java.lang.Object
- org.apache.maven.plugins.javadoc.JavadocUtil

```
public class JavadocUtil
extends Object
```
Set of utilities methods for Javadoc.

Since:

2.4

Author:

Vincent Siveton

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`protected static class`	`JavadocUtil.JavadocOutputStreamConsumer`	Ignores line like 'Picked up JAVA_TOOL_OPTIONS: ...' as can happen on CI servers.

Field Summary

Fields
Modifier and Type	Field	Description
`static int`	`DEFAULT_TIMEOUT`	The default timeout used when fetching url, i.e.
`protected static String`	`ERROR_INIT_VM`	Error message when VM could not be started using invoker.

Constructor Summary

Constructors
Constructor Description

JavadocUtil()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`protected static void`	`copyJavadocResources(File outputDirectory, File javadocDir, String excludedocfilessubdir)`	Convenience method that copy all `doc-files` directories from `javadocDir` to the `outputDirectory`.
`protected static void`	`copyResource(URL url, File file)`	Copy the given url to the given file.
`protected static String`	`extractJavadocVersion(String output)`	Parse the output for 'javadoc -J-version' and return the javadoc version recognized.
`protected static Collection<String>`	`getExcludedPackages(Path sourceDirectory, Collection<String> excludePackagenames)`	Method that gets the complete package names (including subpackages) of the packages that were defined in the excludePackageNames parameter.
`protected static List<String>`	`getExcludedPackages(Collection<Path> sourcePaths, Collection<String> excludedPackages)`	Method that gets all the source files to be excluded from the javadoc on the given source paths.
`protected static List<String>`	`getFilesFromSource(File sourceDirectory, List<String> sourceFileIncludes, List<String> sourceFileExcludes, Collection<String> excludePackages)`	Convenience method that gets the files to be included in the javadoc.
`protected static List<String>`	`getIncludedFiles(File sourceDirectory, String[] fileList, Collection<String> excludePackages)`	Method that gets the files or classes that would be included in the javadocs using the subpackages parameter.
`protected static org.codehaus.plexus.languages.java.version.JavaVersion`	`getJavadocVersion(File javadocExe)`	Call the Javadoc tool and parse its output to find its version, i.e.:
`protected static URL`	`getRedirectUrl(URL url, org.apache.maven.settings.Settings settings)`	Execute an HTTP request to the given URL, follow redirects, and return the last redirect location.
`protected static List<String>`	`getTagletClassNames(File jarFile)`	Auto-detect the class names of the implementation of `com.sun.tools.doclets.Taglet` class from a given jar file.
`protected static void`	`invokeMaven(org.apache.maven.plugin.logging.Log log, File localRepositoryDir, File projectFile, List<String> goals, Properties properties, File invokerLog, File globalSettingsFile)`	Invoke Maven for the given project file with a list of goals and properties, the output will be in the invokerlog file.
`static boolean`	`isEmpty(Collection<?> collection)`	Convenience method to determine that a collection is empty or null.
`static boolean`	`isNotEmpty(Collection<?> collection)`	Convenience method to determine that a collection is not empty or null.
`protected static boolean`	`isValidElementList(URL url, org.apache.maven.settings.Settings settings, boolean validateContent)`
`protected static boolean`	`isValidPackageList(URL url, org.apache.maven.settings.Settings settings, boolean validateContent)`	Validates an `URL` to point to a valid `package-list` resource.
`protected static String`	`parseJavadocMemory(String memory)`	Parse a memory string which be used in the JVM arguments `-Xms` or `-Xmx`.
`static Collection<Path>`	`pruneDirs(org.apache.maven.project.MavenProject project, Collection<String> dirs)`	Method that removes the invalid directories in the specified directories.
`protected static List<String>`	`pruneFiles(Collection<String> files)`	Method that removes the invalid files in the specified files.
`protected static String`	`quotedArgument(String value)`	Convenience method to wrap a command line option-argument in single quotes (i.e.
`protected static String`	`quotedPathArgument(String value)`	Convenience method to format a path argument so that it is properly interpreted by the javadoc tool.
`protected static String`	`readFile(File javaFile, String encoding)`	Read the given file and return the content or null if an IOException occurs.
`static boolean`	`shouldPruneFile(String f, List<String> pruned)`	Determine whether a file should be excluded from the provided list of paths, based on whether it exists and is already present in the list.
`protected static String[]`	`splitPath(String path)`	Split the given path with colon and semi-colon, to support Solaris and Windows path.
`static String`	`toRelative(File basedir, String absolutePath)`
`protected static String`	`unifyPathSeparator(String path)`	Unify the given path with the current System path separator, to be platform independent.
`protected static boolean`	`validateEncoding(String charsetName)`	Validate if a charset is supported on this platform.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail
- DEFAULT_TIMEOUT
```
public static final int DEFAULT_TIMEOUT
```
  The default timeout used when fetching url, i.e. 2000.
  
