TMF: Add the XML analysis module source

[deliverable/tracecompass.git] / org.eclipse.linuxtools.tmf.analysis.xml.ui / src / org / eclipse / linuxtools / tmf / analysis / xml / ui / module / XmlAnalysisModuleSource.java

/*******************************************************************************
 * Copyright (c) 2014 École Polytechnique de Montréal
 *
 * 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:
 *   Geneviève Bastien - Initial API and implementation
 *******************************************************************************/

package org.eclipse.linuxtools.tmf.analysis.xml.ui.module;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.eclipse.core.runtime.IPath;
import org.eclipse.linuxtools.internal.tmf.analysis.xml.ui.Activator;
import org.eclipse.linuxtools.tmf.analysis.xml.core.module.XmlUtils;
import org.eclipse.linuxtools.tmf.analysis.xml.core.stateprovider.TmfXmlStrings;
import org.eclipse.linuxtools.tmf.analysis.xml.ui.module.TmfAnalysisModuleHelperXml.XmlAnalysisModuleType;
import org.eclipse.linuxtools.tmf.core.analysis.IAnalysisModuleHelper;
import org.eclipse.linuxtools.tmf.core.analysis.IAnalysisModuleSource;
import org.eclipse.linuxtools.tmf.core.analysis.TmfAnalysisManager;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

/**
 * Analysis module source who creates helpers for the analysis modules described
 * in the imported XML files
 *
 * @author Geneviève Bastien
 * @since 3.0
 */
public class XmlAnalysisModuleSource implements IAnalysisModuleSource {

    private static List<IAnalysisModuleHelper> fModules = null;

    @Override
    public synchronized Iterable<IAnalysisModuleHelper> getAnalysisModules() {
        if (fModules == null) {
            populateAnalysisModules();
        }
        return fModules;
    }

    private static void populateAnalysisModules() {
        fModules = new ArrayList<>();
        IPath pathToFiles = XmlUtils.getXmlFilesPath();
        File fFolder = pathToFiles.toFile();
        if (!(fFolder.isDirectory() && fFolder.exists())) {
            return;
        }
        for (File xmlFile : fFolder.listFiles()) {
            if (!XmlUtils.xmlValidate(xmlFile).isOK()) {
                continue;
            }

            try {
                /* Load the XML File */
                DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
                DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
                Document doc = dBuilder.parse(xmlFile);
                doc.getDocumentElement().normalize();

                /* get State Providers modules */
                NodeList stateproviderNodes = doc.getElementsByTagName(TmfXmlStrings.STATE_PROVIDER);
                for (int i = 0; i < stateproviderNodes.getLength(); i++) {
                    Element node = (Element) stateproviderNodes.item(i);

                    IAnalysisModuleHelper helper = new TmfAnalysisModuleHelperXml(xmlFile, node, XmlAnalysisModuleType.STATE_SYSTEM);
                    fModules.add(helper);
                }
            } catch (ParserConfigurationException | SAXException | IOException e) {
                Activator.logError("Error opening XML file", e); //$NON-NLS-1$
            }
        }
    }

    /**
     * Notifies the main XML analysis module that the executable modules list
     * may have changed and needs to be refreshed.
     */
    public static void notifyModuleChange() {
        fModules = null;
        TmfAnalysisManager.refreshModules();
    }

}