| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| /* |
| * Copyright (C) 2006-2007 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package java.lang; |
| |
| import dalvik.system.VMStack; |
| import java.io.InputStream; |
| import java.io.Serializable; |
| import java.lang.annotation.Annotation; |
| import java.lang.annotation.Inherited; |
| import java.lang.reflect.AnnotatedElement; |
| import java.lang.reflect.Constructor; |
| import java.lang.reflect.Field; |
| import java.lang.reflect.GenericDeclaration; |
| import java.lang.reflect.Member; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Modifier; |
| import java.lang.reflect.Type; |
| import java.lang.reflect.TypeVariable; |
| import java.net.URL; |
| import java.security.ProtectionDomain; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.HashMap; |
| import java.util.List; |
| import libcore.util.CollectionUtils; |
| import libcore.util.EmptyArray; |
| import org.apache.harmony.kernel.vm.StringUtils; |
| import org.apache.harmony.luni.lang.reflect.GenericSignatureParser; |
| import org.apache.harmony.luni.lang.reflect.Types; |
| |
| /** |
| * The in-memory representation of a Java class. This representation serves as |
| * the starting point for querying class-related information, a process usually |
| * called "reflection". There are basically three types of {@code Class} |
| * instances: those representing real classes and interfaces, those representing |
| * primitive types, and those representing array classes. |
| * |
| * <h4>Class instances representing object types (classes or interfaces)</h4> |
| * <p> |
| * These represent an ordinary class or interface as found in the class |
| * hierarchy. The name associated with these {@code Class} instances is simply |
| * the fully qualified class name of the class or interface that it represents. |
| * In addition to this human-readable name, each class is also associated by a |
| * so-called <em>signature</em>, which is the letter "L", followed by the |
| * class name and a semicolon (";"). The signature is what the runtime system |
| * uses internally for identifying the class (for example in a DEX file). |
| * </p> |
| * <h4>Classes representing primitive types</h4> |
| * <p> |
| * These represent the standard Java primitive types and hence share their |
| * names (for example "int" for the {@code int} primitive type). Although it is |
| * not possible to create new instances based on these {@code Class} instances, |
| * they are still useful for providing reflection information, and as the |
| * component type of array classes. There is one {@code Class} instance for each |
| * primitive type, and their signatures are: |
| * </p> |
| * <ul> |
| * <li>{@code B} representing the {@code byte} primitive type</li> |
| * <li>{@code S} representing the {@code short} primitive type</li> |
| * <li>{@code I} representing the {@code int} primitive type</li> |
| * <li>{@code J} representing the {@code long} primitive type</li> |
| * <li>{@code F} representing the {@code float} primitive type</li> |
| * <li>{@code D} representing the {@code double} primitive type</li> |
| * <li>{@code C} representing the {@code char} primitive type</li> |
| * <li>{@code Z} representing the {@code boolean} primitive type</li> |
| * <li>{@code V} representing void function return values</li> |
| * </ul> |
| * <p> |
| * <h4>Classes representing array classes</h4> |
| * <p> |
| * These represent the classes of Java arrays. There is one such {@code Class} |
| * instance per combination of array leaf component type and arity (number of |
| * dimensions). In this case, the name associated with the {@code Class} |
| * consists of one or more left square brackets (one per dimension in the array) |
| * followed by the signature of the class representing the leaf component type, |
| * which can be either an object type or a primitive type. The signature of a |
| * {@code Class} representing an array type is the same as its name. Examples |
| * of array class signatures are: |
| * </p> |
| * <ul> |
| * <li>{@code [I} representing the {@code int[]} type</li> |
| * <li>{@code [Ljava/lang/String;} representing the {@code String[]} type</li> |
| * <li>{@code [[[C} representing the {@code char[][][]} type (three dimensions!)</li> |
| * </ul> |
| */ |
| public final class Class<T> implements Serializable, AnnotatedElement, GenericDeclaration, Type { |
| |
| private static final long serialVersionUID = 3206093459760846163L; |
| |
| /** |
| * Lazily computed name of this class; always prefer calling getName(). |
| */ |
| private transient String name; |
| |
| private Class() { |
| // Prevent this class to be instantiated, instance |
| // should be created by JVM only |
| } |
| |
| /** |
| * Get the Signature attribute for this class. Returns null if not found. |
| */ |
| private String getSignatureAttribute() { |
| Object[] annotation = getSignatureAnnotation(); |
| |
| if (annotation == null) { |
| return null; |
| } |
| |
| return StringUtils.combineStrings(annotation); |
| } |
| |
| /** |
| * Get the Signature annotation for this class. Returns null if not found. |
| */ |
| native private Object[] getSignatureAnnotation(); |
| |
| /** |
| * Returns a {@code Class} object which represents the class with the |
| * given name. The name should be the name of a non-primitive class, as described in |
