import com.intellij.patterns.PsiFilePattern; //导入依赖的package包/类
public static PsiFilePattern.Capture<PsiFile> getXmlFilePattern(@Nullable String fileName) {
    if (fileName == null) {
        return getXmlFilePattern();
    }

    return XmlPatterns.psiFile()
                      .withName(XmlPatterns.string().equalTo(fileName + ".xml"));
}
 

import com.intellij.patterns.PsiFilePattern; //导入依赖的package包/类
/**
 * Checks if its a file of expect type
 */
static PsiFilePattern.Capture<PsiFile> matchFileType(final String... extensions) {
    return new PsiFilePattern.Capture<>(new InitialPatternCondition<PsiFile>(PsiFile.class) {
        @Override
        public boolean accepts(@Nullable Object o, ProcessingContext context) {
                if (o instanceof PsiFile) {
                return getIdeaUtils().isFromFileType((PsiElement) o, extensions);
            }
            return false;
        }
    });
}
 

import com.intellij.patterns.PsiFilePattern; //导入依赖的package包/类
public PatternCondition(PsiFilePattern pattern) {
  myPattern = pattern;
}
 

import com.intellij.patterns.PsiFilePattern; //导入依赖的package包/类
private PsiFilePattern.Capture<PsiFile> getMetadataFilePattern() {
    return PlatformPatterns.psiFile().withName(PlatformPatterns.string().endsWith("toolbox.metadata.json"));
}