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io.hyperfoil.codegen.SkeletonMojo Maven / Gradle / Ivy
package io.hyperfoil.codegen;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.lang.reflect.WildcardType;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import java.util.stream.Stream;
import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
import org.apache.maven.plugins.annotations.LifecyclePhase;
import org.apache.maven.plugins.annotations.Mojo;
import org.apache.maven.plugins.annotations.Parameter;
import org.kohsuke.MetaInfServices;
import com.github.javaparser.StaticJavaParser;
import com.github.javaparser.ast.CompilationUnit;
import com.github.javaparser.ast.ImportDeclaration;
import com.github.javaparser.ast.Modifier.Keyword;
import com.github.javaparser.ast.body.ClassOrInterfaceDeclaration;
import com.github.javaparser.ast.body.MethodDeclaration;
import com.github.javaparser.ast.expr.ClassExpr;
import com.github.javaparser.ast.expr.SingleMemberAnnotationExpr;
import com.github.javaparser.ast.expr.StringLiteralExpr;
import com.github.javaparser.ast.stmt.BlockStmt;
import com.github.javaparser.ast.type.ClassOrInterfaceType;
import com.github.javaparser.ast.type.PrimitiveType;
import com.github.javaparser.ast.type.ReferenceType;
import com.github.javaparser.ast.type.TypeParameter;
import com.github.javaparser.ast.type.VoidType;
import io.hyperfoil.api.config.Name;
import io.hyperfoil.api.config.RunHook;
import io.hyperfoil.api.config.Step;
import io.hyperfoil.api.config.StepBuilder;
import io.hyperfoil.api.processor.Processor;
import io.hyperfoil.api.processor.RawBytesHandler;
import io.hyperfoil.api.session.Action;
import io.hyperfoil.http.api.HeaderHandler;
import io.hyperfoil.http.api.StatusHandler;
@Mojo(name = "skeleton", defaultPhase = LifecyclePhase.GENERATE_SOURCES)
public class SkeletonMojo extends AbstractMojo {
private static final Map TYPES = new HashMap<>();
@Parameter(defaultValue = "${project.basedir}/src/main/java")
private String output;
@Parameter(alias = "package", property = "skeleton.package")
private String pkg;
@Parameter(property = "skeleton.name")
private String name;
@Parameter(property = "skeleton.type")
private String type;
private BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
static {
TYPES.put("step", new SkeletonType("Step", Step.class, StepBuilder.class));
TYPES.put("action", new SkeletonType("Action", Action.class, Action.Builder.class));
TYPES.put("requestprocessor", new SkeletonType("Processor", Processor.class, Processor.Builder.class));
TYPES.put("headerhandler", new SkeletonType("HeaderHandler", HeaderHandler.class, HeaderHandler.Builder.class));
TYPES.put("statushandler", new SkeletonType("StatusHandler", StatusHandler.class, StatusHandler.Builder.class));
TYPES.put("rawbyteshandler", new SkeletonType("RawBytesHandler", RawBytesHandler.class, RawBytesHandler.Builder.class));
TYPES.put("hook", new SkeletonType("Hook", RunHook.class, RunHook.Builder.class));
}
private String clazzName;
private Map genericMapping = Collections.emptyMap();
private CompilationUnit unit;
@Override
public void execute() throws MojoExecutionException, MojoFailureException {
try {
pkg = checkPropertyInteractive("Package", pkg);
name = checkPropertyInteractive("Name", name);
do {
type = checkPropertyInteractive("Type (one of " + TYPES.keySet() + ")", type);
type = type.toLowerCase(Locale.US);
} while (!TYPES.containsKey(type));
} catch (IOException e) {
throw new MojoFailureException("Cannot read input parameters", e);
}
File pkgDir = Paths.get(output).resolve(pkg.replaceAll("\\.", File.separator)).toFile();
if (pkgDir.exists()) {
if (!pkgDir.isDirectory()) {
throw new MojoFailureException(pkgDir + " is not a directory.");
}
} else if (!pkgDir.mkdirs()) {
throw new MojoExecutionException("Cannot create " + pkgDir);
}
SkeletonType st = TYPES.get(type);
assert st != null;
if (st.iface instanceof ParameterizedTypeImpl) {
genericMapping = ((ParameterizedTypeImpl) st.iface).arguments;
}
unit = new CompilationUnit(pkg);
