com.symantec.cpe.config.ConfigHelper.java Source code

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Here is the source code for com.symantec.cpe.config.ConfigHelper.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 com.symantec.cpe.config;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;

import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;

import backtype.storm.Config;

public class ConfigHelper {

    /** The Constant LOG. */
    private static final Logger LOG = Logger.getLogger(ConfigHelper.class);

    /*
     * A HashMap containing configurations property names and their corresponding
     * data types
     */
    /** The Constant keyTypeMap. */
    @SuppressWarnings("rawtypes")
    private static final Map<String, Class> keyTypeMap = new HashMap<String, Class>();

    /**
     * Load config: open to user, call a private function loadConfigFromFile.
     */
    public static Config loadConfig(String propertiesFileName) {
        try {
            return loadConfigFromFile(propertiesFileName);
        } catch (Exception e) {
            LOG.error("Failed while loading properties from file " + propertiesFileName, e);
            return null;
        }

    }

    /**
     * Load config from file: implement the function loadConfig, blind to users.
     */
    /**
     * Load config from file: implement the function loadConfig, blind to users.
     */
    private static Config loadConfigFromFile(String propertiesFileName) throws IOException {

        Config conf = new Config();

        try {
            // Load configs from properties file
            LOG.debug("Loading properties from " + propertiesFileName);
            InputStream fileInputStream = new FileInputStream(propertiesFileName);
            Properties properties = new Properties();
            try {
                properties.load(fileInputStream);
            } finally {
                fileInputStream.close();
            }

            for (@SuppressWarnings("rawtypes")
            Map.Entry me : properties.entrySet()) {
                try {
                    // Check every property and covert to appropriate data type before
                    // adding it to storm config. If no data type defined keep it as string
                    if (keyTypeMap.containsKey(me.getKey().toString())) {
                        if (Number.class.equals(keyTypeMap.get(me.getKey().toString()))) {
                            conf.put((String) me.getKey(), Long.valueOf(((String) me.getValue()).trim()));
                        } else if (Map.class.equals(keyTypeMap.get(me.getKey().toString()))) {
                            if (me.getValue() != null) {
                                Map<String, Object> map = new HashMap<String, Object>();
                                String kvPairs[] = StringUtils.split(me.getValue().toString(),
                                        properties.getProperty("map.kv.pair.separator", ","));
                                for (String kvPair : kvPairs) {
                                    String kv[] = StringUtils.split(kvPair,
                                            properties.getProperty("map.kv.separator", "="));
                                    map.put((String) kv[0], kv[1].trim());
                                }
                                conf.put((String) me.getKey(), map);
                            }
                        } else if (Boolean.class.equals(keyTypeMap.get((String) me.getKey()))) {
                            conf.put((String) me.getKey(), Boolean.valueOf(((String) me.getValue()).trim()));
                        }
                    } else {
                        conf.put(me.getKey().toString(), me.getValue());
                    }
                } catch (NumberFormatException nfe) {
                    LOG.error("Failed while loading properties from file " + propertiesFileName + ". The value '"
                            + me.getValue() + "' for property " + me.getKey() + " is expected to be numeric", nfe);
                    throw nfe;
                }
            }
        } catch (IOException ioe) {
            LOG.error("Failed while loading properties from file " + propertiesFileName, ioe);
            throw ioe;
        }
        return conf;
    }

}