Cleanups in FileUtil - direct use methods from NIO

- remove unused methods
- direct use methods from NIO
- use try-with-resources
- new FileInputStream -> Files.newInputStream

src/main/java/org/codehaus/mojo/license/AbstractAddThirdPartyMojo.java

@@ -50,7 +50,6 @@
 import org.codehaus.mojo.license.api.ThirdPartyTool;
 import org.codehaus.mojo.license.api.ThirdPartyToolException;
 import org.codehaus.mojo.license.model.LicenseMap;
-import org.codehaus.mojo.license.utils.FileUtil;
 import org.codehaus.mojo.license.utils.MojoHelper;
 import org.codehaus.mojo.license.utils.SortedProperties;
 import org.codehaus.mojo.license.utils.StringToList;
@@ -723,7 +722,7 @@ protected void init() throws Exception {
 
         if (generateBundle) {
 
-            File bundleFile = FileUtil.getFile(outputDirectory, bundleThirdPartyPath);
+            File bundleFile = new File(outputDirectory, bundleThirdPartyPath);
 
             LOG.debug("bundle third-party file: {} last modified: {}", bundleFile, bundleFile.lastModified());
             doGenerateBundle = force || !bundleFile.exists() || projectFile.lastModified() > bundleFile.lastModified();

src/main/java/org/codehaus/mojo/license/AbstractDownloadLicensesMojo.java

@@ -991,12 +991,11 @@ private void initDirectories() throws MojoExecutionException {
                     FileUtils.cleanDirectory(licensesOutputDirectory);
                 }
             } else {
-                FileUtil.createDirectoryIfNecessary(licensesOutputDirectory);
+                Files.createDirectories(licensesOutputDirectory.toPath());
             }
 
-            FileUtil.createDirectoryIfNecessary(licensesOutputFile.getParentFile());
-
-            FileUtil.createDirectoryIfNecessary(licensesErrorsFile.getParentFile());
+            Files.createDirectories(licensesOutputFile.getParentFile().toPath());
+            Files.createDirectories(licensesErrorsFile.getParentFile().toPath());
         } catch (IOException e) {
             throw new MojoExecutionException("Unable to create a directory...", e);
         }

src/main/java/org/codehaus/mojo/license/AbstractFileHeaderMojo.java

@@ -704,7 +704,7 @@ private void processFile(FileHeaderProcessor processor, File file) throws IOExce
             if (doFinalize) {
                 finalizeFile(file, processFile);
             } else {
-                FileUtil.deleteFile(processFile);
+                Files.deleteIfExists(processFile.toPath());
             }
         }
     }
@@ -836,11 +836,8 @@ private void finalizeFile(File file, File processFile) throws IOException {
         if (isKeepBackup() && !isDryRun()) {
             File backupFile = FileUtil.getBackupFile(file);
 
-            if (backupFile.exists()) {
-
-                // always delete backup file, before the renaming
-                FileUtil.deleteFile(backupFile);
-            }
+            // always delete backup file, before the renaming
+            Files.deleteIfExists(backupFile.toPath());
 
             LOG.debug(" - backup original file {}", file);
             Files.copy(file.toPath(), backupFile.toPath(), StandardCopyOption.COPY_ATTRIBUTES);
@@ -849,13 +846,13 @@ private void finalizeFile(File file, File processFile) throws IOException {
         if (isDryRun()) {
 
             // dry run, delete temporary file
-            FileUtil.deleteFile(processFile);
+            Files.deleteIfExists(processFile.toPath());
         } else {
             try {
                 // replace file with the updated one
                 String updatedContent = FileUtil.readAsString(processFile, getEncoding());
                 FileUtil.printString(file, updatedContent, getEncoding());
-                FileUtil.deleteFile(processFile);
+                Files.deleteIfExists(processFile.toPath());
             } catch (IOException e) {
                 LOG.warn("Error updating {} -> {}", processFile, file, e);
             }

src/main/java/org/codehaus/mojo/license/AddThirdPartyMojo.java

@@ -25,6 +25,7 @@
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
+import java.nio.file.Files;
 import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.List;
@@ -47,7 +48,6 @@
 import org.codehaus.mojo.license.api.ResolvedProjectDependencies;
 import org.codehaus.mojo.license.api.ThirdPartyToolException;
 import org.codehaus.mojo.license.model.LicenseMap;
-import org.codehaus.mojo.license.utils.FileUtil;
 import org.codehaus.mojo.license.utils.MojoHelper;
 import org.codehaus.mojo.license.utils.SortedProperties;
 import org.slf4j.Logger;
@@ -181,7 +181,7 @@ protected void doAction() throws Exception {
 
             // there is no missing dependencies, but still a missing file, delete it
             LOG.info("There is no dependency to put in missing file, delete it at {}", missingFile);
-            FileUtil.deleteFile(missingFile);
+            Files.deleteIfExists(missingFile.toPath());
         }
 
         if (!unsafe && deployMissingFile && MapUtils.isNotEmpty(unsafeMappings)) {
@@ -354,7 +354,7 @@ private boolean computeDoGenerateMissingFile(
      */
     private void writeMissingFile() throws IOException {
 
