Java tutorial
/* * Copyright (c) 2004-2007 Marco Maccaferri and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * Marco Maccaferri - initial API and implementation */ package net.sourceforge.eclipsetrader.charts; import java.io.BufferedWriter; import java.io.File; import java.io.FileOutputStream; import java.io.FileWriter; import java.io.InputStream; import java.io.OutputStream; import java.text.NumberFormat; import java.text.SimpleDateFormat; import java.util.Iterator; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.transform.OutputKeys; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerFactory; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; import net.sourceforge.eclipsetrader.core.CorePlugin; import net.sourceforge.eclipsetrader.core.db.Chart; import net.sourceforge.eclipsetrader.core.db.ChartIndicator; import net.sourceforge.eclipsetrader.core.db.ChartObject; import net.sourceforge.eclipsetrader.core.db.ChartRow; import net.sourceforge.eclipsetrader.core.db.ChartTab; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.eclipse.core.runtime.FileLocator; import org.eclipse.core.runtime.IConfigurationElement; import org.eclipse.core.runtime.IExtensionPoint; import org.eclipse.core.runtime.IExtensionRegistry; import org.eclipse.core.runtime.Path; import org.eclipse.core.runtime.Platform; import org.eclipse.jface.resource.ImageDescriptor; import org.eclipse.ui.plugin.AbstractUIPlugin; import org.osgi.framework.BundleContext; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.Node; import org.w3c.dom.NodeList; /** * The main plugin class to be used in the desktop. */ public class ChartsPlugin extends AbstractUIPlugin { public static final String PLUGIN_ID = "net.sourceforge.eclipsetrader.charts"; //$NON-NLS-1$ public static final String INDICATORS_EXTENSION_POINT = PLUGIN_ID + ".indicators"; //$NON-NLS-1$ public static final String OBJECTS_EXTENSION_POINT = PLUGIN_ID + ".objects"; //$NON-NLS-1$ public static final String PREFS_HIDE_TABS = "HIDE_TABS"; //$NON-NLS-1$ public static final String PREFS_EXTEND_SCALE = "EXTEND_SCALE"; //$NON-NLS-1$ public static final String PREFS_EXTEND_PERIOD = "EXTEND_PERIOD"; //$NON-NLS-1$ private static ChartsPlugin plugin; private static NumberFormat numberFormat; private static NumberFormat percentageFormat; private static NumberFormat priceFormat; /** * The constructor. */ public ChartsPlugin() { plugin = this; } /** * This method is called upon plug-in activation */ public void start(BundleContext context) throws Exception { super.start(context); copyFileToStateLocation("defaultChart.xml"); //$NON-NLS-1$ } /** * This method is called when the plug-in is stopped */ public void stop(BundleContext context) throws Exception { super.stop(context); plugin = null; } /** * Returns the shared instance. */ public static ChartsPlugin getDefault() { return plugin; } public static NumberFormat getNumberFormat() { if (numberFormat == null) { numberFormat = NumberFormat.getInstance(); numberFormat.setGroupingUsed(true); numberFormat.setMinimumIntegerDigits(1); numberFormat.setMinimumFractionDigits(0); numberFormat.setMaximumFractionDigits(0); } return numberFormat; } public static NumberFormat getPercentageFormat() { if (percentageFormat == null) { percentageFormat = NumberFormat.getInstance(); percentageFormat.setGroupingUsed(false); percentageFormat.setMinimumIntegerDigits(1); percentageFormat.setMinimumFractionDigits(2); percentageFormat.setMaximumFractionDigits(2); } return percentageFormat; } public static NumberFormat getPriceFormat() { if (priceFormat == null) { priceFormat = NumberFormat.getInstance(); priceFormat.setGroupingUsed(true); priceFormat.setMinimumIntegerDigits(1); priceFormat.setMinimumFractionDigits(4); priceFormat.setMaximumFractionDigits(4); } return priceFormat; } /** * Returns an image descriptor for the image file at the given * plug-in relative path. * * @param path the path * @return the image descriptor */ public static ImageDescriptor getImageDescriptor(String path) { return AbstractUIPlugin.imageDescriptorFromPlugin(PLUGIN_ID, path); } public static IIndicatorPlugin createIndicatorPlugin(String id) { IConfigurationElement item = getIndicatorPlugin(id); if (item != null) { try { Object obj = item.createExecutableExtension("class"); //$NON-NLS-1$ if (obj instanceof IIndicatorPlugin) return (IIndicatorPlugin) obj; } catch (Exception e) { e.printStackTrace(); } } return null; } public static IConfigurationElement getIndicatorPlugin(String id) { IExtensionRegistry registry = Platform.getExtensionRegistry(); IExtensionPoint extensionPoint = registry.getExtensionPoint(ChartsPlugin.INDICATORS_EXTENSION_POINT); if (extensionPoint != null) { IConfigurationElement[] members = extensionPoint.getConfigurationElements(); for (int i = 0; i < members.length; i++) { IConfigurationElement item = members[i]; if (item.getAttribute("id").equals(id)) //$NON-NLS-1$ return item; } } return null; } public static ObjectPlugin createObjectPlugin(String id) { IConfigurationElement item = getObjectPlugin(id); if (item != null) { try { Object obj = item.createExecutableExtension("class"); //$NON-NLS-1$ if (obj instanceof ObjectPlugin) return (ObjectPlugin) obj; } catch (Exception e) { e.printStackTrace(); } } return null; } public static IConfigurationElement getObjectPlugin(String id) { IExtensionRegistry registry = Platform.getExtensionRegistry(); IExtensionPoint extensionPoint = registry.getExtensionPoint(ChartsPlugin.OBJECTS_EXTENSION_POINT); if (extensionPoint != null) { IConfigurationElement[] members = extensionPoint.getConfigurationElements(); for (int i = 0; i < members.length; i++) { IConfigurationElement item = members[i]; if (item.getAttribute("id").equals(id)) //$NON-NLS-1$ return item; } } return null; } public static Chart createDefaultChart() { Log logger = LogFactory.getLog(ChartsPlugin.class); SimpleDateFormat dateTimeFormat = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss"); //$NON-NLS-1$ Chart chart = new Chart(); File file = ChartsPlugin.getDefault().getStateLocation().append("defaultChart.xml").toFile(); //$NON-NLS-1$ if (file.exists() == true) { try { DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); Document document = builder.parse(file); NodeList firstNode = document.getFirstChild().getChildNodes(); for (int r = 0; r < firstNode.getLength(); r++) { Node item = firstNode.item(r); Node valueNode = item.getFirstChild(); String nodeName = item.getNodeName(); if (valueNode != null) { if (nodeName.equalsIgnoreCase("compression") == true) //$NON-NLS-1$ chart.setCompression(Integer.parseInt(valueNode.getNodeValue())); else if (nodeName.equalsIgnoreCase("period") == true) //$NON-NLS-1$ chart.setPeriod(Integer.parseInt(valueNode.getNodeValue())); else if (nodeName.equalsIgnoreCase("autoScale") == true) //$NON-NLS-1$ chart.setAutoScale(new Boolean(valueNode.getNodeValue()).booleanValue()); else if (nodeName.equalsIgnoreCase("begin") == true) //$NON-NLS-1$ { try { chart.setBeginDate(dateTimeFormat.parse(valueNode.getNodeValue())); } catch (Exception e) { logger.warn(e.toString()); } } else if (nodeName.equalsIgnoreCase("end") == true) //$NON-NLS-1$ { try { chart.setEndDate(dateTimeFormat.parse(valueNode.getNodeValue())); } catch (Exception e) { logger.warn(e.toString()); } } } if (nodeName.equalsIgnoreCase("row")) //$NON-NLS-1$ { ChartRow row = new ChartRow(new Integer(r)); row.setParent(chart); NodeList tabList = item.getChildNodes(); for (int t = 0; t < tabList.getLength(); t++) { item = tabList.item(t); nodeName = item.getNodeName(); if (nodeName.equalsIgnoreCase("tab")) //$NON-NLS-1$ { ChartTab tab = new ChartTab(new Integer(t)); tab.setParent(row); tab.setLabel(((Node) item).getAttributes().getNamedItem("label").getNodeValue()); //$NON-NLS-1$ NodeList indicatorList = item.getChildNodes(); for (int i = 0; i < indicatorList.getLength(); i++) { item = indicatorList.item(i); nodeName = item.getNodeName(); if (nodeName.equalsIgnoreCase("indicator")) //$NON-NLS-1$ { ChartIndicator indicator = new ChartIndicator(new Integer(i)); indicator.setParent(tab); indicator.setPluginId(((Node) item).getAttributes().getNamedItem("pluginId") //$NON-NLS-1$ .getNodeValue()); NodeList parametersList = item.getChildNodes(); for (int p = 0; p < parametersList.getLength(); p++) { item = parametersList.item(p); nodeName = item.getNodeName(); if (nodeName.equalsIgnoreCase("param")) //$NON-NLS-1$ { String key = ((Node) item).getAttributes().getNamedItem("key") //$NON-NLS-1$ .getNodeValue(); String value = ((Node) item).getAttributes().getNamedItem("value") //$NON-NLS-1$ .getNodeValue(); indicator.getParameters().put(key, value); } } tab.getIndicators().add(indicator); } else if (nodeName.equalsIgnoreCase("object")) //$NON-NLS-1$ { ChartObject object = new ChartObject(new Integer(i)); object.setParent(tab); object.setPluginId(((Node) item).getAttributes().getNamedItem("pluginId") //$NON-NLS-1$ .getNodeValue()); NodeList parametersList = item.getChildNodes(); for (int p = 0; p < parametersList.getLength(); p++) { item = parametersList.item(p); nodeName = item.getNodeName(); if (nodeName.equalsIgnoreCase("param")) //$NON-NLS-1$ { String key = ((Node) item).getAttributes().getNamedItem("key") //$NON-NLS-1$ .getNodeValue(); String value = ((Node) item).getAttributes().getNamedItem("value") //$NON-NLS-1$ .getNodeValue(); object.getParameters().put(key, value); } } tab.getObjects().add(object); } } row.getTabs().add(tab); } } chart.getRows().add(row); } } } catch (Exception e) { logger.error(e.toString(), e); } } chart.clearChanged(); return chart; } public static void saveDefaultChart(Chart chart) { Log logger = LogFactory.getLog(ChartsPlugin.class); SimpleDateFormat dateTimeFormat = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss"); //$NON-NLS-1$ try { DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder(); Document document = builder.getDOMImplementation().createDocument(null, "chart", null); //$NON-NLS-1$ Element root = document.getDocumentElement(); Element node = document.createElement("title"); //$NON-NLS-1$ node.appendChild(document.createTextNode(chart.getTitle())); root.appendChild(node); node = document.createElement("compression"); //$NON-NLS-1$ node.appendChild(document.createTextNode(String.valueOf(chart.getCompression()))); root.appendChild(node); node = document.createElement("period"); //$NON-NLS-1$ node.appendChild(document.createTextNode(String.valueOf(chart.getPeriod()))); root.appendChild(node); node = document.createElement("autoScale"); //$NON-NLS-1$ node.appendChild(document.createTextNode(String.valueOf(chart.isAutoScale()))); root.appendChild(node); if (chart.getBeginDate() != null) { node = document.createElement("begin"); //$NON-NLS-1$ node.appendChild(document.createTextNode(dateTimeFormat.format(chart.getBeginDate()))); root.appendChild(node); } if (chart.getEndDate() != null) { node = document.createElement("end"); //$NON-NLS-1$ node.appendChild(document.createTextNode(dateTimeFormat.format(chart.getEndDate()))); root.appendChild(node); } for (int r = 0; r < chart.getRows().size(); r++) { ChartRow row = (ChartRow) chart.getRows().get(r); row.setId(new Integer(r)); Element rowNode = document.createElement("row"); //$NON-NLS-1$ root.appendChild(rowNode); for (int t = 0; t < row.getTabs().size(); t++) { ChartTab tab = (ChartTab) row.getTabs().get(t); tab.setId(new Integer(t)); Element tabNode = document.createElement("tab"); //$NON-NLS-1$ tabNode.setAttribute("label", tab.getLabel()); //$NON-NLS-1$ rowNode.appendChild(tabNode); for (int i = 0; i < tab.getIndicators().size(); i++) { ChartIndicator indicator = (ChartIndicator) tab.getIndicators().get(i); indicator.setId(new Integer(i)); Element indicatorNode = document.createElement("indicator"); //$NON-NLS-1$ indicatorNode.setAttribute("pluginId", indicator.getPluginId()); //$NON-NLS-1$ tabNode.appendChild(indicatorNode); for (Iterator iter = indicator.getParameters().keySet().iterator(); iter.hasNext();) { String key = (String) iter.next(); node = document.createElement("param"); //$NON-NLS-1$ node.setAttribute("key", key); //$NON-NLS-1$ node.setAttribute("value", (String) indicator.getParameters().get(key)); //$NON-NLS-1$ indicatorNode.appendChild(node); } } for (int i = 0; i < tab.getObjects().size(); i++) { ChartObject object = (ChartObject) tab.getObjects().get(i); object.setId(new Integer(i)); Element indicatorNode = document.createElement("object"); //$NON-NLS-1$ indicatorNode.setAttribute("pluginId", object.getPluginId()); //$NON-NLS-1$ tabNode.appendChild(indicatorNode); for (Iterator iter = object.getParameters().keySet().iterator(); iter.hasNext();) { String key = (String) iter.next(); node = document.createElement("param"); //$NON-NLS-1$ node.setAttribute("key", key); //$NON-NLS-1$ node.setAttribute("value", (String) object.getParameters().get(key)); //$NON-NLS-1$ indicatorNode.appendChild(node); } } } } TransformerFactory factory = TransformerFactory.newInstance(); try { factory.setAttribute("indent-number", new Integer(4)); //$NON-NLS-1$ } catch (Exception e) { } Transformer transformer = factory.newTransformer(); transformer.setOutputProperty(OutputKeys.METHOD, "xml"); //$NON-NLS-1$ transformer.setOutputProperty(OutputKeys.ENCODING, "ISO-8859-1"); //$NON-NLS-1$ transformer.setOutputProperty(OutputKeys.INDENT, "yes"); //$NON-NLS-1$ transformer.setOutputProperty("{http\u003a//xml.apache.org/xslt}indent-amount", "4"); //$NON-NLS-1$ //$NON-NLS-2$ DOMSource source = new DOMSource(document); File file = ChartsPlugin.getDefault().getStateLocation().append("defaultChart.xml").toFile(); //$NON-NLS-1$ BufferedWriter out = new BufferedWriter(new FileWriter(file)); StreamResult result = new StreamResult(out); transformer.transform(source, result); out.flush(); out.close(); } catch (Exception e) { logger.error(e.toString(), e); } } private void copyFileToStateLocation(String file) { File f = ChartsPlugin.getDefault().getStateLocation().append(file).toFile(); if (!f.exists()) { try { byte[] buffer = new byte[10240]; OutputStream os = new FileOutputStream(f); InputStream is = FileLocator.openStream(getBundle(), new Path("data/" + file), false); //$NON-NLS-1$ int readed = 0; do { readed = is.read(buffer); os.write(buffer, 0, readed); } while (readed == buffer.length); os.close(); is.close(); } catch (Exception e) { CorePlugin.logException(e); } } } }