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// Copyright 2020 Goldman Sachs
//
// 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.

import meta::external::language::java::metamodel::*;
import meta::external::language::java::metamodel::project::*;

/*
   The modeling strategy is to follow Java reflection
   Except for types (introduced PrimitiveType and FunctionType)
   That's why primitive and interface are flags on Class
*/

Class meta::external::language::java::metamodel::Importable
{
}

Class meta::external::language::java::metamodel::Package extends meta::external::language::java::metamodel::AnnotatedElement, meta::external::language::java::metamodel::Importable
{
   <> name : String[1];
   fullPath: String[0..1];
}

Association meta::external::language::java::metamodel::PackageChildren
{
   <> parent : meta::external::language::java::metamodel::Package[0..1];
   children : meta::external::language::java::metamodel::Package[*];
}

Enum meta::external::language::java::metamodel::Modifier
{
   Abstract,
   Final,
   Interface,
   Native,
   Private,
   Protected,
   Public,
   Static,
   Strict,
   Synchronized,
   Transient,
   Volatile,
   Default
}

Class meta::external::language::java::metamodel::Type
{
}

Class meta::external::language::java::metamodel::ParameterizedType extends meta::external::language::java::metamodel::Type
{
   <> rawType : meta::external::language::java::metamodel::Type[1];
   <> typeArguments : meta::external::language::java::metamodel::Type[*];
}

Class meta::external::language::java::metamodel::WildcardType extends meta::external::language::java::metamodel::Type
{
   <> lowerBounds : meta::external::language::java::metamodel::Type[*];
   <> upperBounds : meta::external::language::java::metamodel::Type[*];
}

Class meta::external::language::java::metamodel::Member
{
   modifiers : Modifier[*];
}

Class meta::external::language::java::metamodel::Field extends meta::external::language::java::metamodel::AnnotatedElement, Member
[
   $this.value->isEmpty() || $this.valueCode->isEmpty()
]
{
   name : String[1];
   type : meta::external::language::java::metamodel::Type[1];
   value: String[0..1];
   valueCode: Code[0..1];
}

Class meta::external::language::java::metamodel::Method extends meta::external::language::java::metamodel::AnnotatedElement, Member, GenericDeclaration
[
   $this.body->isEmpty() || $this.bodyCode->isEmpty()
]
{
   name : String[1];
   parameters : meta::external::language::java::metamodel::Parameter[*];
   returnType : meta::external::language::java::metamodel::Type[1];
   body : String[0..1]; // String for now ... will model expressions later
   bodyCode: Code[0..1];
   
   nullResultPossible : Boolean[0..1];
   functionType : meta::external::language::java::metamodel::FunctionType[0..1];
}

Class meta::external::language::java::metamodel::Parameter extends meta::external::language::java::metamodel::AnnotatedElement
{
   name : String[1];
   type : meta::external::language::java::metamodel::Type[1];
}

Class meta::external::language::java::metamodel::Constructor extends meta::external::language::java::metamodel::AnnotatedElement, Member, GenericDeclaration
[
   $this.body->isEmpty() || $this.bodyCode->isEmpty()
]
{
   parameters : meta::external::language::java::metamodel::Parameter[*];
   body : String[0..1]; // String for now ... will model expressions later
   bodyCode: Code[0..1];
}

Class meta::external::language::java::metamodel::TypeVariable extends meta::external::language::java::metamodel::Type
{
   <> bounds : meta::external::language::java::metamodel::Type[*];
   <> name : String[1];
}

Class meta::external::language::java::metamodel::GenericDeclaration
{
   typeParameters : TypeVariable[*];
}

Class meta::external::language::java::metamodel::AnnotatedElement
{
   annotations : meta::external::language::java::metamodel::Annotation[*];
   javaDoc: String[0..1];
}

Class meta::external::language::java::metamodel::Annotation
{

}

Class meta::external::language::java::metamodel::Array extends meta::external::language::java::metamodel::Type, meta::external::language::java::metamodel::AnnotatedElement
{
   <> rawType : meta::external::language::java::metamodel::Type[1];
}

Class meta::external::language::java::metamodel::Class extends meta::external::language::java::metamodel::Type, meta::external::language::java::metamodel::GenericDeclaration, meta::external::language::java::metamodel::AnnotatedElement, meta::external::language::java::metamodel::Importable
{
   <> simpleName : String[1];
   <> package : meta::external::language::java::metamodel::Package[1];

   modifiers : Modifier[*];
   interfaces : meta::external::language::java::metamodel::Type[*];
   superType : meta::external::language::java::metamodel::Type[0..1];

   constructors : Constructor[*];
   fields : Field[*];
   methods : meta::external::language::java::metamodel::Method[*];

   additionalImports : String[*];
   projectionParentName : String[0..1]; // Java doesn't really have an equivalent AFAIK but we need this
}

Class meta::external::language::java::metamodel::PrimitiveType extends meta::external::language::java::metamodel::Type
{
   <> simpleName : String[1];
}

// Not really a type in Java but used to carry type information for lambdas during code generation
Class meta::external::language::java::metamodel::FunctionType extends meta::external::language::java::metamodel::Type
{
   <> parameterTypes : meta::external::language::java::metamodel::Type[*];
   <> returnType     : meta::external::language::java::metamodel::Type[1];
   nullResultPossible : Boolean[0..1];
}

Class meta::external::language::java::metamodel::Enumeration extends meta::external::language::java::metamodel::Class
{
   enumeration : EnumerationEntry[*];
}

