Java JavaClass类代码示例

import com.sun.org.apache.bcel.internal.classfile.JavaClass; //导入依赖的package包/类
/**
 * @return the (finally) built up Java class object.
 */
public JavaClass getJavaClass() {
    final int[] interfaces = getInterfaces();
    final Field[] fields = getFields();
    final Method[] methods = getMethods();
    Attribute[] attributes;
    if (annotation_vec.isEmpty()) {
        attributes = getAttributes();
    } else {
        // TODO: Sometime later, trash any attributes called 'RuntimeVisibleAnnotations' or 'RuntimeInvisibleAnnotations'
        final Attribute[] annAttributes = AnnotationEntryGen.getAnnotationAttributes(cp, getAnnotationEntries());
        attributes = new Attribute[attribute_vec.size() + annAttributes.length];
        attribute_vec.toArray(attributes);
        System.arraycopy(annAttributes, 0, attributes, attribute_vec.size(), annAttributes.length);
    }
    // Must be last since the above calls may still add something to it
    final ConstantPool _cp = this.cp.getFinalConstantPool();
    return new JavaClass(class_name_index, superclass_name_index, file_name, major, minor,
            super.getAccessFlags(), _cp, interfaces, fields, methods, attributes);
}
 

import com.sun.org.apache.bcel.internal.classfile.JavaClass; //导入依赖的package包/类
/**
 * Finds a JavaClass object by name. If it is already in this Repository, the
 * Repository version is returned.
 *
 * @param className the name of the class
 * @return the JavaClass object
 * @throws ClassNotFoundException if the class is not in the Repository
 */
@Override
public JavaClass loadClass(String className) throws ClassNotFoundException {
    if ((className == null) || className.isEmpty()) {
        throw new IllegalArgumentException("Invalid class name " + className);
    }
    className = className.replace('/', '.'); // Just in case, canonical form
    final JavaClass clazz = findClass(className);
    if (clazz != null) {
        return clazz;
    }

    IOException e = new IOException("Couldn't find: " + className + ".class");
    throw new ClassNotFoundException("Exception while looking for class " +
            className + ": " + e, e);
}
 

import com.sun.org.apache.bcel.internal.classfile.JavaClass; //导入依赖的package包/类
/**
 * If "this" doesn't reference a class, it references an interface
 * or a non-existant entity.
 */
public boolean referencesClass(){
  JavaClass jc = Repository.lookupClass(class_name);
  if (jc == null)
    return false;
  else
    return jc.isClass();
}
 

import com.sun.org.apache.bcel.internal.classfile.JavaClass; //导入依赖的package包/类
/**
 * If "this" doesn't reference an interface, it references a class
 * or a non-existant entity.
 */
public boolean referencesInterface(){
  JavaClass jc = Repository.lookupClass(class_name);
  if (jc == null)
    return false;
  else
    return !jc.isClass();
}
 

import com.sun.org.apache.bcel.internal.classfile.JavaClass; //导入依赖的package包/类
/**
 * Java Virtual Machine Specification edition 2, 5.4.4 Access Control
 */
public boolean accessibleTo(ObjectType accessor) {
  JavaClass jc = Repository.lookupClass(class_name);

  if(jc.isPublic()) {
    return true;
  } else {
    JavaClass acc = Repository.lookupClass(accessor.class_name);
    return acc.getPackageName().equals(jc.getPackageName());
  }
}
 

import com.sun.org.apache.bcel.internal.classfile.JavaClass; //导入依赖的package包/类
/** Lookup class somewhere found on your CLASSPATH, or whereever the
 * repository instance looks for it.
 *
 * @return class object for given fully qualified class name, or null
 * if the class could not be found or parsed correctly
 */
public static JavaClass lookupClass(String class_name) {
  try {
    JavaClass clazz = _repository.findClass(class_name);

    if(clazz == null) {
      return _repository.loadClass(class_name);
    } else {
      return clazz;
    }
  } catch(ClassNotFoundException ex) { return null; }
}
 