-        FileUtil.createDirectoryIfNecessary(missingFile.getParentFile());
+        Files.createDirectories(missingFile.getParentFile().toPath());
         LOG.info("Regenerate missing license file {}", missingFile);
 
         FileOutputStream writer = new FileOutputStream(missingFile);

src/main/java/org/codehaus/mojo/license/LicensesXmlInsertVersionsMojo.java

@@ -23,6 +23,7 @@
  */
 
 import java.io.File;
+import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.HashMap;
 import java.util.List;
@@ -41,7 +42,6 @@
 import org.codehaus.mojo.license.download.LicenseSummaryReader;
 import org.codehaus.mojo.license.download.LicensedArtifact;
 import org.codehaus.mojo.license.download.ProjectLicenseInfo;
-import org.codehaus.mojo.license.utils.FileUtil;
 import org.codehaus.mojo.license.utils.MojoHelper;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -88,7 +88,7 @@ public void execute() throws MojoExecutionException, MojoFailureException {
         }
 
         try {
-            FileUtil.createDirectoryIfNecessary(licensesOutputFile.getParentFile());
+            Files.createDirectories(licensesOutputFile.getParentFile().toPath());
 
             final List<ProjectLicenseInfo> projectLicenseInfos =
                     LicenseSummaryReader.parseLicenseSummary(licensesInputFile);

src/main/java/org/codehaus/mojo/license/RemoveFileHeaderMojo.java

@@ -24,6 +24,7 @@
 
 import java.io.File;
 import java.io.IOException;
+import java.nio.file.Files;
 import java.util.Collections;
 import java.util.EnumMap;
 import java.util.HashSet;
@@ -490,7 +491,7 @@ private void processFile(FileHeaderTransformer transformer, File file) throws IO
             if (doFinalize) {
                 finalizeFile(file, processFile);
             } else {
-                FileUtil.deleteFile(processFile);
+                Files.deleteIfExists(processFile.toPath());
             }
         }
     }
@@ -509,11 +510,8 @@ private void finalizeFile(File file, File processFile) throws IOException {
         if (isKeepBackup() && !isDryRun()) {
             File backupFile = FileUtil.getBackupFile(file);
 
-            if (backupFile.exists()) {
-
-                // always delete backup file, before the renaming
-                FileUtil.deleteFile(backupFile);
-            }
+            // always delete backup file, before the renaming
+            Files.deleteIfExists(backupFile.toPath());
 
             LOG.debug(" - backup original file {}", file);
             FileUtil.renameFile(file, backupFile);
@@ -522,10 +520,9 @@ private void finalizeFile(File file, File processFile) throws IOException {
         if (isDryRun()) {
 
             // dry run, delete temporary file
-            FileUtil.deleteFile(processFile);
+            Files.deleteIfExists(processFile.toPath());
         } else {
             try {
-
                 // replace file with the updated one
                 FileUtil.renameFile(processFile, file);
             } catch (IOException e) {

src/main/java/org/codehaus/mojo/license/UpdateProjectLicenseMojo.java

@@ -198,7 +198,7 @@ protected void doAction() throws Exception {
             if (generateBundle) {
 
                 // creates the bundled license file
-                File bundleTarget = FileUtil.getFile(outputDirectory, bundleLicensePath);
+                File bundleTarget = new File(outputDirectory, bundleLicensePath);
                 FileUtil.copyFile(licenseFile, bundleTarget);
 
                 if (!resourceTarget.getName().equals(bundleTarget.getName())) {

src/main/java/org/codehaus/mojo/license/api/DefaultThirdPartyTool.java

@@ -29,11 +29,11 @@
 
 import java.io.ByteArrayInputStream;
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.Reader;
 import java.io.StringReader;
+import java.nio.file.Files;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
@@ -599,7 +599,7 @@ public void writeBundleThirdPartyFile(File thirdPartyFile, File outputDirectory,
             throws IOException {
 
         // creates the bundled license file
-        File bundleTarget = FileUtil.getFile(outputDirectory, bundleThirdPartyPath);
+        File bundleTarget = new File(outputDirectory, bundleThirdPartyPath);
         LOG.info("Writing bundled third-party file to {}", bundleTarget);
         FileUtil.copyFile(thirdPartyFile, bundleTarget);
     }
@@ -637,7 +637,7 @@ private void loadOneGlobalSet(
         LOG.info("Loading global license map from {}: {}", dep.toString(), propFile.getAbsolutePath());
         SortedProperties props = new SortedProperties("utf-8");
 
