| /* |
| * Copyright 2009 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| * use this file except in compliance with the License. You may obtain a copy of |
| * the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations under |
| * the License. |
| */ |
| package com.google.gwt.uibinder.rebind; |
| |
| import com.google.gwt.core.ext.TreeLogger; |
| import com.google.gwt.dev.resource.Resource; |
| import com.google.gwt.dev.resource.ResourceOracle; |
| import com.google.gwt.dev.util.Util; |
| import com.google.gwt.dev.util.collect.Sets; |
| |
| import org.xml.sax.EntityResolver; |
| import org.xml.sax.InputSource; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.StringReader; |
| import java.util.Collections; |
| import java.util.Set; |
| |
| /** |
| * Makes the sax xml parser use the {@link ResourceOracle}. |
| * <p> |
| * Does special case handling of GWT specific DTDs to be fetched from our |
| * download site. If the requested uri starts with |
| * <code>http://dl.google.com/gwt/DTD/</code> (or one or two others), provides |
| * the contents from a built in resource rather than allowing sax to make a |
| * network request. |
| */ |
| class GwtResourceEntityResolver implements EntityResolver { |
| private static final Set<String> EXTERNAL_PREFIXES = Collections.unmodifiableSet(Sets.create(new String[] { |
| "http://google-web-toolkit.googlecode.com/files/", |
| "http://dl.google.com/gwt/DTD/", "https://dl-ssl.google.com/gwt/DTD/"})); |
| |
| private static final String RESOURCES = "com/google/gwt/uibinder/resources/"; |
| |
| private String pathBase; |
| |
| private final ResourceOracle resourceOracle; |
| private final TreeLogger logger; |
| |
| public GwtResourceEntityResolver(TreeLogger logger, ResourceOracle resourceOracle, |
| String pathBase) { |
| this.logger = logger; |
| this.resourceOracle = resourceOracle; |
| this.pathBase = pathBase; |
| } |
| |
| @Override |
| public InputSource resolveEntity(String publicId, String systemId) { |
| String matchingPrefix = findMatchingPrefix(systemId); |
| |
| Resource resource = null; |
| if (matchingPrefix != null) { |
| resource = |
| resourceOracle.getResource(RESOURCES + systemId.substring(matchingPrefix.length())); |
| } |
| |
| if (resource == null) { |
| resource = resourceOracle.getResource(pathBase + systemId); |
| } |
| |
| if (resource != null) { |
| String content; |
| try { |
| InputStream resourceStream = resource.openContents(); |
| content = Util.readStreamAsString(resourceStream); |
| } catch (IOException ex) { |
| logger.log(TreeLogger.ERROR, "Error reading resource: " + resource.getLocation()); |
| throw new RuntimeException(ex); |
| } |
| InputSource inputSource = new InputSource(new StringReader(content)); |
| inputSource.setPublicId(publicId); |
| inputSource.setSystemId(resource.getPath()); |
| return inputSource; |
| } |
| /* |
| * Let Sax find it on the interweb. |
| */ |
| return null; |
| } |
| |
| private String findMatchingPrefix(String systemId) { |
| for (String prefix : EXTERNAL_PREFIXES) { |
| if (systemId.startsWith(prefix)) { |
| return prefix; |
| } |
| } |
| return null; |
| } |
| } |