| * the {@link Class class definition}. |
| * Primitive types can not be found using this method; use {@code int.class} or {@code Integer.TYPE} instead. |
| * |
| * <p>If the class has not yet been loaded, it is loaded and initialized |
| * first. This is done through either the class loader of the calling class |
| * or one of its parent class loaders. It is possible that a static initializer is run as |
| * a result of this call. |
| * |
| * @throws ClassNotFoundException |
| * if the requested class can not be found. |
| * @throws LinkageError |
| * if an error occurs during linkage |
| * @throws ExceptionInInitializerError |
| * if an exception occurs during static initialization of a |
| * class. |
| */ |
| public static Class<?> forName(String className) throws ClassNotFoundException { |
| return forName(className, true, VMStack.getCallingClassLoader()); |
| } |
| |
| /** |
| * Returns a {@code Class} object which represents the class with the |
| * given name. The name should be the name of a non-primitive class, as described in |
| * the {@link Class class definition}. |
| * Primitive types can not be found using this method; use {@code int.class} or {@code Integer.TYPE} instead. |
| * |
| * <p>If the class has not yet been loaded, it is loaded first, using the given class loader. |
| * If the class has not yet been initialized and {@code shouldInitialize} is true, |
| * the class will be initialized. |
| * |
| * @throws ClassNotFoundException |
| * if the requested class can not be found. |
| * @throws LinkageError |
| * if an error occurs during linkage |
| * @throws ExceptionInInitializerError |
| * if an exception occurs during static initialization of a |
| * class. |
| */ |
| public static Class<?> forName(String className, boolean shouldInitialize, |
| ClassLoader classLoader) throws ClassNotFoundException { |
| |
| if (classLoader == null) { |
| classLoader = ClassLoader.getSystemClassLoader(); |
| } |
| // Catch an Exception thrown by the underlying native code. It wraps |
| // up everything inside a ClassNotFoundException, even if e.g. an |
| // Error occurred during initialization. This as a workaround for |
| // an ExceptionInInitializerError that's also wrapped. It is actually |
| // expected to be thrown. Maybe the same goes for other errors. |
| // Not wrapping up all the errors will break android though. |
| Class<?> result; |
| try { |
| result = classForName(className, shouldInitialize, |
| classLoader); |
| } catch (ClassNotFoundException e) { |
| Throwable cause = e.getCause(); |
| if (cause instanceof ExceptionInInitializerError) { |
| throw (ExceptionInInitializerError) cause; |
| } |
| throw e; |
| } |
| return result; |
| } |
| |
| private static native Class<?> classForName(String className, boolean shouldInitialize, |
| ClassLoader classLoader) throws ClassNotFoundException; |
| |
| /** |
| * Returns an array containing {@code Class} objects for all public classes |
| * and interfaces that are members of this class. This includes public |
| * members inherited from super classes and interfaces. If there are no such |
| * class members or if this object represents a primitive type then an array |
| * of length 0 is returned. |
| */ |
| public Class<?>[] getClasses() { |
| Class<?>[] result = getDeclaredClasses(this, true); |
| // Traverse all superclasses. |
| for (Class<?> c = this.getSuperclass(); c != null; c = c.getSuperclass()) { |
| Class<?>[] temp = getDeclaredClasses(c, true); |
| if (temp.length != 0) { |
| result = arraycopy(new Class[result.length + temp.length], result, temp); |
| } |
| } |
| return result; |
| } |
| |
| @Override public <A extends Annotation> A getAnnotation(Class<A> annotationType) { |
| if (annotationType == null) { |
| throw new NullPointerException("annotationType == null"); |
| } |
| |
| A annotation = getDeclaredAnnotation(annotationType); |
| if (annotation != null) { |
| return annotation; |
| } |
| |
| if (annotationType.isAnnotationPresent(Inherited.class)) { |
| for (Class<?> sup = getSuperclass(); sup != null; sup = sup.getSuperclass()) { |
| annotation = sup.getDeclaredAnnotation(annotationType); |
| if (annotation != null) { |
| return annotation; |
| } |
| } |
| } |
| |
| return null; |
| } |
| |
| /** |
| * Returns an array containing all the annotations of this class. If there are no annotations |
| * then an empty array is returned. |
| * |
| * @see #getDeclaredAnnotations() |
| */ |
| public Annotation[] getAnnotations() { |
| /* |
| * We need to get the annotations declared on this class, plus the |
| * annotations from superclasses that have the "@Inherited" annotation |
| * set. We create a temporary map to use while we accumulate the |
| * annotations and convert it to an array at the end. |
| * |
| * It's possible to have duplicates when annotations are inherited. |
| * We use a Map to filter those out. |
| * |
| * HashMap might be overkill here. |
| */ |
| HashMap<Class, Annotation> map = new HashMap<Class, Annotation>(); |
| Annotation[] declaredAnnotations = getDeclaredAnnotations(); |
| |
| for (int i = declaredAnnotations.length-1; i >= 0; --i) { |
| map.put(declaredAnnotations[i].annotationType(), declaredAnnotations[i]); |
| } |
| for (Class<?> sup = getSuperclass(); sup != null; sup = sup.getSuperclass()) { |
| declaredAnnotations = sup.getDeclaredAnnotations(); |
| for (int i = declaredAnnotations.length-1; i >= 0; --i) { |
