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

   1 package org.argeo.slc.core.execution.xml;
   2
   3 import java.util.ArrayList;
   4 import java.util.List;
   5
   6 import org.argeo.slc.SlcException;
   7 import org.argeo.slc.core.execution.DefaultExecutionFlow;
   8 import org.argeo.slc.execution.ExecutionFlow;
   9 import org.springframework.beans.factory.BeanDefinitionStoreException;
  10 import org.springframework.beans.factory.config.RuntimeBeanReference;
  11 import org.springframework.beans.factory.support.AbstractBeanDefinition;
  12 import org.springframework.beans.factory.support.BeanDefinitionBuilder;
  13 import org.springframework.beans.factory.support.ManagedList;
  14 import org.springframework.beans.factory.support.ManagedMap;
  15 import org.springframework.beans.factory.xml.AbstractSingleBeanDefinitionParser;
  16 import org.springframework.beans.factory.xml.ParserContext;
  17 import org.springframework.util.StringUtils;
  18 import org.springframework.util.xml.DomUtils;
  19 import org.w3c.dom.Element;
  20 import org.w3c.dom.Node;
  21 import org.w3c.dom.NodeList;
  22
  23 public class FlowBeanDefinitionParser extends
  24                 AbstractSingleBeanDefinitionParser {
  25         // private Log log = LogFactory.getLog(FlowBeanDefinitionParser.class);
  26
  27         @SuppressWarnings("unchecked")
  28         @Override
  29         protected void doParse(Element element, ParserContext parserContext,
  30                         BeanDefinitionBuilder builder) {
  31                 String path = element.getAttribute("path");
  32                 if (StringUtils.hasText(path))
  33                         builder.addPropertyValue("path", path);
  34
  35                 String spec = element.getAttribute("spec");
  36                 if (StringUtils.hasText(spec))
  37                         builder.getBeanDefinition().getConstructorArgumentValues()
  38                                         .addGenericArgumentValue(new RuntimeBeanReference(spec));
  39
  40                 String abstrac = element.getAttribute("abstract");
  41                 if (StringUtils.hasText(abstrac))
  42                         builder.setAbstract(Boolean.parseBoolean(abstrac));
  43
  44                 String parent = element.getAttribute("parent");
  45                 if (StringUtils.hasText(parent))
  46                         builder.setParentName(parent);
  47
  48                 builder.getBeanDefinition().setDescription(
  49                                 DomUtils.getChildElementValueByTagName(element, "description"));
  50
  51                 List<Element> execElems = new ArrayList<Element>();
  52                 List<Element> argsElems = new ArrayList<Element>();
  53                 NodeList nodeList = element.getChildNodes();
  54                 for (int i = 0; i < nodeList.getLength(); i++) {
  55                         Node node = nodeList.item(i);
  56                         if (node instanceof Element) {
  57                                 if (DomUtils.nodeNameEquals(node, "arg"))
  58                                         argsElems.add((Element) node);
  59                                 else if (!DomUtils.nodeNameEquals(node, "description"))
  60                                         execElems.add((Element) node);
  61                         }
  62                 }
  63
  64                 // Arguments
  65                 if (argsElems.size() != 0) {
  66                         ManagedMap args = new ManagedMap(argsElems.size());
  67                         for (Element argElem : argsElems) {
  68                                 Object value = NamespaceUtils.parseValue(argElem,
  69                                                 parserContext, builder.getBeanDefinition(), null);
  70                                 if (value != null)
  71                                         args.put(argElem.getAttribute("name"), value);
  72                                 else
  73                                         throw new SlcException("No value defined.");
  74                         }
  75                         builder.getBeanDefinition().getConstructorArgumentValues()
  76                                         .addGenericArgumentValue(args);
  77                 }
  78
  79                 // Executables
  80                 if (execElems.size() != 0) {
  81                         ManagedList executables = new ManagedList(execElems.size());
  82                         for (Element child : execElems) {
  83                                 // child validity check is performed in xsd
  84                                 executables.add(NamespaceUtils.parseBeanOrReference(child,
  85                                                 parserContext, builder.getBeanDefinition()));
  86                         }
  87                         if (executables.size() > 0)
  88                                 builder.addPropertyValue("executables", executables);
  89                 }
  90         }
  91
  92         @SuppressWarnings("unchecked")
  93         @Override
  94         protected Class<? extends ExecutionFlow> getBeanClass(Element element) {
  95                 String clss = element.getAttribute("class");
  96                 if (StringUtils.hasText(clss))
  97                         // TODO: check that it actually works
  98                         try {
  99                                 return (Class<? extends ExecutionFlow>) getClass()
 100                                                 .getClassLoader().loadClass(clss);
 101                         } catch (ClassNotFoundException e) {
 102                                 try {
 103                                         return (Class<? extends ExecutionFlow>) Thread
 104                                                         .currentThread().getContextClassLoader().loadClass(
 105                                                                         clss);
 106                                 } catch (ClassNotFoundException e1) {
 107                                         throw new SlcException("Cannot load class " + clss, e);
 108                                 }
 109                         }
 110                 else
 111                         return DefaultExecutionFlow.class;
 112         }
 113
 114         // parse nested bean definition
 115         // private Object parseBeanReference(Element element,
 116         // ParserContext parserContext, BeanDefinitionBuilder builder) {
 117         // return parserContext.getDelegate().parsePropertySubElement(element,
 118         // builder.getBeanDefinition());
 119         // }
 120
 121         @Override
 122         protected String resolveId(Element element,
 123                         AbstractBeanDefinition definition, ParserContext parserContext)
 124                         throws BeanDefinitionStoreException {
 125                 String name = element.getAttribute("name");
 126                 if (StringUtils.hasText(name)) {
 127                         return name;
 128                 } else {
 129                         return super.resolveId(element, definition, parserContext);
 130                 }
 131         }
 132
 133         protected boolean shouldGenerateIdAsFallback() {
 134                 return true;
 135         }
 136
 137 }