## Class DirectoryScanner

• All Implemented Interfaces:
Scanner

public class DirectoryScanner
extends AbstractScanner

Class for scanning a directory for files/directories which match certain criteria.

These criteria consist of selectors and patterns which have been specified. With the selectors you can select which files you want to have included. Files which are not selected are excluded. With patterns you can include or exclude files based on their filename.

The idea is simple. A given directory is recursively scanned for all files and directories. Each file/directory is matched against a set of selectors, including special support for matching against filenames with include and and exclude patterns. Only files/directories which match at least one pattern of the include pattern list or other file selector, and don't match any pattern of the exclude pattern list or fail to match against a required selector will be placed in the list of files/directories found.

When no list of include patterns is supplied, "**" will be used, which means that everything will be matched. When no list of exclude patterns is supplied, an empty list is used, such that nothing will be excluded. When no selectors are supplied, none are applied.

The filename pattern matching is done as follows: The name to be matched is split up in path segments. A path segment is the name of a directory or file, which is bounded by File.separator ('/' under UNIX, '\' under Windows). For example, "abc/def/ghi/xyz.java" is split up in the segments "abc", "def","ghi" and "xyz.java". The same is done for the pattern against which should be matched.

The segments of the name and the pattern are then matched against each other. When '**' is used for a path segment in the pattern, it matches zero or more path segments of the name.

There is a special case regarding the use of File.separators at the beginning of the pattern and the string to match:
When a pattern starts with a File.separator, the string to match must also start with a File.separator. When a pattern does not start with a File.separator, the string to match may not start with a File.separator. When one of these rules is not obeyed, the string will not match.

When a name path segment is matched against a pattern path segment, the following special characters can be used:
'*' matches zero or more characters
'?' matches one character.

Examples:
• "**\*.class" matches all .class files/dirs in a directory tree.
• "test\a??.java" matches all files/dirs which start with an 'a', then two more characters and then ".java", in a directory called test.
• "**" matches everything in a directory tree.
• "**\test\**\XYZ*" matches all files/dirs which start with "XYZ" and where there is a parent directory called test (e.g. "abc\test\def\ghi\XYZ123").

Case sensitivity may be turned off if necessary. By default, it is turned on.

Example of usage:
 String[] includes = { "**\\*.class" };
String[] excludes = { "modules\\*\\**" };
ds.setIncludes( includes );
ds.setExcludes( excludes );
ds.setBasedir( new File( "test" ) );
ds.setCaseSensitive( true );
ds.scan();

System.out.println( "FILES:" );
String[] files = ds.getIncludedFiles();
for ( int i = 0; i < files.length; i++ )
{
System.out.println( files[i] );
}


This will scan a directory called test for .class files, but excludes all files in all proper subdirectories of a directory called "modules"

Author:
Arnout J. Kuiper ajkuiper@wxs.nl, Magesh Umasankar, Bruce Atherton, Antoine Levy-Lambert
• ### Field Summary

Fields
Modifier and Type Field Description
protected File basedir
The base directory to be scanned.
protected ArrayList<String> dirsDeselected
The directories which matched at least one include and no excludes but which a selector discarded.
protected ArrayList<String> dirsExcluded
The directories which matched at least one include and at least one exclude.
protected ArrayList<String> dirsIncluded
The directories which matched at least one include and no excludes and were selected.
protected ArrayList<String> dirsNotIncluded
The directories which were found and did not match any includes.
protected boolean everythingIncluded
Whether or not everything tested so far has been included.
protected ArrayList<String> filesDeselected
The files which matched at least one include and no excludes and which a selector discarded.
protected ArrayList<String> filesExcluded
The files which matched at least one include and at least one exclude.
protected ArrayList<String> filesIncluded
The files which matched at least one include and no excludes and were selected.
protected ArrayList<String> filesNotIncluded
The files which did not match any includes or selectors.
protected boolean haveSlowResults
Whether or not our results were built by a slow scan.
• ### Fields inherited from class org.codehaus.plexus.util.AbstractScanner

DEFAULTEXCLUDES, excludes, filenameComparator, includes, isCaseSensitive
• ### Constructor Summary

Constructors
Constructor Description
DirectoryScanner()
Sole constructor.
• ### Method Summary

