com.unboundid.util

Class CommandLineTool

java.lang.Object

com.unboundid.util.CommandLineTool

Direct Known Subclasses:

Base64Tool, GenerateSchemaFromSource, IndentLDAPFilter, InMemoryDirectoryServerTool, LDAPCommandLineTool, LDAPResultCode, LDIFDiff, LDIFModify, LDIFSearch, ManageCertificates, MultiServerLDAPCommandLineTool, OIDLookup, SplitLDIF, SummarizeAccessLog, TestLDAPSDKPerformance, TLSCipherSuiteSelector, TransformLDIF, ValidateLDAPSchema

@Extensible
@ThreadSafety(level=INTERFACE_NOT_THREADSAFE)
public abstract class CommandLineTool
extends java.lang.Object

This class provides a framework for developing command-line tools that use the argument parser provided as part of the UnboundID LDAP SDK for Java. This tool adds a "-H" or "--help" option, which can be used to display usage information for the program, and may also add a "-V" or "--version" option, which can display the tool version.

Subclasses should include their own main method that creates an instance of a CommandLineTool and should invoke the runTool(java.lang.String...) method with the provided arguments. For example:

   public class ExampleCommandLineTool
          extends CommandLineTool
   {
     public static void main(String[] args)
     {
       ExampleCommandLineTool tool = new ExampleCommandLineTool();
       ResultCode resultCode = tool.runTool(args);
       if (resultCode != ResultCode.SUCCESS)
       {
         System.exit(resultCode.intValue());
       }
     }

     public ExampleCommandLineTool()
     {
       super(System.out, System.err);
     }

     // The rest of the tool implementation goes here.
     ...
   }
 

.

Note that in general, methods in this class are not threadsafe. However, the out(Object...) and err(Object...) methods may be invoked concurrently by any number of threads.

Constructor Summary

Constructors

Constructor and Description
CommandLineTool(java.io.OutputStream outStream, java.io.OutputStream errStream) Creates a new instance of this command-line tool with the provided information.

Method Summary

Methods

Modifier and Type	Method and Description
protected void	addEnableSSLDebuggingArgument(BooleanArgument enableSSLDebuggingArgument) Adds the provided argument to the set of arguments that may be used to enable JVM SSL/TLS debugging.
abstract void	addToolArguments(ArgumentParser parser) Adds the command-line arguments supported for use with this tool to the provided argument parser.
ArgumentParser	createArgumentParser() Creates a parser that can be used to to parse arguments accepted by this tool.
boolean	defaultsToInteractiveMode() Indicates whether this tool defaults to launching in interactive mode if the tool is invoked without any command-line arguments.
void	doExtendedArgumentValidation() Performs any necessary processing that should be done to ensure that the provided set of command-line arguments were valid.
protected void	doShutdownHookProcessing(ResultCode resultCode) Performs any processing that may be needed when the JVM is shutting down, whether because tool processing has completed or because it has been interrupted (e.g., by a kill or break signal).
abstract ResultCode	doToolProcessing() Performs the core set of processing for this tool.
void	err(java.lang.Object... msg) Writes the provided message to the standard error stream for this tool.
java.util.List<java.lang.String>	getAdditionalDescriptionParagraphs() Retrieves additional paragraphs that should be included in the description for this tool.
java.io.PrintStream	getErr() Retrieves the print stream that will be used for standard error.
java.util.LinkedHashMap<java.lang.String[],java.lang.String>	getExampleUsages() Retrieves a set of information that may be used to generate example usage information.
int	getMaxTrailingArguments() Retrieves the maximum number of unnamed trailing arguments that may be provided for this tool.
int	getMinTrailingArguments() Retrieves the minimum number of unnamed trailing arguments that must be provided for this tool.
java.io.PrintStream	getOriginalErr() Retrieves the print stream that may be used to write to the original standard error.
java.io.PrintStream	getOriginalOut() Retrieves the print stream that may be used to write to the original standard output.
java.io.PrintStream	getOut() Retrieves the print stream that will be used for standard output.
PasswordFileReader	getPasswordFileReader() Retrieves the password file reader for this tool, which may be used to read passwords from (optionally compressed and encrypted) files.
protected java.lang.String	getToolCompletionMessage() Retrieves an optional message that may provide additional information about the way that the tool completed its processing.
abstract java.lang.String	getToolDescription() Retrieves a human-readable description for this tool.
abstract java.lang.String	getToolName() Retrieves the name of this tool.
java.lang.String	getToolVersion() Retrieves a version string for this tool, if available.
java.lang.String	getTrailingArgumentsPlaceholder() Retrieves a placeholder string that should be used for trailing arguments in the usage information for this tool.
protected boolean	logToolInvocationByDefault() Indicates whether to log messages about the launch and completion of this tool into the invocation log of Ping Identity server products that may include it.
void	out(java.lang.Object... msg) Writes the provided message to the standard output stream for this tool.
protected boolean	registerShutdownHook() Indicates whether this tool should register a shutdown hook with the JVM.
protected java.util.List<java.lang.String>	requestToolArgumentsInteractively(ArgumentParser parser) Interactively prompts the user for information needed to invoke this tool and returns an appropriate list of arguments that should be used to run it.
ResultCode	runTool(java.lang.String... args) Performs all processing for this command-line tool.
boolean	supportsInteractiveMode() Indicates whether this tool should provide support for an interactive mode, in which the tool offers a mode in which the arguments can be provided in a text-driven menu rather than requiring them to be given on the command line.
protected boolean	supportsOutputFile() Indicates whether this tool should provide arguments for redirecting output to a file.
boolean	supportsPropertiesFile() Indicates whether this tool supports the use of a properties file for specifying default values for arguments that aren't specified on the command line.
void	wrapErr(int indent, int wrapColumn, java.lang.Object... msg) Writes the provided message to the standard error stream for this tool, optionally wrapping and/or indenting the text in the process.
void	wrapOut(int indent, int wrapColumn, java.lang.Object... msg) Writes the provided message to the standard output stream for this tool, optionally wrapping and/or indenting the text in the process.

