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

   1 /*
   2  * Copyright (C) 2010 Mathieu Baudier <mbaudier@argeo.org>
   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
  17 package org.argeo.slc.core.execution.xml;
  18
  19 import java.util.ArrayList;
  20 import java.util.List;
  21
  22 import org.argeo.slc.SlcException;
  23 import org.argeo.slc.core.execution.DefaultExecutionFlow;
  24 import org.argeo.slc.execution.ExecutionFlow;
  25 import org.springframework.beans.factory.BeanDefinitionStoreException;
  26 import org.springframework.beans.factory.config.RuntimeBeanReference;
  27 import org.springframework.beans.factory.support.AbstractBeanDefinition;
  28 import org.springframework.beans.factory.support.BeanDefinitionBuilder;
  29 import org.springframework.beans.factory.support.ManagedList;
  30 import org.springframework.beans.factory.support.ManagedMap;
  31 import org.springframework.beans.factory.xml.AbstractSingleBeanDefinitionParser;
  32 import org.springframework.beans.factory.xml.ParserContext;
  33 import org.springframework.util.StringUtils;
  34 import org.springframework.util.xml.DomUtils;
  35 import org.w3c.dom.Element;
  36 import org.w3c.dom.Node;
  37 import org.w3c.dom.NodeList;
  38
  39 public class FlowBeanDefinitionParser extends
  40                 AbstractSingleBeanDefinitionParser {
  41         // private Log log = LogFactory.getLog(FlowBeanDefinitionParser.class);
  42
  43         @SuppressWarnings("unchecked")
  44         @Override
  45         protected void doParse(Element element, ParserContext parserContext,
  46                         BeanDefinitionBuilder builder) {
  47                 String path = element.getAttribute("path");
  48                 if (StringUtils.hasText(path))
  49                         builder.addPropertyValue("path", path);
  50
  51                 String spec = element.getAttribute("spec");
  52                 if (StringUtils.hasText(spec))
  53                         builder.getBeanDefinition().getConstructorArgumentValues()
  54                                         .addGenericArgumentValue(new RuntimeBeanReference(spec));
  55
  56                 String abstrac = element.getAttribute("abstract");
  57                 if (StringUtils.hasText(abstrac))
  58                         builder.setAbstract(Boolean.parseBoolean(abstrac));
  59
  60                 String parent = element.getAttribute("parent");
  61                 if (StringUtils.hasText(parent))
  62                         builder.setParentName(parent);
  63
  64                 builder.getBeanDefinition().setDescription(
  65                                 DomUtils.getChildElementValueByTagName(element, "description"));
  66
  67                 List<Element> execElems = new ArrayList<Element>();
  68                 List<Element> argsElems = new ArrayList<Element>();
  69                 NodeList nodeList = element.getChildNodes();
  70                 for (int i = 0; i < nodeList.getLength(); i++) {
  71                         Node node = nodeList.item(i);
  72                         if (node instanceof Element) {
  73                                 if (DomUtils.nodeNameEquals(node, "arg"))
  74                                         argsElems.add((Element) node);
  75                                 else if (!DomUtils.nodeNameEquals(node, "description"))
  76                                         execElems.add((Element) node);
  77                         }
  78                 }
  79
  80                 // Arguments
  81                 if (argsElems.size() != 0) {
  82                         ManagedMap args = new ManagedMap(argsElems.size());
  83                         for (Element argElem : argsElems) {
  84                                 Object value = NamespaceUtils.parseValue(argElem,
  85                                                 parserContext, builder.getBeanDefinition(), null);
  86                                 if (value != null)
  87                                         args.put(argElem.getAttribute("name"), value);
  88                                 else
  89                                         throw new SlcException("No value defined.");
  90                         }
  91                         builder.getBeanDefinition().getConstructorArgumentValues()
  92                                         .addGenericArgumentValue(args);
  93                 }
  94
  95                 // Executables
  96                 if (execElems.size() != 0) {
  97                         ManagedList executables = new ManagedList(execElems.size());
  98                         for (Element child : execElems) {
  99                                 // child validity check is performed in xsd
 100                                 executables.add(NamespaceUtils.parseBeanOrReference(child,
 101                                                 parserContext, builder.getBeanDefinition()));
 102                         }
 103                         if (executables.size() > 0)
 104                                 builder.addPropertyValue("executables", executables);
 105                 }
 106         }
 107
 108         @SuppressWarnings("unchecked")
 109         @Override
 110         protected Class<? extends ExecutionFlow> getBeanClass(Element element) {
 111                 String clss = element.getAttribute("class");
 112                 if (StringUtils.hasText(clss))
 113                         // TODO: check that it actually works
 114                         try {
 115                                 return (Class<? extends ExecutionFlow>) getClass()
 116                                                 .getClassLoader().loadClass(clss);
 117                         } catch (ClassNotFoundException e) {
 118                                 try {
 119                                         return (Class<? extends ExecutionFlow>) Thread
 120                                                         .currentThread().getContextClassLoader().loadClass(
 121                                                                         clss);
 122                                 } catch (ClassNotFoundException e1) {
 123                                         throw new SlcException("Cannot load class " + clss, e);
 124                                 }
 125                         }
 126                 else
 127                         return DefaultExecutionFlow.class;
 128         }
 129
 130         // parse nested bean definition
 131         // private Object parseBeanReference(Element element,
 132         // ParserContext parserContext, BeanDefinitionBuilder builder) {
 133         // return parserContext.getDelegate().parsePropertySubElement(element,
 134         // builder.getBeanDefinition());
 135         // }
 136
 137         @Override
 138         protected String resolveId(Element element,
 139                         AbstractBeanDefinition definition, ParserContext parserContext)
 140                         throws BeanDefinitionStoreException {
 141                 String name = element.getAttribute("name");
 142                 if (StringUtils.hasText(name)) {
 143                         return name;
 144                 } else {
 145                         return super.resolveId(element, definition, parserContext);
 146                 }
 147         }
 148
 149         protected boolean shouldGenerateIdAsFallback() {
 150                 return true;
 151         }
 152
 153 }