  See Also:
  
  Constant Field Values
- ERROR_INIT_VM
```
protected static final String ERROR_INIT_VM
```
  Error message when VM could not be started using invoker.
  
  See Also:
  
  Constant Field Values

Constructor Detail
- JavadocUtil
```
public JavadocUtil()
```

Method Detail

pruneDirs
```
public static Collection<Path> pruneDirs(org.apache.maven.project.MavenProject project,
                                         Collection<String> dirs)
```
Method that removes the invalid directories in the specified directories. Note: All elements in dirs could be an absolute or relative against the project's base directory String path.

Parameters:

project - the current Maven project not null

dirs - the collection of String directories path that will be validated.

Returns:

a List of valid String directories absolute paths.

pruneFiles
```
protected static List<String> pruneFiles(Collection<String> files)
```
Method that removes the invalid files in the specified files. Note: All elements in files should be an absolute String path.

Parameters:

files - the list of String files paths that will be validated.

Returns:

a List of valid File objects.

shouldPruneFile
```
public static boolean shouldPruneFile(String f,
                                      List<String> pruned)
```
Determine whether a file should be excluded from the provided list of paths, based on whether it exists and is already present in the list.

Parameters:

f - The files.

pruned - The list of pruned files..

Returns:

true if the file could be pruned false otherwise.

getExcludedPackages
```
protected static List<String> getExcludedPackages(Collection<Path> sourcePaths,
                                                  Collection<String> excludedPackages)
```
Method that gets all the source files to be excluded from the javadoc on the given source paths.

Parameters:

sourcePaths - the path to the source files

excludedPackages - the package names to be excluded in the javadoc

Returns:

a List of the packages to be excluded in the generated javadoc

quotedArgument
```
protected static String quotedArgument(String value)
```
Convenience method to wrap a command line option-argument in single quotes (i.e. '). Intended for values which may contain whitespace.
Line feeds (i.e. \n) are replaced with spaces, and single quotes are backslash escaped.

Parameters:

value - the option-argument

Returns:

quoted option-argument

quotedPathArgument
```
protected static String quotedPathArgument(String value)
```
Convenience method to format a path argument so that it is properly interpreted by the javadoc tool. Intended for path values which may contain whitespaces.

Parameters:

value - the argument value.

Returns:

path argument with quote

copyJavadocResources

protected static void copyJavadocResources(File outputDirectory,
                                           File javadocDir,
                                           String excludedocfilessubdir)
                                    throws IOException

Convenience method that copy all doc-files directories from javadocDir to the outputDirectory.

Parameters:: outputDirectory - the output directory; javadocDir - the javadoc directory; excludedocfilessubdir - the excludedocfilessubdir parameter
Throws:: IOException - if any
Since:: 2.5

getIncludedFiles
```
protected static List<String> getIncludedFiles(File sourceDirectory,
                                               String[] fileList,
                                               Collection<String> excludePackages)
```
Method that gets the files or classes that would be included in the javadocs using the subpackages parameter.

Parameters:

sourceDirectory - the directory where the source files are located

fileList - the list of all relative files found in the sourceDirectory

excludePackages - package names to be excluded in the javadoc

Returns:

a StringBuilder that contains the appended file names of the files to be included in the javadoc

getExcludedPackages
```
protected static Collection<String> getExcludedPackages(Path sourceDirectory,
                                                        Collection<String> excludePackagenames)
```
Method that gets the complete package names (including subpackages) of the packages that were defined in the excludePackageNames parameter.

Parameters:

sourceDirectory - the directory where the source files are located

excludePackagenames - package names to be excluded in the javadoc

Returns:

a List of the packagenames to be excluded

getFilesFromSource

protected static List<String> getFilesFromSource(File sourceDirectory,
                                                 List<String> sourceFileIncludes,
                                                 List<String> sourceFileExcludes,
                                                 Collection<String> excludePackages)

Convenience method that gets the files to be included in the javadoc.

