net.ymate.platform.commons.util.SystemEnvUtils.java Source code

Introduction

Here is the source code for net.ymate.platform.commons.util.SystemEnvUtils.java

Source

/*
 * Copyright 2007-2107 the original author or authors.
 *
 * Licensed 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 net.ymate.platform.commons.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.SystemUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * <p>
 * SystemEnvUtils
 * </p>
 * <p>
 * ??
 * </p>
 * 
 * @author (suninformation@163.com)
 * @version 0.0.0
 *          <table style="border:1px solid gray;">
 *          <tr>
 *          <th width="100px">?</th><th width="100px"></th><th
 *          width="100px"></th><th width="100px"></th>
 *          </tr>
 *          <!--  Table ?? -->
 *          <tr>
 *          <td>0.0.0</td>
 *          <td></td>
 *          <td></td>
 *          <td>2010-8-2?10:11:43</td>
 *          </tr>
 *          </table>
 */
public class SystemEnvUtils {

    private static final Log _LOG = LogFactory.getLog(SystemEnvUtils.class);

    /**
     * ??
     */
    private static final Map<String, String> SYSTEM_ENV_MAP = new HashMap<String, String>();

    static {
        initSystemEnvs();
    }

    /**
     * ? 
     */
    private SystemEnvUtils() {
    }

    /**
     * ?????
     */
    public static void initSystemEnvs() {
        Process p = null;
        try {
            if (SystemUtils.IS_OS_WINDOWS) {
                p = Runtime.getRuntime().exec("cmd /c set");
            } else if (SystemUtils.IS_OS_UNIX) {
                p = Runtime.getRuntime().exec("/bin/sh -c set");
            } else {
                _LOG.warn("Unknown os.name=" + SystemUtils.OS_NAME);
                SYSTEM_ENV_MAP.clear();
            }
            if (p != null) {
                BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));
                String line;
                while ((line = br.readLine()) != null) {
                    int i = line.indexOf("=");
                    if (i > -1) {
                        String key = line.substring(0, i);
                        String value = line.substring(i + 1);
                        SYSTEM_ENV_MAP.put(key, value);
                    }
                }
            }
        } catch (IOException e) {
            _LOG.warn(RuntimeUtils.unwrapThrow(e));
        }
    }

    /**
     * ???
     *
     * @return ??
     */
    public static Map<String, String> getSystemEnvs() {
        if (SYSTEM_ENV_MAP.isEmpty()) {
            initSystemEnvs();
        }
        return SYSTEM_ENV_MAP;
    }

    /**
     * ???
     *
     * @param envName ??null
     * @return ???????
     */
    public static String getSystemEnv(String envName) {
        if (StringUtils.isNotBlank(envName)) {
            if (SYSTEM_ENV_MAP.isEmpty()) {
                initSystemEnvs();
            }
            return SYSTEM_ENV_MAP.get(envName);
        }
        return null;
    }

}