Class meta::external::language::java::metamodel::EnumerationEntry extends meta::external::language::java::metamodel::AnnotatedElement
[
   $this.value->isEmpty() || $this.arguments->isEmpty()
]
{
   name      : String[1];
   value     : String[0..1];
   arguments : Code[*];
}

function meta::external::language::java::metamodel::assignmentOperators():String[*]
{
   ['=','+=','-=','*=','/=','%=','&=','^=','|=','<<=','>>=','>>>='];
}

Profile meta::external::language::java::metamodel::annotations::AnnotationJavaInfo
{
  tags : [javaClass];
}

Class
{
  meta::external::language::java::metamodel::annotations::AnnotationJavaInfo.javaClass = 'com.fasterxml.jackson.annotation.JsonIgnoreProperties'
}
meta::external::language::java::metamodel::annotations::json::JsonIgnoreProperties extends meta::external::language::java::metamodel::Annotation
{
   ignoreUnknown : Boolean[1];
   value: String[*];
}

Class
{
  meta::external::language::java::metamodel::annotations::AnnotationJavaInfo.javaClass = 'com.fasterxml.jackson.annotation.JsonIgnore'
}
meta::external::language::java::metamodel::annotations::json::JsonIgnore extends meta::external::language::java::metamodel::Annotation
{
}

Class
{
  meta::external::language::java::metamodel::annotations::AnnotationJavaInfo.javaClass = 'com.fasterxml.jackson.annotation.JsonAnyGetter'
}
meta::external::language::java::metamodel::annotations::json::JsonAnyGetter extends meta::external::language::java::metamodel::Annotation
{
}

Class
{
  meta::external::language::java::metamodel::annotations::AnnotationJavaInfo.javaClass = 'com.fasterxml.jackson.annotation.JsonAnySetter'
}
meta::external::language::java::metamodel::annotations::json::JsonAnySetter extends meta::external::language::java::metamodel::Annotation
{

}

Class 
{
  meta::external::language::java::metamodel::annotations::AnnotationJavaInfo.javaClass = 'com.fasterxml.jackson.annotation.JsonValue'
}
meta::external::language::java::metamodel::annotations::json::JsonValue extends meta::external::language::java::metamodel::Annotation
{
}

Class meta::external::language::java::metamodel::annotations::json::JsonCreator extends meta::external::language::java::metamodel::Annotation
{
}

Class
{
  meta::external::language::java::metamodel::annotations::AnnotationJavaInfo.javaClass = 'com.fasterxml.jackson.annotation.JsonProperty'
}
meta::external::language::java::metamodel::annotations::json::JsonProperty extends meta::external::language::java::metamodel::Annotation
{
   value : String[0..1];
   required : Boolean[0..1];
}

Class
{
  meta::external::language::java::metamodel::annotations::AnnotationJavaInfo.javaClass = 'com.fasterxml.jackson.databind.annotation.JsonSerialize'
}
meta::external::language::java::metamodel::annotations::json::JsonSerialize extends meta::external::language::java::metamodel::Annotation
{
   as : meta::external::language::java::metamodel::Class[0..1];
   using : meta::external::language::java::metamodel::Class[0..1];
   nullsUsing: meta::external::language::java::metamodel::Class[0..1];
}

Class
{
  meta::external::language::java::metamodel::annotations::AnnotationJavaInfo.javaClass = 'com.fasterxml.jackson.databind.annotation.JsonDeserialize'
}
meta::external::language::java::metamodel::annotations::json::JsonDeserialize extends meta::external::language::java::metamodel::Annotation
{
   as : meta::external::language::java::metamodel::Class[0..1];
   using : meta::external::language::java::metamodel::Class[0..1];
   keyUsing : meta::external::language::java::metamodel::Class[0..1];
   contentUsing : meta::external::language::java::metamodel::Class[0..1];
}

Class meta::external::language::java::metamodel::annotations::json::EnumValue
{
   value: String[1];
}

Class
{
  meta::external::language::java::metamodel::annotations::AnnotationJavaInfo.javaClass = 'com.fasterxml.jackson.annotation.JsonSubTypes'
}
meta::external::language::java::metamodel::annotations::json::JsonSubTypes extends meta::external::language::java::metamodel::Annotation
{
   subTypes : meta::external::language::java::metamodel::annotations::json::JsonSubType[*];
}

Class meta::external::language::java::metamodel::annotations::json::JsonSubType
{
   name  : String[0..1];
   value : String[1];
}


Class
{
  meta::external::language::java::metamodel::annotations::AnnotationJavaInfo.javaClass = 'com.fasterxml.jackson.annotation.JsonTypeInfo'
}
meta::external::language::java::metamodel::annotations::json::JsonTypeInfo extends meta::external::language::java::metamodel::Annotation
{
    use        : meta::external::language::java::metamodel::annotations::json::EnumValue[1];
    include    : meta::external::language::java::metamodel::annotations::json::EnumValue[0..1];
    id         : meta::external::language::java::metamodel::annotations::json::EnumValue[0..1];
    property   : String[0..1];
    visible    : Boolean[0..1];
    defaultImpl: meta::external::language::java::metamodel::annotations::json::EnumValue[0..1];
}

Class meta::external::language::java::metamodel::annotations::json::JsonAutoDetect extends meta::external::language::java::metamodel::Annotation
{
   fieldVisibility: meta::external::language::java::metamodel::annotations::json::EnumValue[1];
   getterVisibility: meta::external::language::java::metamodel::annotations::json::EnumValue[1];
   setterVisibility: meta::external::language::java::metamodel::annotations::json::EnumValue[1];
}

