@@ -971,21 +971,31 @@ public class FileUtils {
/**
* Compares the contents of two files.
*
* <p>simple but sub-optimal comparision algorithm. written for
* working rather than fast. Better would be a block read into
* buffers followed by long comparisions apart from the final 1-7
* bytes.</p>
*
* @param f1 the file whose content is to be compared.
* @param f2 the other file whose content is to be compared.
*
* @return true if the content of the files is the same.
*
* @throws IOException if the files cannot be read.
*
* @since 1.9
*/
public boolean contentEquals(File f1, File f2) throws IOException {
return contentEquals(f1, f2, false);
}
/**
* Compares the contents of two files.
*
* @param f1 the file whose content is to be compared.
* @param f2 the other file whose content is to be compared.
* @param textfile true if the file is to be treated as a text file and
* differences in kind of line break are to be ignored.
*
* @return true if the content of the files is the same.
*
* @throws IOException if the files cannot be read.
* @since ant 1.7
*/
public boolean contentEquals(File f1, File f2, boolean textfile) throws IOException {
if (f1.exists() != f2.exists()) {
return false;
}
@@ -1005,6 +1015,27 @@ public class FileUtils {
return true;
}
if (textfile) {
return textEquals(f1, f2);
} else {
return binaryEquals(f1, f2);
}
}
/**
* Binary compares the contents of two files.
* <p>
* simple but sub-optimal comparision algorithm. written for working
* rather than fast. Better would be a block read into buffers followed
* by long comparisions apart from the final 1-7 bytes.
* </p>
*
* @param f1 the file whose content is to be compared.
* @param f2 the other file whose content is to be compared.
* @return true if the content of the files is the same.
* @throws IOException if the files cannot be read.
*/
private boolean binaryEquals(File f1, File f2) throws IOException {
if (f1.length() != f2.length()) {
// different size =>false
return false;
@@ -1033,6 +1064,40 @@ public class FileUtils {
}
}
/**
* Text compares the contents of two files.
*
* Ignores different kinds of line endings.
*
* @param f1 the file whose content is to be compared.
* @param f2 the other file whose content is to be compared.
* @return true if the content of the files is the same.
* @throws IOException if the files cannot be read.
*/
private boolean textEquals(File f1, File f2) throws IOException {
BufferedReader in1 = null;
BufferedReader in2 = null;
try {
in1 = new BufferedReader(new FileReader(f1));
in2 = new BufferedReader(new FileReader(f2));
String expected = in1.readLine();
while (expected != null) {
if (!expected.equals(in2.readLine())) {
return false;
}
expected = in1.readLine();
}
if (in2.readLine() != null) {
return false;
}
return true;
} finally {
close(in1);
close(in2);
}
}
/**
* This was originally an emulation of {@link File#getParentFile} for JDK 1.1,
* but it is now implemented using that method (Ant 1.7 onwards).
Jacobus Martinus Kruithof