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Apache CXF example source code file (FileUtils.java)

This example Apache CXF source code file (FileUtils.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Apache CXF tags/keywords

arraylist, arraylist, bufferedreader, exception, file, file, fileutils, io, ioexception, list, list, regex, runtimeexception, string, string, thread, util

The Apache CXF FileUtils.java source code

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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 org.apache.cxf.helpers;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public final class FileUtils {
    private static final int RETRY_SLEEP_MILLIS = 10;
    private static File defaultTempDir;
    
    
    private FileUtils() {
        
    }
    
    public static synchronized File getDefaultTempDir() {
        if (defaultTempDir != null
            && defaultTempDir.exists()) {
            return defaultTempDir;
        }
        
        String s = null;
        try {
            s = System.getProperty(FileUtils.class.getName() + ".TempDirectory");
        } catch (SecurityException e) {
            //Ignorable, we'll use the default
        }
        if (s != null) {
            //assume someone outside of us will manage the directory
            File f = new File(s);
            if (f.mkdirs()) {
                defaultTempDir = f;                
            }
        }
        if (defaultTempDir == null) {
            int x = (int)(Math.random() * 1000000);
            s = System.getProperty("java.io.tmpdir");
            File checkExists = new File(s);
            if (!checkExists.exists()) {
                throw new RuntimeException("The directory " 
                                       + checkExists.getAbsolutePath() 
                                       + " does not exist, please set java.io.tempdir"
                                       + " to an existing directory");
            }
            File f = new File(s, "cxf-tmp-" + x);
            while (!f.mkdir()) {
                x = (int)(Math.random() * 1000000);
                f = new File(s, "cxf-tmp-" + x);
            }
            defaultTempDir = f;
            final File f2 = f;
            Thread hook = new Thread() {
                @Override
                public void run() {
                    removeDir(f2, true);
                }
            };
            Runtime.getRuntime().addShutdownHook(hook);            
        }
        return defaultTempDir;
    }

    public static void mkDir(File dir) {
        if (dir == null) {
            throw new RuntimeException("dir attribute is required");
        }

        if (dir.isFile()) {
            throw new RuntimeException("Unable to create directory as a file "
                                    + "already exists with that name: " + dir.getAbsolutePath());
        }

        if (!dir.exists()) {
            boolean result = doMkDirs(dir);
            if (!result) {
                String msg = "Directory " + dir.getAbsolutePath()
                             + " creation was not successful for an unknown reason";
                throw new RuntimeException(msg);
            }
        }
    }

    /**
     * Attempt to fix possible race condition when creating directories on
     * WinXP, also Windows2000. If the mkdirs does not work, wait a little and
     * try again.
     */
    private static boolean doMkDirs(File f) {
        if (!f.mkdirs()) {
            try {
                Thread.sleep(RETRY_SLEEP_MILLIS);
                return f.mkdirs();
            } catch (InterruptedException ex) {
                return f.mkdirs();
            }
        }
        return true;
    }

    public static void removeDir(File d) {
        removeDir(d, false);
    }
    private static void removeDir(File d, boolean inShutdown) {
        String[] list = d.list();
        if (list == null) {
            list = new String[0];
        }
        for (int i = 0; i < list.length; i++) {
            String s = list[i];
            File f = new File(d, s);
            if (f.isDirectory()) {
                removeDir(f, inShutdown);
            } else {
                delete(f, inShutdown);
            }
        }
        delete(d, inShutdown);
    }

    public static void delete(File f) {
        delete(f, false);
    }
    public static void delete(File f, boolean inShutdown) {
        if (!f.delete()) {
            if (isWindows()) {
                System.gc();
            }
            try {
                Thread.sleep(RETRY_SLEEP_MILLIS);
            } catch (InterruptedException ex) {
                // Ignore Exception
            }
            if (!f.delete() && !inShutdown) {
                f.deleteOnExit();
            }
        }
    }

    private static boolean isWindows() {
        String osName = System.getProperty("os.name").toLowerCase(Locale.US);
        return osName.indexOf("windows") > -1;
    }

