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16 package org.apache.cocoon.woody.formmodel;
17
18 import java.util.ArrayList  ;
19 import java.util.Collections ;
20 import java.util.HashMap ;
21 import java.util.List ;
22 import java.util.Map ;
23
24 import org.apache.avalon.framework.CascadingException;
25 import org.apache.avalon.framework.activity.Disposable;
26 import org.apache.avalon.framework.service.ServiceException;
27 import org.apache.avalon.framework.service.ServiceManager;
28 import org.apache.avalon.framework.service.ServiceSelector;
29 import org.apache.avalon.framework.service.Serviceable;
30 import org.apache.cocoon.woody.Constants;
31 import org.apache.cocoon.woody.datatype.DatatypeManager;
32 import org.apache.cocoon.woody.event.WidgetListener;
33 import org.apache.cocoon.woody.event.WidgetListenerBuilderUtil;
34 import org.apache.cocoon.woody.expression.ExpressionManager;
35 import org.apache.cocoon.woody.util.DomHelper;
36 import org.apache.cocoon.woody.validation.WidgetValidatorBuilder;
37 import org.apache.excalibur.xml.sax.XMLizable;
38 import org.w3c.dom.Element ;
39 import org.w3c.dom.Node ;
40 import org.w3c.dom.NodeList ;
41
42
48 public abstract class AbstractWidgetDefinitionBuilder implements WidgetDefinitionBuilder, Serviceable, Disposable {
49 protected ServiceSelector widgetDefinitionBuilderSelector;
50 protected ServiceSelector widgetValidatorBuilderSelector;
51 protected DatatypeManager datatypeManager;
52 protected ExpressionManager expressionManager;
53 protected ServiceManager serviceManager;
54
55 public void service(ServiceManager serviceManager) throws ServiceException {
56 this.serviceManager = serviceManager;
57 this.widgetDefinitionBuilderSelector = (ServiceSelector) serviceManager.lookup(WidgetDefinitionBuilder.class.getName() + "Selector");
58 this.datatypeManager = (DatatypeManager) serviceManager.lookup(DatatypeManager.ROLE);
59 this.expressionManager = (ExpressionManager) serviceManager.lookup(ExpressionManager.ROLE);
60 this.widgetValidatorBuilderSelector = (ServiceSelector) serviceManager.lookup(WidgetValidatorBuilder.ROLE + "Selector");
61 }
62
63 protected void setLocation(Element widgetElement, AbstractWidgetDefinition widgetDefinition) {
64 widgetDefinition.setLocation(DomHelper.getLocation(widgetElement));
65 }
66
67 protected void setId(Element widgetElement, AbstractWidgetDefinition widgetDefinition) throws Exception {
68 String id = DomHelper.getAttribute(widgetElement, "id");
69 if (id.length() < 1) {
70 throw new Exception ("Missing id attribute on element '" + widgetElement.getTagName() + "' at " +
71 DomHelper.getLocation(widgetElement));
72 }
73 widgetDefinition.setId(id);
74 }
75
76 protected WidgetDefinition buildAnotherWidgetDefinition(Element widgetDefinition) throws Exception {
77 String widgetName = widgetDefinition.getLocalName();
78 WidgetDefinitionBuilder builder = null;
79 try {
80 builder = (WidgetDefinitionBuilder)widgetDefinitionBuilderSelector.select(widgetName);
81 } catch (ServiceException e) {
82 throw new CascadingException("Unknown kind of widget '" + widgetName + "' at " +
83 DomHelper.getLocation(widgetDefinition), e);
84 }
85 return builder.buildWidgetDefinition(widgetDefinition);
86 }
87
88 protected List buildEventListeners(Element widgetElement, String elementName, Class listenerClass) throws Exception {
89 List result = null;
90 Element listenerElement = DomHelper.getChildElement(widgetElement, Constants.WD_NS, elementName);
91 if (listenerElement != null) {
92 NodeList list = listenerElement.getChildNodes();
93 for (int i = 0; i < list.getLength(); i++) {
94 if (list.item(i).getNodeType() == Node.ELEMENT_NODE) {
95 WidgetListener listener = WidgetListenerBuilderUtil.getWidgetListener((Element )list.item(i), listenerClass);
96 if (result == null) result = new ArrayList ();
97 result.add(listener);
98 }
99 }
100 }
101
102 return result == null ? Collections.EMPTY_LIST : result;
103 }
104
105 protected void setDisplayData(Element widgetElement, AbstractWidgetDefinition widgetDefinition) throws Exception {
106 final String [] names = {"label", "help", "hint"};
107 Map displayData = new HashMap (names.length);
108 for (int i = 0; i < names.length; i++) {
109 XMLizable data = null;
110 Element dataElement = DomHelper.getChildElement(widgetElement, Constants.WD_NS, names[i]);
111 if (dataElement != null) {
112 data = DomHelper.compileElementContent(dataElement);
113 }
114
115 displayData.put(names[i], data);
118 }
119
120 widgetDefinition.setDisplayData(displayData);
121 }
122
123 protected void setValidators(Element widgetElement, AbstractWidgetDefinition widgetDefinition) throws Exception {
124 Element validatorElement = DomHelper.getChildElement(widgetElement, Constants.WD_NS, "validation");
125 if (validatorElement != null) {
126 NodeList list = validatorElement.getChildNodes();
127 for (int i = 0; i < list.getLength(); i++) {
128 if (list.item(i).getNodeType() == Node.ELEMENT_NODE) {
129 Element element = (Element )list.item(i);
130 String name = element.getLocalName();
131 WidgetValidatorBuilder builder;
132 try {
133 builder = (WidgetValidatorBuilder)this.widgetValidatorBuilderSelector.select(name);
134 } catch(ServiceException e) {
135 throw new CascadingException("Unknow kind of validator '" + name + "' at " +
136 DomHelper.getLocation(element), e);
137 }
138
139 widgetDefinition.addValidator(builder.build(element, widgetDefinition));
140 }
141 }
142 }
143 }
144
145 public void dispose() {
146 this.serviceManager.release(this.widgetDefinitionBuilderSelector);
147 this.widgetDefinitionBuilderSelector = null;
148 this.serviceManager.release(this.datatypeManager);
149 this.datatypeManager = null;
150 this.serviceManager.release(this.expressionManager);
151 this.expressionManager = null;
152 this.serviceManager.release(this.widgetValidatorBuilderSelector);
153 this.widgetValidatorBuilderSelector = null;
154 this.serviceManager = null;
155 }
156 }
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