001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017
018package org.apache.commons.configuration2.spring;
019
020import java.util.ArrayList;
021import java.util.List;
022
023import org.apache.commons.configuration2.Configuration;
024import org.apache.commons.lang3.ArrayUtils;
025import org.springframework.core.env.EnumerablePropertySource;
026
027/**
028 * Allow use of Apache Commons Configuration Objects as Spring PropertySources
029 */
030public class ConfigurationPropertySource extends EnumerablePropertySource<Configuration> {
031
032    protected ConfigurationPropertySource(final String name) {
033        super(name);
034    }
035
036    public ConfigurationPropertySource(final String name, final Configuration source) {
037        super(name, source);
038    }
039
040    @Override
041    public Object getProperty(final String name) {
042        if (source.getProperty(name) != null) {
043            final String[] propValue = source.getStringArray(name);
044            if (propValue == null || propValue.length == 0) {
045                return "";
046            } else if (propValue.length == 1) {
047                return propValue[0];
048            } else {
049                return propValue;
050            }
051        } else {
052            return null;
053        }
054    }
055
056    @Override
057    public String[] getPropertyNames() {
058        final List<String> keys = new ArrayList<>();
059        source.getKeys().forEachRemaining(keys::add);
060        return keys.toArray(ArrayUtils.EMPTY_STRING_ARRAY);
061    }
062}