io.sundr.dsl.internal.processor.DslProcessor Maven / Gradle / Ivy

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/*
 * Copyright 2015 The original authors.
 *
 *    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 io.sundr.dsl.internal.processor;

import io.sundr.codegen.model.ClassRef;
import io.sundr.codegen.model.TypeDef;
import io.sundr.codegen.model.TypeDefBuilder;
import io.sundr.codegen.model.Kind;
import io.sundr.codegen.model.Method;
import io.sundr.codegen.model.MethodBuilder;
import io.sundr.codegen.model.TypeRef;
import io.sundr.codegen.processor.JavaGeneratingProcessor;
import io.sundr.codegen.utils.ModelUtils;
import io.sundr.codegen.utils.TypeUtils;
import io.sundr.dsl.annotations.InterfaceName;
import io.sundr.dsl.internal.graph.Node;
import io.sundr.dsl.internal.graph.NodeContext;
import io.sundr.dsl.internal.graph.functions.Nodes;
import io.sundr.dsl.internal.type.functions.Generics;
import io.sundr.dsl.internal.utils.TypeDefUtils;

import javax.annotation.processing.RoundEnvironment;
import javax.annotation.processing.SupportedAnnotationTypes;
import javax.lang.model.element.Element;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.Modifier;
import javax.lang.model.element.TypeElement;
import javax.lang.model.util.ElementFilter;
import javax.lang.model.util.Elements;
import javax.lang.model.util.Types;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;

import static io.sundr.dsl.internal.Constants.ORIGINAL_REF;
import static io.sundr.dsl.internal.utils.TypeDefUtils.executablesToInterfaces;
import static io.sundr.dsl.internal.Constants.IS_GENERATED;

@SupportedAnnotationTypes("io.sundr.dsl.annotations.Dsl")
public class DslProcessor extends JavaGeneratingProcessor {

    public static final String DEFAULT_TEMPLATE_LOCATION = "templates/dsl/dsl.vm";

    @Override
    public boolean process(Set annotations, RoundEnvironment env) {
        Elements elements = processingEnv.getElementUtils();
        Types types = processingEnv.getTypeUtils();
        DslContext context = DslContextManager.create(elements, types);

        for (TypeElement annotation : annotations) {
            for (Element element : env.getElementsAnnotatedWith(annotation)) {
                if (element instanceof TypeElement) {
                    Generics.clear();
                    TypeElement typeElement = (TypeElement) element;
                    InterfaceName interfaceName = element.getAnnotation(InterfaceName.class);
                    String targetInterface = interfaceName.value();
                    Set interfacesToGenerate = new LinkedHashSet();
                    Collection sorted = ElementFilter.methodsIn(typeElement.getEnclosedElements());

                    //1st step generate generic interface for all types.
                    Set genericInterfaces = executablesToInterfaces(context, sorted);
                    Set genericAndScopeInterfaces = Nodes.TO_SCOPE.apply(genericInterfaces);
                    for (TypeDef clazz : genericAndScopeInterfaces) {
                        if (!TypeDefUtils.isEntryPoint(clazz)) {
                            interfacesToGenerate.add(clazz);
                        }
                    }

                    //2nd step create dependency graph.
                    List methods = new ArrayList();
                    Set> graph = Nodes.TO_GRAPH.apply(genericAndScopeInterfaces);

                    for (Node root : graph) {
                        Node uncyclic = Nodes.TO_UNCYCLIC.apply(root);
                        Node unwrapped = Nodes.TO_UNWRAPPED.apply(NodeContext.builder().withItem(uncyclic.getItem()).build());
                        TypeDef current = unwrapped.getItem();

                        //If there are not transitions don't generate root interface.
                        //Just add the method with the direct return type.
                        if (unwrapped.getTransitions().isEmpty()) {
                            for (Method m : current.getMethods()) {
                                TypeRef returnType = m.getReturnType();
                                if (returnType instanceof ClassRef) {
                                    TypeDef toUnwrap = ((ClassRef)returnType).getDefinition();
                                    methods.add(new MethodBuilder(m).withReturnType(Generics.UNWRAP.apply(toUnwrap).toInternalReference()).build());
                                } else if (returnType.getAttributes().containsKey(ORIGINAL_REF)) {
                                    methods.add(new MethodBuilder(m).withReturnType((TypeRef) returnType.getAttributes().get(ORIGINAL_REF)).build());
                                } else {
                                    methods.add(new MethodBuilder(m).withReturnType(returnType).build());
                                }
                            }
                        } else {
                            for (Method m : current.getMethods()) {
                                methods.add(new MethodBuilder(m).withReturnType(current.toUnboundedReference()).build());
                            }

                            interfacesToGenerate.add(Nodes.TO_ROOT.apply(unwrapped));
                        }
                    }

                    //Do generate the DSL interface
                    interfacesToGenerate.add(new TypeDefBuilder()
                            .withPackageName(ModelUtils.getPackageElement(element).toString())
                            .withName(targetInterface)
                            .withKind(Kind.INTERFACE)
                            .withModifiers(TypeUtils.modifiersToInt(Modifier.PUBLIC))
                            .withMethods(methods)
                            .build());

                    interfacesToGenerate.addAll(context.getDefinitionRepository().getDefinitions(IS_GENERATED));

                    try {
                        for (TypeDef clazz : interfacesToGenerate) {
                            generateFromClazz(clazz, DEFAULT_TEMPLATE_LOCATION);
                        }
                    } catch (IOException e) {
                        throw new RuntimeException(e);
                    }
                }
            }
        }
        return true;
    }
}