org.argeo.server.jcr.mvc/src/org/argeo/jcr/mvc/MultipleRepositoryHandlerMapping.java

   1 /*
   2  * Copyright (C) 2007-2012 Argeo GmbH
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.argeo.jcr.mvc;
  17
  18 import java.util.Enumeration;
  19 import java.util.Properties;
  20 import java.util.StringTokenizer;
  21
  22 import javax.jcr.Repository;
  23 import javax.jcr.RepositoryFactory;
  24 import javax.servlet.ServletConfig;
  25 import javax.servlet.ServletContext;
  26 import javax.servlet.ServletException;
  27 import javax.servlet.http.HttpServlet;
  28 import javax.servlet.http.HttpServletRequest;
  29
  30 import org.apache.commons.logging.Log;
  31 import org.apache.commons.logging.LogFactory;
  32 import org.argeo.jcr.ArgeoJcrConstants;
  33 import org.argeo.jcr.ArgeoJcrUtils;
  34 import org.springframework.beans.BeansException;
  35 import org.springframework.context.ApplicationContext;
  36 import org.springframework.context.ApplicationContextAware;
  37 import org.springframework.context.ConfigurableApplicationContext;
  38 import org.springframework.web.context.ServletContextAware;
  39 import org.springframework.web.servlet.HandlerExecutionChain;
  40 import org.springframework.web.servlet.HandlerMapping;
  41
  42 /** Handles multiple JCR servers with a single servlet. */
  43 public abstract class MultipleRepositoryHandlerMapping implements
  44                 HandlerMapping, ApplicationContextAware, ServletContextAware {
  45         private final static Log log = LogFactory
  46                         .getLog(MultipleRepositoryHandlerMapping.class);
  47
  48         private final static String MKCOL = "MKCOL";
  49
  50         private ConfigurableApplicationContext applicationContext;
  51         private ServletContext servletContext;
  52
  53         // private RepositoryRegister repositoryRegister;
  54         private RepositoryFactory repositoryFactory;
  55
  56         /** Actually creates the servlet to be registered. */
  57         protected abstract HttpServlet createServlet(Repository repository,
  58                         String pathPrefix) throws ServletException;
  59
  60         public HandlerExecutionChain getHandler(HttpServletRequest request)
  61                         throws Exception {
  62                 if (log.isTraceEnabled()) {
  63                         log.trace("getContextPath=" + request.getContextPath());
  64                         log.trace("getServletPath=" + request.getServletPath());
  65                         log.trace("getPathInfo=" + request.getPathInfo());
  66                 }
  67
  68                 String pathInfo = request.getPathInfo();
  69                 String repositoryAlias = extractRepositoryAlias(pathInfo);
  70                 if (repositoryAlias.equals(""))
  71                         return null;
  72
  73                 // MKCOL on repository or root node doesn't make sense
  74                 // and causes issues
  75                 if (request.getMethod().equals(MKCOL)) {
  76                         StringTokenizer st = new StringTokenizer(pathInfo, "/");
  77                         if (!st.hasMoreTokens())
  78                                 return null;
  79                         st.nextToken();// repository
  80                         if (!st.hasMoreTokens())
  81                                 return null;
  82                         st.nextToken();// workspace
  83                         if (!st.hasMoreTokens())
  84                                 return null;
  85                 }
  86
  87                 request.setAttribute(ArgeoJcrConstants.JCR_REPOSITORY_ALIAS,
  88                                 repositoryAlias);
  89                 String pathPrefix = request.getServletPath() + '/' + repositoryAlias;
  90                 String beanName = pathPrefix;
  91
  92                 if (!applicationContext.containsBean(beanName)) {
  93                         Repository repository = ArgeoJcrUtils.getRepositoryByAlias(
  94                                         repositoryFactory, repositoryAlias);
  95                         // Repository repository = repositoryRegister.getRepositories().get(
  96                         // repositoryAlias);
  97                         HttpServlet servlet = createServlet(repository, pathPrefix);
  98                         applicationContext.getBeanFactory().registerSingleton(beanName,
  99                                         servlet);
 100                         // TODO: unregister it as well
 101                 }
 102                 HttpServlet remotingServlet = (HttpServlet) applicationContext
 103                                 .getBean(beanName);
 104                 HandlerExecutionChain hec = new HandlerExecutionChain(remotingServlet);
 105                 return hec;
 106         }
 107
 108         /** Returns the first two token of the path */
 109         // protected String[] extractPrefix(String pathInfo) {
 110         // String[] res = new String[2];
 111         // StringTokenizer st = new StringTokenizer(pathInfo, "/");
 112         // if (st.hasMoreTokens())
 113         // res[0] = st.nextToken();
 114         // if (st.hasMoreTokens())
 115         // res[1] = st.nextToken();
 116         // return res;
 117         // }
 118
 119         /** Returns the first token of the path */
 120         protected String extractRepositoryAlias(String pathInfo) {
 121                 StringBuffer buf = new StringBuffer();
 122                 for (int i = 1; i < pathInfo.length(); i++) {
 123                         char c = pathInfo.charAt(i);
 124                         if (c == '/')
 125                                 break;
 126                         buf.append(c);
 127                 }
 128                 return buf.toString();
 129         }
 130
 131         /** The repository name is the first part of the path info */
 132         // protected String extractRepositoryName(List<String> pathTokens) {
 133         // StringBuffer currName = new StringBuffer("");
 134         // for (String token : pathTokens) {
 135         // currName.append(token);
 136         // if (repositoryRegister.getRepositories().containsKey(
 137         // currName.toString()))
 138         // return currName.toString();
 139         // currName.append('/');
 140         // }
 141         // throw new ArgeoException("No repository can be found for request "
 142         // + pathTokens);
 143         // }
 144
 145         public void setApplicationContext(ApplicationContext applicationContext)
 146                         throws BeansException {
 147                 this.applicationContext = (ConfigurableApplicationContext) applicationContext;
 148         }
 149
 150         public void setServletContext(ServletContext servletContext) {
 151                 this.servletContext = servletContext;
 152         }
 153
 154         // public void setRepositoryRegister(RepositoryRegister repositoryRegister)
 155         // {
 156         // this.repositoryRegister = repositoryRegister;
 157         // }
 158
 159         public void setRepositoryFactory(RepositoryFactory repositoryFactory) {
 160                 this.repositoryFactory = repositoryFactory;
 161         }
 162
 163         protected class DelegatingServletConfig implements ServletConfig {
 164                 private String name;
 165                 private Properties initParameters;
 166
 167                 public DelegatingServletConfig(String name, Properties initParameters) {
 168                         super();
 169                         this.name = name;
 170                         this.initParameters = initParameters;
 171                 }
 172
 173                 public String getServletName() {
 174                         return name;
 175                 }
 176
 177                 public ServletContext getServletContext() {
 178                         return servletContext;
 179                 }
 180
 181                 public String getInitParameter(String paramName) {
 182                         return initParameters.getProperty(paramName);
 183                 }
 184
 185                 @SuppressWarnings("rawtypes")
 186                 public Enumeration getInitParameterNames() {
 187                         return initParameters.keys();
 188                 }
 189         }
 190 }