Java JavacFileManager类代码示例

import com.sun.tools.javac.file.JavacFileManager; //导入依赖的package包/类
@Test
public void testDirectAccess1() throws Exception {
    JavaFileObject srcFile = createSimpleJavaFileObject();
    Iterable<? extends JavaFileObject> files = Arrays.asList(srcFile);
    Context c = new Context();
    Messager.preRegister(c, "javadoc");
    try (StandardJavaFileManager fm = new JavacFileManager(c, true, null)) {
        File outDir = getOutDir();
        fm.setLocation(DocumentationTool.Location.DOCUMENTATION_OUTPUT, Arrays.asList(outDir));
        DocumentationTask t = new JavadocTaskImpl(c, null, null, files);
        if (t.call()) {
            System.err.println("task succeeded");
        } else {
            throw new Exception("task failed");
        }
    }
}
 

import com.sun.tools.javac.file.JavacFileManager; //导入依赖的package包/类
@Test
public void testDirectAccess2() throws Exception {
    JavaFileObject srcFile = null; // error, provokes NPE
    Iterable<? extends JavaFileObject> files = Arrays.asList(srcFile);
    Context c = new Context();
    Messager.preRegister(c, "javadoc");
    try (StandardJavaFileManager fm = new JavacFileManager(c, true, null)) {
        File outDir = getOutDir();
        fm.setLocation(DocumentationTool.Location.DOCUMENTATION_OUTPUT, Arrays.asList(outDir));
        try {
            DocumentationTask t = new JavadocTaskImpl(c, null, null, files);;
            error("getTask succeeded, no exception thrown");
        } catch (NullPointerException e) {
            System.err.println("exception caught as expected: " + e);
        }
    }
}
 

import com.sun.tools.javac.file.JavacFileManager; //导入依赖的package包/类
/**
 * Returns an empty processor iterator if no processors are on the
 * relevant path, otherwise if processors are present, logs an
 * error.  Called when a service loader is unavailable for some
 * reason, either because a service loader class cannot be found
 * or because a security policy prevents class loaders from being
 * created.
 *
 * @param key The resource key to use to log an error message
 * @param e   If non-null, pass this exception to Abort
 */
private Iterator<Processor> handleServiceLoaderUnavailability(String key, Exception e) {
    JavaFileManager fileManager = context.get(JavaFileManager.class);

    if (fileManager instanceof JavacFileManager) {
        StandardJavaFileManager standardFileManager = (JavacFileManager) fileManager;
        Iterable<? extends File> workingPath = fileManager.hasLocation(ANNOTATION_PROCESSOR_PATH)
            ? standardFileManager.getLocation(ANNOTATION_PROCESSOR_PATH)
            : standardFileManager.getLocation(CLASS_PATH);

        if (needClassLoader(options.get(PROCESSOR), workingPath) )
            handleException(key, e);

    } else {
        handleException(key, e);
    }

    java.util.List<Processor> pl = Collections.emptyList();
    return pl.iterator();
}
 

import com.sun.tools.javac.file.JavacFileManager; //导入依赖的package包/类
/**
 * Constructor
 *
 * @param context      Context for this javadoc instance.
 */
protected DocEnv(Context context) {
    context.put(docEnvKey, this);
    this.context = context;

    messager = Messager.instance0(context);
    syms = Symtab.instance(context);
    reader = JavadocClassReader.instance0(context);
    enter = JavadocEnter.instance0(context);
    names = Names.instance(context);
    externalizableSym = reader.enterClass(names.fromString("java.io.Externalizable"));
    chk = Check.instance(context);
    types = Types.instance(context);
    fileManager = context.get(JavaFileManager.class);
    if (fileManager instanceof JavacFileManager) {
        ((JavacFileManager)fileManager).setSymbolFileEnabled(false);
    }

    // Default.  Should normally be reset with setLocale.
    this.doclocale = new DocLocale(this, "", breakiterator);
    source = Source.instance(context);
}
 

import com.sun.tools.javac.file.JavacFileManager; //导入依赖的package包/类
/**
 * Returns an empty processor iterator if no processors are on the
 * relevant path, otherwise if processors are present, logs an
 * error.  Called when a service loader is unavailable for some
 * reason, either because a service loader class cannot be found
 * or because a security policy prevents class loaders from being
 * created.
 *
 * @param key The resource key to use to log an error message
 * @param e   If non-null, pass this exception to Abort
 */
private Iterator<Processor> handleServiceLoaderUnavailability(String key, Exception e) {
    if (fileManager instanceof JavacFileManager) {
        StandardJavaFileManager standardFileManager = (JavacFileManager) fileManager;
        Iterable<? extends Path> workingPath = fileManager.hasLocation(ANNOTATION_PROCESSOR_PATH)
            ? standardFileManager.getLocationAsPaths(ANNOTATION_PROCESSOR_PATH)
            : standardFileManager.getLocationAsPaths(CLASS_PATH);

        if (needClassLoader(options.get(Option.PROCESSOR), workingPath) )
            handleException(key, e);