Class
{
  meta::external::language::java::metamodel::annotations::AnnotationJavaInfo.javaClass = 'com.fasterxml.jackson.annotation.JsonInclude'
}
meta::external::language::java::metamodel::annotations::json::JsonInclude extends meta::external::language::java::metamodel::Annotation
{
   value : meta::external::language::java::metamodel::annotations::json::EnumValue[1];
}

Class
{
  meta::external::language::java::metamodel::annotations::AnnotationJavaInfo.javaClass = 'com.fasterxml.jackson.annotation.JsonTypeName'
}
meta::external::language::java::metamodel::annotations::json::JsonTypeName extends meta::external::language::java::metamodel::Annotation
{
   value : String[1];
}
Class 
{
  meta::external::language::java::metamodel::annotations::AnnotationJavaInfo.javaClass = 'javax.annotation.Generated'
}
meta::external::language::java::metamodel::annotations::generated::Generated extends meta::external::language::java::metamodel::Annotation
{
   value : String[1];
   comments: String[0..1];
}

Class 
{
  meta::external::language::java::metamodel::annotations::AnnotationJavaInfo.javaClass = 'java.lang.Override'
}
meta::external::language::java::metamodel::annotations::override::Override extends meta::external::language::java::metamodel::Annotation
{
}

Class meta::external::language::java::metamodel::annotations::jsi::ExposeToSlang extends meta::external::language::java::metamodel::Annotation
{
}

Class meta::external::language::java::metamodel::annotations::jsi::TypedStructure extends meta::external::language::java::metamodel::Annotation
{
}

Class meta::external::language::java::metamodel::annotations::jsi::ExposeInSlangScope extends meta::external::language::java::metamodel::Annotation
{
   value : String[1];
}

Class
{
  meta::external::language::java::metamodel::annotations::AnnotationJavaInfo.javaClass = 'javax.validation.constraints.NotNull'
}
meta::external::language::java::metamodel::annotations::java::validation::constraints::NotNull extends meta::external::language::java::metamodel::Annotation
{
}

Class meta::external::language::java::metamodel::annotations::java::validation::constraints::Valid extends meta::external::language::java::metamodel::Annotation
{
}

Class meta::external::language::java::metamodel::annotations::java::validation::constraints::Size extends meta::external::language::java::metamodel::Annotation
{
   min      :Integer[0..1];
   max      :Integer[0..1];
   message  :String[0..1];
}

Class meta::external::language::java::metamodel::annotations::java::validation::constraints::Min extends meta::external::language::java::metamodel::Annotation
{
   value    :Integer[1];
   message  :String[0..1];
}

Class meta::external::language::java::metamodel::annotations::java::validation::constraints::Max extends meta::external::language::java::metamodel::Annotation
{
   value    :Integer[1];
   message  :String[0..1];
}


Class meta::external::language::java::metamodel::annotations::immutables::value::Immutable extends meta::external::language::java::metamodel::Annotation
{
}

Class meta::external::language::java::metamodel::annotations::immutables::value::Auxiliary extends meta::external::language::java::metamodel::Annotation
{
}

Class meta::external::language::java::metamodel::annotations::immutables::value::Style extends meta::external::language::java::metamodel::Annotation
{
   init: String[0..1];
   get: String[0..1];
   set: String[0..1];
   typeAbstract: String[0..1];
   typeImmutable: String[0..1];
   builder: String[0..1];
   build: String[0..1];
   strictBuilder: Boolean[0..1];
   optionalAcceptNullable: Boolean[0..1];
   jdkOnly: Boolean[0..1];
}

Class meta::external::language::java::metamodel::annotations::immutables::value::Default extends meta::external::language::java::metamodel::Annotation
{
}

Class meta::external::language::java::metamodel::annotations::immutables::value::Check extends meta::external::language::java::metamodel::Annotation
{
}

Class meta::external::language::java::metamodel::annotations::SuppressWarnings extends meta::external::language::java::metamodel::Annotation
{
   value: String[1];
}

Profile meta::external::language::java::metamodel::profiles::generation {
   stereotypes: [opaque, container, reference];
}

Profile meta::external::language::java::metamodel::profiles::temporalType {
   stereotypes: [Instant, LocalDate, LocalDateTime, LocalTime, OffsetDateTime, OffsetTime, ZonedDateTime];
}

Profile meta::external::language::java::metamodel::profiles::collectionType {
   stereotypes: [List, Set, Map];
}

Profile meta::external::language::java::metamodel::profiles::integerType {
   stereotypes: [Integer, Long];
}

Profile meta::external::language::java::metamodel::profiles::floatType {
   stereotypes: [Float, BigDecimal, Double];
}

Profile meta::external::language::java::metamodel::profiles::stringType {
   stereotypes: [byteArray];
}

Profile meta::external::language::java::metamodel::profiles::enumValue {
   stereotypes: [Default];
   tags:[name];
}

Profile meta::external::language::java::metamodel::profiles::jsonProperty {
   stereotypes: [customName, ignoreProperties, ignoreProperty];
   tags: [value];
}

Profile meta::external::language::java::metamodel::profiles::immutables {
   stereotypes: [Auxiliary];
}

Class meta::external::language::java::metamodel::Code
{
   <> type : meta::external::language::java::metamodel::Type[1];
   requires              : CodeDependency[*];
}

Class meta::external::language::java::metamodel::SimpleCode extends Code
{
   <> code : String[1];
}

Class meta::external::language::java::metamodel::Statement extends Code
{
}

Class meta::external::language::java::metamodel::Null extends Code
{
}

Class meta::external::language::java::metamodel::This extends Code
{
}

Class meta::external::language::java::metamodel::Super extends Code
{
}

Class meta::external::language::java::metamodel::Literal extends Code
{
   <> literal : String[1];
}

