com.tek271.reverseProxy.utils.FileTools.java Source code

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Here is the source code for com.tek271.reverseProxy.utils.FileTools.java

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/*
This file is part of Tek271 Reverse Proxy Server.
    
Tek271 Reverse Proxy Server 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 3 of the License, or
(at your option) any later version.
    
Tek271 Reverse Proxy Server 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.
    
You should have received a copy of the GNU Lesser General Public License
along with Tek271 Reverse Proxy Server.  If not, see http://www.gnu.org/licenses/
 */
package com.tek271.reverseProxy.utils;

import java.io.*;
import java.util.List;

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.StringUtils;

public class FileTools {

    public static InputStream readFromContextToInputStream(String fileName) {
        InputStream inputStream = Thread.currentThread().getContextClassLoader().getResourceAsStream(fileName);
        if (inputStream == null) {
            throw new IllegalArgumentException("Cannot find " + fileName);
        }
        return inputStream;
    }

    public static String readTextFileFromContext(String fileName) {
        InputStream stream = readFromContextToInputStream(fileName);
        return toString(stream);
    }

    static String toString(InputStream stream) {
        try {
            return IOUtils.toString(stream);
        } catch (Exception e) {
            throw new IllegalArgumentException("Cannot read stream", e);
        }
    }

    public static List<String> readLinesFromContext(String fileName) {
        InputStream is = readFromContextToInputStream(fileName);
        try {
            return IOUtils.readLines(is);
        } catch (IOException e) {
            throw new IllegalArgumentException("Cannot read file: " + fileName, e);
        }
    }

    public static long size(File file) {
        if (file == null) {
            return 0;
        }
        return file.length();
    }

    public static String readTextFileContent(File file) {
        if (file == null)
            return "";

        String text;
        try {
            text = FileUtils.readFileToString(file);
        } catch (IOException e) {
            throw new IllegalArgumentException("Could not read file's text.", e);
        }
        return StringUtils.defaultString(text);
    }

}