com.wordnik.swagger.codegen.util.FileUtil.java Source code

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Here is the source code for com.wordnik.swagger.codegen.util.FileUtil.java

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/**
 *  Copyright 2011 Wordnik, Inc.
 *
 *  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 com.wordnik.swagger.codegen.util;

import com.wordnik.swagger.codegen.exception.CodeGenerationException;

import java.io.*;
import java.net.JarURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.Enumeration;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import org.apache.commons.lang.StringUtils;

/**
 * User: deepakmichael
 * Date: 03/08/11
 * Time: 12:02 AM
 */
public class FileUtil {

    /**
     * Creates directory if doesn't exists and also cleans the files of given type if directory already contains some
     * files.
     *
     * @param classLocation
     * @param fileExtension
     */
    public static void createOutputDirectories(String classLocation, String fileExtension) {
        File outputLocation = new File(classLocation);
        outputLocation.mkdirs(); //make folder if necessary
        //clear contents
        clearFolder(classLocation, fileExtension);

    }

    /**
     * Deletes a fingle file and returns false fi file doesn't exists
     * @param sFilePath
     * @return
     */
    public static boolean deleteFile(String sFilePath) {
        File oFile = new File(sFilePath);
        if (!oFile.exists()) {
            return false;
        }
        return oFile.delete();
    }

    /**
     * Deleet all the files from the specified location
     * @param directoryLocation
     */
    public static void clearFolder(String directoryLocation) {
        File fDir = new File(directoryLocation);
        File[] files = fDir.listFiles();
        if (files != null) {
            for (File aFile : files) {
                aFile.delete();
            }
        }
    }

    // Clears the folder of the files with extension
    public static void clearFolder(String strFolder, final String strExt) {
        File fLogDir = new File(strFolder);
        File[] fLogs = fLogDir.listFiles(new FilenameFilter() {
            public boolean accept(File fDir, String strName) {
                return (strName.endsWith(strExt));
            }
        });
        if (fLogs != null) {
            for (int i = 0; i < fLogs.length; i++) {
                deleteFile(fLogs[i].getAbsolutePath());
            }
        }
    }

    public static void copyDirectory(File srcPath, File dstPath) {
        if (srcPath.isDirectory()) {
            if (!dstPath.exists()) {
                dstPath.mkdir();
            }

            String files[] = srcPath.list();
            for (int i = 0; i < files.length; i++) {
                copyDirectory(new File(srcPath, files[i]), new File(dstPath, files[i]));
            }
        } else {
            if (!srcPath.exists()) {
                throw new CodeGenerationException("Source folder does not exist");
            } else {
                try {
                    InputStream in = new FileInputStream(srcPath);
                    OutputStream out = new FileOutputStream(dstPath);

                    // Transfer bytes from in to out
                    byte[] buf = new byte[1024];
                    int len;
                    while ((len = in.read(buf)) > 0) {
                        out.write(buf, 0, len);
                    }
                    in.close();
                    out.close();
                } catch (IOException e) {
                    e.printStackTrace();
                    throw new CodeGenerationException("Copy directory operation failed");
                }
            }
        }
    }

    public static void copyDirectoryFromUrl(final URL originUrl, final File destination) {
        try {
            final URLConnection urlConnection = originUrl.openConnection();
            if (urlConnection instanceof JarURLConnection) {
                FileUtil.copyJarResourcesRecursively(destination, (JarURLConnection) urlConnection);
            } else {
                FileUtil.copyDirectory(new File(originUrl.getPath()), destination);
            }
        } catch (final IOException e) {
            e.printStackTrace();
        }
    }

    public static boolean copyJarResourcesRecursively(final File destDir, final JarURLConnection jarConnection)
            throws IOException {

        final JarFile jarFile = jarConnection.getJarFile();

        for (final Enumeration<JarEntry> e = jarFile.entries(); e.hasMoreElements();) {
            final JarEntry entry = e.nextElement();
            if (entry.getName().startsWith(jarConnection.getEntryName())) {
                final String filename = StringUtils.removeStart(entry.getName(), //
                        jarConnection.getEntryName());

                final File f = new File(destDir, filename);
                if (!entry.isDirectory()) {
                    final InputStream entryInputStream = jarFile.getInputStream(entry);
                    if (!FileUtil.copyStream(entryInputStream, f)) {
                        return false;
                    }
                    entryInputStream.close();
                } else {
                    if (!FileUtil.ensureDirectoryExists(f)) {
                        throw new IOException("Could not create directory: " + f.getAbsolutePath());
                    }
                }
            }
        }
        return true;
    }

    private static boolean copyStream(final InputStream is, final File f) {
        try {
            return FileUtil.copyStream(is, new FileOutputStream(f));
        } catch (final FileNotFoundException e) {
            e.printStackTrace();
        }
        return false;
    }

    private static boolean copyStream(final InputStream is, final OutputStream os) {
        try {
            final byte[] buf = new byte[1024];

            int len = 0;
            while ((len = is.read(buf)) > 0) {
                os.write(buf, 0, len);
            }
            is.close();
            os.close();
            return true;
        } catch (final IOException e) {
            e.printStackTrace();
        }
        return false;
    }

    private static boolean ensureDirectoryExists(final File f) {
        return f.exists() || f.mkdir();
    }

}