org.openlegacy.utils.FileUtils.java Source code

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Here is the source code for org.openlegacy.utils.FileUtils.java

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/*******************************************************************************
 * Copyright (c) 2014 OpenLegacy Inc.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     OpenLegacy Inc. - initial API and implementation
 *******************************************************************************/
package org.openlegacy.utils;

import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.SystemUtils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.text.MessageFormat;
import java.util.Arrays;
import java.util.Map;
import java.util.Set;

public class FileUtils {

    /**
     * @param content
     * @return a file name which doesn't exists. null if file content was matched by one of the scanned files
     * @throws IOException
     */
    public static File findNextAndDifferentFreeFile(File baseDir, String fileNameNoSuffix, String fileExtension,
            byte[] content) throws IOException {
        File file = null;
        String fileSuffix = "";
        int filesCount = 1;
        do {
            String fileName = MessageFormat.format("{0}{1}.{2}", fileNameNoSuffix, fileSuffix, fileExtension);
            file = new File(baseDir, fileName);

            if (file.exists()) {
                byte[] fileContent = org.apache.commons.io.FileUtils.readFileToByteArray(file);
                if (Arrays.equals(fileContent, content)) {
                    return null;
                }

                fileSuffix = "_" + filesCount++;
            }
        } while (file.exists());

        file.getParentFile().mkdirs();
        return file;
    }

    public static void copyAndReplace(InputStream inputStream, OutputStream outputStream,
            Map<String, String> keysValues) throws IOException {
        String content = IOUtils.toString(inputStream);

        if (keysValues != null) {
            Set<String> keys = keysValues.keySet();
            for (String key : keys) {
                content = content.replaceAll(key, keysValues.get(key));
            }
        }
        outputStream.write(content.getBytes());
    }

    public static String fileWithoutExtension(String filename) {
        if (!filename.contains(".")) {
            return filename;
        }
        filename = new File(filename).getName();
        return filename.substring(0, filename.lastIndexOf("."));
    }

    public static String fileWithoutAnyExtension(String filename) {
        if (!filename.contains(".")) {
            return filename;
        }
        filename = new File(filename).getName();
        return filename.substring(0, filename.indexOf("."));
    }

    public static String fileExtension(String filename) {
        if (!filename.contains(".")) {
            return "";
        }
        filename = new File(filename).getName();
        return filename.substring(filename.lastIndexOf("."), filename.length());
    }

    public static File extractToTempDir(URL resource, String fileName) throws IOException {
        File tempDir = SystemUtils.getJavaIoTmpDir();
        File file = new File(tempDir, fileName);
        FileOutputStream output = null;
        try {
            output = new FileOutputStream(file);
            IOUtils.copy(resource.openStream(), output);
        } finally {
            IOUtils.closeQuietly(output);
        }
        return file;
    }

    /**
     * Deletes the file if it's empty
     * 
     * @param file
     */
    public static void deleteEmptyFile(File file) {
        if (file == null) {
            return;
        }
        try {
            FileInputStream fis = new FileInputStream(file);
            byte[] bytes = IOUtils.toByteArray(fis);
            if (bytes.length == 0) {
                org.apache.commons.io.FileUtils.deleteQuietly(file);
            }
        } catch (IOException e) {
            // do nothing
        }
    }

    public static void write(String str, File file) throws IOException {
        FileOutputStream fos = new FileOutputStream(file);
        try {
            IOUtils.write(str, fos);
        } finally {
            IOUtils.closeQuietly(fos);
        }
    }
}