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- /*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You 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.
- */
-
- /* $Id$ */
-
- package org.apache.fop.servlet;
-
- import java.io.InputStream;
- import java.net.MalformedURLException;
- import java.net.URL;
-
- import javax.servlet.ServletContext;
- import javax.xml.transform.Source;
- import javax.xml.transform.TransformerException;
- import javax.xml.transform.URIResolver;
- import javax.xml.transform.stream.StreamSource;
-
- /**
- * This class is a URIResolver implementation that provides access to resources in the WEB-INF
- * directory of a web application using "servlet-content:" URIs.
- */
- public class ServletContextURIResolver implements URIResolver {
-
- /** The protocol name for the servlet context URIs. */
- public static final String SERVLET_CONTEXT_PROTOCOL = "servlet-context:";
-
- private ServletContext servletContext;
-
- /**
- * Main constructor
- * @param servletContext the servlet context to access the resources through
- */
- public ServletContextURIResolver(ServletContext servletContext) {
- this.servletContext = servletContext;
- }
-
- /** {@inheritDoc} */
- public Source resolve(String href, String base) throws TransformerException {
- if (href.startsWith(SERVLET_CONTEXT_PROTOCOL)) {
- return resolveServletContextURI(href.substring(SERVLET_CONTEXT_PROTOCOL.length()));
- } else {
- if (base != null
- && base.startsWith(SERVLET_CONTEXT_PROTOCOL)
- && (href.indexOf(':') < 0)) {
- String abs = base + href;
- return resolveServletContextURI(
- abs.substring(SERVLET_CONTEXT_PROTOCOL.length()));
- } else {
- return null;
- }
- }
- }
-
- /**
- * Resolves the "servlet-context:" URI.
- * @param path the path part after the protocol (should start with a "/")
- * @return the resolved Source or null if the resource was not found
- * @throws TransformerException if no URL can be constructed from the path
- */
- protected Source resolveServletContextURI(String path) throws TransformerException {
- while (path.startsWith("//")) {
- path = path.substring(1);
- }
- try {
- URL url = this.servletContext.getResource(path);
- InputStream in = this.servletContext.getResourceAsStream(path);
- if (in != null) {
- if (url != null) {
- return new StreamSource(in, url.toExternalForm());
- } else {
- return new StreamSource(in);
- }
- } else {
- throw new TransformerException("Resource does not exist. \"" + path
- + "\" is not accessible through the servlet context.");
- }
- } catch (MalformedURLException mfue) {
- throw new TransformerException(
- "Error accessing resource using servlet context: " + path, mfue);
- }
- }
- }
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