| Class<?> clazz = declaredAnnotations[i].annotationType(); |
| if (!map.containsKey(clazz) && clazz.isAnnotationPresent(Inherited.class)) { |
| map.put(clazz, declaredAnnotations[i]); |
| } |
| } |
| } |
| |
| /* convert annotation values from HashMap to array */ |
| Collection<Annotation> coll = map.values(); |
| return coll.toArray(new Annotation[coll.size()]); |
| } |
| |
| /** |
| * Returns the canonical name of this class. If this class does not have a |
| * canonical name as defined in the Java Language Specification, then the |
| * method returns {@code null}. |
| */ |
| public String getCanonicalName() { |
| if (isLocalClass() || isAnonymousClass()) |
| return null; |
| |
| if (isArray()) { |
| /* |
| * The canonical name of an array type depends on the (existence of) |
| * the component type's canonical name. |
| */ |
| String name = getComponentType().getCanonicalName(); |
| if (name != null) { |
| return name + "[]"; |
| } |
| } else if (isMemberClass()) { |
| /* |
| * The canonical name of an inner class depends on the (existence |
| * of) the declaring class' canonical name. |
| */ |
| String name = getDeclaringClass().getCanonicalName(); |
| if (name != null) { |
| return name + "." + getSimpleName(); |
| } |
| } else { |
| /* |
| * The canonical name of a top-level class or primitive type is |
| * equal to the fully qualified name. |
| */ |
| return getName(); |
| } |
| |
| /* |
| * Other classes don't have a canonical name. |
| */ |
| return null; |
| } |
| |
| /** |
| * Returns the class loader which was used to load the class represented by |
| * this {@code Class}. Implementations are free to return {@code null} for |
| * classes that were loaded by the bootstrap class loader. The Android |
| * reference implementation, though, always returns a reference to an actual |
| * class loader. |
| */ |
| public ClassLoader getClassLoader() { |
| if (this.isPrimitive()) { |
| return null; |
| } |
| |
| ClassLoader loader = getClassLoaderImpl(); |
| if (loader == null) { |
| loader = BootClassLoader.getInstance(); |
| } |
| return loader; |
| } |
| |
| /** |
| * This must be provided by the VM vendor, as it is used by other provided |
| * class implementations in this package. Outside of this class, it is used |
| * by SecurityManager.classLoaderDepth(), |
| * currentClassLoader() and currentLoadedClass(). Return the ClassLoader for |
| * this Class without doing any security checks. The bootstrap ClassLoader |
| * is returned, unlike getClassLoader() which returns null in place of the |
| * bootstrap ClassLoader. |
| */ |
| ClassLoader getClassLoaderImpl() { |
| ClassLoader loader = getClassLoader(this); |
| return loader == null ? BootClassLoader.getInstance() : loader; |
| } |
| |
| /* |
| * Returns the defining class loader for the given class. |
| */ |
| private static native ClassLoader getClassLoader(Class<?> c); |
| |
| /** |
| * Returns a {@code Class} object which represents the component type if |
| * this class represents an array type. Returns {@code null} if this class |
| * does not represent an array type. The component type of an array type is |
| * the type of the elements of the array. |
| */ |
| public native Class<?> getComponentType(); |
| |
| /** |
| * Returns a {@code Constructor} object which represents the public |
| * constructor matching the given parameter types. |
| * {@code (Class[]) null} is equivalent to the empty array. |
| * |
| * @throws NoSuchMethodException |
| * if the constructor can not be found. |
| * @see #getDeclaredConstructor(Class[]) |
| */ |
| @SuppressWarnings("unchecked") |
| public Constructor<T> getConstructor(Class<?>... parameterTypes) throws NoSuchMethodException { |
| return (Constructor) getConstructorOrMethod("<init>", false, true, parameterTypes); |
| } |
| |
| /** |
| * Returns a constructor or method with the given name. Use "<init>" to return a constructor. |
| */ |
| private Member getConstructorOrMethod(String name, boolean searchSuperTypes, |
| boolean publicOnly, Class<?>[] parameterTypes) throws NoSuchMethodException { |
| if (searchSuperTypes && !publicOnly) { |
| throw new AssertionError(); // can't lookup non-public members recursively |
| } |
| if (name == null) { |
| throw new NullPointerException("name == null"); |
| } |
| if (parameterTypes == null) { |
| parameterTypes = EmptyArray.CLASS; |
| } |
| for (Class<?> c : parameterTypes) { |
| if (c == null) { |
| throw new NoSuchMethodException("parameter type is null"); |
| } |
| } |
| Member result = searchSuperTypes |
| ? getPublicConstructorOrMethodRecursive(name, parameterTypes) |
| : Class.getDeclaredConstructorOrMethod(this, name, parameterTypes); |
| if (result == null || publicOnly && (result.getModifiers() & Modifier.PUBLIC) == 0) { |
| throw new NoSuchMethodException(name + " " + Arrays.toString(parameterTypes)); |
| } |
| return result; |
| } |
| |
| private Member getPublicConstructorOrMethodRecursive(String name, Class<?>[] parameterTypes) { |
| // search superclasses |
| for (Class<?> c = this; c != null; c = c.getSuperclass()) { |
| Member result = Class.getDeclaredConstructorOrMethod(c, name, parameterTypes); |
| if (result != null && (result.getModifiers() & Modifier.PUBLIC) != 0) { |
| return result; |
| } |
| } |
| |
| // search implemented interfaces |
| for (Class<?> c = this; c != null; c = c.getSuperclass()) { |