Class meta::external::language::java::metamodel::Block extends Statement
{
   <> statements : Code[*];
}

Class meta::external::language::java::metamodel::ExpressionStatement extends Statement
{
   <> expression : Code[1];
}

Class meta::external::language::java::metamodel::Variable extends Code
{
   <> name : String[1];
}

Class meta::external::language::java::metamodel::CodeParameter extends Variable, meta::external::language::java::metamodel::Parameter
{
}

Class meta::external::language::java::metamodel::InfixExpression extends Code
{
   <> left  : Code[1];
   <> op    : String[1];
   <> right : Code[1];
}

Class meta::external::language::java::metamodel::PrefixExpression extends Code
{
   <> op         : String[1];
   <> expression : Code[1];
}

Class meta::external::language::java::metamodel::PostfixExpression extends Code
{
   <> expression : Code[1];
   <> op         : String[1];
}

Class meta::external::language::java::metamodel::Conditional extends Code
{
   <> test : Code[1];
   <> then : Code[1];
   <> else : Code[1];
}

Class meta::external::language::java::metamodel::InstanceOf extends Code
{
   <> expression : Code[1];
   <> class      : meta::external::language::java::metamodel::Class[1];
}

Class meta::external::language::java::metamodel::LocalVariableDeclaration extends Statement
{
   <> modifiers    : meta::external::language::java::metamodel::Modifier[*];
   <> variableName : String[1];
   <> initializer  : Code[0..1];
}

Class meta::external::language::java::metamodel::If extends Statement
{
   <> test : Code[1];
   <> then : Code[1];
   <> else : Code[0..1];
}

Class meta::external::language::java::metamodel::For extends Statement
{
   <> init   : Code[0..1];
   <> test   : Code[0..1];
   <> update : Code[0..1];
   <> body   : Code[1];
}

Class meta::external::language::java::metamodel::ForEach extends Statement
{
   <> parameter  : meta::external::language::java::metamodel::CodeParameter[1];
   <> collection : Code[1];
   <> body       : Code[1];
}

Class meta::external::language::java::metamodel::While extends Statement
{
   <> test : Code[1];
   <> then : Code[1];
}

Class meta::external::language::java::metamodel::DoWhile extends Statement
{
   <> do    : Code[1];
   <> while : Code[1];
}

Class meta::external::language::java::metamodel::Try extends Statement
{
   <> try     : Code[1];
   <> catches : Catch[*];
   <> finally : Finally[0..1];
}

Class meta::external::language::java::metamodel::Catch extends Code
{
   <> parameter : meta::external::language::java::metamodel::CodeParameter[1];
   <> clause    : Code[1];
}

Class meta::external::language::java::metamodel::Finally extends Code
{
   <> clause    : Code[1];
}

Class meta::external::language::java::metamodel::Return extends Statement
{
   <> expression : Code[0..1];
}

Class meta::external::language::java::metamodel::Throw extends Statement
{
   <> expression : Code[1];
}

Class meta::external::language::java::metamodel::New extends Code
{
   <> typeArguments  : meta::external::language::java::metamodel::Type[*];
   <> arguments      : Code[*];
}

Class meta::external::language::java::metamodel::NewAnonymous extends New
{
   <> methods  : meta::external::language::java::metamodel::CodeMethod[*];
}

Class meta::external::language::java::metamodel::CodeMethod extends Code
{
   <> modifiers  : meta::external::language::java::metamodel::Modifier[*];
   <> name       : String[1];
   <> parameters : meta::external::language::java::metamodel::CodeParameter[*];
   <> body       : Code[1];
}

Class meta::external::language::java::metamodel::ArrayAccess extends Code
{
   <> array : Code[1];
   <> index : Code[1];
}

Class meta::external::language::java::metamodel::Cast extends Code
{
   <> expression : Code[1];
}

Class meta::external::language::java::metamodel::CastProxy extends Cast
{
   <> proxy : Code[1];
}

Class meta::external::language::java::metamodel::MethodCall extends Code
{
   <> instance       : Code[1];
   <> typeArguments  : meta::external::language::java::metamodel::Type[*];
   <> methodName     : String[1];
   <> arguments      : Code[*];
}

Class meta::external::language::java::metamodel::ConstructorCall extends Statement
{
   <> arguments      : Code[*];
}

Class meta::external::language::java::metamodel::ThisConstructorCall extends ConstructorCall
{  
}

Class meta::external::language::java::metamodel::SuperConstructorCall extends ConstructorCall
{
}

Class meta::external::language::java::metamodel::FieldAccess extends Code
{
   <> instance  : Code[1];
   <> fieldName : String[1];
}

Class meta::external::language::java::metamodel::MethodReference extends Code
{
   <> instance   : Code[1];
   <> methodName : String[1];
}

Class meta::external::language::java::metamodel::StaticMethodCall extends Code
{
   <> class          : meta::external::language::java::metamodel::Type[1];
   <> typeArguments  : meta::external::language::java::metamodel::Type[*];
   <> methodName     : String[1];
   <> arguments      : Code[*];
}

Class meta::external::language::java::metamodel::StaticFieldAccess extends Code
{
   <> class     : meta::external::language::java::metamodel::Type[1];
   <> fieldName : String[1];
}

Class meta::external::language::java::metamodel::StaticMethodReference extends Code
{
   <> class      : meta::external::language::java::metamodel::Type[1];
   <> methodName : String[1];
}

Class meta::external::language::java::metamodel::Lambda extends Code
{
   <> parameters : meta::external::language::java::metamodel::CodeParameter[*];
   <> expression : Code[1];
}

