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17 package com.sun.syndication.io.impl;
18
19 import com.sun.syndication.util.PlugableClasses;
20 import com.sun.syndication.feed.module.ModuleI;
21 import com.sun.syndication.io.ModuleParser;
22 import org.jdom.Element;
23 import org.jdom.Namespace;
24
25 import java.util.ArrayList;
26 import java.util.Collections;
27 import java.util.HashMap;
28 import java.util.Iterator;
29 import java.util.List;
30 import java.util.Map;
31
32 /***
33 */
34 public class ModulesParser {
35 private Map _feedModuleParsers = new HashMap();
36 private Map _itemModuleParsers = new HashMap();
37
38 private void loadParsers(String defaultFile,String fileProperty,String key,Map map) {
39 PlugableClasses pClasses = new PlugableClasses(defaultFile,fileProperty,
40 key,true,ModulesParser.class.getClassLoader());
41 Object[] parsers;
42 try {
43 parsers = pClasses.createInstances();
44 }
45 catch (Exception ex) {
46 throw new RuntimeException(ex);
47 }
48 for (int i=0;i<parsers.length;i++) {
49 ModuleParser parser = (ModuleParser) parsers[i];
50 map.put(parser.getNamespaceUri(),parser);
51 }
52 }
53
54 public ModulesParser() {
55 this(Constants.DEFAULT_IMPLS_FILE,Constants.IMPLS_SYSTEM_PROPERTY);
56 }
57
58 public ModulesParser(String defaultFile,String fileProperty) {
59 loadParsers(defaultFile,fileProperty,Constants.FEED_MODULE_PARSERS_KEY,_feedModuleParsers);
60 loadParsers(defaultFile,fileProperty,Constants.ITEM_MODULE_PARSERS_KEY,_itemModuleParsers);
61 }
62
63 public List getFeedModuleNamespaces() {
64 return Collections.unmodifiableList(new ArrayList(_feedModuleParsers.keySet()));
65 }
66
67 public List getItemModuleNamespaces() {
68 return Collections.unmodifiableList(new ArrayList(_itemModuleParsers.keySet()));
69 }
70
71 public List parseFeedModules(Element root) {
72 return parseModules(_feedModuleParsers,root);
73 }
74
75 public List parseItemModules(Element root) {
76 return parseModules(_itemModuleParsers,root);
77 }
78
79
80 private boolean hasElementsFrom(Element root,Namespace namespace) {
81 boolean itHas = false;
82 List children = root.getChildren();
83 for (int i=0;!itHas && i<children.size();i++) {
84 Element child = (Element) children.get(i);
85 itHas = namespace.equals(child.getNamespace());
86 }
87 return itHas;
88 }
89
90 private List parseModules(Map parsers,Element root) {
91 List modules = null;
92 Iterator i = parsers.keySet().iterator();
93 while (i.hasNext()) {
94 String namespaceURI = (String) i.next();
95 Namespace namespace = Namespace.getNamespace(namespaceURI);
96 if (hasElementsFrom(root,namespace)) {
97 ModuleParser parser = (ModuleParser) parsers.get(namespaceURI);
98 if (parser!=null) {
99 ModuleI module = parser.parse(root);
100 if (module!=null) {
101 if (modules==null) {
102 modules = new ArrayList();
103 }
104 modules.add(module);
105 }
106 }
107 }
108 }
109 return modules;
110 }
111
112 }