    public static File createTempFile(String prefix, String suffix) throws IOException {
        return createTempFile(prefix, suffix, null, false);
    }
    
    public static File createTempFile(String prefix, String suffix, File parentDir,
                               boolean deleteOnExit) throws IOException {
        File result = null;
        File parent = (parentDir == null)
            ? getDefaultTempDir()
            : parentDir;
            
        if (suffix == null) {
            suffix = ".tmp";
        }
        if (prefix == null) {
            prefix = "cxf";
        } else if (prefix.length() < 3) {
            prefix = prefix + "cxf";
        }
        result = File.createTempFile(prefix, suffix, parent);

        //if parentDir is null, we're in our default dir
        //which will get completely wiped on exit from our exit
        //hook.  No need to set deleteOnExit() which leaks memory.
        if (deleteOnExit && parentDir != null) {
            result.deleteOnExit();
        }
        return result;
    }
    
    public static String getStringFromFile(File location) {
        InputStream is = null;
        String result = null;

        try {
            is = new FileInputStream(location);
            result = normalizeCRLF(is);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (is != null) {
                try {
                    is.close();
                } catch (Exception e) {
                    //do nothing
                }
            }
        }

        return result;
    }

    public static String normalizeCRLF(InputStream instream) {
        BufferedReader in = new BufferedReader(new InputStreamReader(instream));
        StringBuilder result = new StringBuilder();
        String line = null;

        try {
            line = in.readLine();
            while (line != null) {
                String[] tok = line.split("\\s");

                for (int x = 0; x < tok.length; x++) {
                    String token = tok[x];
                    result.append("  " + token);
                }
                line = in.readLine();
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }

        String rtn = result.toString();

        rtn = ignoreTokens(rtn, "<!--", "-->");
        rtn = ignoreTokens(rtn, "/*", "*/");
        return rtn;
    }
    
    private static String ignoreTokens(final String contents, 
                                       final String startToken, final String endToken) {
        String rtn = contents;
        int headerIndexStart = rtn.indexOf(startToken);
        int headerIndexEnd = rtn.indexOf(endToken);
        if (headerIndexStart != -1 && headerIndexEnd != -1 && headerIndexStart < headerIndexEnd) {
            rtn = rtn.substring(0, headerIndexStart - 1)
                + rtn.substring(headerIndexEnd + endToken.length() + 1);
        }
        return rtn;
    }

    public static List<File> getFiles(File dir, final String pattern) {
        return getFiles(dir, pattern, null);
    }
    public static List<File> getFilesRecurse(File dir, final String pattern) {
        return getFilesRecurse(dir, pattern, null);
    }

    public static List<File> getFiles(File dir, final String pattern, File exclude) {
        return getFilesRecurse(dir, Pattern.compile(pattern), exclude, false, new ArrayList<File>());
    }
    public static List<File> getFilesRecurse(File dir, final String pattern, File exclude) {
        return getFilesRecurse(dir, Pattern.compile(pattern), exclude, true, new ArrayList<File>());    
    }
    private static List<File> getFilesRecurse(File dir, 
                                              Pattern pattern,
                                              File exclude, boolean rec,
                                              List<File> fileList) {
        for (File file : dir.listFiles()) {
            if (file.equals(exclude)) {
                continue;
            }
            if (file.isDirectory() && rec) {
                getFilesRecurse(file, pattern, exclude, rec, fileList);
            } else {
                Matcher m = pattern.matcher(file.getName());
                if (m.matches()) {
                    fileList.add(file);                                
                }
            }
        }
        return fileList;
    }

    public static List<String> readLines(File file) throws Exception {
        if (!file.exists()) {
            return new ArrayList<String>();
        }
        BufferedReader reader = new BufferedReader(new FileReader(file));
        List<String> results = new ArrayList();
        try {
            String line = reader.readLine();
            while (line != null) {
                results.add(line);
                line = reader.readLine();
            }
        } finally {
            reader.close();
        }
        return results;
    }
}

Other Apache CXF examples (source code examples)

Here is a short list of links related to this Apache CXF FileUtils.java source code file:

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