Java tutorial
package com.predic8.membrane.annot.generator; import java.io.BufferedWriter; import java.io.IOException; import java.util.ArrayList; import java.util.List; import javax.annotation.processing.FilerException; import javax.annotation.processing.ProcessingEnvironment; import javax.lang.model.element.Element; import javax.lang.model.element.TypeElement; import javax.tools.FileObject; import com.predic8.membrane.annot.AnnotUtils; import com.predic8.membrane.annot.model.AttributeInfo; import com.predic8.membrane.annot.model.ChildElementDeclarationInfo; import com.predic8.membrane.annot.model.ChildElementInfo; import com.predic8.membrane.annot.model.ElementInfo; import com.predic8.membrane.annot.model.MainInfo; import com.predic8.membrane.annot.model.Model; public class Parsers { private final ProcessingEnvironment processingEnv; public Parsers(ProcessingEnvironment processingEnv) { this.processingEnv = processingEnv; } public void writeParserDefinitior(Model m) throws IOException { for (MainInfo main : m.getMains()) { List<Element> sources = new ArrayList<Element>(); sources.addAll(main.getInterceptorElements()); sources.add(main.getElement()); try { FileObject o = processingEnv.getFiler().createSourceFile( main.getAnnotation().outputPackage() + ".NamespaceHandlerAutoGenerated", sources.toArray(new Element[0])); BufferedWriter bw = new BufferedWriter(o.openWriter()); try { bw.write("/* Copyright 2012,2013 predic8 GmbH, www.predic8.com\r\n" + "\r\n" + " Licensed under the Apache License, Version 2.0 (the \"License\");\r\n" + " you may not use this file except in compliance with the License.\r\n" + " You may obtain a copy of the License at\r\n" + "\r\n" + " http://www.apache.org/licenses/LICENSE-2.0\r\n" + "\r\n" + " Unless required by applicable law or agreed to in writing, software\r\n" + " distributed under the License is distributed on an \"AS IS\" BASIS,\r\n" + " WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n" + " See the License for the specific language governing permissions and\r\n" + " limitations under the License. */\r\n" + "\r\n" + "package " + main.getAnnotation().outputPackage() + ";\r\n" + "\r\n" + "/**\r\n" + " * Automatically generated by " + Parsers.class.getName() + ".\r\n" + " */\r\n" + "public class NamespaceHandlerAutoGenerated {\r\n" + "\r\n" + " public static void registerBeanDefinitionParsers(NamespaceHandler nh) {\r\n"); for (ElementInfo i : main.getIis()) { if (i.getAnnotation().topLevel()) { bw.write(" nh.registerGlobalBeanDefinitionParser(\"" + i.getAnnotation().name() + "\", new " + i.getParserClassSimpleName() + "());\r\n"); } else { for (ChildElementDeclarationInfo cedi : i.getUsedBy()) { for (ChildElementInfo cei : cedi.getUsedBy()) { TypeElement element = cei.getEi().getElement(); String clazz = AnnotUtils.getRuntimeClassName(element); bw.write(" nh.registerLocalBeanDefinitionParser(\"" + clazz + "\", \"" + i.getAnnotation().name() + "\", new " + i.getParserClassSimpleName() + "());\r\n"); } } } } bw.write(" }\r\n" + "}\r\n" + ""); } finally { bw.close(); } } catch (FilerException e) { if (e.getMessage().contains("Source file already created")) return; throw e; } } } public void writeParsers(Model m) throws IOException { for (MainInfo main : m.getMains()) { for (ElementInfo ii : main.getIis()) { List<Element> sources = new ArrayList<Element>(); sources.add(main.getElement()); sources.add(ii.getElement()); String interceptorClassName = ii.getElement().getQualifiedName().toString(); try { FileObject o = processingEnv.getFiler().createSourceFile( main.getAnnotation().outputPackage() + "." + ii.getParserClassSimpleName(), sources.toArray(new Element[0])); BufferedWriter bw = new BufferedWriter(o.openWriter()); try { bw.write("/* Copyright 2012 predic8 GmbH, www.predic8.com\r\n" + "\r\n" + " Licensed under the Apache License, Version 2.0 (the \"License\");\r\n" + " you may not use this file except in compliance with the License.