runtime/org.argeo.slc.core/src/main/java/org/argeo/slc/core/execution/xml/FlowBeanDefinitionParser.java

   1 /*
   2  * Copyright (C) 2007-2012 Mathieu Baudier
   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.xml;
  17
  18 import java.util.ArrayList;
  19 import java.util.List;
  20
  21 import org.argeo.slc.SlcException;
  22 import org.argeo.slc.core.execution.DefaultExecutionFlow;
  23 import org.argeo.slc.execution.ExecutionFlow;
  24 import org.springframework.beans.factory.BeanDefinitionStoreException;
  25 import org.springframework.beans.factory.config.RuntimeBeanReference;
  26 import org.springframework.beans.factory.support.AbstractBeanDefinition;
  27 import org.springframework.beans.factory.support.BeanDefinitionBuilder;
  28 import org.springframework.beans.factory.support.ManagedList;
  29 import org.springframework.beans.factory.support.ManagedMap;
  30 import org.springframework.beans.factory.xml.AbstractSingleBeanDefinitionParser;
  31 import org.springframework.beans.factory.xml.ParserContext;
  32 import org.springframework.util.StringUtils;
  33 import org.springframework.util.xml.DomUtils;
  34 import org.w3c.dom.Element;
  35 import org.w3c.dom.Node;
  36 import org.w3c.dom.NodeList;
  37
  38 public class FlowBeanDefinitionParser extends
  39                 AbstractSingleBeanDefinitionParser {
  40         // private Log log = LogFactory.getLog(FlowBeanDefinitionParser.class);
  41
  42         @SuppressWarnings("unchecked")
  43         @Override
  44         protected void doParse(Element element, ParserContext parserContext,
  45                         BeanDefinitionBuilder builder) {
  46                 String path = element.getAttribute("path");
  47                 if (StringUtils.hasText(path))
  48                         builder.addPropertyValue("path", path);
  49
  50                 String spec = element.getAttribute("spec");
  51                 if (StringUtils.hasText(spec))
  52                         builder.getBeanDefinition().getConstructorArgumentValues()
  53                                         .addGenericArgumentValue(new RuntimeBeanReference(spec));
  54
  55                 String abstrac = element.getAttribute("abstract");
  56                 if (StringUtils.hasText(abstrac))
  57                         builder.setAbstract(Boolean.parseBoolean(abstrac));
  58
  59                 String parent = element.getAttribute("parent");
  60                 if (StringUtils.hasText(parent))
  61                         builder.setParentName(parent);
  62
  63                 builder.getBeanDefinition().setDescription(
  64                                 DomUtils.getChildElementValueByTagName(element, "description"));
  65
  66                 List<Element> execElems = new ArrayList<Element>();
  67                 List<Element> argsElems = new ArrayList<Element>();
  68                 NodeList nodeList = element.getChildNodes();
  69                 for (int i = 0; i < nodeList.getLength(); i++) {
  70                         Node node = nodeList.item(i);
  71                         if (node instanceof Element) {
  72                                 if (DomUtils.nodeNameEquals(node, "arg"))
  73                                         argsElems.add((Element) node);
  74                                 else if (!DomUtils.nodeNameEquals(node, "description"))
  75                                         execElems.add((Element) node);
  76                         }
  77                 }
  78
  79                 // Arguments
  80                 if (argsElems.size() != 0) {
  81                         ManagedMap args = new ManagedMap(argsElems.size());
  82                         for (Element argElem : argsElems) {
  83                                 Object value = NamespaceUtils.parseValue(argElem,
  84                                                 parserContext, builder.getBeanDefinition(), null);
  85                                 if (value != null)
  86                                         args.put(argElem.getAttribute("name"), value);
  87                                 else
  88                                         throw new SlcException("No value defined.");
  89                         }
  90                         builder.getBeanDefinition().getConstructorArgumentValues()
  91                                         .addGenericArgumentValue(args);
  92                 }
  93
  94                 // Executables
  95                 if (execElems.size() != 0) {
  96                         ManagedList executables = new ManagedList(execElems.size());
  97                         for (Element child : execElems) {
  98                                 // child validity check is performed in xsd
  99                                 executables.add(NamespaceUtils.parseBeanOrReference(child,
 100                                                 parserContext, builder.getBeanDefinition()));
 101                         }
 102                         if (executables.size() > 0)
 103                                 builder.addPropertyValue("executables", executables);
 104                 }
 105         }
 106
 107         @SuppressWarnings("unchecked")
 108         @Override
 109         protected Class<? extends ExecutionFlow> getBeanClass(Element element) {
 110                 String clss = element.getAttribute("class");
 111                 if (StringUtils.hasText(clss))
 112                         // TODO: check that it actually works
 113                         try {
 114                                 return (Class<? extends ExecutionFlow>) getClass()
 115                                                 .getClassLoader().loadClass(clss);
 116                         } catch (ClassNotFoundException e) {
 117                                 try {
 118                                         return (Class<? extends ExecutionFlow>) Thread
 119                                                         .currentThread().getContextClassLoader().loadClass(
 120                                                                         clss);
 121                                 } catch (ClassNotFoundException e1) {
 122                                         throw new SlcException("Cannot load class " + clss, e);
 123                                 }
 124                         }
 125                 else
 126                         return DefaultExecutionFlow.class;
 127         }
 128
 129         // parse nested bean definition
 130         // private Object parseBeanReference(Element element,
 131         // ParserContext parserContext, BeanDefinitionBuilder builder) {
 132         // return parserContext.getDelegate().parsePropertySubElement(element,
 133         // builder.getBeanDefinition());
 134         // }
 135
 136         @Override
 137         protected String resolveId(Element element,
 138                         AbstractBeanDefinition definition, ParserContext parserContext)
 139                         throws BeanDefinitionStoreException {
 140                 String name = element.getAttribute("name");
 141                 if (StringUtils.hasText(name)) {
 142                         return name;
 143                 } else {
 144                         return super.resolveId(element, definition, parserContext);
 145                 }
 146         }
 147
 148         protected boolean shouldGenerateIdAsFallback() {
 149                 return true;
 150         }
 151
 152 }