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

   1 package org.argeo.jcr.mvc;
   2
   3 import java.util.ArrayList;
   4 import java.util.Enumeration;
   5 import java.util.List;
   6 import java.util.Properties;
   7
   8 import javax.jcr.Repository;
   9 import javax.servlet.ServletConfig;
  10 import javax.servlet.ServletContext;
  11 import javax.servlet.ServletException;
  12 import javax.servlet.http.HttpServlet;
  13 import javax.servlet.http.HttpServletRequest;
  14
  15 import org.apache.commons.logging.Log;
  16 import org.apache.commons.logging.LogFactory;
  17 import org.argeo.ArgeoException;
  18 import org.argeo.jcr.RepositoryRegister;
  19 import org.springframework.beans.BeansException;
  20 import org.springframework.context.ApplicationContext;
  21 import org.springframework.context.ApplicationContextAware;
  22 import org.springframework.context.ConfigurableApplicationContext;
  23 import org.springframework.web.context.ServletContextAware;
  24 import org.springframework.web.servlet.HandlerExecutionChain;
  25 import org.springframework.web.servlet.HandlerMapping;
  26
  27 public abstract class MultipleRepositoryHandlerMapping implements
  28                 HandlerMapping, ApplicationContextAware, ServletContextAware {
  29         private final static Log log = LogFactory
  30                         .getLog(MultipleRepositoryHandlerMapping.class);
  31
  32         private final static String MKCOL = "MKCOL";
  33
  34         private ConfigurableApplicationContext applicationContext;
  35         private ServletContext servletContext;
  36
  37         private RepositoryRegister repositoryRegister;
  38
  39         /** Actually creates the servlet to be registered. */
  40         protected abstract HttpServlet createServlet(Repository repository,
  41                         String pathPrefix) throws ServletException;
  42
  43         public HandlerExecutionChain getHandler(HttpServletRequest request)
  44                         throws Exception {
  45                 if (log.isTraceEnabled()) {
  46                         log.trace("getContextPath=" + request.getContextPath());
  47                         log.trace("getServletPath=" + request.getServletPath());
  48                         log.trace("getPathInfo=" + request.getPathInfo());
  49                 }
  50
  51                 String pathInfo = request.getPathInfo();
  52
  53                 // tokenize path
  54                 // TODO factorize
  55                 List<String> tokens = new ArrayList<String>();
  56                 StringBuffer curr = new StringBuffer();
  57                 char[] arr = pathInfo.toCharArray();
  58                 chars: for (int i = 0; i < arr.length; i++) {
  59                         char c = arr[i];
  60                         if (c == '/') {
  61                                 if (i == 0 || (i == arr.length - 1))
  62                                         continue chars;
  63                                 if (curr.length() > 0) {
  64                                         tokens.add(curr.toString());
  65                                         curr = new StringBuffer();
  66                                 }
  67                         } else
  68                                 curr.append(c);
  69                 }
  70                 if (curr.length() > 0) {
  71                         tokens.add(curr.toString());
  72                         curr = new StringBuffer();
  73                 }
  74
  75                 // check if repository can be found
  76                 if (tokens.size() == 0
  77                                 || (tokens.size() == 1 && tokens.get(0).equals("")))
  78                         return null;
  79                 // MKCOL on repository or root node doesn't make sense
  80                 if ((tokens.size() == 1 || tokens.size() == 2)
  81                                 && request.getMethod().equals(MKCOL))
  82                         return null;
  83                 String repositoryName = extractRepositoryName(tokens);
  84                 String pathPrefix = request.getServletPath() + '/' + repositoryName;
  85                 String beanName = pathPrefix;
  86
  87                 if (!applicationContext.containsBean(beanName)) {
  88                         Repository repository = repositoryRegister.getRepositories().get(
  89                                         repositoryName);
  90                         HttpServlet servlet = createServlet(repository, pathPrefix);
  91                         applicationContext.getBeanFactory().registerSingleton(beanName,
  92                                         servlet);
  93                         // TODO: unregister it as well
  94                 }
  95                 HttpServlet remotingServlet = (HttpServlet) applicationContext
  96                                 .getBean(beanName);
  97                 HandlerExecutionChain hec = new HandlerExecutionChain(remotingServlet);
  98                 return hec;
  99         }
 100
 101         /** The repository name is the first part of the path info */
 102         protected String extractRepositoryName(List<String> pathTokens) {
 103                 StringBuffer currName = new StringBuffer("");
 104                 for (String token : pathTokens) {
 105                         currName.append(token);
 106                         if (repositoryRegister.getRepositories().containsKey(
 107                                         currName.toString()))
 108                                 return currName.toString();
 109                         currName.append('/');
 110                 }
 111                 throw new ArgeoException("No repository can be found for request "
 112                                 + pathTokens);
 113         }
 114
 115         public void setApplicationContext(ApplicationContext applicationContext)
 116                         throws BeansException {
 117                 this.applicationContext = (ConfigurableApplicationContext) applicationContext;
 118         }
 119
 120         public void setServletContext(ServletContext servletContext) {
 121                 this.servletContext = servletContext;
 122         }
 123
 124         public void setRepositoryRegister(RepositoryRegister repositoryRegister) {
 125                 this.repositoryRegister = repositoryRegister;
 126         }
 127
 128         protected class DelegatingServletConfig implements ServletConfig {
 129                 private String name;
 130                 private Properties initParameters;
 131
 132                 public DelegatingServletConfig(String name, Properties initParameters) {
 133                         super();
 134                         this.name = name;
 135                         this.initParameters = initParameters;
 136                 }
 137
 138                 public String getServletName() {
 139                         return name;
 140                 }
 141
 142                 public ServletContext getServletContext() {
 143                         return servletContext;
 144                 }
 145
 146                 public String getInitParameter(String paramName) {
 147                         return initParameters.getProperty(paramName);
 148                 }
 149
 150                 @SuppressWarnings("rawtypes")
 151                 public Enumeration getInitParameterNames() {
 152                         return initParameters.keys();
 153                 }
 154         }
 155 }