xtext中的跨文件引用和链接

时间：2015-12-07 01:47:44

标签： dsl xtext emf cross-reference

我使用xtext创建了一个新的DSL，如下所示。 （实际上我将在RCP应用程序上访问DSL。）

grammar org.xtext.example.mydsl.MyDsl with      org.eclipse.xtext.common.Terminals

generate myDsl "http://www.xtext.org/example/mydsl/MyDsl"


Configuration:
components+=(Component)*;

Component:
'Component' name=ID
'{'
(('display' display=STRING) &
('dependency' dependency=[Component|ID])?)
'}'
 ;

我有两个文件：sample1.mydsl 

 Component comp1 {
     display "comp1"
     children comp2
 }

sampl2.mydsl 

 Component comp2 {
      display "comp2"
 }

在RCP应用程序中，我将使用Configuration模型编写树视图。但是当我从comp1对象的getChildren（）方法获取comp2对象时，有时候我无法准确地获得comp2对象。

  1. 我按如下方式加载了模型数据：

        private List<ConfigurationItem> itemList;

    void loadData() {
    project =               ResourcesPlugin.getWorkspace().getRoot().getProject("test");

    XtextResourceSet resourceSet = (XtextResourceSet) injector
        .getInstance(XtextResourceSetProvider.class)
        .get(project);
    resourceSet.addLoadOption(XtextResource.OPTION_RESOLVE_ALL, Boolean.TRUE);

    IFile[] samples = findFiles(resources);

    List<Resource> resourceList = new ArrayList<Resource>();
    for (IFile sample : samples) {
        Resource resourceSample = resourceSet.getResource(
                URI.createURI(sample.getLocationURI().toString(), true), true);
        resourceList.add(resourceSample);
    }

    for (Resource resource : resourceList) {
        System.out.println("resource = " + resource.toString());
        try {
            resource.load(null);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        EcoreUtil.resolveAll(resource);
    }

    // add all to configuration item list
    for (Resource rc : resourceList) {
        Configuration config = (Configuration) rc.getContents().get(0);
        itemList.addAll(config.getConfigurationItems().toArray(new ConfigurationItem[config.getConfigurationItems().size()]));
    }

    }

  2. 测试代码

    for (ConfigurationItem item : itemList) {
   if (item.getName().equals("comp1") {
      Component[] comps = item.getChildren();
      for (Component comp : comps) {
         if (comp != null) {
             System.out.println("comp display : " + comp.getDisplay());
         }
      }
  }

    }

  3. 结果

    comp display : null

    4. 我希望结果是＆＃34; comp display：comp2＆＃34;。

    但有时结果是＆＃34; comp显示：comp2＆＃34;

    有时结果是＆＃34; comp display：null＆＃34;

    我认为这是因为xtext的延迟链接。

    我怎样才能得到正确的结果 - ＆gt; ＆＃34; comp显示：comp2＆＃34;？

    我希望有人可以帮我解决。感谢。

3 个答案:

答案 0 :(得分：0)

您可以尝试以下代码：

  void loadData() {
    project =               ResourcesPlugin.getWorkspace().getRoot().getProject("test");
    ResourceSet resourceSet = new ResourceSetImpl();
IFile[] samples = findFiles(project);
List<Resource> resourceList = new ArrayList<Resource>();
for (IFile sample : samples) {
    Resource resourceSample = resourceSet.getResource(
            URI.createURI(sample.getFullPath().toString()), true);
    resourceList.add(resourceSample);
}


// add all to configuration item list
for (Resource rc : resourceList) {
    Configuration config = (Configuration) rc.getContents().get(0);
    itemList.addAll(config.getConfigurationItems()));
}
}

答案 1 :(得分：0)

我制作了一份分析样本。 请查看以下内容。

  1. 以下代码是我的示例测试代码。我打电话 new SampleConfigLoadOperation3（）。run（monitor）;在我的RCP申请表上。

    2. SampleConfigLoadOperation3.java 

    import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.InvocationTargetException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IFolder;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IWorkspace;
import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.ecore.resource.impl.ResourceSetImpl;
import org.eclipse.jface.operation.IRunnableWithProgress;

import com.mdstec.ide.kcdsl.ConfigDSL.ConfigurationItem;
import com.mdstec.ide.kcdsl.ConfigDSL.Configuration;


public class SampleConfigLoadOperation3 implements IRunnableWithProgress {

// Progress message
final String loadConfigTaskBeginMsg = "load configuration.";