| for (Class<?> ifc : c.getInterfaces()) { |
| Member result = ifc.getPublicConstructorOrMethodRecursive(name, parameterTypes); |
| if (result != null && (result.getModifiers() & Modifier.PUBLIC) != 0) { |
| return result; |
| } |
| } |
| } |
| |
| return null; |
| } |
| |
| /** |
| * Returns an array containing {@code Constructor} objects for all public |
| * constructors for this {@code Class}. If there |
| * are no public constructors or if this {@code Class} represents an array |
| * class, a primitive type or void then an empty array is returned. |
| * |
| * @see #getDeclaredConstructors() |
| */ |
| public Constructor<?>[] getConstructors() { |
| return getDeclaredConstructors(this, true); |
| } |
| |
| /** |
| * Returns the annotations that are directly defined on the class |
| * represented by this {@code Class}. Annotations that are inherited are not |
| * included in the result. If there are no annotations at all, an empty |
| * array is returned. |
| * |
| * @see #getAnnotations() |
| */ |
| public native Annotation[] getDeclaredAnnotations(); |
| |
| /** |
| * Returns the annotation if it exists. |
| */ |
| native private <A extends Annotation> A getDeclaredAnnotation(Class<A> annotationClass); |
| |
| /** |
| * Returns true if the annotation exists. |
| */ |
| native private boolean isDeclaredAnnotationPresent(Class<? extends Annotation> annotationClass); |
| |
| /** |
| * Returns an array containing {@code Class} objects for all classes and |
| * interfaces that are declared as members of the class which this {@code |
| * Class} represents. If there are no classes or interfaces declared or if |
| * this class represents an array class, a primitive type or void, then an |
| * empty array is returned. |
| */ |
| public Class<?>[] getDeclaredClasses() { |
| return getDeclaredClasses(this, false); |
| } |
| |
| /* |
| * Returns the list of member classes of the given class. |
| * If no members exist, an empty array is returned. |
| */ |
| private static native Class<?>[] getDeclaredClasses(Class<?> c, boolean publicOnly); |
| |
| /** |
| * Returns a {@code Constructor} object which represents the constructor |
| * matching the given parameter types that is declared by the class |
| * represented by this {@code Class}. |
| * {@code (Class[]) null} is equivalent to the empty array. |
| * |
| * @throws NoSuchMethodException |
| * if the requested constructor can not be found. |
| * @see #getConstructor(Class[]) |
| */ |
| @SuppressWarnings("unchecked") |
| public Constructor<T> getDeclaredConstructor(Class<?>... parameterTypes) |
| throws NoSuchMethodException { |
| return (Constructor) getConstructorOrMethod("<init>", false, false, parameterTypes); |
| } |
| |
| /** |
| * Returns an array containing {@code Constructor} objects for all |
| * constructors declared in the class represented by this {@code Class}. If |
| * there are no constructors or if this {@code Class} represents an array |
| * class, a primitive type, or void then an empty array is returned. |
| * |
| * @see #getConstructors() |
| */ |
| public Constructor<?>[] getDeclaredConstructors() { |
| return getDeclaredConstructors(this, false); |
| } |
| |
| /* |
| * Returns the list of constructors. If no constructors exist, an empty array is returned. |
| */ |
| private static native <T> Constructor<T>[] getDeclaredConstructors(Class<T> c, |
| boolean publicOnly); |
| |
| /** |
| * Returns a {@code Field} object for the field with the given name |
| * which is declared in the class represented by this {@code Class}. |
| * |
| * @throws NoSuchFieldException if the requested field can not be found. |
| * @see #getField(String) |
| */ |
| public Field getDeclaredField(String name) throws NoSuchFieldException { |
| if (name == null) { |
| throw new NullPointerException("name == null"); |
| } |
| Field result = getDeclaredField(this, name); |
| if (result == null) { |
| throw new NoSuchFieldException(name); |
| } |
| return result; |
| } |
| |
| /** |
| * Returns an array containing {@code Field} objects for all fields declared |
| * in the class represented by this {@code Class}. If there are no fields or |
| * if this {@code Class} represents an array class, a primitive type or void |
| * then an empty array is returned. |
| * |
| * @see #getFields() |
| */ |
| public Field[] getDeclaredFields() { |
| return getDeclaredFields(this, false); |
| } |
| |
| /* |
| * Returns the list of fields without performing any security checks |
| * first. If no fields exist at all, an empty array is returned. |
| */ |
| static native Field[] getDeclaredFields(Class<?> c, boolean publicOnly); |
| |
| /** |
| * Returns the field if it is defined by {@code c}; null otherwise. This |
| * may return a non-public member. |
| */ |
| static native Field getDeclaredField(Class<?> c, String name); |
| |
| /** |
| * Returns a {@code Method} object which represents the method matching the |
| * given name and parameter types that is declared by the class |
| * represented by this {@code Class}. |
| * {@code (Class[]) null} is equivalent to the empty array. |
| * |
| * @throws NoSuchMethodException |
| * if the requested method can not be found. |
| * @throws NullPointerException |
| * if {@code name} is {@code null}. |
| * @see #getMethod(String, Class[]) |
| */ |
| public Method getDeclaredMethod(String name, Class<?>... parameterTypes) |
| throws NoSuchMethodException { |
