| /******************************************************************************* |
| * Copyright (c) 2007, 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; |
| |
| import java.io.BufferedReader; |
| import java.io.BufferedWriter; |
| import java.io.File; |
| import java.io.FileNotFoundException; |
| import java.io.FileReader; |
| import java.io.FileWriter; |
| import java.io.IOException; |
| import java.io.InputStreamReader; |
| import java.io.StringReader; |
| import java.net.URL; |
| import java.net.URLConnection; |
| |
| import org.xml.sax.EntityResolver; |
| import org.xml.sax.InputSource; |
| |
| |
| public class CachedEntityResolver implements EntityResolver { |
| |
| @Override |
| public InputSource resolveEntity(String publicId, String systemId) { |
| int index = systemId.lastIndexOf("/"); //$NON-NLS-1$ |
| File cachedCopy = null; |
| if (index != -1) { |
| cachedCopy = new File(HelpPlugin.getConfigurationDirectory(), "/DTDs"); //$NON-NLS-1$ |
| cachedCopy.mkdirs(); |
| cachedCopy = new File(cachedCopy, systemId.substring(index)); |
| } |
| if (cachedCopy != null) { |
| if (!cachedCopy.exists()) { |
| try { |
| URL system = new URL(systemId); |
| URLConnection sc = system.openConnection(); |
| String inputLine; |
| try (BufferedReader in = new BufferedReader(new InputStreamReader(sc.getInputStream())); |
| BufferedWriter out = new BufferedWriter(new FileWriter(cachedCopy))) { |
| while ((inputLine = in.readLine()) != null) { |
| out.write(inputLine); |
| out.newLine(); |
| } |
| out.flush(); |
| } |
| } catch (IOException e) { |
| } |
| } |
| try { |
| InputSource is = new InputSource(new FileReader(cachedCopy)); |
| is.setSystemId(systemId); |
| is.setPublicId(publicId); |
| return is; |
| } catch (FileNotFoundException e) {} |
| } |
| return new InputSource(new StringReader("")); //$NON-NLS-1$ |
| } |
| |
| } |