--- /dev/null
+/*
+ * 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.
+ */
+package javax.servlet;
+
+import java.io.IOException;
+
+/**
+ * Defines an object that receives requests from the client and sends them to
+ * any resource (such as a servlet, HTML file, or JSP file) on the server. The
+ * servlet container creates the <code>RequestDispatcher</code> object, which is
+ * used as a wrapper around a server resource located at a particular path or
+ * given by a particular name.
+ *
+ * <p>
+ * This interface is intended to wrap servlets, but a servlet container can
+ * create <code>RequestDispatcher</code> objects to wrap any type of resource.
+ *
+ * @see ServletContext#getRequestDispatcher(java.lang.String)
+ * @see ServletContext#getNamedDispatcher(java.lang.String)
+ * @see ServletRequest#getRequestDispatcher(java.lang.String)
+ *
+ */
+public interface RequestDispatcher {
+
+ /**
+ * The name of the request attribute that should be set by the container
+ * when the {@link #forward(ServletRequest, ServletResponse)} method is
+ * called. It provides the original value of a path-related property of the
+ * request. See the chapter "Forwarded Request Parameters" in the Servlet
+ * Specification for details.
+ *
+ * @since Servlet 3.0
+ */
+ static final String FORWARD_REQUEST_URI = "javax.servlet.forward.request_uri";
+
+ /**
+ * The name of the request attribute that should be set by the container
+ * when the {@link #forward(ServletRequest, ServletResponse)} method is
+ * called. It provides the original value of a path-related property of the
+ * request. See the chapter "Forwarded Request Parameters" in the Servlet
+ * Specification for details.
+ *
+ * @since Servlet 3.0
+ */
+ static final String FORWARD_CONTEXT_PATH = "javax.servlet.forward.context_path";
+
+ /**
+ * The name of the request attribute that should be set by the container
+ * when the {@link #forward(ServletRequest, ServletResponse)} method is
+ * called. It provides the original value of a path-related property of the
+ * request. See the chapter "Forwarded Request Parameters" in the Servlet
+ * Specification for details.
+ *
+ * @since Servlet 3.0
+ */
+ static final String FORWARD_PATH_INFO = "javax.servlet.forward.path_info";
+
+ /**
+ * The name of the request attribute that should be set by the container
+ * when the {@link #forward(ServletRequest, ServletResponse)} method is
+ * called. It provides the original value of a path-related property of the
+ * request. See the chapter "Forwarded Request Parameters" in the Servlet
+ * Specification for details.
+ *
+ * @since Servlet 3.0
+ */
+ static final String FORWARD_SERVLET_PATH = "javax.servlet.forward.servlet_path";
+
+ /**
+ * The name of the request attribute that should be set by the container
+ * when the {@link #forward(ServletRequest, ServletResponse)} method is
+ * called. It provides the original value of a path-related property of the
+ * request. See the chapter "Forwarded Request Parameters" in the Servlet
+ * Specification for details.
+ *
+ * @since Servlet 3.0
+ */
+ static final String FORWARD_QUERY_STRING = "javax.servlet.forward.query_string";
+
+ /**
+ * The name of the request attribute that should be set by the container
+ * when the {@link #include(ServletRequest, ServletResponse)} method is
+ * called on the {@code RequestDispatcher} obtained by a path and not by a
+ * name. It provides information on the path that was used to obtain the
+ * {@code RequestDispatcher} instance for this include call. See the chapter
+ * "Included Request Parameters" in the Servlet Specification for details.
+ *
+ * @since Servlet 3.0
+ */
+ static final String INCLUDE_REQUEST_URI = "javax.servlet.include.request_uri";
+
+ /**
+ * The name of the request attribute that should be set by the container
+ * when the {@link #include(ServletRequest, ServletResponse)} method is
+ * called on the {@code RequestDispatcher} obtained by a path and not by a
+ * name. It provides information on the path that was used to obtain the
+ * {@code RequestDispatcher} instance for this include call. See the chapter
+ * "Included Request Parameters" in the Servlet Specification for details.
+ *
+ * @since Servlet 3.0
+ */
+ static final String INCLUDE_CONTEXT_PATH = "javax.servlet.include.context_path";
+
+ /**
+ * The name of the request attribute that should be set by the container
+ * when the {@link #include(ServletRequest, ServletResponse)} method is
+ * called on the {@code RequestDispatcher} obtained by a path and not by a
+ * name. It provides information on the path that was used to obtain the
+ * {@code RequestDispatcher} instance for this include call. See the chapter
+ * "Included Request Parameters" in the Servlet Specification for details.
+ *
+ * @since Servlet 3.0
+ */
+ static final String INCLUDE_PATH_INFO = "javax.servlet.include.path_info";
+
+ /**
+ * The name of the request attribute that should be set by the container
+ * when the {@link #include(ServletRequest, ServletResponse)} method is
+ * called on the {@code RequestDispatcher} obtained by a path and not by a
+ * name. It provides information on the path that was used to obtain the
+ * {@code RequestDispatcher} instance for this include call. See the chapter
+ * "Included Request Parameters" in the Servlet Specification for details.
+ *
+ * @since Servlet 3.0
+ */
+ static final String INCLUDE_SERVLET_PATH = "javax.servlet.include.servlet_path";
+
+ /**
+ * The name of the request attribute that should be set by the container
+ * when the {@link #include(ServletRequest, ServletResponse)} method is
+ * called on the {@code RequestDispatcher} obtained by a path and not by a
+ * name. It provides information on the path that was used to obtain the
+ * {@code RequestDispatcher} instance for this include call. See the chapter
+ * "Included Request Parameters" in the Servlet Specification for details.