Methods inherited from class java.lang.Object

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

Constructor Detail

CommandLineTool

public CommandLineTool(@Nullable
               java.io.OutputStream outStream,
               @Nullable
               java.io.OutputStream errStream)

Creates a new instance of this command-line tool with the provided information.

Parameters:

outStream - The output stream to use for standard output. It may be System.out for the JVM's default standard output stream, null if no output should be generated, or a custom output stream if the output should be sent to an alternate location.

errStream - The output stream to use for standard error. It may be System.err for the JVM's default standard error stream, null if no output should be generated, or a custom output stream if the output should be sent to an alternate location.

Method Detail

runTool

@NotNull
public final ResultCode runTool(@Nullable
                         java.lang.String... args)

Performs all processing for this command-line tool. This includes:

• Creating the argument parser and populating it using the addToolArguments(com.unboundid.util.args.ArgumentParser) method.
• Parsing the provided set of command line arguments, including any additional validation using the doExtendedArgumentValidation() method.
• Invoking the doToolProcessing() method to do the appropriate work for this tool.

Parameters:

args - The command-line arguments provided to this program.

Returns:

The result of processing this tool. It should be ResultCode.SUCCESS if the tool completed its work successfully, or some other result if a problem occurred.

getToolName

@NotNull
public abstract java.lang.String getToolName()

Retrieves the name of this tool. It should be the name of the command used to invoke this tool.

Returns:

The name for this tool.

getToolDescription

@Nullable
public abstract java.lang.String getToolDescription()

Retrieves a human-readable description for this tool. If the description should include multiple paragraphs, then this method should return the text for the first paragraph, and the getAdditionalDescriptionParagraphs() method should be used to return the text for the subsequent paragraphs.

Returns:

A human-readable description for this tool.

getAdditionalDescriptionParagraphs

@Nullable
public java.util.List<java.lang.String> getAdditionalDescriptionParagraphs()

Retrieves additional paragraphs that should be included in the description for this tool. If the tool description should include multiple paragraphs, then the getToolDescription() method should return the text of the first paragraph, and each item in the list returned by this method should be the text for each subsequent paragraph. If the tool description should only have a single paragraph, then this method may return null or an empty list.

