com.google.inject.servlet.ServletUtils Maven / Gradle / Ivy
/**
* Copyright (C) 2012 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.inject.servlet;
import javax.servlet.http.HttpServletRequest;
/**
* Some servlet utility methods.
*
* @author [email protected] (Michael Tang)
*/
final class ServletUtils {
private ServletUtils() {
// private to prevent instantiation.
}
/**
* Gets the context path relative path of the URI. Returns the path of the
* resource relative to the context path for a request's URI, or null if no
* path can be extracted.
*/
// @Nullable
public static String getContextRelativePath(
// @Nullable
final HttpServletRequest request) {
if (request != null) {
String contextPath = request.getContextPath();
String requestURI = request.getRequestURI();
if (contextPath.length() < requestURI.length()) {
return requestURI.substring(contextPath.length());
} else if (requestURI != null && requestURI.trim().length() > 0 &&
contextPath.length() == requestURI.length()) {
return "/";
}
}
return null;
}
}