+ *
+ * @since Servlet 3.0
+ */
+ static final String INCLUDE_QUERY_STRING = "javax.servlet.include.query_string";
+
+ /**
+ * The name of the request attribute that should be set by the container
+ * when custom error-handling servlet or JSP page is invoked. The value of
+ * the attribute is of type {@code java.lang.Throwable}. See the chapter
+ * "Error Handling" in the Servlet Specification for details.
+ *
+ * @since Servlet 3.0
+ */
+ public static final String ERROR_EXCEPTION = "javax.servlet.error.exception";
+
+ /**
+ * The name of the request attribute that should be set by the container
+ * when custom error-handling servlet or JSP page is invoked. The value of
+ * the attribute is of type {@code java.lang.Class}. See the chapter
+ * "Error Handling" in the Servlet Specification for details.
+ *
+ * @since Servlet 3.0
+ */
+ public static final String ERROR_EXCEPTION_TYPE = "javax.servlet.error.exception_type";
+
+ /**
+ * The name of the request attribute that should be set by the container
+ * when custom error-handling servlet or JSP page is invoked. The value of
+ * the attribute is of type {@code java.lang.String}. See the chapter
+ * "Error Handling" in the Servlet Specification for details.
+ *
+ * @since Servlet 3.0
+ */
+ public static final String ERROR_MESSAGE = "javax.servlet.error.message";
+
+ /**
+ * The name of the request attribute that should be set by the container
+ * when custom error-handling servlet or JSP page is invoked. The value of
+ * the attribute is of type {@code java.lang.String}. See the chapter
+ * "Error Handling" in the Servlet Specification for details.
+ *
+ * @since Servlet 3.0
+ */
+ public static final String ERROR_REQUEST_URI = "javax.servlet.error.request_uri";
+
+ /**
+ * The name of the request attribute that should be set by the container
+ * when custom error-handling servlet or JSP page is invoked. The value of
+ * the attribute is of type {@code java.lang.String}. See the chapter
+ * "Error Handling" in the Servlet Specification for details.
+ *
+ * @since Servlet 3.0
+ */
+ public static final String ERROR_SERVLET_NAME = "javax.servlet.error.servlet_name";
+
+ /**
+ * The name of the request attribute that should be set by the container
+ * when custom error-handling servlet or JSP page is invoked. The value of
+ * the attribute is of type {@code java.lang.Integer}. See the chapter
+ * "Error Handling" in the Servlet Specification for details.
+ *
+ * @since Servlet 3.0
+ */
+ public static final String ERROR_STATUS_CODE = "javax.servlet.error.status_code";
+
+ /**
+ * Forwards a request from a servlet to another resource (servlet, JSP file,
+ * or HTML file) on the server. This method allows one servlet to do
+ * preliminary processing of a request and another resource to generate the
+ * response.
+ *
+ * <p>
+ * For a <code>RequestDispatcher</code> obtained via
+ * <code>getRequestDispatcher()</code>, the <code>ServletRequest</code>
+ * object has its path elements and parameters adjusted to match the path of
+ * the target resource.
+ *
+ * <p>
+ * <code>forward</code> should be called before the response has been
+ * committed to the client (before response body output has been flushed).
+ * If the response already has been committed, this method throws an
+ * <code>IllegalStateException</code>. Uncommitted output in the response
+ * buffer is automatically cleared before the forward.
+ *
+ * <p>
+ * The request and response parameters must be either the same objects as
+ * were passed to the calling servlet's service method or be subclasses of
+ * the {@link ServletRequestWrapper} or {@link ServletResponseWrapper}
+ * classes that wrap them.
+ *
+ *
+ * @param request
+ * a {@link ServletRequest} object that represents the request
+ * the client makes of the servlet
+ *
+ * @param response
+ * a {@link ServletResponse} object that represents the response
+ * the servlet returns to the client
+ *
+ * @exception ServletException
+ * if the target resource throws this exception
+ *
+ * @exception IOException
+ * if the target resource throws this exception
+ *
+ * @exception IllegalStateException
+ * if the response was already committed
+ */
+ public void forward(ServletRequest request, ServletResponse response)
+ throws ServletException, IOException;
+
+ /**
+ * Includes the content of a resource (servlet, JSP page, HTML file) in the
+ * response. In essence, this method enables programmatic server-side
+ * includes.
+ *
+ * <p>
+ * The {@link ServletResponse} object has its path elements and parameters
+ * remain unchanged from the caller's. The included servlet cannot change
+ * the response status code or set headers; any attempt to make a change is
+ * ignored.
+ *
+ * <p>
+ * The request and response parameters must be either the same objects as
+ * were passed to the calling servlet's service method or be subclasses of
+ * the {@link ServletRequestWrapper} or {@link ServletResponseWrapper}
+ * classes that wrap them.
+ *
+ * @param request
+ * a {@link ServletRequest} object that contains the client's
+ * request
+ *
+ * @param response
+ * a {@link ServletResponse} object that contains the servlet's
+ * response
+ *
+ * @exception ServletException
+ * if the included resource throws this exception
+ *
+ * @exception IOException
+ * if the included resource throws this exception
+ */
+ public void include(ServletRequest request, ServletResponse response)
+ throws ServletException, IOException;
+}
projects / gigi.git / blobdiff