Java Delete File Recursively deleteRecursively(File file)

Description

delete Recursively

License

Apache License

Declaration

public static void deleteRecursively(File file) throws IOException 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import com.google.common.base.Preconditions;

import java.io.File;
import java.io.IOException;

public class Main {
    public static void deleteRecursively(File file) throws IOException {
        if (file == null) {
            return;
        }/*from  w ww  .j av a2s .co  m*/

        if (file.isDirectory() && !isSymlink(file)) {
            IOException savedIOException = null;
            for (File child : listFilesSafely(file)) {
                try {
                    deleteRecursively(child);
                } catch (IOException e) {
                    // In case of multiple exceptions, only last one will be thrown
                    savedIOException = e;
                }
            }
            if (savedIOException != null) {
                throw savedIOException;
            }
        }

        boolean deleted = file.delete();
        // Delete can also fail if the file simply did not exist.
        if (!deleted && file.exists()) {
            throw new IOException("Failed to delete: " + file.getAbsolutePath());
        }
    }

    private static boolean isSymlink(File file) throws IOException {
        Preconditions.checkNotNull(file);
        File fileInCanonicalDir = null;
        if (file.getParent() == null) {
            fileInCanonicalDir = file;
        } else {
            fileInCanonicalDir = new File(file.getParentFile().getCanonicalFile(), file.getName());
        }
        return !fileInCanonicalDir.getCanonicalFile().equals(fileInCanonicalDir.getAbsoluteFile());

    }

    private static File[] listFilesSafely(File file) throws IOException {
        if (file.exists()) {
            File[] files = file.listFiles();
            if (files == null) {
                throw new IOException("Failed to list files for dir: " + file);
            }
            return files;
        } else {
            return new File[0];
        }
    }
}

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