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package org.apache.camel.spring.xml; |
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import java.lang.annotation.Annotation; |
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import java.lang.reflect.Array; |
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import java.lang.reflect.Method; |
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import java.util.ArrayList; |
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import java.util.Collections; |
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import java.util.Comparator; |
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import java.util.HashMap; |
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import java.util.HashSet; |
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import java.util.LinkedHashMap; |
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import java.util.List; |
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import java.util.Set; |
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import java.util.Map; |
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import org.apache.camel.Expression; |
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import org.apache.camel.builder.Fluent; |
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import org.apache.camel.builder.FluentArg; |
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import org.apache.camel.builder.RouteBuilder; |
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import org.apache.camel.builder.ValueBuilder; |
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import org.springframework.beans.SimpleTypeConverter; |
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import org.springframework.beans.factory.config.RuntimeBeanReference; |
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import org.springframework.beans.factory.config.BeanDefinition; |
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import org.springframework.beans.factory.support.AbstractBeanDefinition; |
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import org.springframework.beans.factory.support.BeanDefinitionBuilder; |
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import org.springframework.beans.factory.support.ChildBeanDefinition; |
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import org.springframework.beans.factory.xml.AbstractBeanDefinitionParser; |
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import org.springframework.beans.factory.xml.ParserContext; |
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import org.springframework.util.StringUtils; |
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import org.springframework.util.xml.DomUtils; |
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import org.w3c.dom.Attr; |
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import org.w3c.dom.Element; |
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import org.w3c.dom.NamedNodeMap; |
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import org.w3c.dom.Node; |
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import org.w3c.dom.NodeList; |
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public class CamelBeanDefinitionParser extends AbstractBeanDefinitionParser { |
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private final CamelNamespaceHandler namespaceHandler; |
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private int counter; |
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public CamelBeanDefinitionParser(CamelNamespaceHandler namespaceHandler) { |
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this.namespaceHandler = namespaceHandler; |
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} |
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protected AbstractBeanDefinition parseInternal(Element element, ParserContext parserContext) { |
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BeanDefinitionBuilder factory = BeanDefinitionBuilder.rootBeanDefinition(RouteBuilderFactoryBean.class); |
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List childElements = DomUtils.getChildElementsByTagName(element, "route"); |
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ArrayList<BuilderStatement> routes = new ArrayList<BuilderStatement>(childElements.size()); |
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if (childElements != null && childElements.size() > 0) { |
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for (int i = 0; i < childElements.size(); ++i) { |
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Element routeElement = (Element) childElements.get(i); |
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ArrayList<BuilderAction> actions = new ArrayList<BuilderAction>(); |
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Class type = parseBuilderElement(parserContext, routeElement, RouteBuilder.class, actions); |
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BuilderStatement statement = new BuilderStatement(); |
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statement.setReturnType(type); |
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statement.setActions(actions); |
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routes.add(statement); |
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} |
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} |
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factory.addPropertyValue("routes", routes); |
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return factory.getBeanDefinition(); |
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} |
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private Class parseBuilderElement(ParserContext parserContext, Element element, Class<RouteBuilder> builder, ArrayList<BuilderAction> actions) { |
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Class currentBuilder = builder; |
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NodeList childElements = element.getChildNodes(); |
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Element previousElement = null; |
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for (int i = 0; i < childElements.getLength(); ++i) { |
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Node node = childElements.item(i); |
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if (node.getNodeType() == Node.ELEMENT_NODE) { |
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currentBuilder = parseAction(parserContext, currentBuilder, actions, (Element) node, previousElement); |
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previousElement = (Element) node; |
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BuilderAction action = actions.get(actions.size()-1); |
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if( action.getMethodInfo().methodAnnotation.nestedActions() ) { |
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currentBuilder = parseBuilderElement(parserContext, (Element) node, currentBuilder, actions); |
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} else { |
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if( hasChildElements(node) ) { |
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throw new IllegalArgumentException("The element "+node.getLocalName()+" should not have any child elements."); |
