| /******************************************************************************* |
| * Copyright (c) 2006, 2015 IBM Corporation 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: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.help.internal.dynamic; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| import javax.xml.parsers.ParserConfigurationException; |
| |
| import org.eclipse.help.HelpSystem; |
| import org.eclipse.help.IUAElement; |
| import org.eclipse.help.internal.UAElement; |
| import org.xml.sax.SAXException; |
| |
| /* |
| * Resolves includes by parsing the target document, extracting the node and |
| * replacing the original include with it. |
| */ |
| public class IncludeResolver { |
| |
| private static final String ATTRIBUTE_ID = "id"; //$NON-NLS-1$ |
| |
| private DocumentProcessor processor; |
| private DocumentReader reader; |
| private String locale; |
| |
| public IncludeResolver(DocumentProcessor processor, DocumentReader reader, String locale) { |
| this.processor = processor; |
| this.reader = reader; |
| this.locale = locale; |
| } |
| |
| /* |
| * Resolves the include target to a processed Element. |
| */ |
| public UAElement resolve(String bundleId, String relativePath, String elementId) throws IOException, SAXException, ParserConfigurationException { |
| String href = '/' + bundleId + '/' + relativePath; |
| InputStream in = HelpSystem.getHelpContent(href, locale); |
| try { |
| UAElement element = findElement(in, elementId); |
| processor.process(element, href); |
| return element; |
| } |
| finally { |
| try { |
| in.close(); |
| } |
| catch (IOException e) {} |
| } |
| } |
| |
| /* |
| * Finds the specified element from the given XML input stream. |
| */ |
| private UAElement findElement(InputStream in, String elementId) throws IOException, SAXException, ParserConfigurationException { |
| UAElement element = reader.read(in); |
| return findElement(element, elementId); |
| } |
| |
| /* |
| * Finds the specified element under the given subtree. |
| */ |
| private UAElement findElement(UAElement element, String elementId) { |
| String id = element.getAttribute(ATTRIBUTE_ID); |
| if (id != null && id.equals(elementId)) { |
| return element; |
| } |
| IUAElement[] children = element.getChildren(); |
| for (int i=0;i<children.length;++i) { |
| UAElement result = findElement((UAElement)children[i], elementId); |
| if (result != null) { |
| return result; |
| } |
| } |
| return null; |
| } |
| } |