/**
* 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 org.apache.isis.core.commons.lang;
import java.util.Properties;
import com.google.common.base.Joiner;
public class PropertiesExtensions {
private PropertiesExtensions(){}
public static Properties subset(Properties extendee, String... prefix) {
final String prefices = Joiner.on(".").join(prefix);
return subsetOf(extendee, prefices+".");
}
private static Properties subsetOf(Properties extendee, String prefix) {
final int prefixLength = prefix.length();
final Properties subsetProperties = new Properties();
for(Object keyObj: extendee.keySet()) {
final String key = (String)keyObj;
if (key.startsWith(prefix)) {
final String keySuffix = key.substring(prefixLength);
subsetProperties.put(keySuffix, extendee.get(key));
}
}
return subsetProperties;
}
}