    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    /**
    033     * Constructs a new instance.
    034     *
    035     * @param name the associated name.
    036     */
    037    protected ConfigurationPropertySource(final String name) {
    038        super(name);
    039    }
    040
    041    /**
    042     * Constructs a new instance.
    043     *
    044     * @param name   the associated name.
    045     * @param source the source object.
    046     */
    047    public ConfigurationPropertySource(final String name, final Configuration source) {
    048        super(name, source);
    049    }
    050
    051    @Override
    052    public Object getProperty(final String name) {
    053        if (source.getProperty(name) == null) {
    054            return null;
    055        }
    056        final String[] propValue = source.getStringArray(name);
    057        if (propValue == null || propValue.length == 0) {
    058            return "";
    059        }
    060        if (propValue.length == 1) {
    061            return propValue[0];
    062        }
    063        return propValue;
    064    }
    065
    066    @Override
    067    public String[] getPropertyNames() {
    068        final List<String> keys = new ArrayList<>();
    069        source.getKeys().forEachRemaining(keys::add);
    070        return keys.toArray(ArrayUtils.EMPTY_STRING_ARRAY);
    071    }
    072}