import com.sun.org.apache.bcel.internal.classfile.JavaClass; //导入依赖的package包/类
public boolean add(JavaClass clazz) {
  boolean result = false;

  if(!_map.containsKey(clazz.getClassName())) {
    result = true;
    _map.put(clazz.getClassName(), clazz);
  }

  return result;
}
 

import com.sun.org.apache.bcel.internal.classfile.JavaClass; //导入依赖的package包/类
public void dumpClass(JavaClass clazz) {

        if (_outputType == BYTEARRAY_AND_FILE_OUTPUT)
        {
            File outFile = getOutputFile(clazz.getClassName());
            String parentDir = outFile.getParent();
            if (parentDir != null) {
                File parentFile = new File(parentDir);
                if (!SecuritySupport.getFileExists(parentFile))
                    parentFile.mkdirs();
            }
        }

        try {
            switch (_outputType) {
            case JAR_OUTPUT:
                _bcelClasses.add(clazz);
                break;
            case BYTEARRAY_OUTPUT:
            case BYTEARRAY_AND_FILE_OUTPUT:
            case BYTEARRAY_AND_JAR_OUTPUT:
            case CLASSLOADER_OUTPUT:
                ByteArrayOutputStream out = new ByteArrayOutputStream(2048);
                clazz.dump(out);
                _classes.add(out);

                if (_outputType == BYTEARRAY_AND_FILE_OUTPUT)
                  clazz.dump(getOutputFile(clazz.getClassName()));
                else if (_outputType == BYTEARRAY_AND_JAR_OUTPUT)
                  _bcelClasses.add(clazz);

                break;
            }
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }
 

import com.sun.org.apache.bcel.internal.classfile.JavaClass; //导入依赖的package包/类
/**
 * Generate output JAR-file and packages
 */
public void outputToJar() throws IOException {
    // create the manifest
    final Manifest manifest = new Manifest();
    final java.util.jar.Attributes atrs = manifest.getMainAttributes();
    atrs.put(java.util.jar.Attributes.Name.MANIFEST_VERSION, "1.2");

    final Map<String, Attributes> map = manifest.getEntries();
    // create manifest
    final String now = (new Date()).toString();
    final java.util.jar.Attributes.Name dateAttr =
        new java.util.jar.Attributes.Name("Date");

    final File jarFile = new File(_destDir, _jarFileName);
    final JarOutputStream jos =
        new JarOutputStream(new FileOutputStream(jarFile), manifest);

    for (JavaClass clazz : _bcelClasses) {
        final String className = clazz.getClassName().replace('.', '/');
        final java.util.jar.Attributes attr = new java.util.jar.Attributes();
        attr.put(dateAttr, now);
        map.put(className + ".class", attr);
        jos.putNextEntry(new JarEntry(className + ".class"));
        final ByteArrayOutputStream out = new ByteArrayOutputStream(2048);
        clazz.dump(out); // dump() closes it's output stream
        out.writeTo(jos);
    }
    jos.close();
}
 

import com.sun.org.apache.bcel.internal.classfile.JavaClass; //导入依赖的package包/类
/**
 * If "this" doesn't reference a class, it references an interface
 * or a non-existant entity.
 * @deprecated (since 6.0) this method returns an inaccurate result
 *   if the class or interface referenced cannot
 *   be found: use referencesClassExact() instead
 */
@Deprecated
public boolean referencesClass() {
    try {
        final JavaClass jc = Repository.lookupClass(class_name);
        return jc.isClass();
    } catch (final ClassNotFoundException e) {
        return false;
    }
}
 

import com.sun.org.apache.bcel.internal.classfile.JavaClass; //导入依赖的package包/类
/**
 * If "this" doesn't reference an interface, it references a class
 * or a non-existant entity.
 * @deprecated (since 6.0) this method returns an inaccurate result
 *   if the class or interface referenced cannot
 *   be found: use referencesInterfaceExact() instead
 */
@Deprecated
public boolean referencesInterface() {
    try {
        final JavaClass jc = Repository.lookupClass(class_name);
        return !jc.isClass();
    } catch (final ClassNotFoundException e) {
        return false;
    }
}
 

