io.github.jonestimd.util.Resources Maven / Gradle / Ivy
// The MIT License (MIT)
//
// Copyright (c) 2017 Timothy D. Jones
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package io.github.jonestimd.util;
import java.util.Enumeration;
import java.util.Map;
import java.util.ResourceBundle;
import java.util.TreeMap;
import java.util.function.Function;
/**
* Utility methods for accessing resource bundles.
*/
public class Resources {
private Resources() {}
/**
* Get a subset of resources as a {@link Map}.
*/
public static Map asMap(ResourceBundle bundle, String keyPrefix, Function converter) {
Enumeration keys = bundle.getKeys();
int length = keyPrefix.length();
Map resources = new TreeMap<>();
while (keys.hasMoreElements()) {
String key = keys.nextElement();
if (key.startsWith(keyPrefix)) resources.put(key.substring(length), converter.apply(bundle.getObject(key)));
}
return resources;
}
/**
* Combine a subset of resources into a string. The resources are converted to strings using {@code toString()}
* and concatenated in the alphabetical order of their keys.
*/
public static String join(ResourceBundle bundle, String prefix) {
Map map = asMap(bundle, prefix, Object::toString);
StringBuilder buffer = new StringBuilder();
map.values().forEach(buffer::append);
return buffer.toString();
}
}