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/*
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* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of the License "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:
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*
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*/
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package com.nokia.carbide.internal.discovery.ui.wizard;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.net.URI;
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import java.net.URISyntaxException;
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import java.text.MessageFormat;
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import javax.xml.parsers.ParserConfigurationException;
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import javax.xml.parsers.SAXParser;
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import javax.xml.parsers.SAXParserFactory;
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import org.eclipse.equinox.p2.metadata.Version;
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import org.xml.sax.Attributes;
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import org.xml.sax.SAXException;
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import org.xml.sax.helpers.DefaultHandler;
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import com.nokia.carbide.discovery.ui.Activator;
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/**
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* Serializes feature infos and repository URIs into output stream as XML
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* Example serialized single test connection:
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*
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* <blockquote><pre>
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*<featuresConfiguration version="1">
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* <autoImportOriginalVersions value="false"/>
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* <repository uri="http://cdn.symbian.org/carbide/updates/3.0/discovery"/>
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* <feature id="com.nokia.example.feature.group" version="1.0.0"/>
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*</featuresConfiguration>
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* </pre></blockquote>
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*/
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class Streamer {
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private static final String CURRENT_VERSION = "1"; //$NON-NLS-1$
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private static final String ROOT_ELEMENT = "featuresConfiguration"; //$NON-NLS-1$
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private static final String WANTS_VERSIONS_ELEMENT = "wantsOriginalVersions"; //$NON-NLS-1$
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private static final String REPOSITORY_ELEMENT = "repository"; //$NON-NLS-1$
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private static final String FEATURE_ELEMENT = "feature"; //$NON-NLS-1$
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private static final String VERSION_ATTR = "version"; //$NON-NLS-1$
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private static final String VALUE_ATTR = "value"; //$NON-NLS-1$
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private static final String URI_ATTR = "uri"; //$NON-NLS-1$
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private static final String ID_ATTR = "id"; //$NON-NLS-1$
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private static final String XML_HEADER = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n\n"; //$NON-NLS-1$
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private static final String ROOT_START = "<" + ROOT_ELEMENT + " " + VERSION_ATTR + "=\"" + CURRENT_VERSION + "\">\n"; //$NON-NLS-1$ //$NON-NLS-2$
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private static final String ROOT_END = "</" + ROOT_ELEMENT + ">\n"; //$NON-NLS-1$
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private static final String ORIGINAL_VERSION_FMT = "\t<" + WANTS_VERSIONS_ELEMENT + " " + VALUE_ATTR + "=\"{0}\"/>\n"; //$NON-NLS-1$
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private static final String REPOSITORY_FMT = "\t<" + REPOSITORY_ELEMENT + " " + URI_ATTR + "=\"{0}\"/>\n"; //$NON-NLS-1$
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private static final String FEATURE_FMT = "\t<" + FEATURE_ELEMENT + " " + ID_ATTR + "=\"{0}\" " + VERSION_ATTR + "=\"{1}\"/>\n"; //$NON-NLS-1$
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public static void writeToXML(OutputStream os, ImportExportData data) throws IOException {
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os.write(XML_HEADER.getBytes());
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os.write(ROOT_START.getBytes());
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// write auto-import original versions
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String originalVersionElement = MessageFormat.format(ORIGINAL_VERSION_FMT, data.getWantsVersions());
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os.write(originalVersionElement.getBytes());
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// write the repositories
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for (URI uri : data.getURIs()) {
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String repositoryElement = MessageFormat.format(REPOSITORY_FMT, uri);
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os.write(repositoryElement.getBytes());
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}
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// write the featureInfos
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for (FeatureInfo info : data.getFeatureInfos()) {
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String featureElement = MessageFormat.format(FEATURE_FMT, info.getId(), info.getVersion());
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os.write(featureElement.getBytes());
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}
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os.write(ROOT_END.getBytes());
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os.close();
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}
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private static class ReadHandler extends DefaultHandler {
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private final ImportExportData data;
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public ReadHandler(ImportExportData data) {
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this.data = data;
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}
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@Override
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public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
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if (ROOT_ELEMENT.equals(qName)) {
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String versionStr = attributes.getValue(VERSION_ATTR);
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if (!CURRENT_VERSION.equals(versionStr))
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throw new IllegalArgumentException(
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MessageFormat.format("Can only read version {0} of <{1}>", CURRENT_VERSION, ROOT_ELEMENT));
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}
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else if (WANTS_VERSIONS_ELEMENT.equals(qName)) {
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String wantsVersions = attributes.getValue(VALUE_ATTR);
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data.setWantsVersions(Boolean.parseBoolean(wantsVersions));
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}
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else if (REPOSITORY_ELEMENT.equals(qName)) {
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String uriStr = attributes.getValue(URI_ATTR);
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try {
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data.addURI(new URI(uriStr));
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} catch (URISyntaxException e) {
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Activator.logError(MessageFormat.format("Could not parse URI: {0}", uriStr), e);
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}
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}
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else if (FEATURE_ELEMENT.equals(qName)) {
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String id = attributes.getValue(ID_ATTR);
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String versionStr = attributes.getValue(VERSION_ATTR);
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try {
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Version version = Version.create(versionStr);
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data.addFeatureInfo(new FeatureInfo(id, version));
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} catch (IllegalArgumentException e) {
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Activator.logError(MessageFormat.format("Could not parse version: {0}", versionStr), e);
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}
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}
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}
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}
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public static ImportExportData readFromXML(InputStream is) throws SAXException, IOException, ParserConfigurationException {
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SAXParser parser = SAXParserFactory.newInstance().newSAXParser();
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ImportExportData data = new ImportExportData();
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parser.parse(is, new ReadHandler(data));
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return data;
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}
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}
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