Examples with PsiTreeChangePreprocessor com.intellij.psi.impl.PsiTreeChangePreprocessor used on opensource projects

Example 1 with PsiTreeChangePreprocessor

use of com.intellij.psi.impl.PsiTreeChangePreprocessor in project intellij-community by JetBrains.

the class PsiEventsTest method testTreeChangePreprocessorThrowsException.

public void testTreeChangePreprocessorThrowsException() throws Exception {
    VirtualFile vFile = createFile("a.xml", "<tag/>").getVirtualFile();
    Document document = FileDocumentManager.getInstance().getDocument(vFile);
    assert document != null;
    PsiTreeChangePreprocessor preprocessor = event -> {
        if (!event.getCode().name().startsWith("BEFORE") && !event.isGenericChange()) {
            throw new NullPointerException();
        }
    };
    ((PsiManagerImpl) getPsiManager()).addTreeChangePreprocessor(preprocessor);
    try {
        WriteCommandAction.runWriteCommandAction(myProject, () -> document.insertString(0, " "));
        PsiDocumentManager.getInstance(myProject).commitAllDocuments();
        fail("NPE expected");
    } catch (NullPointerException ignore) {
    } finally {
        ((PsiManagerImpl) getPsiManager()).removeTreeChangePreprocessor(preprocessor);
    }
    WriteCommandAction.runWriteCommandAction(myProject, () -> document.insertString(0, " "));
    PsiDocumentManager.getInstance(myProject).commitAllDocuments();
    assertEquals("  <tag/>", getPsiManager().findFile(vFile).getText());
}