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} |
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} |
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} |
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} |
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if( currentBuilder!=null ) { |
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Method[] methods = currentBuilder.getMethods(); |
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for (int i = 0; i < methods.length; i++) { |
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Method method = methods[i]; |
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Fluent annotation = method.getAnnotation(Fluent.class); |
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if( annotation!=null && annotation.callOnElementEnd() ) { |
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if( method.getParameterTypes().length > 0 ) { |
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throw new RuntimeException("Only methods with no parameters can annotated with @Fluent(callOnElementEnd=true): "+method); |
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} |
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MethodInfo methodInfo = new MethodInfo(method, annotation, new LinkedHashMap<String, Class>(), new LinkedHashMap<String, FluentArg>()); |
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actions.add(new BuilderAction(methodInfo, new HashMap<String, Object>())); |
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currentBuilder = method.getReturnType(); |
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} |
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} |
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} |
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return currentBuilder; |
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} |
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private boolean hasChildElements(Node node) { |
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NodeList nl = node.getChildNodes(); |
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for (int j = 0; j < nl.getLength(); ++j) { |
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if( nl.item(j).getNodeType() == Node.ELEMENT_NODE ) { |
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return true; |
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} |
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} |
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return false; |
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} |
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private Class parseAction(ParserContext parserContext, Class currentBuilder, ArrayList<BuilderAction> actions, Element element, Element previousElement) { |
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String actionName = element.getLocalName(); |
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ArrayList<MethodInfo> methods = findFluentMethodsWithName(currentBuilder, element.getLocalName()); |
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if (methods.isEmpty()) { |
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throw new IllegalActionException(actionName, previousElement == null ? null : previousElement.getLocalName()); |
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} |
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Collections.sort(methods, new Comparator<MethodInfo>() { |
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public int compare(MethodInfo m1, MethodInfo m2) { |
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return m1.method.getParameterTypes().length - m2.method.getParameterTypes().length; |
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} |
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}); |
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HashMap<String, Object> attributeArguments = getArugmentsFromAttributes(element); |
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HashMap<String, ArrayList<Element>> elementArguments = getArgumentsFromElements(element); |
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MethodInfo match = null; |
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match = findMethodMatch(methods, attributeArguments.keySet(), elementArguments.keySet()); |
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if (match == null) |
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throw new IllegalActionException(actionName, previousElement == null ? null : previousElement.getLocalName()); |
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Set<Map.Entry<String, Object>> attributeEntries = attributeArguments.entrySet(); |
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for (Map.Entry<String, Object> entry : attributeEntries) { |
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String name = entry.getKey(); |
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FluentArg arg = match.parameterAnnotations.get(name); |
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if (arg != null && (arg.reference() || name.equals("ref"))) { |
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Object value = entry.getValue(); |
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if (value instanceof String) { |
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entry.setValue(new RuntimeBeanReference(value.toString())); |
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} |
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} |
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} |
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Set<String> parameterNames = new HashSet<String>(match.parameters.keySet()); |
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parameterNames.removeAll(attributeArguments.keySet()); |
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for (String key : parameterNames) { |
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ArrayList<Element> elements = elementArguments.get(key); |
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if (elements == null) { |
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elements = getFirstChildElements(element); |
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} |
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Class clazz = match.parameters.get(key); |
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Object value = convertTo(parserContext, elements, clazz); |
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attributeArguments.put(key, value); |
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for (Element el : elements) { |
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el.getParentNode().removeChild(el); |
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} |
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} |
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actions.add(new BuilderAction(match, attributeArguments)); |
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return match.method.getReturnType(); |
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} |
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private ArrayList<Element> getFirstChildElements(Element element) { |
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ArrayList<Element> answer = new ArrayList<Element>(); |