Parameters:: sourceDirectory - the directory where the source files are located; sourceFileIncludes - files to include; sourceFileExcludes - files to exclude; excludePackages - packages to be excluded from the javadocs
Returns:: the files from which javadoc should be generated

getJavadocVersion

protected static org.codehaus.plexus.languages.java.version.JavaVersion getJavadocVersion(File javadocExe)
                                                                                   throws IOException,
                                                                                          org.codehaus.plexus.util.cli.CommandLineException,
                                                                                          IllegalArgumentException

Call the Javadoc tool and parse its output to find its version, i.e.:

 javadoc.exe( or.sh ) - J - version

Parameters:: javadocExe - not null file
Returns:: the javadoc version as float
Throws:: IOException - if javadocExe is null, doesn't exist or is not a file; org.codehaus.plexus.util.cli.CommandLineException - if any; IllegalArgumentException - if no output was found in the command line; PatternSyntaxException - if the output contains a syntax error in the regular-expression pattern.
See Also:: extractJavadocVersion(String)

extractJavadocVersion

protected static String extractJavadocVersion(String output)
                                       throws IllegalArgumentException

Parse the output for 'javadoc -J-version' and return the javadoc version recognized.
Here are some output for 'javadoc -J-version' depending the JDK used:

Output for 'javadoc -J-version' per JDK
JDK	Output for 'javadoc -J-version'
Sun 1.4	java full version "1.4.2_12-b03"
Sun 1.5	java full version "1.5.0_07-164"
IBM 1.4	javadoc full version "J2RE 1.4.2 IBM Windows 32 build cn1420-20040626"
IBM 1.5 (French JVM)	javadoc version complète de "J2RE 1.5.0 IBM Windows 32 build pwi32pdev-20070426a"
FreeBSD 1.5	java full version "diablo-1.5.0-b01"
BEA jrockit 1.5	java full version "1.5.0_11-b03"

Parameters:: output - for 'javadoc -J-version'
Returns:: the version of the javadoc for the output, only digits and dots
Throws:: PatternSyntaxException - if the output doesn't match with the output pattern (?s).*?[^a-zA-Z]([0-9]+\\.?[0-9]*)(\\.([0-9]+))?.*.; IllegalArgumentException - if the output is null

parseJavadocMemory

protected static String parseJavadocMemory(String memory)
                                    throws IllegalArgumentException

Parse a memory string which be used in the JVM arguments -Xms or -Xmx.
Here are some supported memory string depending the JDK used:

Memory argument support per JDK
JDK	Memory argument support for `-Xms` or `-Xmx`
SUN	1024k \| 128m \| 1g \| 1t
IBM	1024k \| 1024b \| 128m \| 128mb \| 1g \| 1gb
BEA	1024k \| 1024kb \| 128m \| 128mb \| 1g \| 1gb

Parameters:: memory - the memory to be parsed, not null.
Returns:: the memory parsed with a supported unit. If no unit specified in the memory parameter, the default unit is m. The units g | gb or t | tb will be converted in m.
Throws:: IllegalArgumentException - if the memory parameter is null or doesn't match any pattern.

validateEncoding
```
protected static boolean validateEncoding(String charsetName)
```
Validate if a charset is supported on this platform.

Parameters:

charsetName - the charsetName to be check.

Returns:

true if the given charset is supported by the JVM, false otherwise.

getTagletClassNames
```
protected static List<String> getTagletClassNames(File jarFile)
                                           throws IOException,
                                                  ClassNotFoundException,
                                                  NoClassDefFoundError
```
Auto-detect the class names of the implementation of com.sun.tools.doclets.Taglet class from a given jar file.
Note: JAVA_HOME/lib/tools.jar is a requirement to find com.sun.tools.doclets.Taglet class.

Parameters:

jarFile - not null

Returns:

the list of com.sun.tools.doclets.Taglet class names from a given jarFile.

Throws:

IOException - if jarFile is invalid or not found, or if the JAVA_HOME/lib/tools.jar is not found.

ClassNotFoundException - if any

NoClassDefFoundError - if any

copyResource

protected static void copyResource(URL url,
                                   File file)
                            throws IOException

Copy the given url to the given file.

Parameters:: url - not null url; file - not null file where the url will be created
Throws:: IOException - if any
Since:: 2.6

invokeMaven

protected static void invokeMaven(org.apache.maven.plugin.logging.Log log,
                                  File localRepositoryDir,
                                  File projectFile,
                                  List<String> goals,
                                  Properties properties,
                                  File invokerLog,
                                  File globalSettingsFile)
                           throws org.apache.maven.shared.invoker.MavenInvocationException

Invoke Maven for the given project file with a list of goals and properties, the output will be in the invokerlog file.
Note: the Maven Home should be defined in the maven.home Java system property or defined in M2_HOME system env variables.

