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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;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
/**
* {@code PropertyResourceBundle} loads resources from an {@code InputStream}. All resources are
* Strings. The resources must be of the form {@code key=value}, one
* resource per line (see Properties).
*
* @see ResourceBundle
* @see Properties
* @since 1.1
*/
public class PropertyResourceBundle extends ResourceBundle {
Properties resources;
/**
* Constructs a new instance of {@code PropertyResourceBundle} and loads the
* properties file from the specified {@code InputStream}.
*
* @param stream
* the {@code InputStream}.
* @throws IOException
* if an error occurs during a read operation on the
* {@code InputStream}.
*/
public PropertyResourceBundle(InputStream stream) throws IOException {
if (stream == null) {
throw new NullPointerException("stream == null");
}
resources = new Properties();
resources.load(stream);
}
/**
* Constructs a new resource bundle with properties read from {@code reader}.
*
* @param reader the {@code Reader}
* @throws IOException
* @since 1.6
*/
public PropertyResourceBundle(Reader reader) throws IOException {
resources = new Properties();
resources.load(reader);
}
protected Set<String> handleKeySet(){
return resources.stringPropertyNames();
}
@SuppressWarnings("unchecked")
private Enumeration<String> getLocalKeys() {
return (Enumeration<String>) resources.propertyNames();
}
@Override
public Enumeration<String> getKeys() {
if (parent == null) {
return getLocalKeys();
}
return new Enumeration<String>() {
Enumeration<String> local = getLocalKeys();
Enumeration<String> pEnum = parent.getKeys();
String nextElement;
private boolean findNext() {
if (nextElement != null) {
return true;
}
while (pEnum.hasMoreElements()) {
String next = pEnum.nextElement();
if (!resources.containsKey(next)) {
nextElement = next;
return true;
}
}
return false;
}
public boolean hasMoreElements() {
if (local.hasMoreElements()) {
return true;
}
return findNext();
}
public String nextElement() {
if (local.hasMoreElements()) {
return local.nextElement();
}
if (findNext()) {
String result = nextElement;
nextElement = null;
return result;
}
// Cause an exception
return pEnum.nextElement();
}
};
}
@Override
public Object handleGetObject(String key) {
return resources.get(key);
}
}
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