Class meta::external::language::java::metamodel::DeferredStreamResolve extends Code
{
   <> stream : Code[1];
}

Class meta::external::language::java::metamodel::CodeDependency
{
   <> name : String[1];
   stateUpdater          : Function<{CodeDependencyResolutionState[1]->CodeDependencyResolutionState[1]}>[1];
}

Class meta::external::language::java::metamodel::CodeDependencyResolutionState
{
   visitedFunctions: String[*];
   projectsByDependency : Map[1];
}

Class meta::external::language::java::metamodel::project::Project
{
   root             : ProjectDirectory[1];
   id               : MavenReference[1];
   mainDependencies : Dependency[*];
}

Class meta::external::language::java::metamodel::project::ProjectDirectory
{
   name           : String[1];
   classes        : meta::external::language::java::metamodel::Class[*];
   files          : File[*];

   // Deliberately not using association
   parent         : ProjectDirectory[0..1];
   subdirectories : ProjectDirectory[*];

   fullPath()
   {
      if($this.parent->isEmpty(),
         | fail('Should not reach root'); '';,
         |
      if($this.parent.parent->isEmpty(),
         | $this.name,
         | $this.parent->toOne().fullPath() + '/' + $this.name
      ));
   }: String[1];
}

Class meta::external::language::java::metamodel::project::File
{
   name: String[1];
}

Class meta::external::language::java::metamodel::project::TextFile extends File
{
   content: String[1];
}

Class meta::external::language::java::metamodel::project::Dependency
{
}

Class meta::external::language::java::metamodel::project::MavenReference extends meta::external::language::java::metamodel::project::Dependency
{
   <> group    : String[1];
   <> artifact : String[1];
   <> version  : String[1];
}

function meta::external::language::java::metamodel::javaKeywords(): String[*]
{
   [
      'abstract'  ,'continue'   ,'for'         ,'new'        ,'switch',
      'assert'    ,'default'    ,'if'          ,'package'    ,'synchronized',
      'boolean'   ,'do'         ,'goto'        ,'private'    ,'this',
      'break'     ,'double'     ,'implements'  ,'protected'  ,'throw',
      'byte'      ,'else'       ,'import'      ,'public'     ,'throws',
      'case'      ,'enum'       ,'instanceof'  ,'return'     ,'transient',
      'catch'     ,'extends'    ,'int'         ,'short'      ,'try',
      'char'      ,'final'      ,'interface'   ,'static'     ,'void',
      'class'     ,'finally'    ,'long'        ,'strictfp'   ,'volatile',
      'const'     ,'float'      ,'native'      ,'super'      ,'while'
   ];
}

function meta::external::language::java::metamodel::modelPropertyKeywords(): String[*]
{
   ['com', 'org'];
}

function meta::external::language::java::metamodel::reservedKeywords(): String[*]
{
  javaKeywords()->concatenate(modelPropertyKeywords());
}

function meta::external::language::java::metamodel::isJavaLang(pkg: meta::external::language::java::metamodel::Package[1]):Boolean[1]
{
   $pkg.name == 'lang'
   && $pkg.parent->isNotEmpty()
   && $pkg.parent.name == 'java'
   && $pkg.parent.parent->isEmpty();
}

function meta::external::language::java::metamodel::isStatic(method: meta::external::language::java::metamodel::Method[1]):Boolean[1]
{
   $method.modifiers->contains(meta::external::language::java::metamodel::Modifier.Static);
}

function meta::external::language::java::metamodel::packageNames(pkg: meta::external::language::java::metamodel::Package[1]):String[*]
{
   $pkg.parent->map(p| $p->packageNames())->concatenate($pkg.name);
}

function meta::external::language::java::metamodel::isValidPackageName(name: String[1]): Boolean[1]
{
   // TODO Enable once matches is fully available
   $name->split('.')->forAll(nm | /*$nm->matches('[_$a-zA-Z][_$a-zA-Z0-9]*') && */ !$nm->in(javaKeywords()));
}

function meta::external::language::java::metamodel::isInPackage(type: meta::external::language::java::metamodel::Type[1], packageName: String[1]):Boolean[1]
{
   $type->match([
      p:meta::external::language::java::metamodel::PrimitiveType[1]     | false,
      a:meta::external::language::java::metamodel::Array[1]             | $a.rawType->isInPackage($packageName),
      p:meta::external::language::java::metamodel::ParameterizedType[1] | $p.rawType->isInPackage($packageName),
      t:meta::external::language::java::metamodel::TypeVariable[1]      | false,
      c:meta::external::language::java::metamodel::Class[1]             | $c.package->isPackage($packageName)
   ]);
}

function meta::external::language::java::metamodel::isPackage(pkg: meta::external::language::java::metamodel::Package[1], packageName: String[1]):Boolean[1]
{
   let pos  = $packageName->lastIndexOf('.');
   if($pos == -1,
      | $pkg.name == $packageName && $pkg.parent->isEmpty(),
      {|
         let parent = $packageName->substring(0, $pos);
         let name   = $packageName->substring($pos+1);
         $pkg.name == $name && $pkg.parent->isNotEmpty() && $pkg.parent->toOne()->isPackage($parent);
      }
   );
}

function meta::external::language::java::metamodel::isPrimitiveOrBoxedType(type: meta::external::language::java::metamodel::Type[1]):Boolean[1]
{
   $type->toOne()->match([
      pt: meta::external::language::java::metamodel::PrimitiveType[1] | true,
      c : meta::external::language::java::metamodel::Class[1]         | isBoxedType($c),
      a : Any[1]                                  | false
   ]);
}

