com.jdom.util.properties.PropertiesUtil.java Source code

Introduction

Here is the source code for com.jdom.util.properties.PropertiesUtil.java

Source

/** 
 *  Copyright (C) 2012  Just Do One More
 *  
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.jdom.util.properties;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Properties;
import java.util.Set;

import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.StringUtils;

public final class PropertiesUtil {

    public static final char SEPARATOR = ',';

    private PropertiesUtil() {

    }

    public static Properties readPropertiesFile(final String string) throws IllegalArgumentException {
        InputStream is = new ByteArrayInputStream(string.getBytes());
        return readPropertiesFile(is);
    }

    public static Properties readPropertiesFile(final File file) throws IllegalArgumentException {
        InputStream is = null;
        try {
            is = new FileInputStream(file);
            return readPropertiesFile(is);
        } catch (FileNotFoundException e) {
            throw new IllegalArgumentException(e);
        } finally {
            IOUtils.closeQuietly(is);
        }
    }

    public static Properties readPropertiesFile(final InputStream is) throws IllegalArgumentException {

        Properties properties = new Properties();

        try {
            properties.load(is);
        } catch (IOException e) {
            throw new IllegalArgumentException("Unable to read the properties file!", e);
        } finally {
            IOUtils.closeQuietly(is);
        }

        return properties;
    }

    public static void writePropertiesFile(Properties properties, File outputFile) throws IllegalArgumentException {
        OutputStream os = null;

        try {
            outputFile.delete();
            outputFile.getParentFile().mkdirs();
            outputFile.createNewFile();
            os = new FileOutputStream(outputFile);

            properties.store(os, "");
        } catch (IOException e) {
            throw new IllegalArgumentException(e);
        } finally {
            IOUtils.closeQuietly(os);
        }
    }

    public static List<String> getPropertyAsList(Properties properties, String key) {
        String[] split = StringUtils.split(properties.getProperty(key), SEPARATOR);
        return (split != null && split.length > 0) ? Arrays.asList(split) : new ArrayList<String>();
    }

    public static Set<String> getPropertyAsSet(Properties properties, String key) {
        return new HashSet<String>(PropertiesUtil.getPropertyAsList(properties, key));
    }

    public static boolean getBoolean(Properties properties, String key, boolean defaultValue) {
        String stringValue = properties.getProperty(key, "" + defaultValue);
        return Boolean.parseBoolean(stringValue);
    }

    public static int getInteger(Properties properties, String key) {
        return Integer.parseInt(properties.getProperty(key));
    }

    public static <T> String join(Collection<T> collection) {
        return StringUtils.join(collection, SEPARATOR);
    }

    public static long getLong(Properties properties, String key) {
        return Long.parseLong(properties.getProperty(key));
    }
}