    } else {
        handleException(key, e);
    }

    java.util.List<Processor> pl = Collections.emptyList();
    return pl.iterator();
}
 

import com.sun.tools.javac.file.JavacFileManager; //导入依赖的package包/类
@Override @DefinedBy(Api.COMPILER)
public JavacFileManager getStandardFileManager(
    DiagnosticListener<? super JavaFileObject> diagnosticListener,
    Locale locale,
    Charset charset) {
    Context context = new Context();
    context.put(Locale.class, locale);
    if (diagnosticListener != null)
        context.put(DiagnosticListener.class, diagnosticListener);
    PrintWriter pw = (charset == null)
            ? new PrintWriter(System.err, true)
            : new PrintWriter(new OutputStreamWriter(System.err, charset), true);
    context.put(Log.errKey, pw);
    CacheFSInfo.preRegister(context);
    return new JavacFileManager(context, true, charset);
}
 

import com.sun.tools.javac.file.JavacFileManager; //导入依赖的package包/类
/**
 * Constructor
 *
 * @param context      Context for this javadoc instance.
 */
protected ToolEnvironment(Context context) {
    context.put(ToolEnvKey, this);
    this.context = context;

    messager = Messager.instance0(context);
    syms = Symtab.instance(context);
    finder = JavadocClassFinder.instance(context);
    enter = JavadocEnter.instance(context);
    names = Names.instance(context);
    externalizableSym = syms.enterClass(syms.java_base, names.fromString("java.io.Externalizable"));
    chk = Check.instance(context);
    types = com.sun.tools.javac.code.Types.instance(context);
    fileManager = context.get(JavaFileManager.class);
    if (fileManager instanceof JavacFileManager) {
        ((JavacFileManager)fileManager).setSymbolFileEnabled(false);
    }
    docTrees = JavacTrees.instance(context);
    source = Source.instance(context);
    elements =  JavacElements.instance(context);
    typeutils = JavacTypes.instance(context);
    elementToTreePath = new HashMap<>();
}
 

import com.sun.tools.javac.file.JavacFileManager; //导入依赖的package包/类
/**
 * Constructor
 *
 * @param context      Context for this javadoc instance.
 */
protected DocEnv(Context context) {
    context.put(docEnvKey, this);
    this.context = context;

    messager = Messager.instance0(context);
    syms = Symtab.instance(context);
    finder = JavadocClassFinder.instance(context);
    enter = JavadocEnter.instance(context);
    names = Names.instance(context);
    externalizableSym = syms.enterClass(syms.java_base, names.fromString("java.io.Externalizable"));
    chk = Check.instance(context);
    types = Types.instance(context);
    fileManager = context.get(JavaFileManager.class);
    if (fileManager instanceof JavacFileManager) {
        ((JavacFileManager)fileManager).setSymbolFileEnabled(false);
    }

    // Default.  Should normally be reset with setLocale.
    this.doclocale = new DocLocale(this, "", breakiterator);
    source = Source.instance(context);
}
 

import com.sun.tools.javac.file.JavacFileManager; //导入依赖的package包/类
void run() throws Exception {
    RelativeFile TEST_ENTRY_NAME = new RelativeFile("java/lang/String.class");

    File testJar = createJar("test.jar", "java.lang.*");

    try (JarFile j = new JarFile(testJar)) {
        JarEntry je = j.getJarEntry(TEST_ENTRY_NAME.getPath());
        long jarEntryTime = je.getTime();

        Context context = new Context();
        JavacFileManager fm = new JavacFileManager(context, false, null);
        fm.setLocation(StandardLocation.CLASS_PATH, Collections.singletonList(testJar));
        FileObject fo =
            fm.getFileForInput(StandardLocation.CLASS_PATH, "", TEST_ENTRY_NAME.getPath());
        long jfoTime = fo.getLastModified();

        check(je, jarEntryTime, fo, jfoTime);

        if (errors > 0)
            throw new Exception(errors + " occurred");
    }
}
 

import com.sun.tools.javac.file.JavacFileManager; //导入依赖的package包/类
public static void main(String... args) throws Throwable {
    String self = T6358166.class.getName();

    String testSrc = System.getProperty("test.src");

    JavacFileManager fm = new JavacFileManager(new Context(), false, null);
    JavaFileObject f = fm.getJavaFileObject(testSrc + File.separatorChar + self + ".java");