Parameters:: log - a logger could be null.; localRepositoryDir - the localRepository not null.; projectFile - a not null project file.; goals - a not null goals list.; properties - the properties for the goals, could be null.; invokerLog - the log file where the invoker will be written, if null using System.out.; globalSettingsFile - reference to settings file, could be null.
Throws:: org.apache.maven.shared.invoker.MavenInvocationException - if any
Since:: 2.6

readFile
```
protected static String readFile(File javaFile,
                                 String encoding)
```
Read the given file and return the content or null if an IOException occurs.

Parameters:

javaFile - not null

encoding - could be null

Returns:

the content with unified line separator of the given javaFile using the given encoding.

Since:

2.6.1

See Also:

FileUtils.fileRead(File, String)

splitPath
```
protected static String[] splitPath(String path)
```
Split the given path with colon and semi-colon, to support Solaris and Windows path. Examples:
```
 splitPath( "/home:/tmp" )     = ["/home", "/tmp"]
 splitPath( "/home;/tmp" )     = ["/home", "/tmp"]
 splitPath( "C:/home:C:/tmp" ) = ["C:/home", "C:/tmp"]
 splitPath( "C:/home;C:/tmp" ) = ["C:/home", "C:/tmp"]
 
```
Parameters:

path - which can contain multiple paths separated with a colon (:) or a semi-colon (;), platform independent. Could be null.

Returns:

the path splitted by colon or semi-colon or null if path was null.

Since:

2.6.1

unifyPathSeparator
```
protected static String unifyPathSeparator(String path)
```
Unify the given path with the current System path separator, to be platform independent. Examples:
```
 unifyPathSeparator( "/home:/tmp" ) = "/home:/tmp" (Solaris box)
 unifyPathSeparator( "/home:/tmp" ) = "/home;/tmp" (Windows box)
 
```
Parameters:

path - which can contain multiple paths by separating them with a colon (:) or a semi-colon (;), platform independent. Could be null.

Returns:

the same path but separated with the current System path separator or null if path was null.

Since:

2.6.1

See Also:

splitPath(String), File.pathSeparator

toRelative

public static String toRelative(File basedir,
                                String absolutePath)

isNotEmpty
```
public static boolean isNotEmpty(Collection<?> collection)
```
Convenience method to determine that a collection is not empty or null.

Parameters:

collection - the collection to verify

Returns:

true if not null and not empty, otherwise false

isEmpty
```
public static boolean isEmpty(Collection<?> collection)
```
Convenience method to determine that a collection is empty or null.

Parameters:

collection - the collection to verify

Returns:

true if null or empty, otherwise false

getRedirectUrl
```
protected static URL getRedirectUrl(URL url,
                                    org.apache.maven.settings.Settings settings)
                             throws IOException
```
Execute an HTTP request to the given URL, follow redirects, and return the last redirect location. For URLs that aren't http/https, this does nothing and simply returns the given URL unchanged.

Parameters:

url - URL

settings - Maven settings

Returns:

final URL after all redirects have been followed

Throws:

IOException - if there was an error during the HTTP request

isValidPackageList
```
protected static boolean isValidPackageList(URL url,
                                            org.apache.maven.settings.Settings settings,
                                            boolean validateContent)
                                     throws IOException
```
Validates an URL to point to a valid package-list resource.

Parameters:

url - The URL to validate.

settings - The user settings used to configure the connection to the URL or null.

validateContent - true to validate the content of the package-list resource; false to only check the existence of the package-list resource.

Returns:

true if url points to a valid package-list resource; false else.

Throws:

IOException - if reading the resource fails.

Since:

2.8

See Also:

createHttpClient(org.apache.maven.settings.Settings, java.net.URL)

isValidElementList

protected static boolean isValidElementList(URL url,
                                            org.apache.maven.settings.Settings settings,
                                            boolean validateContent)
                                     throws IOException

Throws:: IOException

Class JavadocUtil

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

DEFAULT_TIMEOUT

ERROR_INIT_VM

Constructor Detail

JavadocUtil

Method Detail

pruneDirs

pruneFiles

shouldPruneFile

getExcludedPackages

quotedArgument

quotedPathArgument

copyJavadocResources

getIncludedFiles

getExcludedPackages

getFilesFromSource

getJavadocVersion

extractJavadocVersion

parseJavadocMemory

validateEncoding

getTagletClassNames

copyResource

invokeMaven

readFile

splitPath

unifyPathSeparator

toRelative

isNotEmpty

isEmpty

getRedirectUrl

isValidPackageList

isValidElementList