org.repoweb.model.file.util
Class DirectoryScanner

java.lang.Object
  org.repoweb.model.file.util.DirectoryScanner

public class DirectoryScanner

extends java.lang.Object

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();

   LOG.info("FILES:");
   String[] files = ds.getIncludedFiles();
   for (int i = 0; i < files.length; i++) {
     LOG.info(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

Constructor Summary

DirectoryScanner()
Sole constructor.

Method Summary

void	addDefaultExcludes() Adds default exclusions to the current exclusions set.
java.io.File	getBasedir() Returns the base directory to be scanned.
java.lang.String[]	getDeselectedDirectories() Returns the names of the directories which were selected out and therefore not ultimately included.
java.lang.String[]	getDeselectedFiles() Returns the names of the files which were selected out and therefore not ultimately included.
java.lang.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.
java.lang.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.
java.io.File[]	getIncludedDirectories() Returns the names of the directories which matched at least one of the include patterns and none of the exclude patterns.
java.io.File[]	getIncludedFiles() Returns the names of the files which matched at least one of the include patterns and none of the exclude patterns.
java.lang.String[]	getNotIncludedDirectories() Returns the names of the directories which matched none of the include patterns.
java.lang.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.
void	scan() Scans the base directory for files which match at least one include pattern and don't match any exclude patterns.
void	setBasedir(java.io.File basedir) Sets the base directory to be scanned.
void	setBasedir(java.lang.String basedir) Sets the base directory to be scanned.
void	setCaseSensitive(boolean isCaseSensitive) Sets whether or not the file system should be regarded as case sensitive.
void	setExcludes(java.lang.String[] excludes) Sets the list of exclude patterns to use.
void	setFollowSymlinks(boolean followSymlinks) Sets whether or not symbolic links should be followed.
void	setIncludes(java.lang.String[] includes) Sets the list of include patterns to use.
void	setSelectors(java.io.FileFilter[] selectors) Sets the selectors that will select the filelist.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DirectoryScanner

public DirectoryScanner()

Sole constructor.

Method Detail

setBasedir

public void setBasedir(java.lang.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(java.io.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 java.io.File getBasedir()

Returns the base directory to be scanned. This is the directory which is scanned recursively.

Returns:

the base directory to be scanned

setCaseSensitive

public void setCaseSensitive(boolean isCaseSensitive)

Sets whether or not the file system should be regarded as case sensitive.

Parameters:

isCaseSensitive - whether or not the file system should be regarded as a case sensitive one

setFollowSymlinks

public void setFollowSymlinks(boolean followSymlinks)

Sets whether or not symbolic links should be followed.

Parameters:

followSymlinks - whether or not symbolic links should be followed

setIncludes

public void setIncludes(java.lang.String[] includes)

Sets the list of include patterns to use. All '/' and '\' characters are replaced by File.separatorChar, so the separator used need not match File.separatorChar.

When a pattern ends with a '/' or '\', "**" is appended.

Parameters:

includes - A list of include patterns. May be null, indicating that all files should be included. If a non-null list is given, all elements must be non-null.

setExcludes

public void setExcludes(java.lang.String[] excludes)

Sets the list of exclude patterns to use. All '/' and '\' characters are replaced by File.separatorChar, so the separator used need not match File.separatorChar.

When a pattern ends with a '/' or '\', "**" is appended.

Parameters:

excludes - A list of exclude patterns. May be null, indicating that no files should be excluded. If a non-null list is given, all elements must be non-null.

setSelectors

public void setSelectors(java.io.FileFilter[] selectors)

Sets the selectors that will select the filelist.

Parameters:

selectors - specifies the selectors to be invoked on a scan

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()

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:

ScanException - if the base directory was set incorrectly (i.e. if it is null, doesn't exist, or isn't a directory).

getIncludedFiles

public java.io.File[] 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 java.lang.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.

getExcludedFiles

public java.lang.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.

getDeselectedFiles

public java.lang.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.

getIncludedDirectories

public java.io.File[] 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 java.lang.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.

getExcludedDirectories

public java.lang.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.

getDeselectedDirectories

public java.lang.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.

addDefaultExcludes

public void addDefaultExcludes()

Adds default exclusions to the current exclusions set.