Returns:

Additional paragraphs that should be included in the description for this tool, or null or an empty list if only a single description paragraph (whose text is returned by the getToolDescription method) is needed.

getToolVersion

@Nullable
public java.lang.String getToolVersion()

Retrieves a version string for this tool, if available.

Returns:

A version string for this tool, or null if none is available.

getMinTrailingArguments

public int getMinTrailingArguments()

Retrieves the minimum number of unnamed trailing arguments that must be provided for this tool. If a tool requires the use of trailing arguments, then it must override this method and the getMaxTrailingArguments() arguments to return nonzero values, and it must also override the getTrailingArgumentsPlaceholder() method to return a non-null value.

Returns:

The minimum number of unnamed trailing arguments that may be provided for this tool. A value of zero indicates that the tool may be invoked without any trailing arguments.

getMaxTrailingArguments

public int getMaxTrailingArguments()

Retrieves the maximum number of unnamed trailing arguments that may be provided for this tool. If a tool supports trailing arguments, then it must override this method to return a nonzero value, and must also override the getTrailingArgumentsPlaceholder() method to return a non-null value.

Returns:

The maximum number of unnamed trailing arguments that may be provided for this tool. A value of zero indicates that trailing arguments are not allowed. A negative value indicates that there should be no limit on the number of trailing arguments.

getTrailingArgumentsPlaceholder

@Nullable
public java.lang.String getTrailingArgumentsPlaceholder()

Retrieves a placeholder string that should be used for trailing arguments in the usage information for this tool.

Returns:

A placeholder string that should be used for trailing arguments in the usage information for this tool, or null if trailing arguments are not supported.

supportsInteractiveMode

public boolean supportsInteractiveMode()

Indicates whether this tool should provide support for an interactive mode, in which the tool offers a mode in which the arguments can be provided in a text-driven menu rather than requiring them to be given on the command line. If interactive mode is supported, it may be invoked using the "--interactive" argument. Alternately, if interactive mode is supported and defaultsToInteractiveMode() returns true, then interactive mode may be invoked by simply launching the tool without any arguments.

Returns:

true if this tool supports interactive mode, or false if not.

defaultsToInteractiveMode

public boolean defaultsToInteractiveMode()

Indicates whether this tool defaults to launching in interactive mode if the tool is invoked without any command-line arguments. This will only be used if supportsInteractiveMode() returns true.

Returns:

true if this tool defaults to using interactive mode if launched without any command-line arguments, or false if not.

requestToolArgumentsInteractively

@Nullable
protected java.util.List<java.lang.String> requestToolArgumentsInteractively(@NotNull
                                                                          ArgumentParser parser)
                                                                      throws LDAPException

Interactively prompts the user for information needed to invoke this tool and returns an appropriate list of arguments that should be used to run it.

This method will only be invoked if supportsInteractiveMode() returns true, and if one of the following conditions is satisfied:

• The --interactive argument is explicitly provided on the command line.
• The tool was invoked without any command-line arguments and defaultsToInteractiveMode() returns true.

If this method is invoked and returns null, then the LDAP SDK's default interactive mode processing will be performed. Otherwise, the tool will be invoked with only the arguments in the list that is returned.

Parameters:

parser - The argument parser that has been used to parse any command-line arguments that were provided before the interactive mode processing was invoked. If this method returns a non-null value, then this parser will be reset before parsing the new set of arguments.

Returns:

Retrieves a list of command-line arguments that may be used to invoke this tool, or null if the LDAP SDK's default interactive mode processing should be performed.

Throws:

LDAPException - If a problem is encountered while interactively obtaining the arguments that should be used to run the tool.

supportsPropertiesFile

public boolean supportsPropertiesFile()

Indicates whether this tool supports the use of a properties file for specifying default values for arguments that aren't specified on the command line.

Returns:

true if this tool supports the use of a properties file for specifying default values for arguments that aren't specified on the command line, or false if not.

supportsOutputFile

protected boolean supportsOutputFile()

Indicates whether this tool should provide arguments for redirecting output to a file. If this method returns true, then the tool will offer an "--outputFile" argument that will specify the path to a file to which all standard output and standard error content will be written, and it will also offer a "--teeToStandardOut" argument that can only be used if the "--outputFile" argument is present and will cause all output to be written to both the specified output file and to standard output.