IProject project;

DataListener dataListener;

/**
 * Constructor for project configuration object
 * 
 * @param prjConfig
 *            the project configuration object
 */
public SampleConfigLoadOperation3() {
    // TODO Auto-generated constructor stub
}


public SampleConfigLoadOperation3(IProject project, DataListener listner) {
    // TODO Auto-generated constructor stub
    this.project = project;
    this.dataListener = listner;

}
@Override
public void run(IProgressMonitor monitor) throws InvocationTargetException,
        InterruptedException {
    // TODO Auto-generated method stub
    if (monitor != null) {
        monitor.beginTask(loadConfigTaskBeginMsg, IProgressMonitor.UNKNOWN);
    }

    try {
        loadConfigData(monitor);
    } catch (Exception e) {
        throw new InvocationTargetException(e, "Loading error" + ": "
                + e.getMessage());
    } finally {
        if (monitor != null) {
            monitor.done();
        }
    }

    if (monitor != null) {
        if (monitor.isCanceled()) {
            throw new InterruptedException("Cancel loading");
        }
    }

}

private void loadConfigData(IProgressMonitor monitor) {
    IWorkspace workspace = ResourcesPlugin.getWorkspace();
    IWorkspaceRoot workspaceRoot = workspace.getRoot();
    project  = workspaceRoot.getProject("testproject");
    IFolder sampleFolder = project.getFolder("data");
    //at this point, no resources have been created
    try {
        if (!project.exists())
            project.create(null);
        if (!project.isOpen()) 
            project.open(null);
    } catch (CoreException e2) {
        // TODO Auto-generated catch block
        e2.printStackTrace();
    }

    if (!sampleFolder.exists()) {
        try {
            sampleFolder.create(IResource.NONE, true, null);
        } catch (CoreException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    copyDataFileToProject("sample1.cdl", "data");
    copyDataFileToProject("sample2.cdl", "data");


    ResourceSet resourceSet = new ResourceSetImpl();

    IResource[] resources = null;
    try {
        resources = sampleFolder.members();
    } catch (CoreException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    }
    if (resources != null) {
        IFile[] samples = findFiles(resources);
        List<Resource> resourceList = new ArrayList<Resource>();
        for (IFile sample : samples) {
            Resource resourceSample = resourceSet.getResource(
                    URI.createURI(sample.getFullPath().toString()), true);

            resourceList.add(resourceSample);
        }

        // add all to configuration item list
        List<ConfigurationItem> configItemList = new ArrayList<ConfigurationItem>();
        for (Resource rc : resourceList) {
            Configuration config = (Configuration) rc
                    .getContents().get(0);
            configItemList.addAll(config.getConfigurationItems());
        }

        // root model
        List<ConfigurationItem> rootItemList = new ArrayList<ConfigurationItem>();
        // set root list in configuration item list
        for (int i = 0; i < configItemList.size(); i++) {
            ConfigurationItem item = configItemList.get(i);
            if (item instanceof com.mdstec.ide.kcdsl.ConfigDSL.Package) {
                if (((com.mdstec.ide.kcdsl.ConfigDSL.Package) item)
                        .isIsRoot()) {
                    rootItemList.add(item);
                }
            }
        }

        // set parents
        for (int i = 0; i < rootItemList.size(); i++) {
            ConfigurationItem root = rootItemList.get(i);
            ConfigurationItem[] children = (ConfigurationItem[]) root
                    .getChildren().toArray();
            setParent(children, root);

        }

        System.out.println("root size = " + rootItemList.size());
        for (ConfigurationItem item : rootItemList) {
            findChildren(item);
        }


    }
}

private void copyDataFileToProject(String fileName, String prjDir) {
    // TODO Auto-generated method stub
    File file = new File("C:/test/data/" + fileName);
    URL sourceURL = null;
    try {
        sourceURL = file.toURL(); // using .toURI().toURL()
                                    // fails,
                                    // due to
                                    // spaces substitution