function meta::external::language::java::metamodel::isPrimitive(type: meta::external::language::java::metamodel::Type[1]):Boolean[1]
{
   $type->toOne()->match([
      pt: meta::external::language::java::metamodel::PrimitiveType[1] | true,
      a : Any[1]                                  | false
   ]);
}

function meta::external::language::java::metamodel::isPrimitiveNumber(type: meta::external::language::java::metamodel::Type[1]):Boolean[1]
{
   $type->isPrimitive() && $type->cast(@meta::external::language::java::metamodel::PrimitiveType).simpleName->in(['int', 'long', 'short', 'byte', 'float', 'double']);
}

function meta::external::language::java::metamodel::isPrimitiveInt(type: meta::external::language::java::metamodel::Type[1]):Boolean[1]
{
   $type->isPrimitive() && $type->cast(@meta::external::language::java::metamodel::PrimitiveType).simpleName == 'int';
}

function meta::external::language::java::metamodel::isPrimitiveLong(type: meta::external::language::java::metamodel::Type[1]):Boolean[1]
{
   $type->isPrimitive() && $type->cast(@meta::external::language::java::metamodel::PrimitiveType).simpleName == 'long';
}

function meta::external::language::java::metamodel::isBoxedType(type: meta::external::language::java::metamodel::Type[1]):Boolean[1]
{
   $type->instanceOf(meta::external::language::java::metamodel::Class) && $type->cast(@meta::external::language::java::metamodel::Class)->isBoxedType();
}

function meta::external::language::java::metamodel::isBoxedType(class: meta::external::language::java::metamodel::Class[1]):Boolean[1]
{
   $class.simpleName->in(['Boolean', 'Byte', 'Character', 'Float', 'Integer', 'Long', 'Short', 'Double'])
      && $class.package.name == 'lang'
      && $class.package.parent->isNotEmpty()
      && $class.package.parent.name == 'java'
      && $class.package.parent.parent->isEmpty();
}

function meta::external::language::java::metamodel::isBoxedNumberType(type: meta::external::language::java::metamodel::Type[1]):Boolean[1]
{
   $type->instanceOf(meta::external::language::java::metamodel::Class) && $type->cast(@meta::external::language::java::metamodel::Class)->isBoxedNumberType();
}

function meta::external::language::java::metamodel::isBoxedNumberType(class: meta::external::language::java::metamodel::Class[1]):Boolean[1]
{
   $class.simpleName->in(['Byte', 'Float', 'Integer', 'Long', 'Short', 'Double', 'Number']) && $class.package ->isJavaLang();
}

function meta::external::language::java::metamodel::isClass(type:meta::external::language::java::metamodel::Type[1], qualifiedName:String[1]):Boolean[1]
{
   $type->match([
      c:meta::external::language::java::metamodel::Class[1] | $c->isClass($qualifiedName),
      a:Any[1]                                              | false
   ]);
}

function meta::external::language::java::metamodel::isClass(type:meta::external::language::java::metamodel::Type[1], pkg:String[1], names:String[*]):Boolean[1]
{
   $type->match([
      c:meta::external::language::java::metamodel::Class[1] | $c->isClass($pkg, $names),
      a:Any[1]                                              | false
   ]);
}

function meta::external::language::java::metamodel::isClass(c:meta::external::language::java::metamodel::Class[1], qualifiedName:String[1]):Boolean[1]
{
   let pos  = $qualifiedName->lastIndexOf('.');
   let pkg  = $qualifiedName->substring(0, $pos);
   let name = $qualifiedName->substring($pos+1);
   $c->isClass($pkg, $name);
}

function meta::external::language::java::metamodel::isClass(c:meta::external::language::java::metamodel::Class[1], pkg:String[1], names:String[*]):Boolean[1]
{
   $c->isInPackage($pkg) && $c.simpleName->in($names);
}

function meta::external::language::java::metamodel::isSubclassOf(c1:meta::external::language::java::metamodel::Class[1], c2:meta::external::language::java::metamodel::Class[1]):Boolean[1]
{
   if($c1 == $c2 || $c2->isClass('java.lang.Object'),
      | true,
      |
   if($c1.superType->isNotEmpty(),
      | $c1.superType->cast(@meta::external::language::java::metamodel::Class)->toOne()->isSubclassOf($c2),
      |
   if($c1->isClass('java.lang', 'Byte'),
      | $c2->isClass('java.lang', ['Short', 'Character', 'Integer', 'Long', 'Float', 'Double', 'Number']),
      |
   if($c1->isClass('java.lang', 'Short'),
      | $c2->isClass('java.lang', ['Character', 'Integer', 'Long', 'Float', 'Double', 'Number']),
      |
   if($c1->isClass('java.lang', 'Character'),
      | $c2->isClass('java.lang', ['Integer', 'Long', 'Float', 'Double', 'Number']),
      |
   if($c1->isClass('java.lang', 'Integer'),
      | $c2->isClass('java.lang', ['Long', 'Float', 'Double', 'Number']),
      |
   if($c1->isClass('java.lang', 'Long'),
      | $c2->isClass('java.lang', ['Float', 'Double', 'Number']),
      |
   if($c1->isClass('java.lang', 'Float'),
      | $c2->isClass('java.lang', ['Double', 'Number']),
      |
   if($c1->isClass('java.lang', 'Double'),
      | $c2->isClass('java.lang', 'Number'),
      | false
   )))))))));
}

function meta::external::language::java::metamodel::isStatement(code: Code[1]):Boolean[1]
{
   $code->match([
      c:SimpleCode[1] | true,   // Since unkmown we rely on caller to ensure it's in the right form
      c:Statement[1]  | true,
      c:Code[1]       | false
   ]);
}