    List<String> addExports = Arrays.asList(
            "--add-exports", "jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED",
            "--add-exports", "jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED",
            "--add-exports", "jdk.compiler/com.sun.tools.javac.main=ALL-UNNAMED",
            "--add-exports", "jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED");

    test(fm, f, addExports, "-verbose", "-d", ".");

    test(fm, f, addExports, "-verbose", "-d", ".", "-XprintRounds", "-processorpath", ".", "-processor", self);
}
 

import com.sun.tools.javac.file.JavacFileManager; //导入依赖的package包/类
static void test(JavacFileManager fm, JavaFileObject f, List<String> addExports, String... args) throws Throwable {
    List<String> allArgs = new ArrayList<>();
    allArgs.addAll(addExports);
    allArgs.addAll(Arrays.asList(args));

    Context context = new Context();

    JavacTool tool = JavacTool.create();
    JavacTaskImpl task = (JavacTaskImpl) tool.getTask(null, fm, null, allArgs, null, List.of(f), context);
    task.call();

    JavaCompiler c = JavaCompiler.instance(context);
    if (c.errorCount() != 0)
        throw new AssertionError("compilation failed");

    long msec = c.elapsed_msec;
    if (msec < 0 || msec > 5 * 60 * 1000) // allow test 5 mins to execute, should be more than enough!
        throw new AssertionError("elapsed time is suspect: " + msec);
}
 

import com.sun.tools.javac.file.JavacFileManager; //导入依赖的package包/类
public static void main(String... args) {
    JavaCompiler compiler = JavaCompiler.instance(new Context());
    compiler.keepComments = true;

    String testSrc = System.getProperty("test.src");
    JavacFileManager fm = new JavacFileManager(new Context(), false, null);
    JavaFileObject f = fm.getJavaFileObject(testSrc + File.separatorChar + "T4910483.java");

    JCTree.JCCompilationUnit cu = compiler.parse(f);
    JCTree classDef = cu.getTypeDecls().head;
    String commentText = cu.docComments.getCommentText(classDef);

    String expected = "Test comment abc*\\\\def"; // 4 '\' escapes to 2 in a string literal
    if (!expected.equals(commentText)) {
        throw new AssertionError("Incorrect comment text: [" + commentText + "], expected [" + expected + "]");
    }
}
 

import com.sun.tools.javac.file.JavacFileManager; //导入依赖的package包/类
void run() throws Exception {
    Context context = new Context();
    JavacFileManager.preRegister(context);
    Symtab syms = Symtab.instance(context);
    maker = TreeMaker.instance(context);
    types = Types.instance(context);

    test("abc",                     CLASS,      syms.stringType,    "abc");
    test(Boolean.FALSE,             BOOLEAN,    syms.booleanType,   Integer.valueOf(0));
    test(Boolean.TRUE,              BOOLEAN,    syms.booleanType,   Integer.valueOf(1));
    test(Byte.valueOf((byte) 1),    BYTE,       syms.byteType,      Byte.valueOf((byte) 1));
    test(Character.valueOf('a'),    CHAR,       syms.charType,      Integer.valueOf('a'));
    test(Double.valueOf(1d),        DOUBLE,     syms.doubleType,    Double.valueOf(1d));
    test(Float.valueOf(1f),         FLOAT,      syms.floatType,     Float.valueOf(1f));
    test(Integer.valueOf(1),        INT,        syms.intType,       Integer.valueOf(1));
    test(Long.valueOf(1),           LONG,       syms.longType,      Long.valueOf(1));
    test(Short.valueOf((short) 1),  SHORT,      syms.shortType,     Short.valueOf((short) 1));

    if (errors > 0)
        throw new Exception(errors + " errors found");
}
 

import com.sun.tools.javac.file.JavacFileManager; //导入依赖的package包/类
void run() throws Exception {
    Context context = new Context();
    JavacFileManager.preRegister(context);
    final JavaCompiler tool = ToolProvider.getSystemJavaCompiler();
    JavacTask ct = (JavacTask)tool.getTask(null, null, null, null, null, Arrays.asList(new JavaSource()));
    Iterable<? extends CompilationUnitTree> elements = ct.parse();
    ct.analyze();
    Assert.check(elements.iterator().hasNext());
    JCTree topLevel = (JCTree)elements.iterator().next();
    new TreeScanner() {
        @Override
        public void visitReference(JCMemberReference tree) {
            Assert.check(tree.getOverloadKind() != null);
        }
    }.scan(topLevel);
}
 

import com.sun.tools.javac.file.JavacFileManager; //导入依赖的package包/类
public static void main(String... args) throws Throwable {

        JavacFileManager fm = new JavacFileManager(new Context(), false, null);
        List<JavaFileObject> files = toList(fm.getJavaFileObjects(new File(testSrc, self + ".java")));

        try {
            // first, test case with no annotation processing
            testNoAnnotationProcessing(fm, files);

            // now, test case with annotation processing
            testAnnotationProcessing(fm, files);
        }
        catch (Throwable t) {
            throw new AssertionError(t);
        }
    }