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 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
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package org.codehaus.plexus.util;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Vector;

/**
 * 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 * [email protected] * @author Magesh Umasankar * @author Bruce Atherton * @author Antoine Levy-Lambert */ public class DirectoryScanner extends AbstractScanner { /** * The base directory to be scanned. */ protected File basedir; /** * The files which matched at least one include and no excludes * and were selected. */ protected Vector filesIncluded; /** * The files which did not match any includes or selectors. */ protected Vector filesNotIncluded; /** * The files which matched at least one include and at least * one exclude. */ protected Vector filesExcluded; /** * The directories which matched at least one include and no excludes * and were selected. */ protected Vector dirsIncluded; /** * The directories which were found and did not match any includes. */ protected Vector dirsNotIncluded; /** * The directories which matched at least one include and at least one * exclude. */ protected Vector dirsExcluded; /** * The files which matched at least one include and no excludes and * which a selector discarded. */ protected Vector filesDeselected; /** * The directories which matched at least one include and no excludes * but which a selector discarded. */ protected Vector dirsDeselected; /** * Whether or not our results were built by a slow scan. */ protected boolean haveSlowResults = false; /** * Whether or not symbolic links should be followed. * * @since Ant 1.5 */ private boolean followSymlinks = true; /** * Whether or not everything tested so far has been included. */ protected boolean everythingIncluded = true; private final String[] tokenizedEmpty = MatchPattern.tokenizePathToString( "", File.separator ); /** * Sole constructor. */ public DirectoryScanner() { } /** * 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. * * @param basedir The base directory to scan. * Must not be null. */ public void setBasedir( String basedir ) { setBasedir( new File( basedir.replace( '/', File.separatorChar ).replace( '\\', File.separatorChar ) ) ); } /** * Sets the base directory to be scanned. This is the directory which is * scanned recursively. * * @param basedir The base directory for scanning. * Should not be null. */ public void setBasedir( File basedir ) { this.basedir = basedir; } /** * Returns the base directory to be scanned. * This is the directory which is scanned recursively. * * @return the base directory to be scanned */ public File getBasedir() { return basedir; } /** * Sets whether or not symbolic links should be followed. * * @param followSymlinks whether or not symbolic links should be followed */ public void setFollowSymlinks( boolean followSymlinks ) { this.followSymlinks = followSymlinks; } /** * Returns whether or not the scanner has included all the files or * directories it has come across so far. * * @return true if all files and directories which have * been found so far have been included. */ public boolean isEverythingIncluded() { return everythingIncluded; } /** * 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). */ public void scan() throws IllegalStateException { if ( basedir == null ) { throw new IllegalStateException( "No basedir set" ); } if ( !basedir.exists() ) { throw new IllegalStateException( "basedir " + basedir + " does not exist" ); } if ( !basedir.isDirectory() ) { throw new IllegalStateException( "basedir " + basedir + " is not a directory" ); } setupDefaultFilters(); setupMatchPatterns(); filesIncluded = new Vector(); filesNotIncluded = new Vector(); filesExcluded = new Vector(); filesDeselected = new Vector(); dirsIncluded = new Vector(); dirsNotIncluded = new Vector(); dirsExcluded = new Vector(); dirsDeselected = new Vector(); if ( isIncluded( "", tokenizedEmpty ) ) { if ( !isExcluded( "", tokenizedEmpty ) ) { if ( isSelected( "", basedir ) ) { dirsIncluded.addElement( "" ); } else { dirsDeselected.addElement( "" ); } } else { dirsExcluded.addElement( "" ); } } else { dirsNotIncluded.addElement( "" ); } scandir( basedir, "", true ); } /** * 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. */ protected void slowScan() { if ( haveSlowResults ) { return; } String[] excl = new String[dirsExcluded.size()]; dirsExcluded.copyInto( excl ); String[] notIncl = new String[dirsNotIncluded.size()]; dirsNotIncluded.copyInto( notIncl ); for ( String anExcl : excl ) { if ( !couldHoldIncluded( anExcl ) ) { scandir( new File( basedir, anExcl ), anExcl + File.separator, false ); } } for ( String aNotIncl : notIncl ) { if ( !couldHoldIncluded( aNotIncl ) ) { scandir( new File( basedir, aNotIncl ), aNotIncl + File.separator, false ); } } haveSlowResults = true; } /** * Scans the given directory for files and directories. Found files and * directories are placed in their respective collections, based on the * matching of includes, excludes, and the selectors. When a directory * is found, it is scanned recursively. * * @param dir The directory to scan. Must not be null. * @param vpath The path relative to the base directory (needed to * prevent problems with an absolute path when using * dir). Must not be null. * @param fast Whether or not this call is part of a fast scan. * @see #filesIncluded * @see #filesNotIncluded * @see #filesExcluded * @see #dirsIncluded * @see #dirsNotIncluded * @see #dirsExcluded * @see #slowScan */ protected void scandir( File dir, String vpath, boolean fast ) { String[] newfiles = dir.list(); if ( newfiles == null ) { /* * two reasons are mentioned in the API docs for File.list * (1) dir is not a directory. This is impossible as * we wouldn't get here in this case. * (2) an IO error occurred (why doesn't it throw an exception * then???) */ /* * [jdcasey] (2) is apparently happening to me, as this is killing one of my tests... * this is affecting the assembly plugin, fwiw. I will initialize the newfiles array as * zero-length for now. * * NOTE: I can't find the problematic code, as it appears to come from a native method * in UnixFileSystem... */ /* * [bentmann] A null array will also be returned from list() on NTFS when dir refers to a soft link or * junction point whose target is not existent. */ newfiles = new String[0]; // throw new IOException( "IO error scanning directory " + dir.getAbsolutePath() ); } if ( !followSymlinks ) { ArrayList noLinks = new ArrayList(); for ( String newfile : newfiles ) { try { if ( isSymbolicLink( dir, newfile ) ) { String name = vpath + newfile; File file = new File( dir, newfile ); if ( file.isDirectory() ) { dirsExcluded.addElement( name ); } else { filesExcluded.addElement( name ); } } else { noLinks.add( newfile ); } } catch ( IOException ioe ) { String msg = "IOException caught while checking " + "for links, couldn't get cannonical path!"; // will be caught and redirected to Ant's logging system System.err.println( msg ); noLinks.add( newfile ); } } newfiles = noLinks.toArray(new String[noLinks.size()]); } for ( String newfile : newfiles ) { String name = vpath + newfile; String[] tokenizedName = MatchPattern.tokenizePathToString( name, File.separator ); File file = new File( dir, newfile ); if ( file.isDirectory() ) { if ( isIncluded( name, tokenizedName ) ) { if ( !isExcluded( name, tokenizedName ) ) { if ( isSelected( name, file ) ) { dirsIncluded.addElement( name ); if ( fast ) { scandir( file, name + File.separator, fast ); } } else { everythingIncluded = false; dirsDeselected.addElement( name ); if ( fast && couldHoldIncluded( name ) ) { scandir( file, name + File.separator, fast ); } } } else { everythingIncluded = false; dirsExcluded.addElement( name ); if ( fast && couldHoldIncluded( name ) ) { scandir( file, name + File.separator, fast ); } } } else { everythingIncluded = false; dirsNotIncluded.addElement( name ); if ( fast && couldHoldIncluded( name ) ) { scandir( file, name + File.separator, fast ); } } if ( !fast ) { scandir( file, name + File.separator, fast ); } } else if ( file.isFile() ) { if ( isIncluded( name, tokenizedName ) ) { if ( !isExcluded( name, tokenizedName ) ) { if ( isSelected( name, file ) ) { filesIncluded.addElement( name ); } else { everythingIncluded = false; filesDeselected.addElement( name ); } } else { everythingIncluded = false; filesExcluded.addElement( name ); } } else { everythingIncluded = false; filesNotIncluded.addElement( name ); } } } } /** * Tests whether a name should be selected. * * @param name the filename to check for selecting * @param file the java.io.File object for this filename * @return false when the selectors says that the file * should not be selected, true otherwise. */ protected boolean isSelected( String name, File file ) { return true; } /** * 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. * * @return the names of the files which matched at least one of the * include patterns and none of the exclude patterns. */ public String[] getIncludedFiles() { String[] files = new String[filesIncluded.size()]; filesIncluded.copyInto( files ); return files; } /** * 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. * * @return the names of the files which matched none of the include * patterns. * @see #slowScan */ public String[] getNotIncludedFiles() { slowScan(); String[] files = new String[filesNotIncluded.size()]; filesNotIncluded.copyInto( files ); return files; } /** * 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. * * @return the names of the files which matched at least one of the * include patterns and at at least one of the exclude patterns. * @see #slowScan */ public String[] getExcludedFiles() { slowScan(); String[] files = new String[filesExcluded.size()]; filesExcluded.copyInto( files ); return files; } /** *

