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A library jar that provides APIs for Applications written for the Google Android Platform.

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/*
 * 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.
 */

package java.util.jar;

import java.util.Collection;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.Set;

/**
 * The {@code Attributes} class is used to store values for manifest entries.
 * Attribute keys are generally instances of {@code Attributes.Name}. Values
 * associated with attribute keys are of type {@code String}.
 */
public class Attributes implements Cloneable, Map {

    /**
     * The {@code Attributes} as name/value pairs. Maps the attribute names (as
     * {@link Attributes.Name}) of a JAR file manifest to arbitrary values. The
     * attribute names thus are obtained from the {@link Manifest} for
     * convenience.
     */
    protected Map map;

    /**
     * The name part of the name/value pairs constituting an attribute as
     * defined by the specification of the JAR manifest. May be composed of the
     * following ASCII signs as defined in the EBNF below:
     *
     * 
     * name       = alphanum *headerchar
     * headerchar = alphanum | - | _
     * alphanum   = {A-Z} | {a-z} | {0-9}
     * 
*/ public static class Name { /** The class path (a main attribute). */ public static final Name CLASS_PATH = new Name("Class-Path"); /** The version of the manifest file (a main attribute). */ public static final Name MANIFEST_VERSION = new Name("Manifest-Version"); /** The main class's name (for stand-alone applications). */ public static final Name MAIN_CLASS = new Name("Main-Class"); /** Defines the signature version of the JAR file. */ public static final Name SIGNATURE_VERSION = new Name("Signature-Version"); /** The {@code Content-Type} manifest attribute. */ public static final Name CONTENT_TYPE = new Name("Content-Type"); /** * The {@code Sealed} manifest attribute which may have the value * {@code true} for sealed archives. */ public static final Name SEALED = new Name("Sealed"); /** * The {@code Implementation-Title} attribute whose value is a string * that defines the title of the extension implementation. */ public static final Name IMPLEMENTATION_TITLE = new Name("Implementation-Title"); /** * The {@code Implementation-Version} attribute defining the version of * the extension implementation. */ public static final Name IMPLEMENTATION_VERSION = new Name("Implementation-Version"); /** * The {@code Implementation-Vendor} attribute defining the organization * that maintains the extension implementation. */ public static final Name IMPLEMENTATION_VENDOR = new Name("Implementation-Vendor"); /** * The {@code Specification-Title} attribute defining the title of the * extension specification. */ public static final Name SPECIFICATION_TITLE = new Name("Specification-Title"); /** * The {@code Specification-Version} attribute defining the version of * the extension specification. */ public static final Name SPECIFICATION_VERSION = new Name("Specification-Version"); /** * The {@code Specification-Vendor} attribute defining the organization * that maintains the extension specification. */ public static final Name SPECIFICATION_VENDOR = new Name("Specification-Vendor"); /** * The {@code Extension-List} attribute defining the extensions that are * needed by the applet. */ public static final Name EXTENSION_LIST = new Name("Extension-List"); /** * The {@code Extension-Name} attribute which defines the unique name of * the extension. */ public static final Name EXTENSION_NAME = new Name("Extension-Name"); /** * The {@code Extension-Installation} attribute. */ public static final Name EXTENSION_INSTALLATION = new Name("Extension-Installation"); /** * The {@code Implementation-Vendor-Id} attribute specifies the vendor * of an extension implementation if the applet requires an * implementation from a specific vendor. */ public static final Name IMPLEMENTATION_VENDOR_ID = new Name("Implementation-Vendor-Id"); /** * The {@code Implementation-URL} attribute specifying a URL that can be * used to obtain the most recent version of the extension if the * required version is not already installed. */ public static final Name IMPLEMENTATION_URL = new Name("Implementation-URL"); /** * @hide */ public static final Name NAME = new Name("Name"); private final String name; public Name(String name) { // encoded name + "\r\n" must be <= 72 bytes; ASCII-only so byte count equals char count if (name.isEmpty() || name.length() > Manifest.LINE_LENGTH_LIMIT - 2) { throw new IllegalArgumentException(name); } for (int i = 0; i < name.length(); i++) { char ch = name.charAt(i); if (!