runtime/org.argeo.slc.core/src/main/java/org/argeo/slc/core/execution/MapExecutionContext.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.slc.core.execution;
  17
  18 import java.util.Collections;
  19 import java.util.Date;
  20 import java.util.HashMap;
  21 import java.util.Map;
  22 import java.util.UUID;
  23
  24 import org.argeo.slc.SlcException;
  25 import org.argeo.slc.execution.ExecutionContext;
  26 import org.springframework.beans.BeanWrapper;
  27 import org.springframework.beans.BeanWrapperImpl;
  28 import org.springframework.beans.BeansException;
  29 import org.springframework.context.ApplicationContext;
  30 import org.springframework.context.ApplicationContextAware;
  31
  32 public class MapExecutionContext implements ExecutionContext,
  33                 ApplicationContextAware {
  34         private final Map<String, Object> variables = Collections
  35                         .synchronizedMap(new HashMap<String, Object>());
  36
  37         private final String uuid;
  38
  39         private ApplicationContext applicationContext;
  40
  41         public MapExecutionContext() {
  42                 uuid = UUID.randomUUID().toString();
  43                 variables.put(VAR_EXECUTION_CONTEXT_ID, uuid);
  44                 variables.put(VAR_EXECUTION_CONTEXT_CREATION_DATE, new Date());
  45         }
  46
  47         public void setVariable(String key, Object value) {
  48                 // check if we do not refer to a bean
  49                 int lastInd = key.lastIndexOf('.');
  50                 if (applicationContext != null && lastInd > 0) {
  51                         String beanName = key.substring(0, lastInd);
  52                         String propertyName = key.substring(lastInd + 1);
  53                         if (applicationContext.containsBean(beanName)) {
  54                                 BeanWrapper beanWrapper = new BeanWrapperImpl(
  55                                                 applicationContext.getBean(beanName));
  56                                 if (!beanWrapper.isWritableProperty(propertyName))
  57                                         throw new SlcException("No writable property "
  58                                                         + propertyName + " in bean " + beanName);
  59                                 beanWrapper.setPropertyValue(propertyName, value);
  60                         }
  61                 }
  62
  63                 variables.put(key, value);
  64         }
  65
  66         public Object getVariable(String key) {
  67                 // check if we do not refer to a bean
  68                 int lastInd = key.lastIndexOf('.');
  69                 if (applicationContext != null && lastInd > 0) {
  70                         String beanName = key.substring(0, lastInd);
  71                         String propertyName = key.substring(lastInd + 1);
  72                         if (applicationContext.containsBean(beanName)) {
  73                                 BeanWrapper beanWrapper = new BeanWrapperImpl(
  74                                                 applicationContext.getBean(beanName));
  75                                 if (!beanWrapper.isReadableProperty(propertyName))
  76                                         throw new SlcException("No readable property "
  77                                                         + propertyName + " in bean " + beanName);
  78                                 Object obj = beanWrapper.getPropertyValue(propertyName);
  79                                 return obj;
  80                         }
  81                 }
  82
  83                 Object value = variables.get(key);
  84                 // try system property in last resort
  85                 if (value == null)
  86                         value = System.getProperty(key);
  87                 return value;
  88         }
  89
  90         public String getUuid() {
  91                 return uuid;
  92         }
  93
  94         @Override
  95         public boolean equals(Object obj) {
  96                 if (obj instanceof ExecutionContext)
  97                         return uuid.equals(((ExecutionContext) obj).getUuid());
  98                 return false;
  99         }
 100
 101         @Override
 102         public String toString() {
 103                 return getClass().getSimpleName() + "#" + uuid;
 104         }
 105
 106         public void setApplicationContext(ApplicationContext applicationContext)
 107                         throws BeansException {
 108                 this.applicationContext = applicationContext;
 109         }
 110
 111 }