| /******************************************************************************* |
| * Copyright (c) 2008 Angelo Zerr 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: |
| * Angelo Zerr <angelo.zerr@gmail.com> - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.e4.ui.css.core.util.impl.resources; |
| |
| import java.io.InputStream; |
| import java.io.Reader; |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import org.eclipse.e4.ui.css.core.util.resources.IResourceLocator; |
| import org.eclipse.e4.ui.css.core.util.resources.IResourcesLocatorManager; |
| import org.eclipse.e4.ui.css.core.utils.StringUtils; |
| |
| /** |
| * Resources locator manager implementation. |
| */ |
| public class ResourcesLocatorManager implements IResourcesLocatorManager { |
| |
| /** |
| * ResourcesLocatorManager Singleton |
| */ |
| public static final IResourcesLocatorManager INSTANCE = new ResourcesLocatorManager(); |
| |
| /** |
| * List of IResourceLocator instance which was registered. |
| */ |
| private List uriResolvers = null; |
| |
| public ResourcesLocatorManager() { |
| registerResourceLocator(new HttpResourcesLocatorImpl()); |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.e4.ui.css.core.util.resources.IResourcesLocatorManager#registerResourceLocator(org.eclipse.e4.ui.css.core.util.resources.IResourceLocator) |
| */ |
| public void registerResourceLocator(IResourceLocator resourceLocator) { |
| if (uriResolvers == null) |
| uriResolvers = new ArrayList(); |
| uriResolvers.add(resourceLocator); |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.e4.ui.css.core.util.resources.IResourcesLocatorManager#unregisterResourceLocator(org.eclipse.e4.ui.css.core.util.resources.IResourceLocator) |
| */ |
| public void unregisterResourceLocator(IResourceLocator resourceLocator) { |
| if (uriResolvers == null) |
| return; |
| uriResolvers.remove(resourceLocator); |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.e4.ui.css.core.util.resources.IURIResolver#resolve(java.lang.String) |
| */ |
| public String resolve(String uri) { |
| if (StringUtils.isEmpty(uri)) |
| return null; |
| if (uriResolvers == null) |
| return null; |
| // Loop for IResourceLocator registered and return the uri resolved |
| // as soon as an IResourceLocator return an uri resolved which is not |
| // null. |
| for (Iterator iterator = uriResolvers.iterator(); iterator.hasNext();) { |
| IResourceLocator resolver = (IResourceLocator) iterator.next(); |
| String s = resolver.resolve(uri); |
| if (s != null) |
| return s; |
| } |
| return null; |
| } |
| |
| public InputStream getInputStream(String uri) throws Exception { |
| if (StringUtils.isEmpty(uri)) |
| return null; |
| if (uriResolvers == null) |
| return null; |
| // Loop for IResourceLocator registered and return the InputStream from |
| // the uri resolved |
| // as soon as an IResourceLocator return an uri resolved which is not |
| // null. |
| for (Iterator iterator = uriResolvers.iterator(); iterator.hasNext();) { |
| IResourceLocator resolver = (IResourceLocator) iterator.next(); |
| String s = resolver.resolve(uri); |
| if (s != null) { |
| InputStream inputStream = resolver.getInputStream(uri); |
| if (inputStream != null) |
| return inputStream; |
| } |
| } |
| return null; |
| } |
| |
| public Reader getReader(String uri) throws Exception { |
| if (StringUtils.isEmpty(uri)) |
| return null; |
| if (uriResolvers == null) |
| return null; |
| // Loop for IResourceLocator registered and return the Reader from |
| // the uri resolved |
| // as soon as an IResourceLocator return an uri resolved which is not |
| // null. |
| for (Iterator iterator = uriResolvers.iterator(); iterator.hasNext();) { |
| IResourceLocator resolver = (IResourceLocator) iterator.next(); |
| String s = resolver.resolve(uri); |
| if (s != null) { |
| Reader reader = resolver.getReader(uri); |
| if (reader != null) |
| return reader; |
| } |
| } |
| |
| return null; |
| } |
| |
| } |