((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') || ch == '_' || ch == '-' || (ch >= '0' && ch <= '9'))) { throw new IllegalArgumentException(name); } } this.name = name; } String getName() { return name; } @Override public boolean equals(Object object) { return object instanceof Name && ((Name) object).name.equalsIgnoreCase(name); } @Override public int hashCode() { return name.toLowerCase(Locale.US).hashCode(); } @Override public String toString() { return name; } } /** * Constructs an {@code Attributes} instance. */ public Attributes() { map = new HashMap(); } /** * Constructs an {@code Attributes} instance obtaining keys and values from * the parameter {@code attrib}. * * @param attrib * The attributes to obtain entries from. */ @SuppressWarnings("unchecked") public Attributes(Attributes attrib) { map = (Map) ((HashMap) attrib.map).clone(); } /** * Constructs an {@code Attributes} instance with initial capacity of size * {@code size}. * * @param size * Initial size of this {@code Attributes} instance. */ public Attributes(int size) { map = new HashMap(size); } /** * Removes all key/value pairs from this {@code Attributes}. */ public void clear() { map.clear(); } /** * Determines whether this {@code Attributes} contains the specified key. * * @param key * The key to search for. * @return {@code true} if the key is found, {@code false} otherwise. */ public boolean containsKey(Object key) { return map.containsKey(key); } /** * Determines whether this {@code Attributes} contains the specified value. * * @param value * the value to search for. * @return {@code true} if the value is found, {@code false} otherwise. */ public boolean containsValue(Object value) { return map.containsValue(value); } /** * Returns a set containing map entries for each of the key/value pair * contained in this {@code Attributes}. * * @return a set of Map.Entry's */ public Set> entrySet() { return map.entrySet(); } /** * Returns the value associated with the parameter key. * * @param key * the key to search for. * @return Object associated with key, or {@code null} if key does not * exist. */ public Object get(Object key) { return map.get(key); } /** * Determines whether this {@code Attributes} contains any keys. * * @return {@code true} if one or more keys exist, {@code false} otherwise. */ public boolean isEmpty() { return map.isEmpty(); } /** * Returns a {@code Set} containing all the keys found in this {@code * Attributes}. * * @return a {@code Set} of all keys. */ public Set keySet() { return map.keySet(); } /** * Stores key/value pairs in this {@code Attributes}. * * @param key * the key to associate with value. * @param value * the value to store in this {@code Attributes}. * @return the value being stored. * @throws ClassCastException * when key is not an {@code Attributes.Name} or value is not * a {@code String}. */ @SuppressWarnings("cast") // Require cast to force ClassCastException public Object put(Object key, Object value) { return map.put((Name) key, (String) value); } /** * Stores all the key/value pairs in the argument in this {@code * Attributes}. * * @param attrib * the associations to store (must be of type {@code * Attributes}). */ public void putAll(Map attrib) { if (attrib == null) { throw new NullPointerException("attrib == null"); } if (!(attrib instanceof Attributes)) { throw new ClassCastException(attrib.getClass().getName() + " not an Attributes"); } this.map.putAll(attrib); } /** * Deletes the key/value pair with key {@code key} from this {@code * Attributes}. * * @param key * the key to remove. * @return the values associated with the removed key, {@code null} if not * present. */ public Object remove(Object key) { return map.remove(key); } /** * Returns the number of key/value pairs associated with this {@code * Attributes}. * * @return the size of this {@code Attributes}. */ public int size() { return map.size(); } /** * Returns a collection of all the values present in this {@code * Attributes}. * * @return a collection of all values present. */ public Collection values() { return map.values(); } @SuppressWarnings("unchecked") @Override public Object clone() { Attributes clone; try { clone = (Attributes) super.clone(); } catch (CloneNotSupportedException e) { throw new AssertionError(e); } clone.map = (Map) ((HashMap) map).clone(); return clone; } /** * Returns the hash code of this {@code Attributes}. * * @return the hash code of this object. */ @Override public int hashCode() { return map.hashCode(); } /** * Determines if this {@code Attributes} and the parameter {@code * Attributes} are equal. Two {@code Attributes} instances are equal if they * contain the same keys and values. * * @param obj * the object with which this {@code Attributes} is compared. * @return {@code true} if the {@code Attributes} are equal, {@code false} * otherwise. */ @Override public boolean equals(Object obj) { if (this == obj) { return true; } if (obj instanceof Attributes) { return map.equals(((Attributes) obj).map); } return false; } /** * Returns the value associated with the parameter {@code Attributes.Name} * key. * * @param name * the key to obtain the value for. * @return the {@code String} associated with name, or {@code null} if name * is not a valid key. */ public String getValue(Attributes.Name name) { return (String) map.get(name); } /** * Returns the string associated with the parameter name. * * @param name * the key to obtain the value for. * @return the string associated with name, or {@code null} if name is not a * valid key. */ public String getValue(String name) { return getValue(new Attributes.Name(name)); } /** * Stores the value {@code value} associated with the key {@code name} in this * {@code Attributes}. * * @return the value being stored. */ public String putValue(String name, String value) { return (String) map.put(new Attributes.Name(name), value); } }