-        try (InputStream propStream = new FileInputStream(propFile)) {
+        try (InputStream propStream = Files.newInputStream(propFile.toPath())) {
             props.load(propStream);
         } catch (IOException e) {
             throw new IOException("Unable to load " + propFile.getAbsolutePath(), e);

src/main/java/org/codehaus/mojo/license/utils/FileUtil.java

@@ -25,16 +25,13 @@
 import java.io.BufferedReader;
 import java.io.BufferedWriter;
 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.InputStreamReader;
-import java.io.OutputStream;
 import java.io.OutputStreamWriter;
 import java.io.PrintWriter;
 import java.io.StringReader;
+import java.nio.charset.Charset;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.security.MessageDigest;
@@ -59,76 +56,6 @@
  */
 public class FileUtil {
 
-    public static void tryClose(InputStream is) {
-        if (is == null) {
-            return;
-        }
-        try {
-            is.close();
-        } catch (IOException e) {
-            // do nothing
-        }
-    }
-
-    public static void tryClose(OutputStream os) {
-        if (os == null) {
-            return;
-        }
-        try {
-            os.close();
-        } catch (IOException e) {
-            // do nothing
-        }
-    }
-
-    /**
-     * Creates the directory (and his parents) if necessary.
-     *
-     * @param dir the directory to create if not exisiting
-     * @return {@code true} if directory was created, {@code false} if was no
-     *         need to create it
-     * @throws IOException if could not create directory
-     */
-    public static boolean createDirectoryIfNecessary(File dir) throws IOException {
-        if (!dir.exists()) {
-            boolean b = dir.mkdirs();
-            if (!b) {
-                throw new IOException("Could not create directory " + dir);
-            }
-            return true;
-        }
-        return false;
-    }
-
-    public static boolean createNewFile(File file) throws IOException {
-        createDirectoryIfNecessary(file.getParentFile());
-        if (!file.exists()) {
-            boolean b = file.createNewFile();
-            if (!b) {
-                throw new IOException("Could not create new file " + file);
-            }
-            return true;
-        }
-        return false;
-    }
-
-    /**
-     * Delete the given file.
-     *
-     * @param file the file to delete
-     * @throws IOException if could not delete the file
-     */
-    public static void deleteFile(File file) throws IOException {
-        if (!file.exists()) {
-            // file does not exist, can not delete it
-            return;
-        }
-        boolean b = file.delete();
-        if (!b) {
-            throw new IOException("could not delete file " + file);
-        }
-    }
-
     /**
      * Rename the given file to a new destination.
      *
@@ -158,18 +85,10 @@ public static void renameFile(File file, File destination) throws IOException {
      * @throws IOException if could not copy file.
      */
     public static void copyFile(File source, File target) throws IOException {
-        createDirectoryIfNecessary(target.getParentFile());
+        Files.createDirectories(target.getParentFile().toPath());
         FileUtils.copyFile(source, target);
     }
 
-    public static File getFile(File base, String... paths) {
-        StringBuilder buffer = new StringBuilder();
-        for (String path : paths) {
-            buffer.append(File.separator).append(path);
-        }
-        return new File(base, buffer.substring(1));
-    }
-
     /**
      * @param file the source file
      * @return the backup file
@@ -200,12 +119,9 @@ public static void backupFile(File f) throws IOException {
      * @throws IOException if IO pb
      */
     public static String readAsString(File file, String encoding) throws IOException {
-        FileInputStream inf = new FileInputStream(file);
-        BufferedReader in = new BufferedReader(new InputStreamReader(inf, encoding));
-        try {
+
+        try (BufferedReader in = Files.newBufferedReader(file.toPath(), Charset.forName(encoding))) {
             return IOUtil.toString(in);
-        } finally {
-            in.close();
         }
     }
 
@@ -218,7 +134,7 @@ public static String readAsString(File file, String encoding) throws IOException
      * @throws IOException if IO pb
      */
     public static void printString(File file, String content, String encoding) throws IOException {
-        createDirectoryIfNecessary(file.getParentFile());
+        Files.createDirectories(file.getParentFile().toPath());
 
         BufferedReader in;
         PrintWriter out;

src/main/java/org/codehaus/mojo/license/utils/SortedProperties.java

@@ -23,10 +23,10 @@
  */
 
 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.nio.file.Files;
 import java.util.Collections;
 import java.util.Enumeration;
 import java.util.List;
@@ -95,11 +95,8 @@ public Enumeration<Object> keys() {
      * @throws java.io.IOException if any io pb
      */
     public SortedProperties load(File src) throws IOException {
-        FileInputStream reader = new FileInputStream(src);
-        try {
+        try (InputStream reader = Files.newInputStream(src.toPath())) {
             load(reader);
-        } finally {
-            reader.close();
         }
         return this;
     }
@@ -111,11 +108,8 @@ public SortedProperties load(File src) throws IOException {
      * @throws java.io.IOException if any io pb
      */
     public void store(File dst) throws IOException {
-        OutputStream writer = new FileOutputStream(dst);
-        try {
+        try (OutputStream writer = Files.newOutputStream(dst.toPath())) {
             store(writer, null);
-        } finally {
-            writer.close();
         }
     }