unit.addImport(Name.class);
unit.addImport(MetaInfServices.class);
clazzName = Character.toUpperCase(name.charAt(0)) + name.substring(1) + st.suffix;
ClassOrInterfaceDeclaration clazz = unit.addClass(clazzName);
setExtendsOrImplements(clazz, st.iface);
stubMethods(st.iface, clazz, new HashSet<>());
ClassOrInterfaceDeclaration builder = new ClassOrInterfaceDeclaration();
setExtendsOrImplements(builder, st.builder);
builder.addAnnotation(new SingleMemberAnnotationExpr(new com.github.javaparser.ast.expr.Name("MetaInfServices"),
new ClassExpr(getClassOrInterfaceType(st.builder))))
.addAnnotation(new SingleMemberAnnotationExpr(new com.github.javaparser.ast.expr.Name("Name"), new StringLiteralExpr(name)));
clazz.addMember(builder.setName("Builder").setModifiers(Keyword.PUBLIC, Keyword.STATIC));
stubMethods(st.builder, builder, new HashSet<>());
unit.getImports().sort(Comparator.comparing(ImportDeclaration::toString));
Path javaFile = pkgDir.toPath().resolve(clazzName + ".java");
try {
Files.write(javaFile, unit.toString().getBytes(StandardCharsets.UTF_8));
} catch (IOException e) {
throw new MojoExecutionException("Cannot write to file " + javaFile, e);
}
}
private void setExtendsOrImplements(ClassOrInterfaceDeclaration clazz, Type supertype) {
if (getRaw(supertype).isInterface()) {
clazz.addImplementedType(getClassOrInterfaceType(supertype));
} else {
clazz.addExtendedType(getClassOrInterfaceType(supertype));
}
}
private void stubMethods(Type type, ClassOrInterfaceDeclaration clazz, Set implementedMethods) {
if (type == null) {
return;
}
Class raw = getRaw(type);
if (raw == Object.class) {
return;
}
for (Method m : raw.getDeclaredMethods()) {
if (m.isDefault() || m.isSynthetic() || m.isBridge() || Modifier.isStatic(m.getModifiers())) {
continue;
} else if (!Modifier.isAbstract(m.getModifiers())) {
// crude without signature
implementedMethods.add(m.getName());
continue;
} else if (implementedMethods.contains(m.getName())) {
continue;
}
MethodDeclaration method = clazz.addMethod(m.getName(), Keyword.PUBLIC);
if (m.getName().equals("build") && m.getReturnType() != List.class) {
method.setType(new ClassOrInterfaceType(null, clazzName));
} else {
method.setType(getType(m.getGenericReturnType()));
}
method.addMarkerAnnotation("Override");
Type[] genericParameterTypes = m.getGenericParameterTypes();
Set paramNames = new HashSet<>();
for (int i = 0; i < genericParameterTypes.length; i++) {
Type param = genericParameterTypes[i];
method.addParameter(getType(param), paramName(param, paramNames));
}
BlockStmt body = new BlockStmt();
method.setBody(body);
if (m.getReturnType() == boolean.class) {
body.addStatement("return false;");
} else if (m.getReturnType() == int.class || m.getReturnType() == long.class) {
body.addStatement("return 0;");
} else if (m.getReturnType() != void.class) {
body.addStatement("return null;");
}
implementedMethods.add(m.getName());
}
stubMethods(raw.getSuperclass(), clazz, implementedMethods);
for (Class iface : raw.getInterfaces()) {
stubMethods(iface, clazz, implementedMethods);
}
}
private Class getRaw(Type type) {
Class raw;
if (type instanceof Class) {
raw = (Class) type;
} else if (type instanceof ParameterizedType) {
raw = (Class) ((ParameterizedType) type).getRawType();
} else {
throw new IllegalStateException();
}
return raw;
}
private String paramName(Type param, Set names) {
String name;
if (param instanceof Class && ((Class) param).isPrimitive()) {
name = String.valueOf(param.getTypeName().charAt(0));
} else {
String tname = param.getTypeName();
int genericsStart = tname.indexOf('<');
if (genericsStart > 0) {
tname = tname.substring(0, genericsStart);
}
int lastDot = tname.lastIndexOf('.');
int lastDollar = tname.lastIndexOf('$');
if (lastDot > 0 || lastDollar > 0) {
tname = tname.substring(Math.max(lastDot, lastDollar) + 1);
}
name = Character.toLowerCase(tname.charAt(0)) + tname.substring(1);
}
while (!names.add(name)) {
int lastDigit = name.length() - 1;
while (lastDigit >= 0 && Character.isDigit(name.charAt(lastDigit))) {
