| /* |
| * 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) 2008 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.lang.annotation.Annotation; |
| import java.lang.reflect.AnnotatedElement; |
| import java.net.URL; |
| |
| /** |
| * Contains information about a Java package. This includes implementation and |
| * specification versions. Typically this information is retrieved from the |
| * manifest. |
| * <p> |
| * Packages are managed by class loaders. All classes loaded by the same loader |
| * from the same package share a {@code Package} instance. |
| * </p> |
| * |
| * @see java.lang.ClassLoader |
| */ |
| public class Package implements AnnotatedElement { |
| private static final Annotation[] NO_ANNOTATIONS = new Annotation[0]; |
| |
| private final String name; |
| private final String specTitle; |
| private final String specVersion; |
| private final String specVendor; |
| private final String implTitle; |
| private final String implVersion; |
| private final String implVendor; |
| private final URL sealBase; |
| |
| Package(String name, String specTitle, String specVersion, String specVendor, |
| String implTitle, String implVersion, String implVendor, URL sealBase) { |
| this.name = name; |
| this.specTitle = specTitle; |
| this.specVersion = specVersion; |
| this.specVendor = specVendor; |
| this.implTitle = implTitle; |
| this.implVersion = implVersion; |
| this.implVendor = implVendor; |
| this.sealBase = sealBase; |
| } |
| |
| /** |
| * Gets the annotation associated with the specified annotation type and |
| * this package, if present. |
| * |
| * @param annotationType |
| * the annotation type to look for. |
| * @return an instance of {@link Annotation} or {@code null}. |
| * @see java.lang.reflect.AnnotatedElement#getAnnotation(java.lang.Class) |
| */ |
| @SuppressWarnings("unchecked") |
| public <A extends Annotation> A getAnnotation(Class<A> annotationType) { |
| for (Annotation annotation : getAnnotations()) { |
| if (annotationType.isInstance(annotation)) { |
| return (A) annotation; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Returns an empty array. Package annotations are not supported on Android. |
| */ |
| public Annotation[] getAnnotations() { |
| return NO_ANNOTATIONS; |
| } |
| |
| /** |
| * Returns an empty array. Package annotations are not supported on Android. |
| */ |
| public Annotation[] getDeclaredAnnotations() { |
| return NO_ANNOTATIONS; |
| } |
| |
| /** |
| * Indicates whether the specified annotation is present. |
| * |
| * @param annotationType |
| * the annotation type to look for. |
| * @return {@code true} if the annotation is present; {@code false} |
| * otherwise. |
| * @see java.lang.reflect.AnnotatedElement#isAnnotationPresent(java.lang.Class) |
| */ |
| public boolean isAnnotationPresent(Class<? extends Annotation> annotationType) { |
| return getAnnotation(annotationType) != null; |
| } |
| |
| /** |
| * Returns the title of the implementation of this package, or {@code null} |
| * if this is unknown. The format of this string is unspecified. |
| * |
| * @return the implementation title, may be {@code null}. |
| */ |
| public String getImplementationTitle() { |
| return implTitle; |
| } |
| |
| /** |
| * Returns the name of the vendor or organization that provides this |
| * implementation of the package, or {@code null} if this is unknown. The |
| * format of this string is unspecified. |
| * |
| * @return the implementation vendor name, may be {@code null}. |
| */ |
| public String getImplementationVendor() { |
| return implVendor; |
| } |
| |
| /** |
| * Returns the version of the implementation of this package, or {@code |
| * null} if this is unknown. The format of this string is unspecified. |
| * |
| * @return the implementation version, may be {@code null}. |
| */ |
| public String getImplementationVersion() { |
| return implVersion; |
| } |
| |
| /** |
| * Returns the name of this package in the standard dot notation; for |
| * example: "java.lang". |
| * |
| * @return the name of this package. |
| */ |
| public String getName() { |
| return name; |
| } |
| |
| /** |
| * Attempts to locate the requested package in the caller's class loader. If |
| * no package information can be located, {@code null} is returned. |
| * |
| * @param packageName |
| * the name of the package to find. |
| * @return the requested package, or {@code null}. |
| * @see ClassLoader#getPackage(java.lang.String) |
| */ |
| public static Package getPackage(String packageName) { |
| ClassLoader classloader = VMStack.getCallingClassLoader(); |
| if (classloader == null) { |
| classloader = ClassLoader.getSystemClassLoader(); |
| } |
| return classloader.getPackage(packageName); |
| } |
| |
| /** |
| * Returns all the packages known to the caller's class loader. |
| * |
| * @return all the packages known to the caller's class loader. |
| * @see ClassLoader#getPackages |
| */ |
| public static Package[] getPackages() { |
| ClassLoader classloader = VMStack.getCallingClassLoader(); |
| if (classloader == null) { |
| classloader = ClassLoader.getSystemClassLoader(); |
| } |
| return classloader.getPackages(); |
| } |
| |
| /** |
| * Returns the title of the specification this package implements, or |
| * {@code null} if this is unknown. |
| * |
| * @return the specification title, may be {@code null}. |
| */ |
| public String getSpecificationTitle() { |
| return specTitle; |
| } |
| |
| /** |
| * Returns the name of the vendor or organization that owns and maintains |
| * the specification this package implements, or {@code null} if this is |
| * unknown. |
| * |
| * @return the specification vendor name, may be {@code null}. |
| */ |
| public String getSpecificationVendor() { |
| return specVendor; |
| } |
| |
| /** |
| * Returns the version of the specification this package implements, or |
| * {@code null} if this is unknown. The version string is a sequence of |
| * non-negative integers separated by dots; for example: "1.2.3". |
| * |
| * @return the specification version string, may be {@code null}. |
| */ |
| public String getSpecificationVersion() { |
| return specVersion; |
| } |
| |
| @Override |
| public int hashCode() { |
| return name.hashCode(); |
| } |
| |
| /** |
| * Indicates whether this package's specification version is compatible with |
| * the specified version string. Version strings are compared by comparing |
| * each dot separated part of the version as an integer. |
| * |
| * @param version |
| * the version string to compare against. |
| * @return {@code true} if the package versions are compatible; {@code |
| * false} otherwise. |
| * @throws NumberFormatException |
| * if this package's version string or the one provided are not |
| * in the correct format. |
| */ |
| public boolean isCompatibleWith(String version) throws NumberFormatException { |
| String[] requested = version.split("\\."); |
| String[] provided = specVersion.split("\\."); |
| |
| for (int i = 0; i < Math.min(requested.length, provided.length); i++) { |
| int reqNum = Integer.parseInt(requested[i]); |
| int provNum = Integer.parseInt(provided[i]); |
| |
| if (reqNum > provNum) { |
| return false; |
| } else if (reqNum < provNum) { |
| return true; |
| } |
| } |
| |
| if (requested.length > provided.length) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| /** |
| * Indicates whether this package is sealed. |
| * |
| * @return {@code true} if this package is sealed; {@code false} otherwise. |
| */ |
| public boolean isSealed() { |
| return sealBase != null; |
| } |
| |
| /** |
| * Indicates whether this package is sealed with respect to the specified |
| * URL. |
| * |
| * @param url |
| * the URL to check. |
| * @return {@code true} if this package is sealed with {@code url}; {@code |
| * false} otherwise |
| */ |
| public boolean isSealed(URL url) { |
| return sealBase != null && sealBase.sameFile(url); |
| } |
| |
| @Override |
| public String toString() { |
| return "package " + name; |
| } |
| } |