Source Code Cross Referenced for Navigation.java in  » J2EE » Pustefix » de » schlund » pfixcore » workflow » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » Pustefix » de.schlund.pfixcore.workflow 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * This file is part of PFIXCORE.
003:         *
004:         * PFIXCORE is free software; you can redistribute it and/or modify
005:         * it under the terms of the GNU Lesser General Public License as published by
006:         * the Free Software Foundation; either version 2 of the License, or
007:         * (at your option) any later version.
008:         *
009:         * PFIXCORE is distributed in the hope that it will be useful,
010:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
011:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
012:         * GNU Lesser General Public License for more details.
013:         *
014:         * You should have received a copy of the GNU Lesser General Public License
015:         * along with PFIXCORE; if not, write to the Free Software
016:         * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
017:         *
018:         */
019:
020:        package de.schlund.pfixcore.workflow;
021:
022:        import java.io.IOException;
023:        import java.io.StringReader;
024:        import java.util.ArrayList;
025:        import java.util.HashMap;
026:        import java.util.HashSet;
027:        import java.util.List;
028:        import java.util.Map;
029:        import java.util.Set;
030:
031:        import javax.xml.transform.TransformerConfigurationException;
032:        import javax.xml.transform.TransformerException;
033:        import javax.xml.transform.TransformerFactory;
034:        import javax.xml.transform.dom.DOMResult;
035:        import javax.xml.transform.sax.SAXTransformerFactory;
036:        import javax.xml.transform.sax.TransformerHandler;
037:
038:        import org.w3c.dom.Document;
039:        import org.w3c.dom.Element;
040:        import org.w3c.dom.Node;
041:        import org.xml.sax.InputSource;
042:        import org.xml.sax.SAXException;
043:        import org.xml.sax.XMLReader;
044:        import org.xml.sax.helpers.DefaultHandler;
045:        import org.xml.sax.helpers.XMLReaderFactory;
046:
047:        import de.schlund.pfixxml.config.CustomizationHandler;
048:        import de.schlund.pfixxml.config.includes.FileIncludeEvent;
049:        import de.schlund.pfixxml.config.includes.FileIncludeEventListener;
050:        import de.schlund.pfixxml.config.includes.IncludesResolver;
051:        import de.schlund.pfixxml.resources.FileResource;
052:        import de.schlund.pfixxml.util.TransformerHandlerAdapter;
053:        import de.schlund.pfixxml.util.XPath;
054:        import de.schlund.pfixxml.util.Xml;
055:        import de.schlund.pfixxml.util.XsltVersion;
056:
057:        public class Navigation {
058:            private NavigationElement pageroot = new NavigationElement(
059:                    "__NONE__", "__NONE__");
060:            private Map<String, NavigationElement> pagetonavi;
061:
062:            private Set<FileResource> fileDependencies = new HashSet<FileResource>();
063:            private long loadTime = 0;
064:
065:            private Element navigationXMLElement = null;
066:
067:            public Navigation(FileResource navifile, XsltVersion xsltVersion)
068:                    throws IOException, SAXException, TransformerException,
069:                    TransformerConfigurationException {
070:                loadTime = System.currentTimeMillis();
071:                Document navitree = Xml.parseMutable(navifile);
072:
073:                IncludesResolver iresolver = new IncludesResolver(null,
074:                        "config-include");
075:                // Make sure list of dependencies only contains the file itself
076:                fileDependencies.clear();
077:                fileDependencies.add(navifile);
078:                FileIncludeEventListener listener = new FileIncludeEventListener() {
079:
080:                    public void fileIncluded(FileIncludeEvent event) {
081:                        fileDependencies.add(event.getIncludedFile());
082:                    }
083:
084:                };
085:                iresolver.registerListener(listener);
086:                iresolver.resolveIncludes(navitree);
087:
088:                TransformerFactory tf = TransformerFactory.newInstance();
089:                if (tf.getFeature(SAXTransformerFactory.FEATURE)) {
090:                    SAXTransformerFactory stf = (SAXTransformerFactory) tf;
091:                    TransformerHandler th = stf.newTransformerHandler();
092:                    DOMResult dr = new DOMResult();