function meta::external::language::java::metamodel::isNull(expression:Code[1]):Boolean[1]
{
   $expression->instanceOf(Null);
}


function meta::external::language::java::metamodel::isSameLiteral(left:Code[1], right:Code[1]):Boolean[1]
{
   $left->instanceOf(Literal) && $right->instanceOf(Literal)
      && $left->cast(@Literal).type == $right->cast(@Literal).type
      && $left->cast(@Literal).literal == $right->cast(@Literal).literal;
}


function meta::external::language::java::metamodel::isValidExpressionAsStatement(expression:Code[1]):Boolean[1]
{
   $expression->match([
      pre : PrefixExpression[1]  | $pre.op->in(['++', '--']),
      post: PostfixExpression[1] | $post.op->in(['++', '--']),
      inf : InfixExpression[1]   | $inf.op->in(assignmentOperators()),
      mc  : MethodCall[1]        | true,
      smc : StaticMethodCall[1]  | true,
      new : New[1]               | true,
      c   : Code[1]              | false
   ])
}

function meta::external::language::java::metamodel::isAssignment(c:Code[1]):Boolean[1]
{
   $c->match([
      inf : InfixExpression[1] | $inf.op->in(assignmentOperators()),
      c   : Code[1]            | false
   ])
}

function meta::external::language::java::metamodel::isDeclaration(c:Code[1]):Boolean[1]
{
   $c->match([
      lvd : LocalVariableDeclaration[1] | true,
      c   : Code[1]                     | false
   ]);
}

function meta::external::language::java::metamodel::isDeclarationWithAssignment(c:Code[1]):Boolean[1]
{
   $c->match([
      lvd : LocalVariableDeclaration[1] | !$lvd.initializer->isEmpty(),
      c   : Code[1]                     | false
   ]);
}

function meta::external::language::java::metamodel::isCollectionsEmptyList(c:Code[1]):Boolean[1]
{
   $c->match([
      smc:StaticMethodCall[1] | $smc.class->isClass('java.util.Collections') && $smc.methodName == 'emptyList',
      c  :Code[1]             | false
   ]);
}

function meta::external::language::java::metamodel::isDeprecated(c:Code[1]):Boolean[1]
{
   $c->instanceOf(SimpleCode);
}

function meta::external::language::java::metamodel::isParameter(c:Code[1]):Boolean[1]
{
   $c->instanceOf(Parameter);
}

function meta::external::language::java::metamodel::parameterName(c:Code[1]):String[1]
{
   $c->cast(@Parameter).name;
}

function meta::external::language::java::metamodel::isVariable(c:Code[1]):Boolean[1]
{
   $c->instanceOf(Variable);
}

function meta::external::language::java::metamodel::variableName(c:Code[1]):String[1]
{
   $c->cast(@Variable).name;
}

function meta::external::language::java::metamodel::isNil(i:ValueSpecification[1]) : Boolean[1]
{
  $i->cast(@ValueSpecification).genericType.rawType == Nil;
}

function meta::external::language::java::metamodel::isJavaArray(type: meta::external::language::java::metamodel::Type[1]):Boolean[1]
{
   $type->instanceOf(meta::external::language::java::metamodel::Array);
}

function meta::external::language::java::metamodel::isJavaPrimitive(type: meta::external::language::java::metamodel::Type[1]):Boolean[1]
{
   $type->instanceOf(meta::external::language::java::metamodel::PrimitiveType);
}

function meta::external::language::java::metamodel::isJavaParameterizedTyype(type: meta::external::language::java::metamodel::Type[1]):Boolean[1]
{
   $type->instanceOf(meta::external::language::java::metamodel::ParameterizedType);
}

function meta::external::language::java::metamodel::isJavaList(type: meta::external::language::java::metamodel::Type[1]):Boolean[1]
{
   $type->match([
      pt: meta::external::language::java::metamodel::ParameterizedType[1] | $pt.rawType->isClass('java.util.List'),
      a :Any[1]                                                           | false
   ]);
}

function meta::external::language::java::metamodel::isJavaCollection(type: meta::external::language::java::metamodel::Type[1]):Boolean[1]
{
   $type->match([
      pt: meta::external::language::java::metamodel::ParameterizedType[1] | $pt.rawType->isClass('java.util', ['List', 'Set', 'EnumSet', 'ArrayList', 'LinkedList', 'HashSet', 'TreeSet']),
      a :Any[1]                                                           | false
   ]);
}

function meta::external::language::java::metamodel::elementType(type: meta::external::language::java::metamodel::Type[1]):meta::external::language::java::metamodel::Type[1]
{
   assert($type->isJavaParameterizedTyype(), |'Cannot obtain element type as not a Parameterized Type');
   $type->cast(@meta::external::language::java::metamodel::ParameterizedType).typeArguments->at(0);
}

function meta::external::language::java::metamodel::elementTypeOfJavaList(type: meta::external::language::java::metamodel::Type[1]):meta::external::language::java::metamodel::Type[1]
{
   assert($type->isJavaList(), |'Cannot obtain element type as not a List');
   $type->elementType();
}

function meta::external::language::java::metamodel::isJavaSupplier(type: meta::external::language::java::metamodel::Type[1]):Boolean[1]
{
   $type->match([
      pt: meta::external::language::java::metamodel::ParameterizedType[1] | $pt.rawType->isClass('java.util.function.Supplier'),
      a :Any[1]                                                           | false
   ]);
}

function meta::external::language::java::metamodel::isJavaFunction(type: meta::external::language::java::metamodel::Type[1]):Boolean[1]
{
   $type->match([
      pt: meta::external::language::java::metamodel::ParameterizedType[1] | $pt.rawType->isClass('java.util.function.Function'),
      a :Any[1]                                                           | false
   ]);
}

