I am encoding a class that compares files of two directories by comparing the byte arrays of each file. However, I do not get the expected results; identical files are not allowed as identical files.
First problem:
Aligning Byte [] files with equals () resolves false with the corresponding files (it is checked by only one file to circumvent a possible index misalignment error, the check still fixes the false value.).
The second problem:
When using Vector containsAll () to verify that both Byte [] vectors match (one vector for each directory with a byte [] for each file), this check leads to false even with identical directories (this check has been removed from the code below. ) So is there a problem with how I align the two vectors? (I checked this using two directories with matching files in the same order that were loaded into the corresponding indexes, which still leads to a Vector mismatch).
The third problem:
When there are subdirectories in the checked directories, an exception is thrown from the file, which indicates that access is denied. Why is this happening? How can I get around this? I do not want to check the files contained in subdirectories, but I am developing code so that the end user does not worry about the subdirectories of the compared directories. This only happens if there are subdirectories; it works fine when there are no subdirectories in the checked directories.
Exception example:
Byte reading error!
Byte reading error!
java.io.FileNotFoundException: C:\Dir1\Dir2\Dir3\Dir4\SubDir (Access is denied)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(Unknown Source)
at tools.filesystem.filecomparison.FileComparator.getBytes(FileComparator.java:166)
at tools.filesystem.filecomparison.FileComparator.main(FileComparator.java:102)
java.io.FileNotFoundException: C:\Dir1\Dir2\Dir3\Dir4\SubDir Files (Access is denied)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(Unknown Source)
at tools.filesystem.filecomparison.FileComparator.getBytes(FileComparator.java:166)
at tools.filesystem.filecomparison.FileComparator.main(FileComparator.java:111)
Here is the code:
package tools.filesystem.filecomparison;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Scanner;
import java.util.Vector;
public class FileComparator
{
public static void main(String[] args)
{
String workingDir1 = "";
String workingDir2 = "";
File[] fileArr1 = null;
File[] fileArr2 = null;
Vector<File> fileVec1 = new Vector<File>();
Vector<File> fileVec2 = new Vector<File>();
Scanner console = new Scanner(System.in);
while (true)
{
System.out.println("Enter working directory one . . . .");
workingDir1 = console.nextLine();
workingDir1.replace("\\", "\\\\");
System.out.println("Enter working directory two . . . .");
workingDir2 = console.nextLine();
workingDir2.replace("\\", "\\\\");
File folder1 = new File(workingDir1);
File[] listOfFiles1 = folder1.listFiles();
File folder2 = new File(workingDir1);
File[] listOfFiles2 = folder2.listFiles();
fileArr1 = listOfFiles1;
fileArr2 = listOfFiles2;
System.out.println("\nWorking Directory 1 Files\n");
for (int i = 0; i < listOfFiles1.length; i++)
{
if (listOfFiles1[i].isFile())
{
System.out.println(" " + listOfFiles1[i].getName());
}
}
System.out.println("\nWorking Directory 2 Files\n");
for (int i = 0; i < listOfFiles2.length; i++)
{
if (listOfFiles2[i].isFile())
{
System.out.println(" " + listOfFiles2[i].getName());
}
}
for (File fle : fileArr1)
{
fileVec1.add(fle);
}
for (File fle : fileArr2)
{
fileVec2.add(fle);
}
if (fileVec1.containsAll(fileVec2))
break;
else
{
System.out.println("Directories do not contain the same files!\nContinue anyways? y/n?");
if (console.nextLine().equalsIgnoreCase("y"))
break;
else if (console.nextLine().equalsIgnoreCase("n"))
continue;
}
}
Vector<Vector<File>> alignedVectors = align(fileVec1, fileVec2);
fileVec1 = alignedVectors.elementAt(0);
fileVec2 = alignedVectors.elementAt(1);
Vector<byte[]> fileByteVect1 = new Vector<byte[]>();
Vector<byte[]> fileByteVect2 = new Vector<byte[]>();
try
{
fileByteVect1 = getBytes(fileVec1);
}
catch (IOException e)
{
System.out.println("Byte reading error!");
e.printStackTrace();
}
try
{
fileByteVect2 = getBytes(fileVec2);
}
catch (IOException e)
{
System.out.println("Byte reading error!");
e.printStackTrace();
}
boolean[] check = new boolean[fileByteVect1.capacity()];
int i1 = 0;
for (byte[] e : fileByteVect1)
{
System.out.println("Vector 1 count " + i1);
System.out.println(e.toString());
for (byte b : e)
{
System.out.print(b + " ");
}
i1++;
}
int i2 = 0;
for (byte[] e : fileByteVect2)
{
System.out.println("Vector 2 count " + i2);
System.out.println(e.toString());
for (byte b : e)
{
System.out.print(b + " ");
}
i2++;
}
if (fileByteVect1.size() == fileByteVect2.size())
{
System.out.println(fileByteVect1.size());
for (int i = 0; i < fileByteVect1.size(); i++ )
{
if (fileByteVect1.elementAt(i).equals(fileByteVect2.elementAt(i)))
{
check[i] = true;
System.out.println("File at index " + i + " are identical");
}
else
{
check[i] = false;
System.out.println("File at index " + i + " are not identical");
}
}
}
else
System.out.println("Files do not match!");
}
public static Vector<Vector<File>> align(Vector<File> fileVect1, Vector<File> fileVect2)
{
Vector<Vector<File>> mainBuffer = new Vector<Vector<File>>();
Vector<File> bufferFileVect = new Vector<File>();
for (File fle1 : fileVect1)
{
for (File fle2 : fileVect2)
{
if (fle1.getName().equals(fle2.getName()))
bufferFileVect.add(fle2);
}
}
mainBuffer.add(fileVect1);
mainBuffer.add(bufferFileVect);
return mainBuffer;
}
public static Vector<byte[]> getBytes(Vector<File> fileVector) throws IOException
{
Vector<byte[]> outVector = new Vector<byte[]>();
for (File file : fileVector)
{
InputStream is = new FileInputStream(file);
long length = file.length();
if (length > Integer.MAX_VALUE)
{
System.out.println("File is too large!");
}
byte[] bytes = new byte[(int) length];
int offset = 0;
int numRead = 0;
while (offset < bytes.length && (numRead = is.read(bytes, offset, bytes.length - offset)) >= 0)
{
offset += numRead;
}
if (offset < bytes.length)
{
throw new IOException("Could not completely read file " + file.getName());
}
outVector.add(bytes);
is.close();
}
return outVector;
}
}
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