093:                    th.setResult(dr);
094:                    DefaultHandler dh = new TransformerHandlerAdapter(th);
095:                    DefaultHandler ch = new CustomizationHandler(dh);
096:                    XMLReader xreader = XMLReaderFactory.createXMLReader();
097:                    xreader.setContentHandler(ch);
098:                    xreader.setDTDHandler(ch);
099:                    xreader.setEntityResolver(ch);
100:                    xreader.setErrorHandler(ch);
101:                    xreader.parse(new InputSource(new StringReader(Xml
102:                            .serialize(navitree, false, true))));
103:                    navitree = dr.getNode().getOwnerDocument();
104:                    if (navitree == null) {
105:                        if (dr.getNode() instanceof  Document) {
106:                            navitree = (Document) dr.getNode();
107:                        } else {
108:                            throw new RuntimeException(
109:                                    "XML result is not a Document though it should be");
110:                        }
111:                    }
112:                } else {
113:                    throw new RuntimeException(
114:                            "TransformerFactory instance does not provide SAXTransformerFactory!");
115:                }
116:
117:                // We need a Saxon node here
118:                navigationXMLElement = (Element) XPath.selectOne(Xml.parse(
119:                        xsltVersion, navitree), "/make/navigation");
120:
121:                List<Node> nl = XPath.select(navitree, "/make/navigation/page");
122:                pagetonavi = new HashMap<String, NavigationElement>();
123:                recursePagetree(pageroot, nl);
124:            }
125:
126:            public boolean needsReload() {
127:                for (FileResource file : fileDependencies) {
128:                    long lastModified = file.lastModified();
129:                    if (lastModified > loadTime) {
130:                        return true;
131:                    }
132:                }
133:                return false;
134:            }
135:
136:            public Element getNavigationXMLElement() {
137:                return navigationXMLElement;
138:            }
139:
140:            private void recursePagetree(NavigationElement parent, List<Node> nl)
141:                    throws TransformerException {
142:                for (int i = 0; i < nl.size(); i++) {
143:                    Element page = (Element) nl.get(i);
144:                    String name = page.getAttribute("name");
145:                    String handler = page.getAttribute("handler");
146:
147:                    NavigationElement elem = new NavigationElement(name,
148:                            handler);
149:                    pagetonavi.put(name, elem);
150:                    parent.addChild(elem);
151:                    List<Node> tmp = XPath.select(page, "./page");
152:                    if (tmp.size() > 0) {
153:                        recursePagetree(elem, tmp);
154:                    }
155:                }
156:            }
157:
158:            public NavigationElement[] getNavigationElements() {
159:                return pageroot.getChildren();
160:            }
161:
162:            public NavigationElement getNavigationElementForPageRequest(
163:                    PageRequest page) {
164:                return pagetonavi.get(page.getRootName());
165:            }
166:
167:            public class NavigationElement {
168:                private ArrayList<NavigationElement> children = new ArrayList<NavigationElement>();
169:                private String name;
170:                private String handler;
171:
172:                public NavigationElement(String name, String handler) {
173:                    this .name = name;
174:                    this .handler = handler;
175:                }
176:
177:                public void addChild(NavigationElement elem) {
178:                    children.add(elem);
179:                }
180:
181:                public String getName() {
182:                    return name;
183:                }
184:
185:                public String getHandler() {
186:                    return handler;
187:                }
188:
189:                public boolean hasChildren() {
190:                    return !children.isEmpty();
191:                }
192:
193:                public NavigationElement[] getChildren() {
194:                    return children.toArray(new NavigationElement[] {});
195:                }
196:            } // NavigationElement
197:        }
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