--lastDigit;
}
lastDigit++;
if (lastDigit < name.length()) {
int suffix = Integer.parseInt(name.substring(lastDigit));
name = name.substring(0, lastDigit) + suffix;
} else {
name = name + "2";
}
}
return name;
}
private ClassOrInterfaceType getClassOrInterfaceType(Type type) {
if (type instanceof Class) {
ClassOrInterfaceType iface = StaticJavaParser.parseClassOrInterfaceType(type.getTypeName().replaceAll("\\$", "."));
ClassOrInterfaceType parentScope = iface.getScope().orElse(null);
if (parentScope != null && Character.isUpperCase(parentScope.getName().asString().charAt(0))) {
addImport(parentScope);
parentScope.removeScope();
} else {
addImport(iface);
iface.removeScope();
}
return iface;
} else if (type instanceof ParameterizedType) {
ClassOrInterfaceType iface = StaticJavaParser.parseClassOrInterfaceType(((ParameterizedType) type).getRawType().getTypeName());
addImport(iface);
com.github.javaparser.ast.type.Type[] args = Stream.of(((ParameterizedType) type).getActualTypeArguments())
.map(t -> getType(t)).toArray(com.github.javaparser.ast.type.Type[]::new);
iface.setTypeArguments(args);
return iface.removeScope();
} else {
throw new IllegalStateException("Unexpected type " + type);
}
}
private void addImport(ClassOrInterfaceType iface) {
if (!iface.getScope().map(ClassOrInterfaceType::asString).orElse("").equals("java.lang")) {
unit.addImport(iface.asString());
}
}
private com.github.javaparser.ast.type.Type getType(Type type) {
if (type instanceof Class) {
if (((Class) type).isPrimitive()) {
if (type == void.class) {
return new VoidType();
}
PrimitiveType.Primitive primitive = Stream.of(PrimitiveType.Primitive.values())
.filter(p -> p.name().toLowerCase().equals(type.getTypeName()))
.findFirst().orElseThrow(() -> new IllegalStateException("No primitive for " + type));
return new PrimitiveType(primitive);
}
} else if (type instanceof TypeVariable) {
String name = ((TypeVariable) type).getName();
Type actual = genericMapping.get(name);
if (actual != null) {
return getType(actual);
}
return new TypeParameter(name);
} else if (type instanceof WildcardType) {
return new com.github.javaparser.ast.type.WildcardType()
.setSuperType(getBound(((WildcardType) type).getLowerBounds()))
.setExtendedType(getBound(((WildcardType) type).getUpperBounds()));
}
return getClassOrInterfaceType(type);
}
private com.github.javaparser.ast.type.ReferenceType getBound(Type[] types) {
if (types.length == 0) {
return null;
} else if (types.length == 1) {
return (ReferenceType) getType(types[0]);
} else {
throw new UnsupportedOperationException();
}
}
private void addImport(Type type) {
if (type instanceof ParameterizedType) {
addImport(((ParameterizedType) type).getRawType());
for (Type arg : ((ParameterizedType) type).getActualTypeArguments()) {
addImport(arg);
}
} else {
unit.addImport(type.getTypeName());
}
}
private String checkPropertyInteractive(String name, String value) throws IOException {
while (value == null || value.isEmpty()) {
System.out.print(name + ": ");
System.out.flush();
value = reader.readLine();
}
return value;
}
private static class SkeletonType {
private final Type iface;
private final Class builder;
private final String suffix;
private SkeletonType(String suffix, Type iface, Class builder, String... blacklistedMethods) {
this.suffix = suffix;
this.iface = iface;
this.builder = builder;
}
}
private static class ParameterizedTypeImpl implements ParameterizedType {
private final Class raw;
private final LinkedHashMap arguments;
private ParameterizedTypeImpl(Class raw, LinkedHashMap arguments) {
this.raw = raw;
this.arguments = arguments;
}
@Override
public Type[] getActualTypeArguments() {
return arguments.values().toArray(new Type[0]);
}
@Override
public Type getRawType() {
return raw;
}
@Override
public Type getOwnerType() {
return null;
}
}
private static class MapBuilder {
private final LinkedHashMap map = new LinkedHashMap<>();
public MapBuilder add(K key, V value) {
map.put(key, value);
return this;
}
public LinkedHashMap map() {
return map;
}
}
}