All Methods
Modifier and Type Method Description
File getBasedir()
Returns the base directory to be scanned.
String[] getDeselectedDirectories()
Returns the names of the directories which were selected out and therefore not ultimately included.
String[] getDeselectedFiles()
Returns the names of the files which were selected out and therefore not ultimately included.
String[] getExcludedDirectories()
Returns the names of the directories which matched at least one of the include patterns and at least one of the exclude patterns.
String[] getExcludedFiles()
Returns the names of the files which matched at least one of the include patterns and at least one of the exclude patterns.
String[] getIncludedDirectories()
Returns the names of the directories which matched at least one of the include patterns and none of the exclude patterns.
String[] getIncludedFiles()
Returns the names of the files which matched at least one of the include patterns and none of the exclude patterns.
String[] getNotIncludedDirectories()
Returns the names of the directories which matched none of the include patterns.
String[] getNotIncludedFiles()
Returns the names of the files which matched none of the include patterns.
boolean isEverythingIncluded()
Returns whether or not the scanner has included all the files or directories it has come across so far.
boolean isParentSymbolicLink​(File parent, String name)
Checks whether the parent of this file is a symbolic link.
protected boolean isSelected​(String name, File file)
Tests whether a name should be selected.
boolean isSymbolicLink​(File parent, String name)
Checks whether a given file is a symbolic link.
void scan()
Scans the base directory for files which match at least one include pattern and don't match any exclude patterns.
protected void scandir​(File dir, String vpath, boolean fast)
Scans the given directory for files and directories.
void setBasedir​(File basedir)
Sets the base directory to be scanned.
void setBasedir​(String basedir)
Sets the base directory to be scanned.
void setFollowSymlinks​(boolean followSymlinks)
Sets whether or not symbolic links should be followed.
protected void slowScan()
Top level invocation for a slow scan.
• ### Methods inherited from class org.codehaus.plexus.util.AbstractScanner

addDefaultExcludes, couldHoldIncluded, isExcluded, isExcluded, isExcluded, isIncluded, isIncluded, isIncluded, match, match, matchPath, matchPath, matchPatternStart, matchPatternStart, setCaseSensitive, setExcludes, setFilenameComparator, setIncludes, setupDefaultFilters, setupMatchPatterns
• ### Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
• ### Field Detail

• #### basedir

protected File basedir
The base directory to be scanned.
• #### filesIncluded

protected ArrayList<String> filesIncluded
The files which matched at least one include and no excludes and were selected.
• #### filesNotIncluded

protected ArrayList<String> filesNotIncluded
The files which did not match any includes or selectors.
• #### filesExcluded

protected ArrayList<String> filesExcluded
The files which matched at least one include and at least one exclude.
• #### dirsIncluded

protected ArrayList<String> dirsIncluded
The directories which matched at least one include and no excludes and were selected.
• #### dirsNotIncluded

protected ArrayList<String> dirsNotIncluded
The directories which were found and did not match any includes.
• #### dirsExcluded

protected ArrayList<String> dirsExcluded
The directories which matched at least one include and at least one exclude.
• #### filesDeselected

protected ArrayList<String> filesDeselected
The files which matched at least one include and no excludes and which a selector discarded.
• #### dirsDeselected

protected ArrayList<String> dirsDeselected
The directories which matched at least one include and no excludes but which a selector discarded.
• #### haveSlowResults

protected boolean haveSlowResults
Whether or not our results were built by a slow scan.
• #### everythingIncluded

protected boolean everythingIncluded
Whether or not everything tested so far has been included.
• ### Constructor Detail

• #### DirectoryScanner

public DirectoryScanner()
Sole constructor.
• ### Method Detail

• #### setBasedir

public void setBasedir​(String basedir)
Sets the base directory to be scanned. This is the directory which is scanned recursively. All '/' and '\' characters are replaced by File.separatorChar, so the separator used need not match File.separatorChar.
Parameters:
basedir - The base directory to scan. Must not be null.
• #### setBasedir

public void setBasedir​(File basedir)
Sets the base directory to be scanned. This is the directory which is scanned recursively.
Parameters:
basedir - The base directory for scanning. Should not be null.
• #### getBasedir

public File getBasedir()
Returns the base directory to be scanned. This is the directory which is scanned recursively.
Returns:
the base directory to be scanned

