Java Jar Usage allocateReadOnlyDictionary(final Attributes attributes)

Description

allocate Read Only Dictionary

License

Apache License

Declaration

public static Dictionary allocateReadOnlyDictionary(final Attributes attributes) 

Method Source Code

//package com.java2s;
/**//from   ww  w . ja va  2 s. c  o m
 *
 * Copyright 2008-2009 (C) The original author or authors
 *
 * 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.
 */

import java.util.Collections;
import java.util.Dictionary;
import java.util.Enumeration;

import java.util.HashSet;

import java.util.Set;
import java.util.jar.Attributes;

public class Main {
    public static Dictionary allocateReadOnlyDictionary(final Attributes attributes) {
        return new Dictionary() {
            public int size() {
                return attributes.size();
            }

            public boolean isEmpty() {
                return attributes.isEmpty();
            }

            public Enumeration keys() {
                Set<String> set = new HashSet<String>();
                for (Object key : attributes.keySet())
                    set.add(key.toString());
                return Collections.enumeration(set);
            }

            public Enumeration elements() {
                return Collections.enumeration(attributes.values());
            }

            public Object get(Object key) {
                return attributes.getValue((String) key);
            }

            public Object put(Object key, Object value) {
                throw new UnsupportedOperationException("Read-only dictionary");
            }

            public Object remove(Object key) {
                throw new UnsupportedOperationException("Read-only dictionary");
            }
        };
    }
}

Related

1. _getPacker()
2. allocateReadOnlyI18nDictionary(final Attributes attributes, final ResourceBundle resourceBundle)
3. checkJarValidity(String path)
4. containsClass(JarFile jarFile, String agentRunnerClassName)
5. containsClass(JarFile jarFile, String classFilePath)