Returns:

true if this tool should provide arguments for redirecting output to a file, or false if not.

logToolInvocationByDefault

protected boolean logToolInvocationByDefault()

Indicates whether to log messages about the launch and completion of this tool into the invocation log of Ping Identity server products that may include it. This method is not needed for tools that are not expected to be part of the Ping Identity server products suite. Further, this value may be overridden by settings in the server's tool-invocation-logging.properties file.

This method should generally return true for tools that may alter the server configuration, data, or other state information, and false for tools that do not make any changes.

Returns:

true if Ping Identity server products should include messages about the launch and completion of this tool in tool invocation log files by default, or false if not.

getToolCompletionMessage

@Nullable
protected java.lang.String getToolCompletionMessage()

Retrieves an optional message that may provide additional information about the way that the tool completed its processing. For example if the tool exited with an error message, it may be useful for this method to return that error message.

The message returned by this method is intended for informational purposes and is not meant to be parsed or programmatically interpreted.

Returns:

An optional message that may provide additional information about the completion state for this tool, or null if no completion message is available.

createArgumentParser

@NotNull
public final ArgumentParser createArgumentParser()
                                          throws ArgumentException

Creates a parser that can be used to to parse arguments accepted by this tool.

Returns:

ArgumentParser that can be used to parse arguments for this tool.

Throws:

ArgumentException - If there was a problem initializing the parser for this tool.

addEnableSSLDebuggingArgument

protected void addEnableSSLDebuggingArgument(@NotNull
                                 BooleanArgument enableSSLDebuggingArgument)

Adds the provided argument to the set of arguments that may be used to enable JVM SSL/TLS debugging.

Parameters:

enableSSLDebuggingArgument - The argument to add to the set of arguments that may be used to enable JVM SSL/TLS debugging.

addToolArguments

public abstract void addToolArguments(@NotNull
                    ArgumentParser parser)
                               throws ArgumentException

Adds the command-line arguments supported for use with this tool to the provided argument parser. The tool may need to retain references to the arguments (and/or the argument parser, if trailing arguments are allowed) to it in order to obtain their values for use in later processing.

Parameters:

parser - The argument parser to which the arguments are to be added.

Throws:

ArgumentException - If a problem occurs while adding any of the tool-specific arguments to the provided argument parser.

doExtendedArgumentValidation

public void doExtendedArgumentValidation()
                                  throws ArgumentException

Performs any necessary processing that should be done to ensure that the provided set of command-line arguments were valid. This method will be called after the basic argument parsing has been performed and immediately before the doToolProcessing() method is invoked. Note that if the tool supports interactive mode, then this method may be invoked multiple times to allow the user to interactively fix validation errors.

Throws:

ArgumentException - If there was a problem with the command-line arguments provided to this program.

doToolProcessing

@NotNull
public abstract ResultCode doToolProcessing()

Performs the core set of processing for this tool.

Returns:

A result code that indicates whether the processing completed successfully.

registerShutdownHook

protected boolean registerShutdownHook()

Indicates whether this tool should register a shutdown hook with the JVM. Shutdown hooks allow for a best-effort attempt to perform a specified set of processing when the JVM is shutting down under various conditions, including:

• When all non-daemon threads have stopped running (i.e., the tool has completed processing).
• When System.exit() or Runtime.exit() is called.
• When the JVM receives an external kill signal (e.g., via the use of the kill tool or interrupting the JVM with Ctrl+C).

Shutdown hooks may not be invoked if the process is forcefully killed (e.g., using "kill -9", or the System.halt() or Runtime.halt() methods).

If this method is overridden to return true, then the doShutdownHookProcessing(ResultCode) method should also be overridden to contain the logic that will be invoked when the JVM is shutting down in a manner that calls shutdown hooks.

Returns:

true if this tool should register a shutdown hook, or false if not.

doShutdownHookProcessing

protected void doShutdownHookProcessing(@Nullable
                            ResultCode resultCode)

Performs any processing that may be needed when the JVM is shutting down, whether because tool processing has completed or because it has been interrupted (e.g., by a kill or break signal).