function meta::external::language::java::metamodel::suppliedTypeOfJavaSupplier(type: meta::external::language::java::metamodel::Type[1]):meta::external::language::java::metamodel::Type[1]
{
   assert($type->isJavaSupplier(), |'Cannot obtain supplied type as not a Supplier');
   $type->cast(@meta::external::language::java::metamodel::ParameterizedType).typeArguments->at(0);
}

function meta::external::language::java::metamodel::returnTypeOfJavaFunction(type: meta::external::language::java::metamodel::Type[1]):meta::external::language::java::metamodel::Type[1]
{
   assert($type->isJavaFunction(), |'Cannot obtain supplied type as not a Function');
   $type->cast(@meta::external::language::java::metamodel::ParameterizedType).typeArguments->at(1);
}

function meta::external::language::java::metamodel::inputTypeOfJavaFunction(type: meta::external::language::java::metamodel::Type[1]):meta::external::language::java::metamodel::Type[1]
{
   assert($type->isJavaFunction(), |'Cannot obtain supplied type as not a Function');
   $type->cast(@meta::external::language::java::metamodel::ParameterizedType).typeArguments->at(0);
}

function meta::external::language::java::metamodel::isJavaStream(type: meta::external::language::java::metamodel::Type[1]):Boolean[1]
{
   $type->match([
      pt: meta::external::language::java::metamodel::ParameterizedType[1] | $pt.rawType->isClass('java.util.stream.Stream'),
      a :Any[1]                                                           | false
   ]);
}

function meta::external::language::java::metamodel::elementTypeOfJavaStream(type: meta::external::language::java::metamodel::Type[1]):meta::external::language::java::metamodel::Type[1]
{
   assert($type->isJavaStream(), |'Cannot obtain element type as not a Stream');
   $type->elementType();
}

function meta::external::language::java::metamodel::isJavaOptional(type: meta::external::language::java::metamodel::Type[1]):Boolean[1]
{
   $type->match([
      pt: meta::external::language::java::metamodel::ParameterizedType[1] | $pt.rawType->isClass('java.util.Optional'),
      a :Any[1]                                                           | false
   ]);
}

function meta::external::language::java::factory::elementTypeOfJavaOptional(type: meta::external::language::java::metamodel::Type[1]):meta::external::language::java::metamodel::Type[1]
{
   assert($type->isJavaOptional(), |'Cannot obtain element type as not an Optional');
   $type->elementType();
}


function meta::external::language::java::metamodel::project::containsClass(project:Project[1], class:meta::external::language::java::metamodel::Class[1]): Boolean[1]
{
   $project->getClass($class)->isNotEmpty();
}

function meta::external::language::java::metamodel::project::containsClass(project:Project[1], fullClassName:String[1]): Boolean[1]
{
   $project->containsClass('src/main/java', $fullClassName);
}

function meta::external::language::java::metamodel::project::containsClass(project:Project[1], path:String[1], fullClassName:String[1]): Boolean[1]
{
   $project->getClass($path, $fullClassName)->isNotEmpty();
}

function meta::external::language::java::metamodel::project::resolve(project: Project[1], class:meta::external::language::java::metamodel::Class[1]): meta::external::language::java::metamodel::Class[1]
{
   let resolved = $project->getClass($class);
   if($resolved->isEmpty(), |$class, |$resolved->toOne());
}

function meta::external::language::java::metamodel::project::getClass(project: Project[1], class:meta::external::language::java::metamodel::Class[1]): meta::external::language::java::metamodel::Class[0..1]
{
   $project->getClass('src/main/java', $class.package->packageNames(), $class.simpleName);
}

function meta::external::language::java::metamodel::project::getClass(project: Project[1], path:String[1], className: String[1]): meta::external::language::java::metamodel::Class[0..1]
{
   let dotPos    = $className->lastIndexOf('.');
   let clsName   = $className->substring($dotPos+1);
   let pkgNames  = $className->substring(0, $dotPos)->split('.');
   $project->getClass($path, $pkgNames, $clsName);
}

function meta::external::language::java::metamodel::project::getClass(project: Project[1], path:String[1], pkgNames: String[*], clsName: String[1]): meta::external::language::java::metamodel::Class[0..1]
{
   let pathNames = $path->split('/');
   let baseDir   = $pathNames->fold({name:String[1],d:ProjectDirectory[*]| if($d->isEmpty(), |[], |$d.subdirectories->filter(sd|$sd.name == $name))}, $project.root);
   let dir       = $pkgNames->fold({name:String[1],d:ProjectDirectory[*]| if($d->isEmpty(), |[], |$d.subdirectories->filter(sd|$sd.name == $name))}, $baseDir);
   let classes   = $dir->map(d|$d.classes->filter(c|$c.simpleName == $clsName));

   assert($classes->size() < 2, |'Unexpectedly found duplicate class ' + $clsName);
   $classes->first();
}

function meta::external::language::java::metamodel::project::allClasses(project: Project[1]): meta::external::language::java::metamodel::Class[*]
{
   $project->allDirectories().classes;
}

function meta::external::language::java::metamodel::project::allDirectories(project: Project[1]): ProjectDirectory[*]
{
   $project.root->allSubDirectories();
}

function meta::external::language::java::metamodel::project::allSubDirectories(dir: ProjectDirectory[1]): ProjectDirectory[*]
{
   $dir.subdirectories->fold({d, acc|$acc->concatenate($d)->concatenate($d->allSubDirectories())}, []);
}





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