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1
16 package org.apache.cocoon.forms.binding.library;
17
18 import org.apache.avalon.framework.CascadingException;
19 import org.apache.avalon.framework.activity.Disposable;
20 import org.apache.avalon.framework.activity.Initializable;
21 import org.apache.avalon.framework.configuration.Configurable;
22 import org.apache.avalon.framework.configuration.Configuration;
23 import org.apache.avalon.framework.configuration.ConfigurationException;
24 import org.apache.avalon.framework.logger.AbstractLogEnabled;
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.avalon.framework.thread.ThreadSafe;
29 import org.apache.cocoon.forms.CacheManager;
30 import org.apache.cocoon.forms.binding.JXPathBindingManager;
31 import org.apache.cocoon.forms.util.DomHelper;
32 import org.apache.excalibur.source.Source;
33 import org.apache.excalibur.source.SourceResolver;
34 import org.w3c.dom.Document  ;
35 import org.xml.sax.InputSource ;
36
37
41 public class LibraryManagerImpl extends AbstractLogEnabled implements LibraryManager, ThreadSafe, Serviceable,
42 Configurable, Initializable, Disposable {
43
44 protected static final String PREFIX = "CocoonFormBindingLibrary:";
45
46 private ServiceManager serviceManager;
47 private Configuration configuration;
48 private CacheManager cacheManager;
49
50 private JXPathBindingManager bindingManager;
51
52 public void configure(Configuration configuration) throws ConfigurationException {
53 this.configuration = configuration;
54 getLogger().debug("Gotten a config: top level element: "+this.configuration);
55 }
56
57 public void service(ServiceManager serviceManager) throws ServiceException {
58 this.serviceManager = serviceManager;
59 this.cacheManager = (CacheManager)serviceManager.lookup(CacheManager.ROLE);
60 }
61
62 public void setBindingManager(JXPathBindingManager bindingManager) {
63 this.bindingManager = bindingManager;
64 }
65
66 public void initialize() throws Exception {
67
68 }
70
71 public boolean libraryInCache(String librarysource) throws Exception {
72 return libraryInCache(librarysource,null);
73 }
74
75 public boolean libraryInCache(String librarysource, String relative) throws Exception {
76 SourceResolver sourceResolver = null;
77 Source source = null;
78
79 if(getLogger().isDebugEnabled())
80 getLogger().debug("Checking if library is in cache: '"+librarysource+"' relative to '"+relative+"'");
81
82 Library lib = null;
83 boolean result = false;
84
85 try {
86 sourceResolver = (SourceResolver)serviceManager.lookup(SourceResolver.ROLE);
87 source = sourceResolver.resolveURI(librarysource, relative, null);
88
89 lib = (Library)this.cacheManager.get(source, PREFIX);
90
91 if( lib != null && lib.dependenciesHaveChanged() ) {
92 result = false;
93 this.cacheManager.set(null,source,PREFIX); }
95 else if( lib == null )
96 result = false;
97 else
98 result = true;
99 } catch(Exception e) {
100 if(getLogger().isErrorEnabled())
101 getLogger().error("Problem getting library '"+librarysource+"' relative to '"+relative+"'!",e);
102 throw e;
103 } finally {
104 if (source != null)
105 sourceResolver.release(source);
106 if (sourceResolver != null)
107 serviceManager.release(sourceResolver);
108 }
109
110 if(getLogger().isDebugEnabled()) {
111 if(result)
112 getLogger().debug("Library IS in cache : '"+librarysource+"' relative to '"+relative+"'");
113 else
114 getLogger().debug("Library IS NOT in cache : '"+librarysource+"' relative to '"+relative+"'");
115 }
116
117 return result;
118 }
119
120 public Library getLibrary(String librarysource) throws Exception {
121 return getLibrary(librarysource,null);
122 }
123
124 public Library getLibrary(String librarysource, String relative) throws Exception {
125 SourceResolver sourceResolver = null;
126 Source source = null;
127 Document libraryDocument = null;
128
129 Library lib = null;
130
131 if(getLogger().isDebugEnabled())
132 getLogger().debug("Getting library instance: '"+librarysource+"' relative to '"+relative+"'");
133
134 try {
135 sourceResolver = (SourceResolver)serviceManager.lookup(SourceResolver.ROLE);
136 source = sourceResolver.resolveURI(librarysource, relative, null);
137
138 lib = (Library)this.cacheManager.get(source, PREFIX);
139
140 if( lib != null && lib.dependenciesHaveChanged() ) {
141 if(getLogger().isDebugEnabled())
142 getLogger().debug("Library dependencies changed, invalidating!");
143
144 lib = null;
145 }
146
147 if( lib == null ) {
148 if(getLogger().isDebugEnabled())
149 getLogger().debug("Library not in cache, creating!");
150
151 try {
152 InputSource inputSource = new InputSource (source.getInputStream());
153 inputSource.setSystemId(source.getURI());
154 libraryDocument = DomHelper.parse(inputSource, this.serviceManager);
155
156 lib = getNewLibrary();
157 lib.buildLibrary(libraryDocument.getDocumentElement());
158
159 this.cacheManager.set(lib,source,PREFIX);
160
161 } catch (Exception e) {
162 throw new CascadingException("Could not parse form definition from " +
163 source.getURI(), e);
164 }
165 }
166 } finally {
167 if (source != null)
168 sourceResolver.release(source);
169 if (sourceResolver != null)
170 serviceManager.release(sourceResolver);
171 }
172
173 return lib;
174 }
175
176 public Library getNewLibrary() {
177 Library lib = new Library(this);
178 lib.setAssistant(this.bindingManager.getBuilderAssistant());
179
180 if(getLogger().isDebugEnabled())
181 getLogger().debug("Created new library! "+lib);
182
183 return lib;
184 }
185
186 public void dispose() {
187 this.serviceManager.release(this.cacheManager);
188 this.cacheManager = null;
189 this.serviceManager = null;
190 }
191
192 public void debug(String msg) {
193 if(getLogger().isDebugEnabled()) {
194 getLogger().debug(msg);
195 }
196 }
197
198 }
199 |
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