Java tutorial
/* * Copyright 2011, The gwtquery team. * * Licensed under the Apache License, Version 2.0 (the "License"); you may not * use this file except in compliance with the License. You may obtain a copy of * the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations under * the License. */ package com.cgxlib.xq.rebind; /* * #%L * CGXlib * %% * Copyright (C) 2016 CGXlib (http://www.cgxlib.com) * %% * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * #L% Code is originally from gwtquery, and modified by CGXlib team. */ import com.cgxlib.xq.client.Properties; import com.cgxlib.xq.client.builders.Name; import com.cgxlib.xq.client.builders.XmlBuilder; import com.google.gwt.core.ext.Generator; import com.google.gwt.core.ext.GeneratorContext; import com.google.gwt.core.ext.TreeLogger; import com.google.gwt.core.ext.UnableToCompleteException; import com.google.gwt.core.ext.typeinfo.*; import com.google.gwt.user.rebind.ClassSourceFileComposerFactory; import com.google.gwt.user.rebind.SourceWriter; import java.io.PrintWriter; /** */ public class XmlBuilderGenerator extends Generator { static JClassType xmlBuilderType; static JClassType stringType; TypeOracle oracle; public String generate(TreeLogger treeLogger, GeneratorContext generatorContext, String requestedClass) throws UnableToCompleteException { oracle = generatorContext.getTypeOracle(); JClassType clazz = oracle.findType(requestedClass); xmlBuilderType = oracle.findType(XmlBuilder.class.getName()); stringType = oracle.findType(String.class.getName()); String t[] = generateClassName(clazz); SourceWriter sw = getSourceWriter(treeLogger, generatorContext, t[0], t[1], requestedClass); if (sw != null) { for (JMethod method : clazz.getInheritableMethods()) { // skip method from JsonBuilder if (xmlBuilderType.findMethod(method.getName(), method.getParameterTypes()) != null) { continue; } generateMethod(sw, method, treeLogger); } sw.commit(treeLogger); } return t[2]; } public String[] generateClassName(JType t) { String[] ret = new String[3]; JClassType c = t.isClassOrInterface(); ret[0] = c.getPackage().getName(); ret[1] = c.getName().replace('.', '_') + "_XmlBuilder"; ret[2] = ret[0] + "." + ret[1]; return ret; } public boolean isTypeAssignableTo(JType t, JClassType o) { JClassType c = t.isClassOrInterface(); return (c != null && c.isAssignableTo(o)); } public void generateMethod(SourceWriter sw, JMethod method, TreeLogger logger) throws UnableToCompleteException { Name nameAnnotation = method.getAnnotation(Name.class); String name = nameAnnotation != null ? nameAnnotation.value() : method.getName().replaceFirst("^(get|set)", ""); if (nameAnnotation == null) { name = name.substring(0, 1).toLowerCase() + name.substring(1); } String retType = method.getReturnType().getParameterizedQualifiedSourceName(); sw.print("public final " + retType + " " + method.getName()); JParameter[] params = method.getParameters(); if (params.length == 0) { JArrayType arr = method.getReturnType().isArray(); sw.println("() {"); sw.indent(); if (retType.matches("(java.lang.Boolean|boolean)")) { sw.println("return getBooleanBase(\"" + name + "\");"); } else if (method.getReturnType().isPrimitive() != null) { sw.println("return (" + retType + ")getFloatBase(\"" + name + "\");"); } else if (isTypeAssignableTo(method.getReturnType(), stringType)) { sw.println("return getStrBase(\"" + name + "\");"); } else if (isTypeAssignableTo(method.getReturnType(), xmlBuilderType)) { String q = method.getReturnType().getQualifiedSourceName(); sw.println("Element e = getElementBase(\"" + name + "\");"); sw.println( "return e == null ? null : (" + q + ")((" + q + ")GWT.create(" + q + ".class)).load(e);"); } else if (retType.equals(Properties.class.getName())) { sw.println("return getPropertiesBase(\"" + name + "\");"); } else if (arr != null) { String q = arr.getComponentType().getQualifiedSourceName(); sw.println("ArrayList<" + q + "> l = new ArrayList<" + q + ">();"); sw.println("for (Element e: getElementsBase(\"" + name + "\")) {"); sw.println(" " + q + " c = GWT.create(" + q + ".class);"); sw.println(" c.load(e);"); sw.println(" l.add(c);"); sw.println("}"); sw.println("return l.toArray(new " + q + "[0]);"); } else { sw.println("return null; // Unsupported return type: " + retType); } sw.outdent(); sw.println("}"); } else if (params.length == 1) { JType type = params[0].getType(); JArrayType arr = type.isArray(); String qname = type.getParameterizedQualifiedSourceName(); sw.print("(" + qname + " a)"); sw.println("{"); sw.indent(); if (arr != null) { sw.println("setArrayBase(\"" + name + "\", a);"); } else { sw.println("setBase(\"" + name + "\", a);"); } if (!"void".equals(retType)) { if (isTypeAssignableTo(method.getReturnType(), method.getEnclosingType())) { sw.println("return this;"); } else { sw.println("return null;"); } } sw.outdent(); sw.println("}"); } } protected SourceWriter getSourceWriter(TreeLogger logger, GeneratorContext context, String packageName, String className, String... interfaceNames) { PrintWriter printWriter = context.tryCreate(logger, packageName, className); if (printWriter == null) { return null; } ClassSourceFileComposerFactory composerFactory = new ClassSourceFileComposerFactory(packageName, className); composerFactory.setSuperclass( "com.cgxlib.xq.client.builders.XmlBuilderBase<" + packageName + "." + className + ">"); composerFactory.addImport("com.cgxlib.xq.client.js.*"); composerFactory.addImport("com.cgxlib.xq.client.*"); composerFactory.addImport("com.google.gwt.core.client.*"); composerFactory.addImport("com.google.gwt.dom.client.*"); composerFactory.addImport("java.util.*"); for (String interfaceName : interfaceNames) { composerFactory.addImplementedInterface(interfaceName); } return composerFactory.createSourceWriter(context, printWriter); } }