    } catch (MalformedURLException e) {
        e.printStackTrace();
    }
    InputStream in = null;
    try {
        in = sourceURL.openStream();
    } catch (IOException e) {
        e.printStackTrace();
    }
    IFile iFile = project.getFile(prjDir + "/" + fileName);
    if (!iFile.exists()) {
        try {
            iFile.create(in, true, null);
            iFile.refreshLocal(IResource.DEPTH_ONE, null);
        } catch (CoreException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}

private void findChildren(ConfigurationItem item) {
    // TODO Auto-generated method stub

    ConfigurationItem[] children = (ConfigurationItem[]) item.getChildren()
            .toArray();
    if (children != null && children.length > 0) {
        for (ConfigurationItem child : children) {
            System.out.println("child name of " + item.getName() + " : "
                    + child.getName());
            findChildren(child);
        }
    }
}

private void setParent(ConfigurationItem[] children,
        ConfigurationItem parent) {
    // TODO Auto-generated method stub
    if (children != null && children.length > 0) {
        for (ConfigurationItem child : children) {
            child.setParent(parent);
            setParent((ConfigurationItem[]) child.getChildren().toArray(),
                    child);
        }
    }
}

private IFile[] findFiles(IResource[] resources) {
    List<IFile> fileList = new ArrayList<IFile>();
    find(resources, fileList);
    return fileList.toArray(new IFile[fileList.size()]);
}

private void find(IResource[] resources, List<IFile> fileList) {
    // TODO Auto-generated method stub

    if (resources != null && resources.length > 0) {
        for (IResource res : resources) {
            if (res instanceof IFile) {
                fileList.add((IFile) res);
            } else if (res instanceof IFolder) {
                IResource[] reses;
                try {
                    reses = ((IFolder) res).members();
                    find(reses, fileList);
                } catch (CoreException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

            }
        }
    }
}

}
    1. 我使用xtext定义了我的DSL，如下所示，并生成了模型和解析器。

      2. ConfigDSL.xtext 

      generate ConfigDSL "............."

Configuration:
    ((configurationItems+=ConfigurationItem)*
;

ConfigurationItem:
    Package | Component
;

Package:
    'Package' name=ID
    '{'
        (('display' display=STRING) &
        ('description' description=STRING)? &
        ('children' children += [ConfigurationItem|ID] (',' children +=         [ConfigurationItem|ID])*)?  &
        ('parent' parent = [ConfigurationItem|ID])? &
        ('isRoot' isRoot=BOOLEAN)?
        )
    '}'
;

Component:
    'Component' name=ID
    '{'
        (('display' display=STRING) &
        ('parent' parent = [ConfigurationItem|ID])?
        )
    '}'
;

terminal BOOLEAN returns ecore::EBoolean
    : 'true' | 'false';
      1. 我创建了两个DSL文件（sample1.cdl，sample2.cdl），如下所示，位于＆＃34; C：/ test / data＆＃34;目录。

        2. sample1.cdl 

        Component ds1 {
    display "ds1"
}

Component ds2 {
    display "ds2"
}


Package pk1 {
    display "pk1"
    children ds1, ds2, ds3
    isRoot true
}

        sample2.cdl 

        Component ds3 {
    display "ds3"
}

        1. 当我调用＆＃34; new SampleConfigLoadOperation3（）。run（monitor）;＆＃34;在我的RCP应用程序中，结果如下。

          root size = 1
child name of pk1 : ds1
child name of pk1 : ds2
child name of pk1 : null

          2. 我不知道为什么第3行的结果是＆＃34; pk1的子名称：null＆＃34;。 我希望结果是＆＃34; pk1的子名：ds3＆＃34;。

答案 2 :(得分：0)

我解决了这个问题。 创建ResourceSet对象时，我修改了如下代码。 现在效果很好。

     Injector injector = new MyDSLStandaloneSetup().createInjectorAndDoEMFRegistration();
     XtextResourceSet resourceSet = injector.getInstance(XtextResourceSet.class);

我理解错误，MyDSLStandaloneSetup（）不应该在RCP中使用。

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