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1
17 package org.apache.forrest.locationmap;
18
19 import java.io.IOException  ;
20 import java.util.Collections ;
21 import java.util.Iterator ;
22 import java.util.Map ;
23
24 import org.apache.forrest.locationmap.lm.LocationMap;
25 import org.apache.avalon.framework.activity.Disposable;
26 import org.apache.avalon.framework.configuration.Configurable;
27 import org.apache.avalon.framework.configuration.Configuration;
28 import org.apache.avalon.framework.configuration.ConfigurationException;
29 import org.apache.avalon.framework.configuration.NamespacedSAXConfigurationHandler;
30 import org.apache.avalon.framework.logger.AbstractLogEnabled;
31 import org.apache.avalon.framework.service.ServiceException;
32 import org.apache.avalon.framework.service.ServiceManager;
33 import org.apache.avalon.framework.service.Serviceable;
34 import org.apache.avalon.framework.thread.ThreadSafe;
35 import org.apache.cocoon.components.modules.input.InputModule;
36 import org.apache.excalibur.source.Source;
37 import org.apache.excalibur.source.SourceResolver;
38 import org.apache.excalibur.source.SourceValidity;
39 import org.apache.excalibur.xml.sax.SAXParser;
40 import org.xml.sax.InputSource ;
41 import org.xml.sax.SAXException ;
42
43
46 public class LocationMapModule extends AbstractLogEnabled
47 implements InputModule, Serviceable, Configurable, Disposable, ThreadSafe {
48
49 private static final Iterator ATTNAMES = Collections.EMPTY_LIST.iterator();
50
51 private ServiceManager m_manager;
52 private SourceResolver m_resolver;
53 private String m_src;
54 private SourceValidity m_srcVal;
55 private LocationMap m_lm;
56
57
59 public LocationMapModule() {
60 }
61
62 public void service(ServiceManager manager) throws ServiceException {
63 m_manager = manager;
64 m_resolver = (SourceResolver) manager.lookup(SourceResolver.ROLE);
65 }
66
67 public void configure(Configuration configuration) throws ConfigurationException {
68 m_src = configuration.getChild("file").getAttribute("src");
69 }
70
71 public void dispose() {
72 m_lm.dispose();
73 }
74
75 private LocationMap getLocationMap() throws Exception {
76 Source source = null;
77 try {
78 source = m_resolver.resolveURI(m_src);
79 if (m_lm == null) {
80 synchronized (this) {
81 if (m_lm == null) {
82 if (getLogger().isDebugEnabled()) {
83 getLogger().debug("loading location map at " + m_src);
84 }
85 m_srcVal = source.getValidity();
86 m_lm = new LocationMap(m_manager);
87 m_lm.enableLogging(getLogger());
88 m_lm.build(loadConfiguration(source));
89 }
90 }
91 }
92 else {
93 SourceValidity valid = source.getValidity();
94 if (m_srcVal != null && m_srcVal.isValid(valid) != 1) {
95 synchronized (this) {
96 if (m_srcVal != null && m_srcVal.isValid(valid) != 1) {
97 if (getLogger().isDebugEnabled()) {
98 getLogger().debug("reloading location map at " + m_src);
99 }
100 m_srcVal = valid;
101 m_lm.dispose();
102 m_lm = new LocationMap(m_manager);
103 m_lm.enableLogging(getLogger());
104 m_lm.build(loadConfiguration(source));
105 }
106 }
107 }
108 }
109 }
110 finally {
111 if (source != null) {
112 m_resolver.release(source);
113 }
114 }
115 return m_lm;
116 }
117
118 private Configuration loadConfiguration(Source source) throws ConfigurationException {
119 Configuration configuration = null;
120 SAXParser parser = null;
121 try {
122 parser = (SAXParser) m_manager.lookup(SAXParser.ROLE);
123 NamespacedSAXConfigurationHandler handler =
124 new NamespacedSAXConfigurationHandler();
125 parser.parse(new InputSource (source.getInputStream()),handler);
126 configuration = handler.getConfiguration();
127 }
128 catch (IOException e) {
129 throw new ConfigurationException("Unable to build LocationMap.",e);
130 }
131 catch (SAXException e) {
132 throw new ConfigurationException("Unable to build LocationMap.",e);
133 }
134 catch (ServiceException e) {
135 throw new ConfigurationException("Unable to build LocationMap.",e);
136 }
137 finally {
138 if (parser != null) {
139 m_manager.release(parser);
140 }
141 }
142 return configuration;
143 }
144
145
147
151 public Object getAttribute(
152 final String name,
153 final Configuration modeConf,
154 final Map objectModel)
155 throws ConfigurationException {
156
157 try {
158 return getLocationMap().locate(name,objectModel);
159 }
160 catch (ConfigurationException e) {
161 throw e;
162 }
163 catch (Exception e) {
164 getLogger().error("Failure processing LocationMap.",e);
165 }
166 return null;
167 }
168
169
173 public Iterator getAttributeNames(Configuration modeConf, Map objectModel)
174 throws ConfigurationException {
175
176 return null;
177 }
178
179
182 public Object [] getAttributeValues(
183 String name,
184 Configuration modeConf,
185 Map objectModel)
186 throws ConfigurationException {
187
188 return new Object [] {getAttribute(name,modeConf,objectModel)};
189 }
190
191 }
192 |
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