| Member member = getConstructorOrMethod(name, false, false, parameterTypes); |
| if (member instanceof Constructor) { |
| throw new NoSuchMethodException(name); |
| } |
| return (Method) member; |
| } |
| |
| /** |
| * Returns an array containing {@code Method} objects for all methods |
| * declared in the class represented by this {@code Class}. If there are no |
| * methods or if this {@code Class} represents an array class, a primitive |
| * type or void then an empty array is returned. |
| * |
| * @see #getMethods() |
| */ |
| public Method[] getDeclaredMethods() { |
| return getDeclaredMethods(this, false); |
| } |
| |
| /** |
| * Returns the list of methods. If no methods exist, an empty array is returned. |
| */ |
| static native Method[] getDeclaredMethods(Class<?> c, boolean publicOnly); |
| |
| /** |
| * Returns the constructor or method if it is defined by {@code c}; null |
| * otherwise. This may return a non-public member. Use "<init>" to get a constructor. |
| */ |
| static native Member getDeclaredConstructorOrMethod(Class c, String name, Class[] args); |
| |
| /** |
| * Returns the declaring {@code Class} of this {@code Class}. Returns |
| * {@code null} if the class is not a member of another class or if this |
| * {@code Class} represents an array class, a primitive type, or void. |
| */ |
| public native Class<?> getDeclaringClass(); |
| |
| /** |
| * Returns the enclosing {@code Class} of this {@code Class}. If there is no |
| * enclosing class the method returns {@code null}. |
| */ |
| public native Class<?> getEnclosingClass(); |
| |
| /** |
| * Returns the enclosing {@code Constructor} of this {@code Class}, if it is an |
| * anonymous or local/automatic class; otherwise {@code null}. |
| */ |
| public native Constructor<?> getEnclosingConstructor(); |
| |
| /** |
| * Returns the enclosing {@code Method} of this {@code Class}, if it is an |
| * anonymous or local/automatic class; otherwise {@code null}. |
| */ |
| public native Method getEnclosingMethod(); |
| |
| /** |
| * Returns the {@code enum} constants associated with this {@code Class}. |
| * Returns {@code null} if this {@code Class} does not represent an {@code |
| * enum} type. |
| */ |
| @SuppressWarnings("unchecked") // we only cast after confirming that this class is an enum |
| public T[] getEnumConstants() { |
| if (!isEnum()) { |
| return null; |
| } |
| return (T[]) Enum.getSharedConstants((Class) this).clone(); |
| } |
| |
| /** |
| * Returns a {@code Field} object which represents the public field with the |
| * given name. This method first searches the class C represented by |
| * this {@code Class}, then the interfaces implemented by C and finally the |
| * superclasses of C. |
| * |
| * @throws NoSuchFieldException |
| * if the field can not be found. |
| * @see #getDeclaredField(String) |
| */ |
| public Field getField(String name) throws NoSuchFieldException { |
| if (name == null) { |
| throw new NullPointerException("name == null"); |
| } |
| Field result = getPublicFieldRecursive(name); |
| if (result == null) { |
| throw new NoSuchFieldException(name); |
| } |
| return result; |
| } |
| |
| private Field getPublicFieldRecursive(String name) { |
| // search superclasses |
| for (Class<?> c = this; c != null; c = c.getSuperclass()) { |
| Field result = Class.getDeclaredField(c, name); |
| if (result != null && (result.getModifiers() & Modifier.PUBLIC) != 0) { |
| return result; |
| } |
| } |
| |
| // search implemented interfaces |
| for (Class<?> c = this; c != null; c = c.getSuperclass()) { |
| for (Class<?> ifc : c.getInterfaces()) { |
| Field result = ifc.getPublicFieldRecursive(name); |
| if (result != null && (result.getModifiers() & Modifier.PUBLIC) != 0) { |
| return result; |
| } |
| } |
| } |
| |
| return null; |
| } |
| |
| /** |
| * Returns an array containing {@code Field} objects for all public fields |
| * for the class C represented by this {@code Class}. Fields may be declared |
| * in C, the interfaces it implements or in the superclasses of C. The |
| * elements in the returned array are in no particular order. |
| * |
| * <p>If there are no public fields or if this class represents an array class, |
| * a primitive type or {@code void} then an empty array is returned. |
| * |
| * @see #getDeclaredFields() |
| */ |
| public Field[] getFields() { |
| List<Field> fields = new ArrayList<Field>(); |
| getPublicFieldsRecursive(fields); |
| |
| /* |
| * The result may include duplicates when this class implements an interface |
| * through multiple paths. Remove those duplicates. |
| */ |
| CollectionUtils.removeDuplicates(fields, Field.ORDER_BY_NAME_AND_DECLARING_CLASS); |
| return fields.toArray(new Field[fields.size()]); |
| } |
| |
| /** |
| * Populates {@code result} with public fields defined by this class, its |
| * superclasses, and all implemented interfaces. |
| */ |
| private void getPublicFieldsRecursive(List<Field> result) { |
| // search superclasses |
| for (Class<?> c = this; c != null; c = c.getSuperclass()) { |
| for (Field field : Class.getDeclaredFields(c, true)) { |
| result.add(field); |
| } |
| } |
| |
| // search implemented interfaces |
| for (Class<?> c = this; c != null; c = c.getSuperclass()) { |
| for (Class<?> ifc : c.getInterfaces()) { |
| ifc.getPublicFieldsRecursive(result); |
| } |
| } |
| } |
| |
| /** |
