io.helidon.codegen.classmodel.ImportOrganizer Maven / Gradle / Ivy
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Class model generator designed to be used by code generating components (annotation processors, maven plugins)
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/*
* Copyright (c) 2023, 2024 Oracle and/or its affiliates.
*
* 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.helidon.codegen.classmodel;
import java.io.IOException;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import io.helidon.common.types.TypeName;
class ImportOrganizer {
private final List> importsToWrite;
private final List> staticImportsToWrite;
//Set of all imports to make it easier to go through when checking what import name should be used.
private final Set imports;
private final Set noImport;
private final Set forcedFullImports;
private final Map identifiedInnerClasses;
private ImportOrganizer(Builder builder) {
this.importsToWrite = ImportSorter.sortImports(builder.finalImports.values());
this.staticImportsToWrite = ImportSorter.sortImports(builder.staticImports.stream()
.map(Type::fqTypeName)
.toList());
this.imports = Set.copyOf(builder.finalImports.values());
this.noImport = builder.noImports.values()
.stream()
.map(Type::fqTypeName)
.collect(Collectors.toSet());
this.forcedFullImports = Set.copyOf(builder.forcedFullImports);
this.identifiedInnerClasses = Map.copyOf(builder.identifiedInnerClasses);
}
static Builder builder() {
return new Builder();
}
String typeName(Type type, boolean includedImport) {
if (type instanceof TypeArgument) {
return type.fqTypeName();
}
Type checkedType = type.declaringClass().orElse(type);
String fullTypeName = checkedType.fqTypeName();
if (!includedImport) {
return fullTypeName;
}
String simpleTypeName = checkedType.simpleTypeName();
if (forcedFullImports.contains(fullTypeName)) {
return type.fqTypeName();
} else if (noImport.contains(fullTypeName) || imports.contains(fullTypeName)) {
return identifiedInnerClasses.getOrDefault(type.fqTypeName(), simpleTypeName);
}
return identifiedInnerClasses.getOrDefault(type.fqTypeName(), type.fqTypeName());
}
void writeImports(ModelWriter writer) throws IOException {
if (!importsToWrite.isEmpty()) {
for (List importGroup : importsToWrite) {
for (String importName : importGroup) {
writer.writeLine("import " + importName + ";");
}
if (!importGroup.isEmpty()) {
writer.writeSeparatorLine();
}
}
}
}
void writeStaticImports(ModelWriter writer) throws IOException {
if (!staticImportsToWrite.isEmpty()) {
for (List importGroup : staticImportsToWrite) {
for (String importName : importGroup) {
writer.writeLine("import static " + importName + ";");
}
if (!importGroup.isEmpty()) {
writer.writeSeparatorLine();
}
}
}
}
List imports() {
return importsToWrite.stream()
.flatMap(List::stream)
.toList();
}
static final class Builder implements io.helidon.common.Builder {
private final Set imports = new HashSet<>();
private final Set staticImports = new HashSet<>();
/**
* Class imports.
*/
private final Map finalImports = new HashMap<>();
/**
* Imports from "java.lang" package or classes within the same package.
* They should be monitored for name collisions, but not included in class imports.
*/
private final Map noImports = new HashMap<>();
/**
* Collection for class names with colliding simple names.
* The first registered will be used as import. The later ones have to be used as full names.
*/
private final Set forcedFullImports = new HashSet<>();
/**
* Map of known inner classes.
*/
private final Map identifiedInnerClasses = new HashMap<>();
private String packageName = "";
private String typeName;
private Builder() {
}
Builder packageName(String packageName) {
this.packageName = packageName;
return this;
}
Builder typeName(String typeName) {
this.typeName = typeName;
return this;
}
Builder type(TypeName type) {
this.typeName = type.className();
this.packageName = type.packageName();
return this;
}
Builder addImport(String type) {
return addImport(TypeName.create(type));
}
Builder addImport(Class type) {
return addImport(TypeName.create(type));
}
Builder addImport(TypeName type) {
return addImport(Type.fromTypeName(type.genericTypeName()));
}
Builder addImport(Type type) {
imports.add(type);
return this;
}
Builder addStaticImport(String type) {
return addStaticImport(TypeName.create(type));
}
Builder addStaticImport(Class type) {
return addStaticImport(TypeName.create(type));
}
Builder addStaticImport(TypeName type) {
staticImports.add(Type.fromTypeName(type));
return this;
}
Builder from(ImportOrganizer.Builder builder) {
this.imports.addAll(builder.imports);
this.staticImports.addAll(builder.staticImports);
return this;
}
@Override
public ImportOrganizer build() {
if (typeName == null) {
throw new ClassModelException("Import organizer requires to have built type name specified.");
}
finalImports.clear();
forcedFullImports.clear();
noImports.clear();
resolveFinalImports();
return new ImportOrganizer(this);
}
private void resolveFinalImports() {
for (Type type : imports) {
//If processed type is inner class, we will be importing parent class
Type typeToProcess = type.declaringClass().orElse(type);
String fqTypeName = typeToProcess.fqTypeName();
String typePackage = typeToProcess.packageName();
String typeSimpleName = typeToProcess.simpleTypeName();
if (type.innerClass()) {
if (typeToProcess.innerClass()) {
identifiedInnerClasses.put(type.fqTypeName(), fqTypeName + "." + type.simpleTypeName());
} else {
identifiedInnerClasses.put(type.fqTypeName(), typeSimpleName + "." + type.simpleTypeName());
}
}
if (typePackage.equals("java.lang")) {
//imported class is from java.lang package -> automatically imported
processImportJavaLang(type, fqTypeName, typeSimpleName);
} else if (this.packageName.equals(typePackage)) {
processImportSamePackage(type, fqTypeName, typeSimpleName);
} else if (finalImports.containsKey(typeSimpleName)
&& !finalImports.get(typeSimpleName).equals(fqTypeName)) {
//If there is imported class with this simple name already, but it is not in the same package as this one
//add this newly added among the forced full names
forcedFullImports.add(fqTypeName);
} else if (noImports.containsKey(typeSimpleName)) {
//There is already class with the same name present in the package we are generating to
//or imported from java.lang
forcedFullImports.add(fqTypeName);
} else if (typeName.equals(typeSimpleName)) {
//If the processed class name is the same as the one currently built.
forcedFullImports.add(fqTypeName);
} else if (!typePackage.isEmpty()) {
finalImports.put(typeSimpleName, fqTypeName);
}
}
}
private void processImportJavaLang(Type type, String typeName, String typeSimpleName) {
//new class is from java.lang package
if (finalImports.containsKey(typeSimpleName)) {
//some other class with the same name is already being imported (but with the different package)
//remove that previously added class from imports and place it to the list of forced full class names
forcedFullImports.add(finalImports.remove(typeSimpleName));
} else if (noImports.containsKey(typeSimpleName)
&& !noImports.get(typeSimpleName).fqTypeName().equals(typeName)) {
//if there is already class with the same name, but different package, added among the imports,
// and it does not need import specified (java.lang and the same package), remove it from the exception
// list and add it among forced imports.
forcedFullImports.add(typeName);
return;
}
noImports.put(typeSimpleName, type);
}
private void processImportSamePackage(Type type, String typeName, String typeSimpleName) {
String simpleName = typeSimpleName;
if (this.typeName.equals(simpleName)) {
simpleName = type.simpleTypeName();
if (noImports.containsKey(simpleName)
&& !noImports.get(simpleName).fqTypeName().equals(type.fqTypeName())) {
forcedFullImports.add(noImports.remove(simpleName).fqTypeName());
}
}
if (finalImports.containsKey(simpleName)) {
//There is a class among general imports which match the currently added class name.
forcedFullImports.add(finalImports.remove(simpleName));
noImports.put(simpleName, type);
} else if (noImports.containsKey(simpleName)) {
//There is already specialized handling of a class with this name
if (!noImports.get(simpleName).fqTypeName().equals(typeName)) {
forcedFullImports.add(noImports.remove(simpleName).fqTypeName());
noImports.put(simpleName, type);
}
} else {
noImports.put(simpleName, type);
}
}
}
}