Utils.java

/**
 * 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.alibaba.jstorm.utils;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;

import org.apache.commons.lang.StringUtils;
import org.yaml.snakeyaml.Yaml;

import backtype.storm.Config;



public class Utils {
    public static Map LoadProperty(String prop) {
        Properties properties = new Properties();
        Map conf = new HashMap();
        try {
            InputStream stream = new FileInputStream(prop);
            properties.load(stream);
            conf.putAll(properties);
            return conf;
        } catch (FileNotFoundException e) {
            System.out.println("No such file " + prop);
            return conf;
        } catch (Exception e1) {
            e1.printStackTrace();
            
            return conf;
        }
        
        
    }
    
    public static Map LoadYaml(String confPath) {
        Map conf = new HashMap();
        
        Yaml yaml = new Yaml();
        
        try {
            InputStream stream = new FileInputStream(confPath);
            
            conf = (Map) yaml.load(stream);
            if (conf == null || conf.isEmpty() == true) {
                throw new RuntimeException("Failed to read config file");
            }
            
        } catch (FileNotFoundException e) {
            System.out.println("No such file " + confPath);
            throw new RuntimeException("No config file");
        } catch (Exception e1) {
            e1.printStackTrace();
            throw new RuntimeException("Failed to read config file");
        }
        
        return conf;
    }
    
    public static Map LoadConf(String arg) {
        if (arg.endsWith("yaml")) {
            return LoadYaml(arg);
        } else {
            return LoadProperty(arg);
        }
    }
    
    public static Config getConfig(String[] args) {
        Config ret = new Config();
        if (args == null || args.length == 0) {
            return ret;
        }
        
        if (StringUtils.isBlank(args[0])) {
            return ret;
        }
        
        Map conf = LoadConf(args[0]);
        ret.putAll(conf);
        return ret;
    }
    
    
    public static String getErrorInfo(Throwable error) {
        try {
            StringWriter sw = new StringWriter();
            PrintWriter pw = new PrintWriter(sw);
            error.printStackTrace(pw);
            return sw.toString();
        } catch (Exception e1) {
            return "";
        }
    }
    
    public static Integer getInt(Object o) {
        Integer result = getInt(o, null);
        if (null == result) {
            throw new IllegalArgumentException("Don't know how to convert null to int");
        }
        return result;
    }
    
    public static Integer getInt(Object o, Integer defaultValue) {
        if (null == o) {
            return defaultValue;
        }

        if (o instanceof Integer ||
                o instanceof Short ||
                o instanceof Byte) {
            return ((Number) o).intValue();
        } else if (o instanceof Long) {
            final long l = (Long) o;
            if (Integer.MIN_VALUE <= l && l <= Integer.MAX_VALUE) {
                return (int) l;
            }
        } else if (o instanceof Double) {
            final double d = (Double) o;
            if (Integer.MIN_VALUE <= d && d <= Integer.MAX_VALUE) {
                return (int) d;
            }
        } else if (o instanceof String) {
            return Integer.parseInt((String) o);
        }

        //
        return defaultValue;
    }
    
    public static boolean getBoolean(Object o, boolean defaultValue) {
        if (null == o) {
            return defaultValue;
        }
        if (o instanceof Boolean) {
            return (Boolean) o;
        } else {
            throw new IllegalArgumentException("Don't know how to convert " + o + " + to boolean");
        }
    }
}