CODEWITHSUNDEEP
xtext
Jonathan
Jonathan

Reputation: 2855

Using Inject in an Xtend based Xtext code generator

I am brand new to Xtext and Xtend and am trying to learn Xtext using the Xtext tutorials in the Xtext documentation. I am running on Eclipse Photon under Java 10 with Xtext 2.14. I am starting the extended tutorial and have a problem very early on. Here is the code for my attempt at a code generator:

/*
 * generated by Xtext 2.14.0
 */
package net.wiseoldbird.tutorial.domainmodel.generator

import org.eclipse.emf.ecore.resource.Resource
import org.eclipse.xtext.generator.AbstractGenerator
import org.eclipse.xtext.generator.IFileSystemAccess2
import org.eclipse.xtext.generator.IGeneratorContext
import net.wiseoldbird.tutorial.domainmodel.domainmodel.Entity
import com.google.inject.Inject

@Inject extension IQualifiedNameProvider;

class DomainmodelGenerator extends AbstractGenerator {

    override void doGenerate(Resource resource, IFileSystemAccess2 fsa, IGeneratorContext context) {
        for (e: resource.allContents.toIterable.filter(Entity)) {
        fsa.generateFile(e.fullyQualifiedName.toString("/") + ".java", e.compile)

        }
    }
}

Here is my grammar file:

grammar net.wiseoldbird.tutorial.domainmodel.Domainmodel
        with org.eclipse.xtext.common.Terminals

generate domainmodel "http://www.wiseoldbird.net/tutorial/domainmodel/Domainmodel"

Domainmodel :
    (elements+=AbstractElement)*;

PackageDeclaration:
    'package' name=QualifiedName '{'
        (elements+=AbstractElement)*
    '}';

AbstractElement:
    PackageDeclaration | Type | Import;

QualifiedName:
    ID ('.' ID)*;

Import:
    'import' importedNamespace=QualifiedNameWithWildcard;

QualifiedNameWithWildcard:
    QualifiedName '.*'?;

Type:
    DataType | Entity;

DataType:
    'datatype' name=ID;

Entity:
    'entity' name=ID ('extends' superType=[Entity|QualifiedName])? '{'
        (features+=Feature)*
    '}';

Feature:
    (many?='many')? name=ID ':' type=[Type|QualifiedName];

My problem is that Eclipse says there is a problem with the @Inject annotation. It says that Inject cannot be resolved to an annotation type. This is in an Eclipse Xtext project generated from the instructions in the tutorial.

How do I proceed from here?

Upvotes: 0

Views: 868

Answers (1)

Christian Dietrich
Christian Dietrich

Reputation: 11868

you can inject only fields and post-init-method/constructor parameters

import com.google.inject.Inject
import org.eclipse.emf.ecore.resource.Resource
import org.eclipse.xtext.example.domainmodel.domainmodel.Entity
import org.eclipse.xtext.generator.AbstractGenerator
import org.eclipse.xtext.generator.IFileSystemAccess2
import org.eclipse.xtext.generator.IGeneratorContext
import org.eclipse.xtext.naming.IQualifiedNameProvider

class DomainmodelGenerator extends AbstractGenerator {

    @Inject extension IQualifiedNameProvider

    override void doGenerate(Resource resource, IFileSystemAccess2 fsa, IGeneratorContext context) {
        for (e : resource.allContents.toIterable.filter(Entity)) {
            fsa.generateFile(e.fullyQualifiedName.toString("/") + ".java", e.compile)

        }
    }

    def compile(Entity e) '''
        package «e.eContainer.fullyQualifiedName»;

        public class «e.name» {
        }
    '''
}

Upvotes: 1

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