/*
* Copyright 2004 Sun Microsystems, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package com.sun.syndication.io.impl;
import com.sun.syndication.feed.module.ModuleI;
import com.sun.syndication.io.ModuleParser;
import org.jdom.Element;
import org.jdom.Namespace;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
/**
*/
public class ModulesParser {
private Map _feedModuleParsers = new HashMap();
private Map _itemModuleParsers = new HashMap();
private void loadParsers(String defaultFile,String fileProperty,String key,Map map) {
PlugableClasses pClasses = new PlugableClasses(defaultFile,fileProperty,
key,true,ModulesParser.class.getClassLoader());
Object[] parsers;
try {
parsers = pClasses.createInstances();
}
catch (Exception ex) {
throw new RuntimeException(ex);
}
for (int i=0;i<parsers.length;i++) {
ModuleParser parser = (ModuleParser) parsers[i];
map.put(parser.getNamespaceUri(),parser);
}
}
public ModulesParser() {
this(Constants.DEFAULT_IMPLS_FILE,Constants.IMPLS_SYSTEM_PROPERTY);
}
public ModulesParser(String defaultFile,String fileProperty) {
loadParsers(defaultFile,fileProperty,Constants.FEED_MODULE_PARSERS_KEY,_feedModuleParsers);
loadParsers(defaultFile,fileProperty,Constants.ITEM_MODULE_PARSERS_KEY,_itemModuleParsers);
}
public List getFeedModuleNamespaces() {
return Collections.unmodifiableList(new ArrayList(_feedModuleParsers.keySet()));
}
public List getItemModuleNamespaces() {
return Collections.unmodifiableList(new ArrayList(_itemModuleParsers.keySet()));
}
public List parseFeedModules(Element root) {
return parseModules(_feedModuleParsers,root);
}
public List parseItemModules(Element root) {
return parseModules(_itemModuleParsers,root);
}
private boolean hasElementsFrom(Element root,Namespace namespace) {
boolean itHas = false;
List children = root.getChildren();
for (int i=0;!itHas && i<children.size();i++) {
Element child = (Element) children.get(i);
itHas = namespace.equals(child.getNamespace());
}
return itHas;
}
private List parseModules(Map parsers,Element root) {
List modules = null;
Iterator i = parsers.keySet().iterator();
while (i.hasNext()) {
String namespaceURI = (String) i.next();
Namespace namespace = Namespace.getNamespace(namespaceURI);
if (hasElementsFrom(root,namespace)) {
ModuleParser parser = (ModuleParser) parsers.get(namespaceURI);
if (parser!=null) {
ModuleI module = parser.parse(root);
if (module!=null) {
if (modules==null) {
modules = new ArrayList();
}
modules.add(module);
}
}
}
}
return modules;
}
}