java.util.ListResourceBundle Maven / Gradle / Ivy
/*
* 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;
/**
* {@code ListResourceBundle} is the abstract superclass of classes which provide
* resources by implementing the {@code getContents()} method to return
* the list of resources.
*
* @see ResourceBundle
* @since 1.1
*/
public abstract class ListResourceBundle extends ResourceBundle {
HashMap table;
/**
* Constructs a new instance of this class.
*/
public ListResourceBundle() {
}
/**
* Returns an {@code Object} array containing the resources of this
* {@code ListResourceBundle}. Each element in the array is an array of two
* elements, the first is the resource key string and the second is the
* resource.
*
* @return a {@code Object} array containing the resources.
*/
protected abstract Object[][] getContents();
@Override
public Enumeration getKeys() {
initializeTable();
if (parent != null) {
return new Enumeration() {
Iterator local = table.keySet().iterator();
Enumeration pEnum = parent.getKeys();
String nextElement;
private boolean findNext() {
if (nextElement != null) {
return true;
}
while (pEnum.hasMoreElements()) {
String next = pEnum.nextElement();
if (!table.containsKey(next)) {
nextElement = next;
return true;
}
}
return false;
}
public boolean hasMoreElements() {
if (local.hasNext()) {
return true;
}
return findNext();
}
public String nextElement() {
if (local.hasNext()) {
return local.next();
}
if (findNext()) {
String result = nextElement;
nextElement = null;
return result;
}
// Cause an exception
return pEnum.nextElement();
}
};
} else {
return new Enumeration() {
Iterator it = table.keySet().iterator();
public boolean hasMoreElements() {
return it.hasNext();
}
public String nextElement() {
return it.next();
}
};
}
}
@Override
public final Object handleGetObject(String key) {
initializeTable();
if (key == null) {
throw new NullPointerException("key == null");
}
return table.get(key);
}
private synchronized void initializeTable() {
if (table == null) {
Object[][] contents = getContents();
table = new HashMap(contents.length / 3 * 4 + 3);
for (Object[] content : contents) {
if (content[0] == null || content[1] == null) {
throw new NullPointerException("null entry");
}
table.put((String) content[0], content[1]);
}
}
}
/**
* Returns a set of the keys in this ResourceBundle but not in its parents.
*
* @return a set of the keys in this ResourceBundle but not in its parents.
* @since 1.6
*/
protected Set handleKeySet() {
initializeTable();
return table.keySet();
}
}