| * Returns the {@link Type}s of the interfaces that this {@code Class} directly |
| * implements. If the {@code Class} represents a primitive type or {@code |
| * void} then an empty array is returned. |
| */ |
| public Type[] getGenericInterfaces() { |
| GenericSignatureParser parser = new GenericSignatureParser(getClassLoader()); |
| parser.parseForClass(this, getSignatureAttribute()); |
| return Types.getClonedTypeArray(parser.interfaceTypes); |
| } |
| |
| /** |
| * Returns the {@code Type} that represents the superclass of this {@code |
| * class}. |
| */ |
| public Type getGenericSuperclass() { |
| GenericSignatureParser parser = new GenericSignatureParser(getClassLoader()); |
| parser.parseForClass(this, getSignatureAttribute()); |
| return Types.getType(parser.superclassType); |
| } |
| |
| /** |
| * Returns an array of {@code Class} objects that match the interfaces |
| * in the {@code implements} declaration of the class represented |
| * by this {@code Class}. The order of the elements in the array is |
| * identical to the order in the original class declaration. If the class |
| * does not implement any interfaces, an empty array is returned. |
| */ |
| public native Class<?>[] getInterfaces(); |
| |
| /** |
| * Returns a {@code Method} object which represents the public method with |
| * the given name and parameter types. |
| * {@code (Class[]) null} is equivalent to the empty array. |
| * This method first searches the |
| * class C represented by this {@code Class}, then the superclasses of C and |
| * finally the interfaces implemented by C and finally the superclasses of C |
| * for a method with matching name. |
| * |
| * @throws NoSuchMethodException |
| * if the method can not be found. |
| * @see #getDeclaredMethod(String, Class[]) |
| */ |
| public Method getMethod(String name, Class<?>... parameterTypes) throws NoSuchMethodException { |
| Member member = getConstructorOrMethod(name, true, true, parameterTypes); |
| if (member instanceof Constructor) { |
| throw new NoSuchMethodException(name); |
| } |
| return (Method) member; |
| } |
| |
| /** |
| * Returns an array containing {@code Method} objects for all public methods |
| * for the class C represented by this {@code Class}. Methods may be |
| * declared in C, the interfaces it implements or in the superclasses of C. |
| * The elements in the returned array are in no particular order. |
| * |
| * <p>If there are no public methods or if this {@code Class} represents a |
| * primitive type or {@code void} then an empty array is returned. |
| * |
| * @see #getDeclaredMethods() |
| */ |
| public Method[] getMethods() { |
| List<Method> methods = new ArrayList<Method>(); |
| getPublicMethodsRecursive(methods); |
| |
| /* |
| * Remove methods defined by multiple types, preferring to keep methods |
| * declared by derived types. |
| */ |
| CollectionUtils.removeDuplicates(methods, Method.ORDER_BY_SIGNATURE); |
| return methods.toArray(new Method[methods.size()]); |
| } |
| |
| /** |
| * Populates {@code result} with public methods defined by this class, its |
| * superclasses, and all implemented interfaces, including overridden methods. |
| */ |
| private void getPublicMethodsRecursive(List<Method> result) { |
| // search superclasses |
| for (Class<?> c = this; c != null; c = c.getSuperclass()) { |
| for (Method method : Class.getDeclaredMethods(c, true)) { |
| result.add(method); |
| } |
| } |
| |
| // search implemented interfaces |
| for (Class<?> c = this; c != null; c = c.getSuperclass()) { |
| for (Class<?> ifc : c.getInterfaces()) { |
| ifc.getPublicMethodsRecursive(result); |
| } |
| } |
| } |
| |
| /** |
| * Returns an integer that represents the modifiers of the class represented |
| * by this {@code Class}. The returned value is a combination of bits |
| * defined by constants in the {@link Modifier} class. |
| */ |
| public int getModifiers() { |
| return getModifiers(this, false); |
| } |
| |
| /* |
| * Returns the modifiers for the given class. |
| * |
| * {@code ignoreInnerClassesAttrib} determines whether we look for and use the |
| * flags from an "inner class" attribute |
| */ |
| private static native int getModifiers(Class<?> clazz, boolean ignoreInnerClassesAttrib); |
| |
| /** |
| * Returns the name of the class represented by this {@code Class}. For a |
| * description of the format which is used, see the class definition of |
| * {@link Class}. |
| */ |
| public String getName() { |
| String result = name; |
| return (result == null) ? (name = getNameNative()) : result; |
| } |
| |
| private native String getNameNative(); |
| |
| /** |
| * Returns the simple name of the class represented by this {@code Class} as |
| * defined in the source code. If there is no name (that is, the class is |
| * anonymous) then an empty string is returned. If the receiver is an array |
| * then the name of the underlying type with square braces appended (for |
| * example {@code "Integer[]"}) is returned. |
| * |
| * @return the simple name of the class represented by this {@code Class}. |
| */ |
| public String getSimpleName() { |
| if (isArray()) { |
| return getComponentType().getSimpleName() + "[]"; |
| } |
| |
| String name = getName(); |
| |
| if (isAnonymousClass()) { |
| return ""; |
| } |
| |
| if (isMemberClass() || isLocalClass()) { |
| return getInnerClassName(); |
| } |
| |
| int dot = name.lastIndexOf('.'); |
