org.apache.whirr.karaf.command.support.ConfigurationReader.java Source code

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Here is the source code for org.apache.whirr.karaf.command.support.ConfigurationReader.java

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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 org.apache.whirr.karaf.command.support;

import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.osgi.service.cm.Configuration;
import org.osgi.service.cm.ConfigurationAdmin;

import java.io.IOException;
import java.util.Arrays;
import java.util.Dictionary;
import java.util.Enumeration;
import java.util.List;

public class ConfigurationReader {

    public static final String WHIRR_IDENTIY = "whirr.identity";
    public static final String WHIRR_CREDENTIAL = "whirr.credential";
    public static final String WHIRR_PROVIDER = "whirr.provider";
    public static final String WHIRR_CLUSTER_NAME = "whirr.cluster-name";
    public static final String DEFAULT_CLUSTER_NAME = "default";

    private ConfigurationReader() {
        //Utility Class
    }

    /**
     * Builds Configuration from a File.
     *
     * @param fileName
     * @return
     * @throws org.apache.commons.configuration.ConfigurationException
     *
     */
    public static PropertiesConfiguration fromFile(String fileName) {
        PropertiesConfiguration config = null;
        try {
            config = new PropertiesConfiguration(fileName);
        } catch (ConfigurationException e) {
            System.err.println(
                    String.format("Failed to read configuration from file:%s.%s.", fileName, e.getMessage()));
        }
        return config;
    }

    /**
     * Builds the Configuration from Configuration Admin.
     *
     * @param pid
     * @return
     */
    public static PropertiesConfiguration fromConfigAdmin(ConfigurationAdmin configurationAdmin, String pid) {
        List<String> ignoredKeys = Arrays.asList("service.pid", "felix.fileinstall.filename");
        PropertiesConfiguration propertiesConfiguration = new PropertiesConfiguration();
        try {
            Configuration configuration = configurationAdmin.getConfiguration(pid);
            Dictionary properties = configuration.getProperties();
            Enumeration keys = properties.keys();
            while (keys.hasMoreElements()) {
                Object key = keys.nextElement();
                Object value = properties.get(key);
                if (!ignoredKeys.contains(key)) {
                    propertiesConfiguration.addProperty(String.valueOf(key), value);
                }
            }
        } catch (IOException e) {
            System.err.println(String.format("No configuration found for pid:%s.", pid));
            return null;
        }
        return propertiesConfiguration;
    }
}