| /** |
| * Copyright (C) 2008 Google Inc. |
| * |
| * 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.google.inject; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import com.google.common.collect.Maps; |
| import com.google.inject.internal.Errors; |
| import com.google.inject.internal.ResolveFailedException; |
| import java.io.File; |
| import java.io.IOException; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Member; |
| import java.util.Arrays; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * Reflection that writes reflected data to a generated class. |
| * |
| * @author jessewilson@google.com (Jesse Wilson) |
| */ |
| class CodeGenReflectionFactory implements Reflection.Factory { |
| private static final String generatedCodePackage = "com.google.inject"; |
| private final String name; |
| private Map<Class<?>, ConstructionProxy<?>> constructionProxies = Maps.newHashMap(); |
| |
| /** |
| * @param name uniquely identifies this reflection instance. This name needs |
| * to be used both at code generation time and then later at runtime. |
| */ |
| public CodeGenReflectionFactory(String name) { |
| this.name = name; |
| } |
| |
| public Reflection create(ConstructionProxyFactory constructionProxyFactory) { |
| Reflection delegate = new RuntimeReflectionFactory().create(constructionProxyFactory); |
| return new CodeGenReflection(delegate); |
| } |
| |
| |
| public Reflection.Factory getRuntimeReflectionFactory() { |
| final Reflection reflection; |
| try { |
| reflection = (Reflection) Class.forName(getGeneratedClassName()).newInstance(); |
| } catch (Exception e) { |
| throw new IllegalStateException("Failed to build reflection class for \"" |
| + name + "\", has code been generated yet?"); |
| } |
| |
| return new Reflection.Factory() { |
| public Reflection create(ConstructionProxyFactory constructionProxyFactory) { |
| return reflection; |
| } |
| }; |
| } |
| |
| private String getGeneratedClassName() { |
| return generatedCodePackage + "." + generatedClassSimpleName(); |
| } |
| |
| private class CodeGenReflection implements Reflection { |
| private final Reflection delegate; |
| |
| private CodeGenReflection(Reflection delegate) { |
| this.delegate = checkNotNull(delegate, "delegate"); |
| } |
| |
| public <T> ConstructionProxy<T> getConstructionProxy(Errors errors, Class<T> implementation) |
| throws ResolveFailedException { |
| ConstructionProxy<T> result = delegate.getConstructionProxy(errors, implementation); |
| constructionProxies.put(implementation, result); |
| return result; |
| } |
| } |
| |
| /** |
| * Writes generated .java files to {@code generatedSourceDirectory}. |
| */ |
| void writeToFile(File generatedSourceDirectory) throws IOException { |
| JavaCodeGenerator out = JavaCodeGenerator.open(generatedSourceDirectory, |
| generatedCodePackage, generatedClassSimpleName()); |
| new ClassWriter(out).writeClass(); |
| out.close(); |
| } |
| |
| private String generatedClassSimpleName() { |
| return "Generated_" + name; |
| } |
| |
| private class ClassWriter { |
| final JavaCodeGenerator out; |
| |
| ClassWriter(JavaCodeGenerator out) { |
| this.out = out; |
| } |
| |
| void writeClass() throws IOException { |
| out.writePackageHeader(); |
| out.writeImport(Reflection.class); |
| out.writeImport(ConstructionProxy.class); |
| out.writeImport(InvocationTargetException.class); |
| out.writeImport(Parameter.class); |
| out.writeImport(List.class); |
| out.writeImport(Member.class); |
| out.writeImport(Parameter.class); |
| out.writeImport(Arrays.class); |
| out.writeImport(SuppressWarnings.class); |
| out.writeImport(Key.class); |
| out.writeImport(IllegalArgumentException.class); |
| out.writeImport(Object.class); |
| for (Map.Entry<Class<?>, ConstructionProxy<?>> entry : constructionProxies.entrySet()) { |
| out.writeImport(entry.getKey()); |
| for (Parameter<?> parameter : entry.getValue().getParameters()) { |
| out.writeImport(parameter.getKey().getTypeLiteral().getType()); |
| } |
| } |
| |
| out.writeLine() |
| .openScope("public class %s implements %s {", generatedClassSimpleName(), Reflection.class) |
| .writeLine(); |
| |
| writeGetConstructionProxy(); |
| |
| out.writeLine() |
| .closeScope("}"); |
| } |
| |
| String keyLiteral(Key<?> key) { |
| if (!(key.getTypeLiteral().getType() instanceof Class)) { |
| throw new UnsupportedOperationException("TODO"); |
| } |
| if (key.getAnnotationType() != null) { |
| throw new UnsupportedOperationException("TODO"); |
| } |
| return String.format("Key.get(%s.class)", out.typeName(key.getTypeLiteral().getType())); |
| } |
| |
| |
| void writeGetConstructionProxy() throws IOException { |
| out.writeLine("@%s(\"unchecked\")", SuppressWarnings.class) |
| .openScope("public <T> %s<T> getConstructionProxy(%s<T> implementation) {", ConstructionProxy.class, Class.class); |
| |
| for (Map.Entry<Class<?>, ConstructionProxy<?>> entry : constructionProxies.entrySet()) { |
| Class<?> implementation = entry.getKey(); |
| out.openScope("if (implementation == %s.class) {", implementation) |
| .openScope("return (%s) new %s<%s>() {", ConstructionProxy.class, ConstructionProxy.class, implementation); |
| |
| // newInstance |
| out.openScope("public %s newInstance(final %s... arguments) throws %s {", implementation, Object.class, InvocationTargetException.class) |
| .openScope("return new %s(", implementation); |
| int argument = 0; |
| for (Iterator<Parameter<?>> i = entry.getValue().getParameters().iterator(); i.hasNext(); ) { |
| Parameter<?> parameter = i.next(); |
| String separator = i.hasNext() ? "," : ""; |
| out.writeLine("(%s) arguments[%d]%s", parameter.getKey().getTypeLiteral().getType(), argument, separator); |
| argument++; |
| } |
| out.closeScope(");") |
| .closeScope("}"); |
| |
| // getParameters |
| out.openScope("public %s<%s<?>> getParameters() {", List.class, Parameter.class) |
| .openScope("return %s.<%s<?>>asList(", Arrays.class, Parameter.class); |
| argument = 0; |
| for (Iterator<Parameter<?>> i = entry.getValue().getParameters().iterator(); i.hasNext(); ) { |
| Parameter<?> parameter = i.next(); |
| String separator = i.hasNext() ? "," : ""; |
| out.writeLine("%s.create(%s, %s, %s)%s", Parameter.class, argument, keyLiteral(parameter.getKey()), parameter.allowsNull(), separator); |
| argument++; |
| } |
| out.closeScope(");") |
| .closeScope("}"); |
| |
| // getMember |
| out.openScope("public %s getMember() {", Member.class) |
| .writeLine("return null;") |
| .closeScope("}"); |
| |
| out.closeScope("};") |
| .closeScope("}"); |
| } |
| out.writeLine() |
| .writeLine("throw new %s();", IllegalArgumentException.class) |
| .closeScope("}"); |
| } |
| } |
| } |