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1
23
24 package org.apache.slide.extractor;
25
26 import org.apache.slide.util.conf.Configurable;
27 import org.apache.slide.util.conf.Configuration;
28 import org.apache.slide.util.conf.ConfigurationException;
29 import org.apache.slide.content.NodeRevisionDescriptors;
30 import org.apache.slide.content.NodeRevisionDescriptor;
31
32 import java.util.*;
33 import java.lang.reflect.Constructor  ;
34
35
38 public class ExtractorManager implements Configurable {
39 private final static ExtractorManager manager = new ExtractorManager();
40
41 private List extractors = new ArrayList();
42
43 private ExtractorManager() {}
44
45 public static ExtractorManager getInstance() {
46 return manager;
47 }
48
49 public void addExtractor(Extractor extractor) {
50 extractors.add(extractor);
51 }
52
53 public PropertyExtractor[] getPropertyExtractors(String namespace, NodeRevisionDescriptors descriptors, NodeRevisionDescriptor descriptor) {
54 List matchingExtractors = new ArrayList();
55 for ( Iterator i = extractors.iterator(); i.hasNext(); ) {
56 Extractor extractor = (Extractor)i.next();
57 if ( extractor instanceof PropertyExtractor && matches(extractor, namespace, descriptors, descriptor)) {
58 matchingExtractors.add(extractor);
59 }
60 }
61 PropertyExtractor[] extractors = new PropertyExtractor[matchingExtractors.size()];
62 return (PropertyExtractor [])matchingExtractors.toArray(extractors);
63 };
64
65 public ContentExtractor[] getContentExtractors(String namespace, NodeRevisionDescriptors descriptors, NodeRevisionDescriptor descriptor) {
66 List matchingExtractors = new ArrayList();
67 for ( Iterator i = extractors.iterator(); i.hasNext(); ) {
68 Extractor extractor = (Extractor)i.next();
69 if ( extractor instanceof ContentExtractor && matches(extractor, namespace, descriptors, descriptor)) {
70 matchingExtractors.add(extractor);
71 }
72 }
73 ContentExtractor[] extractors = new ContentExtractor[matchingExtractors.size()];
74 return (ContentExtractor [])matchingExtractors.toArray(extractors);
75 };
76
77 public Extractor[] getExtractors(String namespace, NodeRevisionDescriptors descriptors, NodeRevisionDescriptor descriptor) {
78 List matchingExtractors = new ArrayList();
79 for ( Iterator i = extractors.iterator(); i.hasNext(); ) {
80 Extractor extractor = (Extractor)i.next();
81 if ( matches(extractor, namespace, descriptors, descriptor)) {
82 matchingExtractors.add(extractor);
83 }
84 }
85 Extractor[] extractors = new Extractor[matchingExtractors.size()];
86 return (Extractor [])matchingExtractors.toArray(extractors);
87 };
88
89 public boolean matches(Extractor extractor, String namespace, NodeRevisionDescriptors descriptors, NodeRevisionDescriptor descriptor) {
90 boolean matching = true;
91 if ( descriptor != null && extractor.getContentType() != null && !descriptor.getContentType().equals(extractor.getContentType()) ) {
92 matching = false;
93 }
94 if ( descriptors != null && extractor.getUri() != null && !descriptors.getUri().startsWith(extractor.getUri()) ) {
95 matching = false;
96 }
97 if ( descriptors != null && extractor.getNamespace() != null && !extractor.getNamespace().equals(namespace)) {
98 matching = false;
99 }
100 return matching;
101 }
102
103 public void configure(Configuration config) throws ConfigurationException {
104 Enumeration extractorConfigs = config.getConfigurations("extractor");
105 while (extractorConfigs.hasMoreElements()) {
106 Configuration extractorConfig = (Configuration)extractorConfigs.nextElement();
107 String classname = extractorConfig.getAttribute("classname");
108 String uri = extractorConfig.getAttribute("uri", null);
109 String contentType = extractorConfig.getAttribute("content-type", null);
110 String namespace = extractorConfig.getAttribute("namespace", null);
111 try {
112 Class extractorClass = Class.forName(classname);
113 Extractor extractor = null;
114 try {
115 Constructor extractorConstructor = extractorClass.getConstructor(new Class [] { String .class, String .class, String .class } );
116 extractor = (Extractor) extractorConstructor.newInstance(new String [] { uri, contentType, namespace });
117 }
118 catch (NoSuchMethodException e) {
119 Constructor extractorConstructor = extractorClass.getConstructor(new Class [] { String .class, String .class } );
120 extractor = (Extractor) extractorConstructor.newInstance(new String [] { uri, contentType });
121 }
122 if ( extractor instanceof Configurable ) {
123 ((Configurable)extractor).configure(extractorConfig.getConfiguration("configuration"));
124 }
125 addExtractor(extractor);
126 } catch (ClassCastException e) {
127 throw new ConfigurationException("Extractor '"+classname+"' is not of type Extractor", config);
128 } catch (ConfigurationException e) {
129 throw e;
130 } catch (Exception e) {
131 throw new ConfigurationException("Extractor '"+classname+"' could not be loaded", config);
132 }
133 }
134 }
135 } |
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