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NodeList list = element.getChildNodes(); |
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for (int i = 0, size = list.getLength(); i < size; i++) { |
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Node node = list.item(i); |
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if (node instanceof Element) { |
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answer.add((Element) node); |
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break; |
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} |
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} |
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return answer; |
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} |
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private Object convertTo(ParserContext parserContext, ArrayList<Element> elements, Class clazz) { |
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if( clazz.isArray() || elements.size() > 1 ) { |
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List list = new ArrayList(); |
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for( int i=0; i < elements.size(); i ++ ) { |
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ArrayList<Element> e = new ArrayList<Element>(1); |
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e.add(elements.get(i)); |
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Object value = convertTo(parserContext, e, clazz.getComponentType()); |
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list.add(value); |
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} |
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return list; |
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} else { |
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Element element = elements.get(0); |
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String ref = element.getAttribute("ref"); |
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if( StringUtils.hasText(ref) ) { |
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return new RuntimeBeanReference(ref); |
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} |
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if( hasChildElements(element) ) { |
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ArrayList<BuilderAction> actions = new ArrayList<BuilderAction>(); |
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Class type = parseBuilderElement(parserContext, element, RouteBuilder.class, actions); |
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if ( type == ValueBuilder.class && clazz==Expression.class ) { |
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Method method; |
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try { |
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method = ValueBuilder.class.getMethod("getExpression", new Class[]{}); |
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} catch (Throwable e) { |
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throw new RuntimeException(ValueBuilder.class.getName()+" does not have the getExpression() method."); |
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} |
263 |
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MethodInfo methodInfo = new MethodInfo(method, null, new LinkedHashMap<String, Class>(), new LinkedHashMap<String, FluentArg>()); |
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actions.add(new BuilderAction(methodInfo, new HashMap<String, Object>())); |
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type = Expression.class; |
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} |
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BuilderStatement statement = new BuilderStatement(); |
269 |
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statement.setReturnType(type); |
270 |
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statement.setActions(actions); |
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272 |
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if( !clazz.isAssignableFrom( statement.getReturnType() ) ) { |
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throw new IllegalStateException("Builder does not produce object of expected type: "+clazz.getName()+", it produced: "+statement.getReturnType()); |
274 |
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} |
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276 |
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return statement; |
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} else { |
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279 |
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String name = element.getLocalName(); |
280 |
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if (namespaceHandler.getParserElementNames().contains(name)) { |
281 |
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String id = createBeanId(name); |
282 |
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element.setAttribute("id", id); |
283 |
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namespaceHandler.parse(element, parserContext); |
284 |
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return new RuntimeBeanReference(id); |
285 |
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} |
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287 |
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288 |
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SimpleTypeConverter converter = new SimpleTypeConverter(); |
289 |
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return converter.convertIfNecessary(element.getTextContent(), clazz); |
290 |
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} |
291 |
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} |
292 |
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} |
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294 |
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protected synchronized String createBeanId(String name) { |
295 |
2 |
return "_internal:camel:bean:" + name + (++counter); |
296 |
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} |
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298 |
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private MethodInfo findMethodMatch(ArrayList<MethodInfo> methods, Set<String> attributeNames, Set<String> elementNames) { |
299 |
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for (MethodInfo method : methods) { |
300 |
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303 |
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boolean miss = false; |
304 |
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for (String key : attributeNames) { |
305 |
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FluentArg arg = method.parameterAnnotations.get(key); |
306 |
123 |
if (arg == null || !arg.attribute()) { |
307 |
63 |
miss = true; |
308 |
63 |
break; |
309 |
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} |
310 |
60 |
} |
311 |
140 |
if (miss) |
312 |
63 |
continue; |
313 |
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314 |
77 |
Set<String> parameterNames = new HashSet<String>(method.parameters.keySet()); |
315 |
77 |
parameterNames.removeAll(attributeNames); |
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317 |
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318 |
