124 Element element = (Element )node;
125 String stringValue = element.getAttribute("value");
126 Object value;
127 if ("".equals(stringValue)) {
128 value = null;
130 } else {
131 ConversionResult conversionResult = convertor.convertFromString(stringValue, Locale.US, formatCache);
132 if (!conversionResult.isSuccessful()) {
133 throw new Exception ("Could not convert the value \"" + stringValue +
134 "\" to the type " + datatype.getDescriptiveName() +
135 ", defined at " + DomHelper.getLocation(element));
136 }
137 value = conversionResult.getResult();
138 }
139
140 XMLizable label = null;
141 Element labelEl = DomHelper.getChildElement(element, FormsConstants.DEFINITION_NS, "label");
142 if (labelEl != null) {
143 label = DomHelper.compileElementContent(labelEl);
144 }
145 selectionList.addItem(value, label);
146 }
147 }
148
149 return selectionList;
150 }
151
152 private Element readSelectionList(String src) throws Exception {
153 SourceResolver resolver = null;
154 Source source = null;
155 try {
156 resolver = (SourceResolver)serviceManager.lookup(SourceResolver.ROLE);
157 source = resolver.resolveURI(src);
158 InputSource inputSource = new InputSource (source.getInputStream());
159 inputSource.setSystemId(source.getURI());
160 Document document = DomHelper.parse(inputSource, this.serviceManager);
161 Element selectionListElement = document.getDocumentElement();
162 if (!FormsConstants.DEFINITION_NS.equals(selectionListElement.getNamespaceURI()) ||
163 !"selection-list".equals(selectionListElement.getLocalName())) {
164 throw new Exception ("Expected a fd:selection-list element at " +
165 DomHelper.getLocation(selectionListElement));
166 }
167
168 return selectionListElement;
169 } finally {
170 if (resolver != null) {
171 if (source != null) {
172 resolver.release(source);
173 }
174 serviceManager.release(resolver);
175 }
176 }
177 }
178 }
179 |
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