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    1   /*
    2    * $Id: StrutsObjectFactory.java 506198 2007-02-12 00:57:44Z husted $
    3    *
    4    * Licensed to the Apache Software Foundation (ASF) under one
    5    * or more contributor license agreements.  See the NOTICE file
    6    * distributed with this work for additional information
    7    * regarding copyright ownership.  The ASF licenses this file
    8    * to you under the Apache License, Version 2.0 (the
    9    * "License"); you may not use this file except in compliance
    10   * with the License.  You may obtain a copy of the License at
    11   *
    12   *  http://www.apache.org/licenses/LICENSE-2.0
    13   *
    14   * Unless required by applicable law or agreed to in writing,
    15   * software distributed under the License is distributed on an
    16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    17   * KIND, either express or implied.  See the License for the
    18   * specific language governing permissions and limitations
    19   * under the License.
    20   */
    21  // Copyright 2006 Google Inc. All Rights Reserved.
    22
    23  package org.apache.struts2.impl;
    24
    25  import com.opensymphony.xwork2.ObjectFactory;
    26  import com.opensymphony.xwork2.Result;
    27  import com.opensymphony.xwork2.config.ConfigurationException;
    28  import com.opensymphony.xwork2.config.entities.InterceptorConfig;
    29  import com.opensymphony.xwork2.config.entities.ResultConfig;
    30  import com.opensymphony.xwork2.interceptor.Interceptor;
    31  import com.opensymphony.xwork2.util.OgnlUtil;
    32
    33  import java.util.HashMap;
    34  import java.util.Map;
    35
    36  public class StrutsObjectFactory extends ObjectFactory {
    37
    38      public Interceptor buildInterceptor(InterceptorConfig interceptorConfig, Map refParams)
    39              throws ConfigurationException {
    40          String className = interceptorConfig.getClassName();
    41
    42          Map<String, String> params = new HashMap<String, String>();
    43          Map typeParams = interceptorConfig.getParams();
    44          if (typeParams != null && !typeParams.isEmpty())
    45              params.putAll(typeParams);
    46          if (refParams != null && !refParams.isEmpty())
    47              params.putAll(refParams);
    48          params.putAll(refParams);
    49
    50          try {
    51              // interceptor instances are long-lived and used across user sessions, so don't try to pass in any extra
    52              // context
    53              Object o = buildBean(className, null);
    54              OgnlUtil.setProperties(params, o);
    55
    56              if (o instanceof Interceptor) {
    57                  Interceptor interceptor = (Interceptor) o;
    58                  interceptor.init();
    59                  return interceptor;
    60              }
    61
    62  // This is for the new API:
    63  //            if (o instanceof org.apache.struts2.spi.Interceptor)
    64  //                return new InterceptorAdapter((org.apache.struts2.spi.Interceptor) o);
    65
    66              throw new ConfigurationException(
    67                      "Class [" + className + "] does not implement Interceptor", interceptorConfig);
    68          } catch (InstantiationException e) {
    69              throw new ConfigurationException(
    70                      "Unable to instantiate an instance of Interceptor class [" + className + "].",
    71                      e, interceptorConfig);
    72          } catch (IllegalAccessException e) {
    73              throw new ConfigurationException(
    74                      "IllegalAccessException while attempting to instantiate an instance of Interceptor class ["
    75                              + className + "].",
    76                      e, interceptorConfig);
    77          } catch (Exception e) {
    78              throw new ConfigurationException(
    79                      "Caught Exception while registering Interceptor class " + className,
    80                      e, interceptorConfig);
    81          } catch (NoClassDefFoundError e) {
    82              throw new ConfigurationException(
    83                      "Could not load class " + className
    84                              + ". Perhaps it exists but certain dependencies are not available?",
    85                      e, interceptorConfig);
    86          }
    87      }
    88
    89      public Result buildResult(ResultConfig resultConfig, Map extraContext) throws Exception {
    90          String resultClassName = resultConfig.getClassName();
    91          if (resultClassName == null)
    92              return null;
    93
    94          Object result = buildBean(resultClassName, extraContext);
    95          OgnlUtil.setProperties(resultConfig.getParams(), result, extraContext);
    96
    97          if (result instanceof Result)
    98              return (Result) result;
    99
    100 // This is for the new API:
    101 //        if (result instanceof org.apache.struts2.spi.Result)
    102 //            return new ResultAdapter((org.apache.struts2.spi.Result) result);
    103
    104         throw new ConfigurationException(result.getClass().getName() + " does not implement Result.");
    105     }
    106 }