77 |
if (parameterNames.isEmpty()) { |
319 |
67 |
return method; |
320 |
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} |
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344 |
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return method; |
345 |
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} |
346 |
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return null; |
347 |
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} |
348 |
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349 |
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private LinkedHashMap<String, ArrayList<Element>> getArgumentsFromElements(Element element) { |
350 |
77 |
LinkedHashMap<String, ArrayList<Element>> elements = new LinkedHashMap<String, ArrayList<Element>>(); |
351 |
77 |
NodeList childNodes = element.getChildNodes(); |
352 |
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String lastTag = null; |
353 |
146 |
for (int i = 0; i < childNodes.getLength(); i++) { |
354 |
69 |
Node node = childNodes.item(i); |
355 |
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if (node.getNodeType() == Node.ELEMENT_NODE) { |
356 |
26 |
Element el = (Element) node; |
357 |
26 |
String tag = el.getLocalName(); |
358 |
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ArrayList<Element> els = elements.get(tag); |
359 |
26 |
if (els == null) { |
360 |
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els = new ArrayList<Element>(); |
361 |
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elements.put(el.getLocalName(), els); |
362 |
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els.add(el); |
363 |
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lastTag = tag; |
364 |
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} else { |
365 |
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366 |
2 |
if (tag.equals(lastTag)) { |
367 |
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els.add(el); |
368 |
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lastTag = tag; |
369 |
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} |
370 |
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} |
371 |
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} |
372 |
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} |
373 |
77 |
return elements; |
374 |
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} |
375 |
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376 |
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private HashMap<String, Object> getArugmentsFromAttributes(Element element) { |
377 |
77 |
HashMap<String, Object> attributes = new HashMap<String, Object>(); |
378 |
77 |
NamedNodeMap childNodes = element.getAttributes(); |
379 |
137 |
for (int i = 0; i < childNodes.getLength(); i++) { |
380 |
60 |
Node node = childNodes.item(i); |
381 |
60 |
if (node.getNodeType() == Node.ATTRIBUTE_NODE) { |
382 |
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Attr attr = (Attr) node; |
383 |
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|
384 |
60 |
String str = attr.getValue(); |
385 |
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Object value = str; |
386 |
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387 |
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|
388 |
60 |
if (str.startsWith("#")) { |
389 |
0 |
str = str.substring(1); |
390 |
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|
391 |
0 |
if (!str.startsWith("#")) { |
392 |
0 |
value = new RuntimeBeanReference(str); |
393 |
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} |
394 |
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} |
395 |
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396 |
60 |
attributes.put(attr.getName(), value); |
397 |
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} |
398 |
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} |
399 |
77 |
return attributes; |
400 |
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} |
401 |
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403 |
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404 |
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405 |
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406 |
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409 |
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410 |
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411 |
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private ArrayList<MethodInfo> findFluentMethodsWithName(Class clazz, String name) { |
412 |
77 |
ArrayList<MethodInfo> rc = new ArrayList<MethodInfo>(); |
413 |
77 |
Method[] methods = clazz.getMethods(); |
414 |
4418 |
for (int i = 0; i < methods.length; i++) { |
415 |
4341 |
Method method = methods[i]; |
416 |
4341 |
if (!method.isAnnotationPresent(Fluent.class)) { |
417 |
1663 |
continue; |
418 |
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} |
419 |
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420 |
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|
421 |
2678 |
Fluent fluentAnnotation = method.getAnnotation(Fluent.class); |
422 |
2678 |
if ( StringUtils.hasText(fluentAnnotation.value()) ? |
423 |
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name.equals(fluentAnnotation.value()) : |
424 |
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name.equals(method.getName()) ) { |
425 |
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|
426 |
179 |
LinkedHashMap<String, Class> map = new LinkedHashMap<String, Class>(); |
427 |
179 |
LinkedHashMap<String, FluentArg> amap = new LinkedHashMap<String, FluentArg>(); |
428 |
179 |
Class<?>[] parameters = method.getParameterTypes(); |
429 |
330 |
for (int j = 0; j < parameters.length; j++) { |
430 |
171 |
Class<?> parameter = parameters[j]; |
431 |
171 |
FluentArg annotation = getParameterAnnotation(FluentArg.class, method, j); |
432 |
171 |
if (annotation != null) { |
433 |
151 |
map.put(annotation.value(), parameter); |
434 |
151 |
amap.put(annotation.value(), annotation); |
435 |
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} else { |
436 |
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break; |
437 |
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} |
438 |
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} |
439 |
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|
440 |
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|
441 |
179 |
if (parameters.length == map.size()) { |
442 |
159 |
rc.add(new MethodInfo(method, fluentAnnotation, map, amap)); |
443 |
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} |
444 |
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} |
445 |
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} |
446 |
77 |
return rc; |
447 |
|
} |
448 |
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|
449 |
|
private <T> T getParameterAnnotation(Class<T> annotationClass, Method method, int index) { |
450 |
171 |
Annotation[] annotations = method.getParameterAnnotations()[index]; |
451 |
171 |
for (int i = 0; i < annotations.length; i++) { |
452 |
151 |
if (annotationClass.isAssignableFrom(annotations[i].getClass())) { |
453 |
151 |
return (T) annotations[i]; |
454 |
|
} |
455 |
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} |
456 |
20 |
return null; |
457 |
|
} |
458 |
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|
459 |
|
} |