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.

* * @return the names of the files which were deselected. * @see #slowScan */ public String[] getDeselectedFiles() { slowScan(); String[] files = new String[filesDeselected.size()]; filesDeselected.copyInto( files ); return files; } /** * 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. * * @return the names of the directories which matched at least one of the * include patterns and none of the exclude patterns. */ public String[] getIncludedDirectories() { String[] directories = new String[dirsIncluded.size()]; dirsIncluded.copyInto( directories ); return directories; } /** * 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. * * @return the names of the directories which matched none of the include * patterns. * @see #slowScan */ public String[] getNotIncludedDirectories() { slowScan(); String[] directories = new String[dirsNotIncluded.size()]; dirsNotIncluded.copyInto( directories ); return directories; } /** * 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. * * @return the names of the directories which matched at least one of the * include patterns and at least one of the exclude patterns. * @see #slowScan */ public String[] getExcludedDirectories() { slowScan(); String[] directories = new String[dirsExcluded.size()]; dirsExcluded.copyInto( directories ); return directories; } /** *

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.

* * @return the names of the directories which were deselected. * @see #slowScan */ public String[] getDeselectedDirectories() { slowScan(); String[] directories = new String[dirsDeselected.size()]; dirsDeselected.copyInto( directories ); return directories; } /** * 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.

* * @param parent the parent directory of the file to test * @param name the name of the file to test. * @return true if it's a symbolic link * @throws java.io.IOException . * @since Ant 1.5 */ public boolean isSymbolicLink( File parent, String name ) throws IOException { if ( Java7Detector.isJava7() ) { return Java7FileUtil.isSymLink( new File( parent, name ) ); } File resolvedParent = new File( parent.getCanonicalPath() ); File toTest = new File( resolvedParent, name ); return !toTest.getAbsolutePath().equals( toTest.getCanonicalPath() ); } }




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