Note that because shutdown hooks run at a delicate time in the life of the JVM, they should complete quickly and minimize access to external resources. See the documentation for the java.lang.Runtime.addShutdownHook method for recommendations and restrictions about writing shutdown hooks.

Parameters:

resultCode - The result code returned by the tool. It may be null if the tool was interrupted before it completed processing.

getExampleUsages

@ThreadSafety(level=METHOD_THREADSAFE)
@Nullable
public java.util.LinkedHashMap<java.lang.String[],java.lang.String> getExampleUsages()

Retrieves a set of information that may be used to generate example usage information. Each element in the returned map should consist of a map between an example set of arguments and a string that describes the behavior of the tool when invoked with that set of arguments.

Returns:

A set of information that may be used to generate example usage information. It may be null or empty if no example usage information is available.

getPasswordFileReader

@NotNull
public final PasswordFileReader getPasswordFileReader()

Retrieves the password file reader for this tool, which may be used to read passwords from (optionally compressed and encrypted) files.

Returns:

The password file reader for this tool.

getOut

@NotNull
public final java.io.PrintStream getOut()

Retrieves the print stream that will be used for standard output.

Returns:

The print stream that will be used for standard output.

getOriginalOut

@NotNull
public final java.io.PrintStream getOriginalOut()

Retrieves the print stream that may be used to write to the original standard output. This may be different from the current standard output stream if an output file has been configured.

Returns:

The print stream that may be used to write to the original standard output.

out

@ThreadSafety(level=METHOD_THREADSAFE)
public final void out(@NotNull
                                          java.lang.Object... msg)

Writes the provided message to the standard output stream for this tool.

This method is completely threadsafe and my be invoked concurrently by any number of threads.

Parameters:

msg - The message components that will be written to the standard output stream. They will be concatenated together on the same line, and that line will be followed by an end-of-line sequence.

wrapOut

@ThreadSafety(level=METHOD_THREADSAFE)
public final void wrapOut(int indent,
                                              int wrapColumn,
                                              @NotNull
                                              java.lang.Object... msg)

Writes the provided message to the standard output stream for this tool, optionally wrapping and/or indenting the text in the process.

This method is completely threadsafe and my be invoked concurrently by any number of threads.

Parameters:

indent - The number of spaces each line should be indented. A value less than or equal to zero indicates that no indent should be used.

wrapColumn - The column at which to wrap long lines. A value less than or equal to two indicates that no wrapping should be performed. If both an indent and a wrap column are to be used, then the wrap column must be greater than the indent.

msg - The message components that will be written to the standard output stream. They will be concatenated together on the same line, and that line will be followed by an end-of-line sequence.

getErr

@NotNull
public final java.io.PrintStream getErr()

Retrieves the print stream that will be used for standard error.

Returns:

The print stream that will be used for standard error.

getOriginalErr

@NotNull
public final java.io.PrintStream getOriginalErr()

Retrieves the print stream that may be used to write to the original standard error. This may be different from the current standard error stream if an output file has been configured.

Returns:

The print stream that may be used to write to the original standard error.

err

@ThreadSafety(level=METHOD_THREADSAFE)
public final void err(@NotNull
                                          java.lang.Object... msg)

Writes the provided message to the standard error stream for this tool.

This method is completely threadsafe and my be invoked concurrently by any number of threads.

Parameters:

msg - The message components that will be written to the standard error stream. They will be concatenated together on the same line, and that line will be followed by an end-of-line sequence.

wrapErr

@ThreadSafety(level=METHOD_THREADSAFE)
public final void wrapErr(int indent,
                                              int wrapColumn,
                                              @NotNull
                                              java.lang.Object... msg)

Writes the provided message to the standard error stream for this tool, optionally wrapping and/or indenting the text in the process.

This method is completely threadsafe and my be invoked concurrently by any number of threads.

Parameters:

indent - The number of spaces each line should be indented. A value less than or equal to zero indicates that no indent should be used.

wrapColumn - The column at which to wrap long lines. A value less than or equal to two indicates that no wrapping should be performed. If both an indent and a wrap column are to be used, then the wrap column must be greater than the indent.

msg - The message components that will be written to the standard output stream. They will be concatenated together on the same line, and that line will be followed by an end-of-line sequence.