import com.intellij.xml.XmlSchemaProvider; //导入依赖的package包/类
private boolean isDevKitConfig(XmlTag tag, XmlFile baseFile) {
    Module module = ModuleUtilCore.findModuleForPsiElement(baseFile);

    String namespace = tag.getNamespace();
    List<XmlSchemaProvider> providers = XmlSchemaProvider.getAvailableProviders(baseFile);

    for (XmlSchemaProvider provider : providers) {
        Set<String> locations = provider.getLocations(namespace, baseFile);
        for (String location : locations) {
            XmlFile schema = provider.getSchema(location, module, baseFile);
            if (schema != null) {
                String schemaFile = schema.getText();
                if (schemaFile.contains("http://www.mulesoft.org/schema/mule/devkit")) {
                    return true;
                }
            }
        }
    }

    return false;
}
 

import com.intellij.xml.XmlSchemaProvider; //导入依赖的package包/类
@Nullable
public static String suggestPrefix(XmlFile file, @Nullable String namespace)
{
	if(namespace == null)
	{
		return null;
	}
	for(XmlSchemaProvider provider : XmlSchemaProvider.getAvailableProviders(file))
	{
		String prefix = provider.getDefaultPrefix(namespace, file);
		if(prefix != null)
		{
			return prefix;
		}
	}
	return null;
}
 

import com.intellij.xml.XmlSchemaProvider; //导入依赖的package包/类
@Nullable
public static String suggestPrefix(XmlFile file, @Nullable String namespace) {
    if (namespace == null) {
        return null;
    }
    for (XmlSchemaProvider provider : XmlSchemaProvider.getAvailableProviders(file)) {
        String prefix = provider.getDefaultPrefix(namespace, file);
        if (prefix != null) {
            return prefix;
        }
    }
    return null;
}
 

import com.intellij.xml.XmlSchemaProvider; //导入依赖的package包/类
@Override
protected void setUp() throws Exception {
  super.setUp();

  final LocalInspectionTool[] tools = configureLocalInspectionTools();

  CodeInsightTestFixtureImpl.configureInspections(tools, getProject(), Collections.<String>emptyList(),
                                                  getTestRootDisposable());

  DaemonCodeAnalyzerImpl daemonCodeAnalyzer = (DaemonCodeAnalyzerImpl)DaemonCodeAnalyzer.getInstance(getProject());
  daemonCodeAnalyzer.prepareForTest();
  final StartupManagerImpl startupManager = (StartupManagerImpl)StartupManagerEx.getInstanceEx(getProject());
  startupManager.runStartupActivities();
  startupManager.startCacheUpdate();
  startupManager.runPostStartupActivities();
  DaemonCodeAnalyzerSettings.getInstance().setImportHintEnabled(false);

  if (isPerformanceTest()) {
    IntentionManager.getInstance().getAvailableIntentionActions();  // hack to avoid slowdowns in PyExtensionFactory
    PathManagerEx.getTestDataPath(); // to cache stuff
    ReferenceProvidersRegistry.getInstance(); // pre-load tons of classes
    InjectedLanguageManager.getInstance(getProject()); // zillion of Dom Sem classes
    LanguageAnnotators.INSTANCE.allForLanguage(JavaLanguage.INSTANCE); // pile of annotator classes loads
    LanguageAnnotators.INSTANCE.allForLanguage(StdLanguages.XML);
    ProblemHighlightFilter.EP_NAME.getExtensions();
    Extensions.getExtensions(ImplicitUsageProvider.EP_NAME);
    Extensions.getExtensions(XmlSchemaProvider.EP_NAME);
    Extensions.getExtensions(XmlFileNSInfoProvider.EP_NAME);
    Extensions.getExtensions(ExternalAnnotatorsFilter.EXTENSION_POINT_NAME);
    Extensions.getExtensions(IndexPatternBuilder.EP_NAME);
  }
}
 

import com.intellij.xml.XmlSchemaProvider; //导入依赖的package包/类
@Override
@Nullable
public PsiFile getResourceLocation(@NotNull @NonNls final String url, @NotNull final PsiFile baseFile, final String version) {
  final XmlFile schema = XmlSchemaProvider.findSchema(url, baseFile);
  if (schema != null) {
    return schema;
  }
  final String location = getResourceLocation(url, version, baseFile.getProject());
  return XmlUtil.findXmlFile(baseFile, location);
}
 

import com.intellij.xml.XmlSchemaProvider; //导入依赖的package包/类
@Nullable
public static String suggestPrefix(XmlFile file, @Nullable String namespace) {
  if (namespace == null) {
    return null;
  }
  for (XmlSchemaProvider provider : XmlSchemaProvider.getAvailableProviders(file)) {
    String prefix = provider.getDefaultPrefix(namespace, file);
    if (prefix != null) {
      return prefix;
    }
  }
  return null; 
}
 

import com.intellij.xml.XmlSchemaProvider; //导入依赖的package包/类
/** Given a prefix in a file and a set of candidate namespaces, returns the namespace that matches the prefix (if any)
 * as determined by the {@link XmlSchemaProvider#getDefaultPrefix(String, XmlFile)}
 * implementations */
@Nullable
public static String getUnboundNamespaceForPrefix(String prefix, XmlFile xmlFile, Set<String> namespaces) {
  final List<XmlSchemaProvider> providers = XmlSchemaProvider.getAvailableProviders(xmlFile);
  for (XmlSchemaProvider provider : providers) {
    for (String namespace : namespaces) {
      if (prefix.equals(provider.getDefaultPrefix(namespace, xmlFile))) {
        return namespace;
      }
    }
  }
  return null;
}
 

import com.intellij.xml.XmlSchemaProvider; //导入依赖的package包/类
@Nullable
public PsiFile getResourceLocation(@NotNull @NonNls final String url, @NotNull final PsiFile baseFile, final String version) {
  final XmlFile schema = XmlSchemaProvider.findSchema(url, baseFile);
  if (schema != null) {
    return schema;
  }
  final String location = getResourceLocation(url, version, baseFile.getProject());
  return XmlUtil.findXmlFile(baseFile, location);
}
 

import com.intellij.xml.XmlSchemaProvider; //导入依赖的package包/类
@Nullable
public static XmlFile findNamespace(@NotNull PsiFile base, @NotNull String nsLocation)
{
	final String location = ExternalResourceManager.getInstance().getResourceLocation(nsLocation, base.getProject());
	if(!location.equals(nsLocation))
	{ // is mapped
		return findXmlFile(base, location);
	}
	final XmlFile xmlFile = XmlSchemaProvider.findSchema(location, base);
	return xmlFile == null ? findXmlFile(base, location) : xmlFile;
}
 

import com.intellij.xml.XmlSchemaProvider; //导入依赖的package包/类
@Override
@Nullable
public PsiFile getResourceLocation(@NotNull @NonNls final String url, @NotNull final PsiFile baseFile, final String version)
{
	final XmlFile schema = XmlSchemaProvider.findSchema(url, baseFile);
	if(schema != null)
	{
		return schema;
	}
	final String location = getResourceLocation(url, version, baseFile.getProject());
	return XmlUtil.findXmlFile(baseFile, location);
}