com.liferay.portal.kernel.util.SystemProperties.java Source code

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Here is the source code for com.liferay.portal.kernel.util.SystemProperties.java

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/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 */

package com.liferay.portal.kernel.util;

import java.io.IOException;
import java.io.InputStream;

import java.net.URL;

import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @author Brian Wing Shun Chan
 * @author Mirco Tamburini
 * @author Brett Randall
 * @author Shuyang Zhou
 */
public class SystemProperties {

    public static final String SYSTEM_PROPERTIES_QUIET = "system.properties.quiet";

    public static final String SYSTEM_PROPERTIES_SET = "system.properties.set";

    public static final String SYSTEM_PROPERTIES_SET_OVERRIDE = "system.properties.set.override";

    public static final String TMP_DIR = "java.io.tmpdir";

    public static void clear(String key) {
        System.clearProperty(key);

        _properties.remove(key);
    }

    public static String get(String key) {
        String value = _properties.get(key);

        if (value == null) {
            value = System.getProperty(key);
        }

        return value;
    }

    public static Properties getProperties() {
        return PropertiesUtil.fromMap(_properties);
    }

    public static void load(ClassLoader classLoader) {
        Properties properties = new Properties();

        List<URL> urls = null;

        if (!GetterUtil.getBoolean(System.getProperty(SYSTEM_PROPERTIES_QUIET))) {

            urls = new ArrayList<>();
        }

        // system.properties

        try {
            Enumeration<URL> enumeration = classLoader.getResources("system.properties");

            while (enumeration.hasMoreElements()) {
                URL url = enumeration.nextElement();

                try (InputStream inputStream = url.openStream()) {
                    properties.load(inputStream);
                }

                if (urls != null) {
                    urls.add(url);
                }
            }
        } catch (IOException ioe) {
            throw new ExceptionInInitializerError(ioe);
        }

        // system-ext.properties

        try {
            Enumeration<URL> enumeration = classLoader.getResources("system-ext.properties");

            while (enumeration.hasMoreElements()) {
                URL url = enumeration.nextElement();

                try (InputStream inputStream = url.openStream()) {
                    properties.load(inputStream);
                }

                if (urls != null) {
                    urls.add(url);
                }
            }
        } catch (IOException ioe) {
            throw new ExceptionInInitializerError(ioe);
        }

        // Set environment properties

        SystemEnv.setProperties(properties);

        // Set system properties

        if (GetterUtil.getBoolean(System.getProperty(SYSTEM_PROPERTIES_SET), true)) {

            boolean systemPropertiesSetOverride = GetterUtil
                    .getBoolean(System.getProperty(SYSTEM_PROPERTIES_SET_OVERRIDE), true);

            for (Map.Entry<Object, Object> entry : properties.entrySet()) {
                String key = String.valueOf(entry.getKey());

                if (systemPropertiesSetOverride || Validator.isNull(System.getProperty(key))) {

                    System.setProperty(key, String.valueOf(entry.getValue()));
                }
            }
        }

        // Use a fast concurrent hash map implementation instead of the slower
        // java.util.Properties

        PropertiesUtil.fromProperties(properties, _properties);

        if (urls != null) {
            for (URL url : urls) {
                System.out.println("Loading " + url);
            }
        }
    }

    public static void set(String key, String value) {
        System.setProperty(key, value);

        _properties.put(key, value);
    }

    private static final Map<String, String> _properties = new ConcurrentHashMap<>();

    static {
        Thread currentThread = Thread.currentThread();

        ClassLoader classLoader = currentThread.getContextClassLoader();

        load(classLoader);
    }

}