Java tutorial
/* Copyright 2008-2010 Gephi Authors : Mathieu Bastian <mathieu.bastian@gephi.org> Website : http://www.gephi.org This file is part of Gephi. DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. Copyright 2011 Gephi Consortium. All rights reserved. The contents of this file are subject to the terms of either the GNU General Public License Version 3 only ("GPL") or the Common Development and Distribution License("CDDL") (collectively, the "License"). You may not use this file except in compliance with the License. You can obtain a copy of the License at http://gephi.org/about/legal/license-notice/ or /cddl-1.0.txt and /gpl-3.0.txt. See the License for the specific language governing permissions and limitations under the License. When distributing the software, include this License Header Notice in each file and include the License files at /cddl-1.0.txt and /gpl-3.0.txt. 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Contributor(s): Portions Copyrighted 2011 Gephi Consortium. */ package org.gephi.desktop.preview; import java.io.InputStream; import java.io.OutputStream; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Map.Entry; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.transform.OutputKeys; import javax.xml.transform.Result; import javax.xml.transform.Source; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerFactory; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; import org.apache.commons.codec.digest.DigestUtils; import org.gephi.preview.api.PreviewPreset; import org.gephi.preview.api.PreviewProperties; import org.gephi.preview.presets.DefaultPreset; import org.openide.filesystems.FileObject; import org.openide.filesystems.FileUtil; import org.openide.util.Exceptions; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.Node; import org.w3c.dom.NodeList; /** * * @author Mathieu Bastian */ public class PresetUtils { private List<PreviewPreset> presets; public void savePreset(PreviewPreset preset) { int exist = -1; for (int i = 0; i < presets.size(); i++) { PreviewPreset p = presets.get(i); if (p.getName().equals(preset.getName())) { exist = i; break; } } if (exist == -1) { addPreset(preset); } else { presets.set(exist, preset); } try { //Create file if dont exist FileObject folder = FileUtil.getConfigFile("previewpresets"); if (folder == null) { folder = FileUtil.getConfigRoot().createFolder("previewpresets"); } String filename = DigestUtils.sha1Hex(preset.getName());//Safe filename FileObject presetFile = folder.getFileObject(filename, "xml"); if (presetFile == null) { presetFile = folder.createData(filename, "xml"); } //Create doc DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); DocumentBuilder documentBuilder = factory.newDocumentBuilder(); final Document document = documentBuilder.newDocument(); document.setXmlVersion("1.0"); document.setXmlStandalone(true); //Write doc writeXML(document, preset); //Write XML file try (OutputStream outputStream = presetFile.getOutputStream()) { Source source = new DOMSource(document); Result result = new StreamResult(outputStream); Transformer transformer = TransformerFactory.newInstance().newTransformer(); transformer.setOutputProperty(OutputKeys.INDENT, "yes"); transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8"); transformer.transform(source, result); } } catch (Exception ex) { Exceptions.printStackTrace(ex); } } public PreviewPreset[] getPresets() { if (presets == null) { presets = new ArrayList<>(); loadPresets(); } return presets.toArray(new PreviewPreset[0]); } private void loadPresets() { FileObject folder = FileUtil.getConfigFile("previewpresets"); if (folder != null) { for (FileObject child : folder.getChildren()) { if (child.isValid() && child.hasExt("xml")) { try (InputStream stream = child.getInputStream()) { DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); Document document = builder.parse(stream); PreviewPreset preset = readXML(document); addPreset(preset); } catch (Exception ex) { Exceptions.printStackTrace(ex); } } } } } private void writeXML(Document doc, PreviewPreset preset) { Element presetE = doc.createElement("previewpreset"); presetE.setAttribute("name", preset.getName()); presetE.setAttribute("version", "0.8.1"); for (Entry<String, Object> entry : preset.getProperties().entrySet()) { String propertyName = entry.getKey(); try { Object propertyValue = entry.getValue(); if (propertyValue != null) { String serialized = PreviewProperties.getValueAsText(propertyValue); if (serialized != null) { Element propertyE = doc.createElement("previewproperty"); propertyE.setAttribute("name", propertyName); propertyE.setAttribute("class", propertyValue.getClass().getName()); propertyE.setTextContent(serialized); presetE.appendChild(propertyE); } } } catch (Exception ex) { Exceptions.printStackTrace(ex); } } doc.appendChild(presetE); } private PreviewPreset readXML(Document document) { DefaultPreset defaultPreset = new DefaultPreset();//For retrieving property class if it is not in the xml (old serialization) Element presetE = document.getDocumentElement(); Map<String, Object> propertiesMap = new HashMap<>(); String presetName = presetE.getAttribute("name"); NodeList propertyList = presetE.getElementsByTagName("previewproperty"); for (int i = 0; i < propertyList.getLength(); i++) { Node n = propertyList.item(i); if (n.getNodeType() == Node.ELEMENT_NODE) { Element propertyE = (Element) n; String name = propertyE.getAttribute("name"); String valueClassName = propertyE.hasAttribute(name) ? propertyE.getAttribute("class") : null; String stringValue = propertyE.getTextContent(); Class valueClass = null; if (valueClassName != null) { try { valueClass = Class.forName(valueClassName); } catch (ClassNotFoundException ex) { Exceptions.printStackTrace(ex); } } else { Object defaultValue = defaultPreset.getProperties().get(name); if (defaultValue != null) { valueClass = defaultValue.getClass(); } } if (valueClass != null) { Object value = PreviewProperties.readValueFromText(stringValue, valueClass); if (value != null) { propertiesMap.put(name, value); } } } } return new PreviewPreset(presetName, propertiesMap); } private void addPreset(PreviewPreset preset) { presets.add(preset); } }