| if (dot != -1) { |
| return name.substring(dot + 1); |
| } |
| |
| return name; |
| } |
| |
| /* |
| * Returns the simple name of a member or local class, or null otherwise. |
| */ |
| private native String getInnerClassName(); |
| |
| /** |
| * Returns null. |
| */ |
| public ProtectionDomain getProtectionDomain() { |
| return null; |
| } |
| |
| /** |
| * Returns the URL of the given resource, or null if the resource is not found. |
| * The mapping between the resource name and the URL is managed by the class' class loader. |
| * |
| * @see ClassLoader |
| */ |
| public URL getResource(String resourceName) { |
| // Get absolute resource name, but without the leading slash |
| if (resourceName.startsWith("/")) { |
| resourceName = resourceName.substring(1); |
| } else { |
| String pkg = getName(); |
| int dot = pkg.lastIndexOf('.'); |
| if (dot != -1) { |
| pkg = pkg.substring(0, dot).replace('.', '/'); |
| } else { |
| pkg = ""; |
| } |
| |
| resourceName = pkg + "/" + resourceName; |
| } |
| |
| // Delegate to proper class loader |
| ClassLoader loader = getClassLoader(); |
| if (loader != null) { |
| return loader.getResource(resourceName); |
| } else { |
| return ClassLoader.getSystemResource(resourceName); |
| } |
| } |
| |
| /** |
| * Returns a read-only stream for the contents of the given resource, or null if the resource |
| * is not found. |
| * The mapping between the resource name and the stream is managed by the class' class loader. |
| * |
| * @see ClassLoader |
| */ |
| public InputStream getResourceAsStream(String resourceName) { |
| // Get absolute resource name, but without the leading slash |
| if (resourceName.startsWith("/")) { |
| resourceName = resourceName.substring(1); |
| } else { |
| String pkg = getName(); |
| int dot = pkg.lastIndexOf('.'); |
| if (dot != -1) { |
| pkg = pkg.substring(0, dot).replace('.', '/'); |
| } else { |
| pkg = ""; |
| } |
| |
| resourceName = pkg + "/" + resourceName; |
| } |
| |
| // Delegate to proper class loader |
| ClassLoader loader = getClassLoader(); |
| if (loader != null) { |
| return loader.getResourceAsStream(resourceName); |
| } else { |
| return ClassLoader.getSystemResourceAsStream(resourceName); |
| } |
| } |
| |
| /** |
| * Returns null. (On Android, a {@code ClassLoader} can load classes from multiple dex files. |
| * All classes from any given dex file will have the same signers, but different dex |
| * files may have different signers. This does not fit well with the original |
| * {@code ClassLoader}-based model of {@code getSigners}.) |
| */ |
| public Object[] getSigners() { |
| // See http://code.google.com/p/android/issues/detail?id=1766. |
| return null; |
| } |
| |
| /** |
| * Returns the {@code Class} object which represents the superclass of the |
| * class represented by this {@code Class}. If this {@code Class} represents |
| * the {@code Object} class, a primitive type, an interface or void then the |
| * method returns {@code null}. If this {@code Class} represents an array |
| * class then the {@code Object} class is returned. |
| */ |
| public native Class<? super T> getSuperclass(); |
| |
| /** |
| * Returns an array containing {@code TypeVariable} objects for type |
| * variables declared by the generic class represented by this {@code |
| * Class}. Returns an empty array if the class is not generic. |
| */ |
| @SuppressWarnings("unchecked") |
| public synchronized TypeVariable<Class<T>>[] getTypeParameters() { |
| GenericSignatureParser parser = new GenericSignatureParser(getClassLoader()); |
| parser.parseForClass(this, getSignatureAttribute()); |
| return parser.formalTypeParameters.clone(); |
| } |
| |
| /** |
| * Tests whether this {@code Class} represents an annotation class. |
| */ |
| public boolean isAnnotation() { |
| final int ACC_ANNOTATION = 0x2000; // not public in reflect.Modifiers |
| int mod = getModifiers(this, true); |
| return (mod & ACC_ANNOTATION) != 0; |
| } |
| |
| @Override public boolean isAnnotationPresent(Class<? extends Annotation> annotationType) { |
| if (annotationType == null) { |
| throw new NullPointerException("annotationType == null"); |
| } |
| |
| if (isDeclaredAnnotationPresent(annotationType)) { |
| return true; |
| } |
| |
| if (annotationType.isDeclaredAnnotationPresent(Inherited.class)) { |
| for (Class<?> sup = getSuperclass(); sup != null; sup = sup.getSuperclass()) { |
| if (sup.isDeclaredAnnotationPresent(annotationType)) { |
| return true; |
| } |
| } |
| } |
| |
| return false; |
| } |
| |
| /** |
| * Tests whether the class represented by this {@code Class} is |
| * anonymous. |
| */ |
| native public boolean isAnonymousClass(); |
| |
| /** |
| * Tests whether the class represented by this {@code Class} is an array class. |
| */ |
| public boolean isArray() { |
| return getComponentType() != null; |
| } |
| |
| /** |
| * Tests whether the given class type can be converted to the class |
| * represented by this {@code Class}. Conversion may be done via an identity |
| * conversion or a widening reference conversion (if either the receiver or |
| * the argument represent primitive types, only the identity conversion |
| * applies). |
| * |
| * @throws NullPointerException |
| * if {@code c} is {@code null}. |
| */ |
| public native boolean isAssignableFrom(Class<?> c); |
| |
| /** |
| * Tests whether the class represented by this {@code Class} is an |