\r\n" + " You may obtain a copy of the License at\r\n" + "\r\n" + " http://www.apache.org/licenses/LICENSE-2.0\r\n" + "\r\n" + " Unless required by applicable law or agreed to in writing, software\r\n" + " distributed under the License is distributed on an \"AS IS\" BASIS,\r\n" + " WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n" + " See the License for the specific language governing permissions and\r\n" + " limitations under the License. */\r\n" + "\r\n" + "package " + main.getAnnotation().outputPackage() + ";\r\n" + "\r\n" + "import org.w3c.dom.Element;\r\n" + "import org.springframework.beans.factory.xml.ParserContext;\r\n" + "import org.springframework.beans.factory.support.BeanDefinitionBuilder;\r\n"); if (!main.getAnnotation().outputPackage().equals("com.predic8.membrane.core.config.spring")) bw.write("import com.predic8.membrane.core.config.spring.*;\r\n"); bw.write("\r\n" + "/**\r\n" + " * Automatically generated by " + Parsers.class.getName() + ".\r\n" + " */\r\n" + "public class " + ii.getParserClassSimpleName() + " extends AbstractParser {\r\n" + "\r\n" + " protected Class<?> getBeanClass(org.w3c.dom.Element element) {\r\n" + " return " + interceptorClassName + ".class;\r\n" + " }\r\n"); bw.write(" @Override\r\n" + " protected void doParse(Element element, ParserContext parserContext, BeanDefinitionBuilder builder) {\r\n"); if (ii.isHasIdField()) bw.write(" setPropertyIfSet(\"id\", element, builder);\r\n"); bw.write(" setIdIfNeeded(element, parserContext, \"" + ii.getAnnotation().name() + "\");\r\n"); for (AttributeInfo ai : ii.getAis()) { if (ai.getXMLName().equals("id")) continue; if (ai.isBeanReference(processingEnv.getTypeUtils())) { if (!ai.isRequired()) bw.write(" if (element.hasAttribute(\"" + ai.getXMLName() + "\"))\r\n"); bw.write(" builder.addPropertyReference(\"" + ai.getSpringName() + "\", element.getAttribute(\"" + ai.getXMLName() + "\"));\r\n"); } else { bw.write(" setProperty" + (ai.isRequired() ? "" : "IfSet") + "(\"" + ai.getXMLName() + "\", \"" + ai.getSpringName() + "\", element, builder" + (ai.isEnum(processingEnv.getTypeUtils()) ? ", true" : "") + ");\r\n"); } if (ai.getXMLName().equals("name")) bw.write(" element.removeAttribute(\"name\");\r\n"); } if (ii.getOai() != null) { bw.write(" setProperties(\"" + ii.getOai().getSpringName() + "\", element, builder);\r\n"); } for (ChildElementInfo cei : ii.getCeis()) if (cei.isList()) bw.write(" builder.addPropertyValue(\"" + cei.getPropertyName() + "\", new java.util.ArrayList<Object>());\r\n"); if (ii.getTci() != null) bw.write(" builder.addPropertyValue(\"" + ii.getTci().getPropertyName() + "\", element.getTextContent());\r\n"); else bw.write(" parseChildren(element, parserContext, builder);\r\n"); for (ChildElementInfo cei : ii.getCeis()) if (cei.isList() && cei.isRequired()) { bw.write( " if (builder.getBeanDefinition().getPropertyValues().getPropertyValue(\"" + cei.getPropertyName() + "[0]\") == null)\r\n"); bw.write(" throw new RuntimeException(\"Property '" + cei.getPropertyName() + "' is required, but none was defined (empty list).\");\r\n"); } bw.write(" }\r\n" + ""); bw.write("@Override\r\n" + "protected void handleChildObject(Element ele, ParserContext parserContext, BeanDefinitionBuilder builder, Class<?> clazz, Object child) {\r\n"); for (ChildElementInfo cei : ii.getCeis()) { bw.write(" if (" + cei.getTypeDeclaration().getQualifiedName() + ".class.isAssignableFrom(clazz)) {\r\n" + " setProperty(builder, \"" + cei.getPropertyName() + "\"" + (cei.isList() ? "+\"[\"+ incrementCounter(builder, \"" + cei.getPropertyName() + "\") + \"]\" " : "") + ", child);\r\n" + " } else \r\n"); } bw.write(" {\r\n" + " throw new RuntimeException(\"Unknown child class \\\"\" + clazz + \"\\\".\");\r\n" + " }\r\n"); bw.write("}\r\n"); bw.write("}\r\n" + ""); } finally { bw.close(); } } catch (FilerException e) { if (e.getMessage().contains("Source file already created")) return; throw e; } } } } }