import com.sun.org.apache.bcel.internal.classfile.JavaClass; //导入依赖的package包/类
/**
 * Java Virtual Machine Specification edition 2,  5.4.4 Access Control
 * @throws ClassNotFoundException if the class referenced by this type
 *   can't be found
 */
public boolean accessibleTo( final ObjectType accessor ) throws ClassNotFoundException {
    final JavaClass jc = Repository.lookupClass(class_name);
    if (jc.isPublic()) {
        return true;
    }
    final JavaClass acc = Repository.lookupClass(accessor.class_name);
    return acc.getPackageName().equals(jc.getPackageName());
}
 

import com.sun.org.apache.bcel.internal.classfile.JavaClass; //导入依赖的package包/类
/**
 * Initialize with existing class.
 *
 * @param clazz JavaClass object (e.g. read from file)
 */
public ClassGen(final JavaClass clazz) {
    super(clazz.getAccessFlags());
    class_name_index = clazz.getClassNameIndex();
    superclass_name_index = clazz.getSuperclassNameIndex();
    class_name = clazz.getClassName();
    super_class_name = clazz.getSuperclassName();
    file_name = clazz.getSourceFileName();
    cp = new ConstantPoolGen(clazz.getConstantPool());
    major = clazz.getMajor();
    minor = clazz.getMinor();
    final Attribute[] attributes = clazz.getAttributes();
    // J5TODO: Could make unpacking lazy, done on first reference
    final AnnotationEntryGen[] annotations = unpackAnnotations(attributes);
    final Method[] methods = clazz.getMethods();
    final Field[] fields = clazz.getFields();
    final String[] interfaces = clazz.getInterfaceNames();
    for (final String interface1 : interfaces) {
        addInterface(interface1);
    }
    for (final Attribute attribute : attributes) {
        if (!(attribute instanceof Annotations)) {
            addAttribute(attribute);
        }
    }
    for (final AnnotationEntryGen annotation : annotations) {
        addAnnotationEntry(annotation);
    }
    for (final Method method : methods) {
        addMethod(method);
    }
    for (final Field field : fields) {
        addField(field);
    }
}
 

import com.sun.org.apache.bcel.internal.classfile.JavaClass; //导入依赖的package包/类
/**
 * Write contents of the given JavaClass into HTML files.
 *
 * @param java_class The class to write
 * @param dir The directory to put the files in
 */
public Class2HTML(final JavaClass java_class, final String dir) throws IOException {
    final Method[] methods = java_class.getMethods();
    this.java_class = java_class;
    this.dir = dir;
    class_name = java_class.getClassName(); // Remember full name
    constant_pool = java_class.getConstantPool();
    // Get package name by tacking off everything after the last `.'
    final int index = class_name.lastIndexOf('.');
    if (index > -1) {
        class_package = class_name.substring(0, index);
    } else {
        class_package = ""; // default package
    }
    final ConstantHTML constant_html = new ConstantHTML(dir, class_name, class_package, methods,
            constant_pool);
    /* Attributes can't be written in one step, so we just open a file
     * which will be written consequently.
     */
    final AttributeHTML attribute_html = new AttributeHTML(dir, class_name, constant_pool,
            constant_html);
    new MethodHTML(dir, class_name, methods, java_class.getFields(),
            constant_html, attribute_html);
    // Write main file (with frames, yuk)
    writeMainHTML(attribute_html);
    new CodeHTML(dir, class_name, methods, constant_pool, constant_html);
    attribute_html.close();
}
 

import com.sun.org.apache.bcel.internal.classfile.JavaClass; //导入依赖的package包/类
/**
 * Find an already defined (cached) JavaClass object by name.
 */
@Override
public JavaClass findClass(final String className) {
    final SoftReference<JavaClass> ref = loadedClasses.get(className);
    if (ref == null) {
        return null;
    }
    return ref.get();
}