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1
29
30 package nextapp.echo2.app.componentxml;
31
32 import java.util.HashMap  ;
33 import java.util.Map ;
34
35 import nextapp.echo2.app.MutableStyle;
36 import nextapp.echo2.app.Style;
37 import nextapp.echo2.app.util.DomUtil;
38 import nextapp.echo2.app.util.PeerFactory;
39
40 import org.w3c.dom.Element ;
41
42
46 public class PropertyLoader {
47
48 private static final String PROPERTY_XML_PEERS_PATH = "META-INF/nextapp/echo2/PropertyXmlPeers.properties";
49
50
53 private static final Map classLoaderToPropertyLoaderMap = new HashMap ();
54
55
62 public static PropertyLoader forClassLoader(ClassLoader classLoader) {
63 synchronized(classLoaderToPropertyLoaderMap) {
64 PropertyLoader propertyLoader = (PropertyLoader) classLoaderToPropertyLoaderMap.get(classLoader);
65 if (propertyLoader == null) {
66 propertyLoader = new PropertyLoader(classLoader);
67 classLoaderToPropertyLoaderMap.put(classLoader, propertyLoader);
68 }
69 return propertyLoader;
70 }
71 }
72
73 private ClassLoader classLoader;
74 private PeerFactory propertyXmlPeerFactory;
75
76
82 private PropertyLoader(ClassLoader classLoader) {
83 super();
84 this.classLoader = classLoader;
85 propertyXmlPeerFactory = new PeerFactory(PROPERTY_XML_PEERS_PATH, classLoader);
86 }
87
88
98 public Style createStyle(Element propertiesElement, String type)
99 throws ComponentXmlException {
100 MutableStyle propertyStyle = new MutableStyle();
101
102 if (propertiesElement == null) {
103 return new MutableStyle();
105 }
106
107 ComponentIntrospector ci;
108 try {
109 ci = ComponentIntrospector.forName(type, classLoader);
110 } catch (ClassNotFoundException ex) {
111 throw new ComponentXmlException("Unable to introspect component: " + type, ex);
112 }
113
114 Element [] propertyElements = DomUtil.getChildElementsByTagName(propertiesElement, "property");
115 for (int i = 0; i < propertyElements.length; ++i) {
116 String propertyName = propertyElements[i].getAttribute("name");
117 Class propertyClass;
118 if (propertyElements[i].hasAttribute("type")) {
119 try {
120 propertyClass = Class.forName(propertyElements[i].getAttribute("type"));
121 } catch (ClassNotFoundException ex) {
122 throw new ComponentXmlException("Custom property class not found: "
123 + propertyElements[i].getAttribute("type"), ex);
124 }
125 } else {
126 propertyClass = ci.getPropertyClass(propertyName);
127 }
128
129 if (propertyClass == null) {
130 throw new ComponentXmlException("Property does not exist: " + propertyName, null);
131 }
132
133 Object propertyValue = getPropertyValue(ci.getObjectClass(), propertyClass, propertyElements[i]);
134
135 if (ci.isIndexedProperty(propertyName)) {
136 try {
137 int index = Integer.parseInt(propertyElements[i].getAttribute("index"));
138 propertyStyle.setIndexedProperty(propertyName, index, propertyValue);
139 } catch (NumberFormatException ex) {
140 throw new ComponentXmlException("Index not set.", ex);
141 }
142 } else {
143 propertyStyle.setProperty(propertyName, propertyValue);
144 }
145 }
146
147 return propertyStyle;
148 }
149
150
159 public Object getPropertyValue(Class objectClass, Class propertyClass, Element propertyElement)
160 throws InvalidPropertyException {
161 PropertyXmlPeer propertyXmlPeer
162 = (PropertyXmlPeer) propertyXmlPeerFactory.getPeerForObject(propertyClass, false);
163 if (propertyXmlPeer == null) {
164 throw new InvalidPropertyException("Peer not found for property class: " + propertyClass, null);
165 }
166 Object propertyValue = propertyXmlPeer.getValue(classLoader, objectClass, propertyElement);
167 return propertyValue;
168 }
169
170
176 public PropertyXmlPeer getPropertyXmlPeer(Class propertyClass) {
177 return (PropertyXmlPeer) propertyXmlPeerFactory.getPeerForObject(propertyClass, false);
178 }
179 }
180 |
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