Question

我在工作台Project Explorer中有很多XML文件，每个文件都是十个不同ecore模型之一的实例。对于每个ecore模型，我想向导航器的commonFilter扩展点提供navigatorContent，以使用户能够显示或隐藏相应的XML文件。这些是外部工具文件，因此仅通过观察文件名或xml扩展名无法识别内容，并且重命名不可行。使用从org.eclipse.jface.viewers.ViewerFilter派生的类，可以确定XML文件包含哪些ecore模型的最佳方法是什么？我假设有一种简单的方法可以使用EMF资源，或使用EcoreUtil或使用适配器，但我还没有找到成功的技术。或者，直接从扩展点的filterExpression或观看者的viewerContentBinding执行此操作的方法也没问题。所有genmodel派生的插件都可用于各种ecore模型。

package com.my.navigator;
import org.eclipse.core.resources.IFile;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerFilter;


public class MyViewerFilter extends ViewerFilter {

public MyViewerFilter() {
}

@Override
public boolean select(Viewer viewer, Object parentElement, Object element) {
        if ( element instanceof IFile ) {
            IFile file = (IFile)element;
            // check whether file is one of our ecore models...
            // ...
        }

        return true;
    }

}

Answer 1

您可以使用org.eclipse.core.contenttype.contentTypes为文件定义新的内容类型。

使用内容类型定义的describer参数指定“内容描述符”类，该类可以检查XML文件是否满足您的要求。已有XMLContentDescriber类可用作描述符的基础。

例如，这是Ant build.xml文件的内容类型定义：

<extension 
    point="org.eclipse.core.contenttype.contentTypes"> 
    <content-type  
        id="antBuildFile" 
        name="%antBuildFileContentType.name" 
        base-type="org.eclipse.core.runtime.xml"
        file-names="build.xml"
        file-extensions="macrodef,ent,xml,ant"
        priority="normal"> 
        <describer 
            class="org.eclipse.ant.internal.core.contentDescriber.AntBuildfileContentDescriber">
        </describer> 
    </content-type> 
</extension>

这是Ant内容描述符，可以让您大致了解您的内容：

public final class AntBuildfileContentDescriber extends XMLContentDescriber implements IExecutableExtension {

    private int checkCriteria(InputSource contents) throws IOException {
        AntHandler antHandler = new AntHandler();
        try {
            if (!antHandler.parseContents(contents)) {
                return INDETERMINATE;
            }
        }
        catch (SAXException e) {
            // we may be handed any kind of contents... it is normal we fail to parse
            return INDETERMINATE;
        }
        catch (ParserConfigurationException e) {
            // some bad thing happened - force this describer to be disabled
            String message = "Internal Error: XML parser configuration error during content description for Ant buildfiles"; //$NON-NLS-1$
            throw new RuntimeException(message);
        }
        // Check to see if we matched our criteria.
        if (antHandler.hasRootProjectElement()) {
            if (antHandler.hasProjectDefaultAttribute() || antHandler.hasTargetElement() || antHandler.hasAntElement()) {
                // project and default attribute or project and target element(s)
                // or project and top level ant element(s) (classpath, import, macrodef, path, property, taskdef, typedef)
                return VALID;
            }
            // only a top level project element...maybe an Ant buildfile
            return INDETERMINATE;
        }

        return INDETERMINATE;
    }

    @Override
    public int describe(InputStream contents, IContentDescription description) throws IOException {
        // call the basic XML describer to do basic recognition
        if (super.describe(contents, description) == INVALID) {
            return INVALID;
        }
        // super.describe will have consumed some chars, need to rewind
        contents.reset();
        // Check to see if we matched our criteria.
        return checkCriteria(new InputSource(contents));
    }

    @Override
    public int describe(Reader contents, IContentDescription description) throws IOException {
        // call the basic XML describer to do basic recognition
        if (super.describe(contents, description) == INVALID) {
            return INVALID;
        }
        // super.describe will have consumed some chars, need to rewind
        contents.reset();
        // Check to see if we matched our criteria.
        return checkCriteria(new InputSource(contents));
    }

    @Override
    public void setInitializationData(IConfigurationElement config, String propertyName, Object data) throws CoreException {
        // do nothing
    }
}

用于XML文件的Eclipse Project Explorer过滤器

1 个答案: