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17 package org.apache.geronimo.kernel.config.xstream;
18
19 import java.io.IOException  ;
20 import java.util.ArrayList ;
21 import java.util.Arrays ;
22 import java.util.Collection ;
23 import java.util.Collections ;
24 import java.util.List ;
25 import javax.xml.parsers.DocumentBuilder ;
26 import javax.xml.parsers.DocumentBuilderFactory ;
27 import javax.xml.parsers.ParserConfigurationException ;
28
29 import com.thoughtworks.xstream.XStream;
30 import com.thoughtworks.xstream.io.xml.DomReader;
31 import com.thoughtworks.xstream.io.xml.DomWriter;
32 import org.apache.geronimo.gbean.AbstractName;
33 import org.apache.geronimo.gbean.GBeanData;
34 import org.apache.geronimo.gbean.GBeanInfo;
35 import org.apache.geronimo.kernel.Naming;
36 import org.apache.geronimo.kernel.util.XmlUtil;
37 import org.apache.geronimo.kernel.config.InvalidConfigException;
38 import org.apache.geronimo.kernel.config.GBeanState;
39 import org.apache.geronimo.kernel.repository.Environment;
40 import org.w3c.dom.Document ;
41 import org.w3c.dom.Element ;
42
43
46 public class XStreamGBeanState implements GBeanState {
47
50 private final List gbeans = new ArrayList ();
51
52
55 private Element gbeanState;
56
57 public XStreamGBeanState(Element gbeanState) {
58 this.gbeanState = gbeanState;
59 }
60
61 public XStreamGBeanState(Collection gbeans) {
62 if (gbeans != null){
63 this.gbeans.addAll(gbeans);
64 }
65 }
66
67 public Element getGBeanState() throws IOException {
68 if (gbeanState == null) {
69 gbeanState = XStreamGBeanState.storeGBeans(gbeans);
70 gbeans.clear();
71 }
72 return gbeanState;
73 }
74
75 public List getGBeans(ClassLoader classLoader) throws InvalidConfigException {
76 if (gbeanState == null) {
77 return Collections.unmodifiableList(gbeans);
78 }
79 gbeans.addAll(XStreamGBeanState.loadGBeans(gbeanState, classLoader));
80 return Collections.unmodifiableList(gbeans);
81 }
82
83 public void addGBean(GBeanData gbeanData) {
84 if (gbeanState != null) {
85 throw new IllegalStateException ("GBeans have been serialized, so no more GBeans can be added");
86 }
87
88 gbeans.add(gbeanData);
89 }
90
91 public GBeanData addGBean(String name, GBeanInfo gbeanInfo, Naming naming, Environment environment) {
92 if (gbeanState != null) {
93 throw new IllegalStateException ("GBeans have been serialized, so no more GBeans can be added");
94 }
95
96 String j2eeType = gbeanInfo.getJ2eeType();
97 if (j2eeType == null) j2eeType = "GBean";
98 AbstractName abstractName = naming.createRootName(environment.getConfigId(), name, j2eeType);
99 GBeanData gBeanData = new GBeanData(abstractName, gbeanInfo);
100 addGBean(gBeanData);
101 return gBeanData;
102 }
103
104 private static List loadGBeans(Element element, ClassLoader classLoader) throws InvalidConfigException {
105 if (element != null) {
106 ClassLoader oldCl = Thread.currentThread().getContextClassLoader();
108 try {
109 Thread.currentThread().setContextClassLoader(classLoader);
110
111 DomReader reader = new DomReader(element);
112 XStream xstream = XStreamUtil.createXStream();
113 xstream.setClassLoader(classLoader);
114 Object o = xstream.unmarshal(reader);
115 GBeanData[] gbeanDatas = (GBeanData[]) o;
116 return Arrays.asList(gbeanDatas);
117 } catch (Exception e) {
118 throw new InvalidConfigException("Unable to load gbeans", e);
119 } finally {
120 Thread.currentThread().setContextClassLoader(oldCl);
121 }
122 }
123 return Collections.EMPTY_LIST;
124 }
125
126 private static Element storeGBeans(List gbeans) throws IOException {
127 GBeanData[] gbeanDatas = (GBeanData[]) gbeans.toArray(new GBeanData[gbeans.size()]);
128
129 DocumentBuilderFactory documentBuilderFactory = XmlUtil.newDocumentBuilderFactory();
130 DocumentBuilder documentBuilder = null;
131 try {
132 documentBuilder = documentBuilderFactory.newDocumentBuilder();
133 } catch (ParserConfigurationException e) {
134 throw (IOException )new IOException ("Cannot instantiate " + Document .class.getName()).initCause(e);
135 }
136 Document document = documentBuilder.newDocument();
137 DomWriter writer = new DomWriter(document);
138
139 XStream xstream = XStreamUtil.createXStream();
140 xstream.marshal(gbeanDatas, writer);
141
142
146 return document.getDocumentElement();
147 }
148 }
149 |
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