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Tiles request implementation for Servlet technology.
/*
* $Id: ServletRequest.java 1375743 2012-08-21 20:05:58Z nlebas $
*
* 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 org.apache.tiles.request.servlet;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.Writer;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.tiles.request.AbstractClientRequest;
import org.apache.tiles.request.ApplicationContext;
import org.apache.tiles.request.attribute.Addable;
import org.apache.tiles.request.collection.HeaderValuesMap;
import org.apache.tiles.request.collection.ReadOnlyEnumerationMap;
import org.apache.tiles.request.collection.ScopeMap;
import org.apache.tiles.request.servlet.extractor.ParameterExtractor;
import org.apache.tiles.request.servlet.extractor.RequestScopeExtractor;
import org.apache.tiles.request.servlet.extractor.HeaderExtractor;
import org.apache.tiles.request.servlet.extractor.SessionScopeExtractor;
/**
* Servlet-based implementation of the TilesApplicationContext interface.
*
* @version $Rev: 1375743 $ $Date: 2012-08-21 22:05:58 +0200 (Tue, 21 Aug 2012) $
*/
public class ServletRequest extends AbstractClientRequest {
/**
* The native available scopes: request, session and application.
*/
private static final List SCOPES
= Collections.unmodifiableList(Arrays.asList(REQUEST_SCOPE, "session", APPLICATION_SCOPE));
/**
* The request object to use.
*/
private HttpServletRequest request;
/**
* The response object to use.
*/
private HttpServletResponse response;
/**
* The response output stream, lazily initialized.
*/
private OutputStream outputStream;
/**
* The response writer, lazily initialized.
*/
private PrintWriter writer;
/**
* The lazily instantiated Map of header name-value
* combinations (immutable).
*/
private Map header = null;
/**
* The lazily instantiated Map of header name-value
* combinations (write-only).
*/
private Addable responseHeaders = null;
/**
* The lazily instantitated Map of header name-values
* combinations (immutable).
*/
private Map headerValues = null;
/**
* The lazily instantiated Map of request
* parameter name-value.
*/
private Map param = null;
/**
* The lazily instantiated Map of request scope
* attributes.
*/
private Map requestScope = null;
/**
* The lazily instantiated Map of session scope
* attributes.
*/
private Map sessionScope = null;
/**
* Creates a new instance of ServletTilesRequestContext.
*
* @param applicationContext The application context.
* @param request The request object.
* @param response The response object.
*/
public ServletRequest(
ApplicationContext applicationContext,
HttpServletRequest request, HttpServletResponse response) {
super(applicationContext);
this.request = request;
this.response = response;
}
/** {@inheritDoc} */
public Map getHeader() {
if ((header == null) && (request != null)) {
header = new ReadOnlyEnumerationMap(new HeaderExtractor(request, null));
}
return (header);
}
/** {@inheritDoc} */
public Addable getResponseHeaders() {
if ((responseHeaders == null) && (response != null)) {
responseHeaders = new HeaderExtractor(null, response);
}
return (responseHeaders);
}
/** {@inheritDoc} */
public Map getHeaderValues() {
if ((headerValues == null) && (request != null)) {
headerValues = new HeaderValuesMap(new HeaderExtractor(request, response));
}
return (headerValues);
}
/** {@inheritDoc} */
public Map getParam() {
if ((param == null) && (request != null)) {
param = new ReadOnlyEnumerationMap(new ParameterExtractor(request));
}
return (param);
}
/** {@inheritDoc} */
@SuppressWarnings("unchecked")
public Map getParamValues() {
return request.getParameterMap();
}
@Override
public Map getContext(String scope) {
if(REQUEST_SCOPE.equals(scope)){
return getRequestScope();
}else if("session".equals(scope)){
return getSessionScope();
}else if(APPLICATION_SCOPE.equals(scope)){
return getApplicationScope();
}
throw new IllegalArgumentException(scope + " does not exist. Call getAvailableScopes() first to check.");
}
/** {@inheritDoc} */
public Map getRequestScope() {
if ((requestScope == null) && (request != null)) {
requestScope = new ScopeMap(new RequestScopeExtractor(request));
}
return (requestScope);
}
/** {@inheritDoc} */
public Map getSessionScope() {
if ((sessionScope == null) && (request != null)) {
sessionScope = new ScopeMap(new SessionScopeExtractor(request));
}
return (sessionScope);
}
@Override
public List getAvailableScopes() {
return SCOPES;
}
/** {@inheritDoc} */
public void doForward(String path) throws IOException {
if (response.isCommitted()) {
doInclude(path);
} else {
forward(path);
}
}
/** {@inheritDoc} */
public void doInclude(String path) throws IOException {
RequestDispatcher rd = request.getRequestDispatcher(path);
if (rd == null) {
throw new IOException("No request dispatcher returned for path '"
+ path + "'");
}
try {
rd.include(request, response);
} catch (ServletException ex) {
throw ServletUtil.wrapServletException(ex, "ServletException including path '"
+ path + "'.");
}
}
/**
* Forwards to a path.
*
* @param path The path to forward to.
* @throws IOException If something goes wrong during the operation.
*/
private void forward(String path) throws IOException {
RequestDispatcher rd = request.getRequestDispatcher(path);
if (rd == null) {
throw new IOException("No request dispatcher returned for path '"
+ path + "'");
}
try {
rd.forward(request, response);
} catch (ServletException ex) {
throw ServletUtil.wrapServletException(ex, "ServletException including path '"
+ path + "'.");
}
}
/** {@inheritDoc} */
public OutputStream getOutputStream() throws IOException {
if (outputStream == null) {
outputStream = response.getOutputStream();
}
return outputStream;
}
/** {@inheritDoc} */
public Writer getWriter() throws IOException {
return getPrintWriter();
}
/** {@inheritDoc} */
public PrintWriter getPrintWriter() throws IOException {
if (writer == null) {
writer = response.getWriter();
}
return writer;
}
/** {@inheritDoc} */
public boolean isResponseCommitted() {
return response.isCommitted();
}
/** {@inheritDoc} */
public void setContentType(String contentType) {
response.setContentType(contentType);
}
/** {@inheritDoc} */
public Locale getRequestLocale() {
return request.getLocale();
}
public HttpServletRequest getRequest() {
return request;
}
public HttpServletResponse getResponse() {
return response;
}
/** {@inheritDoc} */
public boolean isUserInRole(String role) {
return request.isUserInRole(role);
}
}