public void setFollowSymlinks​(boolean followSymlinks)
Sets whether or not symbolic links should be followed.
Parameters:
followSymlinks - whether or not symbolic links should be followed
• #### isEverythingIncluded

public boolean isEverythingIncluded()
Returns whether or not the scanner has included all the files or directories it has come across so far.
Returns:
true if all files and directories which have been found so far have been included.
• #### scan

public void scan()
throws IllegalStateException
Scans the base directory for files which match at least one include pattern and don't match any exclude patterns. If there are selectors then the files must pass muster there, as well.
Throws:
IllegalStateException - if the base directory was set incorrectly (i.e. if it is null, doesn't exist, or isn't a directory).
• #### slowScan

protected void slowScan()

Top level invocation for a slow scan. A slow scan builds up a full list of excluded/included files/directories, whereas a fast scan will only have full results for included files, as it ignores directories which can't possibly hold any included files/directories.

Returns immediately if a slow scan has already been completed.

• #### isSelected

protected boolean isSelected​(String name,
File file)
Tests whether a name should be selected.
Parameters:
name - the filename to check for selecting
file - the java.io.File object for this filename
Returns:
false when the selectors says that the file should not be selected, true otherwise.
• #### getIncludedFiles

public String[] getIncludedFiles()
Returns the names of the files which matched at least one of the include patterns and none of the exclude patterns. The names are relative to the base directory.
Returns:
the names of the files which matched at least one of the include patterns and none of the exclude patterns.
• #### getNotIncludedFiles

public String[] getNotIncludedFiles()
Returns the names of the files which matched none of the include patterns. The names are relative to the base directory. This involves performing a slow scan if one has not already been completed.
Returns:
the names of the files which matched none of the include patterns.
slowScan()
• #### getExcludedFiles

public String[] getExcludedFiles()
Returns the names of the files which matched at least one of the include patterns and at least one of the exclude patterns. The names are relative to the base directory. This involves performing a slow scan if one has not already been completed.
Returns:
the names of the files which matched at least one of the include patterns and at at least one of the exclude patterns.
slowScan()
• #### getDeselectedFiles

public String[] getDeselectedFiles()

Returns the names of the files which were selected out and therefore not ultimately included.

The names are relative to the base directory. This involves performing a slow scan if one has not already been completed.

Returns:
the names of the files which were deselected.
slowScan()
• #### getIncludedDirectories

public String[] getIncludedDirectories()
Returns the names of the directories which matched at least one of the include patterns and none of the exclude patterns. The names are relative to the base directory.
Returns:
the names of the directories which matched at least one of the include patterns and none of the exclude patterns.
• #### getNotIncludedDirectories

public String[] getNotIncludedDirectories()
Returns the names of the directories which matched none of the include patterns. The names are relative to the base directory. This involves performing a slow scan if one has not already been completed.
Returns:
the names of the directories which matched none of the include patterns.
slowScan()
• #### getExcludedDirectories

public String[] getExcludedDirectories()
Returns the names of the directories which matched at least one of the include patterns and at least one of the exclude patterns. The names are relative to the base directory. This involves performing a slow scan if one has not already been completed.
Returns:
the names of the directories which matched at least one of the include patterns and at least one of the exclude patterns.
slowScan()
• #### getDeselectedDirectories

public String[] getDeselectedDirectories()

Returns the names of the directories which were selected out and therefore not ultimately included.

The names are relative to the base directory. This involves performing a slow scan if one has not already been completed.

Returns:
the names of the directories which were deselected.
slowScan()

public boolean isSymbolicLink​(File parent,
String name)
throws IOException

Checks whether a given file is a symbolic link.

It doesn't really test for symbolic links but whether the canonical and absolute paths of the file are identical - this may lead to false positives on some platforms.

Parameters:
parent - the parent directory of the file to test
name - the name of the file to test.
Returns:
true if it's a symbolic link
Throws:
IOException - .
Since:
Ant 1.5

public boolean isParentSymbolicLink​(File parent,
String name)
throws IOException

Checks whether the parent of this file is a symbolic link.

For java versions prior to 7 It doesn't really test for symbolic links but whether the canonical and absolute paths of the file are identical - this may lead to false positives on some platforms.

Parameters:
parent - the parent directory of the file to test
name - the name of the file to test.
Returns:
true if it's a symbolic link
Throws:
IOException - .
Since:
Ant 1.5