| /******************************************************************************* |
| * Copyright (c) 2006, 2016 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.help.internal.dynamic; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import javax.xml.parsers.ParserConfigurationException; |
| |
| import org.eclipse.help.HelpSystem; |
| import org.eclipse.help.internal.HelpPlugin; |
| import org.eclipse.help.internal.UAElement; |
| import org.eclipse.help.internal.extension.ContentExtension; |
| import org.eclipse.help.internal.extension.ContentExtensionManager; |
| import org.w3c.dom.Element; |
| import org.w3c.dom.Node; |
| import org.xml.sax.SAXException; |
| |
| /* |
| * Resolves the content to use for extensions. For anchors, these are the |
| * nodes that will be inserted at the anchor. For replaces, these are the |
| * nodes that will replace the original nodes. |
| */ |
| public class ExtensionResolver { |
| |
| private static final String ELEMENT_BODY = "body"; //$NON-NLS-1$ |
| private static final String ATTRIBUTE_ID = "id"; //$NON-NLS-1$ |
| |
| private DocumentProcessor processor; |
| private DocumentReader reader; |
| private String locale; |
| private ContentExtensionManager manager; |
| |
| /* |
| * Creates the resolver. The processor is needed to process the extension |
| * content, and locale because we're pulling in content from other documents. |
| */ |
| public ExtensionResolver(DocumentProcessor processor, DocumentReader reader, String locale) { |
| this.processor = processor; |
| this.reader = reader; |
| this.locale = locale; |
| } |
| |
| /* |
| * Resolves the given path into nodes to be inserted. |
| */ |
| public Node[] resolveExtension(String path, int type) { |
| if (manager == null) { |
| manager = HelpPlugin.getContentExtensionManager(); |
| } |
| ContentExtension[] extensions = manager.getExtensions(path, type, locale); |
| List<Node> list = new ArrayList<>(); |
| for (int i=0;i<extensions.length;++i) { |
| String content = extensions[i].getContent(); |
| try { |
| Node[] nodes = getContent(content); |
| for (int j=0;j<nodes.length;++j) { |
| list.add(nodes[j]); |
| } |
| } |
| catch (Throwable t) { |
| // ignore invalid extensions |
| } |
| } |
| return list.toArray(new Node[list.size()]); |
| } |
| |
| /* |
| * Resolves the given content path (the content to insert/replace with) into |
| * nodes. |
| */ |
| private Node[] getContent(String content) throws IOException, SAXException, ParserConfigurationException { |
| String bundleId = null; |
| String relativePath = null; |
| String nodeId = null; |
| |
| int bundleStart = 0; |
| // legacy; can omit leading slash |
| if (content.charAt(0) == '/') { |
| bundleStart = 1; |
| } |
| int bundleEnd = content.indexOf('/', bundleStart + 1); |
| if (bundleEnd > bundleStart) { |
| bundleId = content.substring(bundleStart, bundleEnd); |
| int pathStart = bundleEnd + 1; |
| int pathEnd = content.indexOf('#', pathStart + 1); |
| if (pathEnd == -1) { |
| // legacy; slash can be used instead of '#' |
| int lastSlash = content.lastIndexOf('/'); |
| int secondLastSlash = content.lastIndexOf('/', lastSlash - 1); |
| if (secondLastSlash != -1 && lastSlash > secondLastSlash) { |
| String secondLastToken = content.substring(secondLastSlash + 1, lastSlash); |
| if (secondLastToken.indexOf('.') != -1) { |
| pathEnd = lastSlash; |
| } |
| else { |
| pathEnd = content.length(); |
| } |
| } |
| else { |
| pathEnd = content.length(); |
| } |
| } |
| relativePath = content.substring(pathStart, pathEnd); |
| if (pathEnd < content.length()) { |
| nodeId = content.substring(pathEnd + 1); |
| } |
| } |
| |
| if (bundleId != null && relativePath != null) { |
| return getContent(bundleId, relativePath, nodeId); |
| } |
| return null; |
| } |
| |
| /* |
| * Resolves the given parsed content fragments into nodes. |
| */ |
| private Node[] getContent(String bundleId, String relativePath, String nodeId) throws IOException, SAXException, ParserConfigurationException { |
| String href = '/' + bundleId + '/' + relativePath; |
| try (InputStream in = HelpSystem.getHelpContent(href, locale)) { |
| if (nodeId != null) { |
| Element element = findElement(in, nodeId); |
| processor.process(new UAElement(element), href); |
| return new Node[] { element }; |
| } |
| Element body = findBody(in); |
| List<Node> children = new ArrayList<>(); |
| Node node = body.getFirstChild(); |
| while (node != null) { |
| if (node.getNodeType() == Node.ELEMENT_NODE) { |
| processor.process(new UAElement((Element)node), href); |
| } |
| children.add(node); |
| node = node.getNextSibling(); |
| } |
| return children.toArray(new Node[children.size()]); |
| } |
| } |
| |
| /* |
| * Finds and returns the element with the given elementId from the XML input |
| * stream, or null if not found. |
| */ |
| private Element findElement(InputStream in, String elementId) throws IOException, SAXException, ParserConfigurationException { |
| return findElement(reader.read(in).getElement(), elementId); |
| } |
| |
| /* |
| * Finds and returns the element with the given elementId from the under the |
| * given element, or null if not found. |
| */ |
| private Element findElement(Element element, String elementId) { |
| String id = element.getAttribute(ATTRIBUTE_ID); |
| if (id != null && id.equals(elementId)) { |
| return element; |
| } |
| Node node = element.getFirstChild(); |
| while (node != null) { |
| if (node.getNodeType() == Node.ELEMENT_NODE) { |
| element = findElement((Element)node, elementId); |
| if (element != null) { |
| return element; |
| } |
| } |
| node = node.getNextSibling(); |
| } |
| return null; |
| } |
| |
| /* |
| * Finds and returns the body node in the given XML input. |
| */ |
| private Element findBody(InputStream in) throws IOException, SAXException, ParserConfigurationException { |
| return findBody(reader.read(in).getElement()); |
| } |
| |
| /* |
| * Finds and returns the body node under the given node. |
| */ |
| private Element findBody(Element element) { |
| if (ELEMENT_BODY.equals(element.getNodeName())) { |
| return element; |
| } |
| Node node = element.getFirstChild(); |
| while (node != null) { |
| if (node.getNodeType() == Node.ELEMENT_NODE) { |
| Element body = findBody((Element)node); |
| if (body != null) { |
| return body; |
| } |
| } |
| node = node.getNextSibling(); |
| } |
| return null; |
| } |
| } |