| * {@code enum}. |
| */ |
| public boolean isEnum() { |
| return ((getModifiers() & 0x4000) != 0) && (getSuperclass() == Enum.class); |
| } |
| |
| /** |
| * Tests whether the given object can be cast to the class |
| * represented by this {@code Class}. This is the runtime version of the |
| * {@code instanceof} operator. |
| * |
| * @return {@code true} if {@code object} can be cast to the type |
| * represented by this {@code Class}; {@code false} if {@code |
| * object} is {@code null} or cannot be cast. |
| */ |
| public native boolean isInstance(Object object); |
| |
| /** |
| * Tests whether this {@code Class} represents an interface. |
| */ |
| public native boolean isInterface(); |
| |
| /** |
| * Tests whether the class represented by this {@code Class} is defined |
| * locally. |
| */ |
| public boolean isLocalClass() { |
| boolean enclosed = (getEnclosingMethod() != null || |
| getEnclosingConstructor() != null); |
| return enclosed && !isAnonymousClass(); |
| } |
| |
| /** |
| * Tests whether the class represented by this {@code Class} is a member |
| * class. |
| */ |
| public boolean isMemberClass() { |
| return getDeclaringClass() != null; |
| } |
| |
| /** |
| * Tests whether this {@code Class} represents a primitive type. |
| */ |
| public native boolean isPrimitive(); |
| |
| /** |
| * Tests whether this {@code Class} represents a synthetic type. |
| */ |
| public boolean isSynthetic() { |
| final int ACC_SYNTHETIC = 0x1000; // not public in reflect.Modifiers |
| int mod = getModifiers(this, true); |
| return (mod & ACC_SYNTHETIC) != 0; |
| } |
| |
| /** |
| * Returns a new instance of the class represented by this {@code Class}, |
| * created by invoking the default (that is, zero-argument) constructor. If |
| * there is no such constructor, or if the creation fails (either because of |
| * a lack of available memory or because an exception is thrown by the |
| * constructor), an {@code InstantiationException} is thrown. If the default |
| * constructor exists but is not accessible from the context where this |
| * method is invoked, an {@code IllegalAccessException} is thrown. |
| * |
| * @throws IllegalAccessException |
| * if the default constructor is not visible. |
| * @throws InstantiationException |
| * if the instance can not be created. |
| */ |
| public T newInstance() throws InstantiationException, IllegalAccessException { |
| return newInstanceImpl(); |
| } |
| |
| private native T newInstanceImpl() throws IllegalAccessException, InstantiationException; |
| |
| @Override |
| public String toString() { |
| if (isPrimitive()) { |
| return getSimpleName(); |
| } else { |
| return (isInterface() ? "interface " : "class ") + getName(); |
| } |
| } |
| |
| /** |
| * Returns the {@code Package} of which the class represented by this |
| * {@code Class} is a member. Returns {@code null} if no {@code Package} |
| * object was created by the class loader of the class. |
| */ |
| public Package getPackage() { |
| // TODO This might be a hack, but the VM doesn't have the necessary info. |
| ClassLoader loader = getClassLoader(); |
| if (loader != null) { |
| String name = getName(); |
| int dot = name.lastIndexOf('.'); |
| return (dot != -1 ? loader.getPackage(name.substring(0, dot)) : null); |
| } |
| return null; |
| } |
| |
| /** |
| * Returns the assertion status for the class represented by this {@code |
| * Class}. Assertion is enabled / disabled based on the class loader, |
| * package or class default at runtime. |
| */ |
| public native boolean desiredAssertionStatus(); |
| |
| /** |
| * Casts this {@code Class} to represent a subclass of the given class. |
| * If successful, this {@code Class} is returned; otherwise a {@code |
| * ClassCastException} is thrown. |
| * |
| * @throws ClassCastException |
| * if this {@code Class} cannot be cast to the given type. |
| */ |
| @SuppressWarnings("unchecked") |
| public <U> Class<? extends U> asSubclass(Class<U> c) { |
| if (c.isAssignableFrom(this)) { |
| return (Class<? extends U>)this; |
| } |
| String actualClassName = this.getName(); |
| String desiredClassName = c.getName(); |
| throw new ClassCastException(actualClassName + " cannot be cast to " + desiredClassName); |
| } |
| |
| /** |
| * Casts the given object to the type represented by this {@code Class}. |
| * If the object is {@code null} then the result is also {@code null}. |
| * |
| * @throws ClassCastException |
| * if the object cannot be cast to the given type. |
| */ |
| @SuppressWarnings("unchecked") |
| public T cast(Object obj) { |
| if (obj == null) { |
| return null; |
| } else if (this.isInstance(obj)) { |
| return (T)obj; |
| } |
| String actualClassName = obj.getClass().getName(); |
| String desiredClassName = this.getName(); |
| throw new ClassCastException(actualClassName + " cannot be cast to " + desiredClassName); |
| } |
| |
| /** |
| * Copies two arrays into one. Assumes that the destination array is large |
| * enough. |
| * |
| * @param result the destination array |
| * @param head the first source array |
| * @param tail the second source array |
| * @return the destination array, that is, result |
| */ |
| private static <T extends Object> T[] arraycopy(T[] result, T[] head, T[] tail) { |
| System.arraycopy(head, 0, result, 0, head.length); |
| System.arraycopy(tail, 0, result, head.length, tail.length); |
| return result; |
| } |
| } |
