org.crsh.shell.impl.command
Class InvocationContextImpl<P>

java.lang.Object
  org.crsh.shell.impl.command.InvocationContextImpl<P>

All Implemented Interfaces:

Closeable, Flushable, CommandContext<P>, InvocationContext<P>, RuntimeContext, Consumer<P>, InteractionContext, ScreenContext

public final class InvocationContextImpl<P>
extends Object
implements InvocationContext<P>

Field Summary

private static int	CLOSED .
private CommandContext<P>	commandContext .
private static int	FLUSHED .
(package private) int	status .
private RenderPrintWriter	writer .
private static int	WRITTEN .

Constructor Summary

InvocationContextImpl(CommandContext<P> commandContext)

Method Summary

void	close()
void	flush()
Map<String,Object>	getAttributes() Returns the current attributes.
Class<P>	getConsumedType() Returns the class of the element generic type.
int	getHeight() Returns the screen height in chars.
String	getProperty(String propertyName) Returns a generic property, usually this property is resolved by the shell client.
Map<String,Object>	getSession() Returns the current session.
int	getWidth() Returns the screen width in chars.
RenderPrintWriter	getWriter() Returns the writer for the output.
boolean	isPiped()
InvocationContextImpl<P>	leftShift(Object o)
void	provide(P element) Provide an element.
String	readLine(String msg, boolean echo) Display a message and read a line on the console, this method call can be blocking until the user provides a value.
boolean	releaseAlternateBuffer() Release control of the alternate buffer.
CommandInvoker<?,?>	resolve(String s) Resolve a command invoker for the specified command line.
boolean	takeAlternateBuffer() Take control of the alternate buffer.
void	write(Chunk chunk) Write a chunk to the screen.

Methods inherited from class java.lang.Object

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

Field Detail

WRITTEN

private static final int WRITTEN

.

See Also:

Constant Field Values

FLUSHED

private static final int FLUSHED

.

See Also:

Constant Field Values

CLOSED

private static final int CLOSED

.

See Also:

Constant Field Values

commandContext

private final CommandContext<P> commandContext

.

writer

private RenderPrintWriter writer

.

status

int status

.

Constructor Detail

InvocationContextImpl

public InvocationContextImpl(CommandContext<P> commandContext)

Method Detail

isPiped

public boolean isPiped()

Specified by:

isPiped in interface CommandContext<P>

getWriter

public RenderPrintWriter getWriter()

Description copied from interface: InvocationContext

Returns the writer for the output.

Specified by:

getWriter in interface InvocationContext<P>

Returns:

the writer

takeAlternateBuffer

public boolean takeAlternateBuffer()
                            throws IOException

Description copied from interface: InteractionContext

Take control of the alternate buffer. When the alternate buffer is already used nothing happens. The buffer switch should occur when then Flushable.flush() method is invoked.

Specified by:

takeAlternateBuffer in interface InteractionContext

Returns:

true if the alternate buffer is shown

Throws:

IOException

releaseAlternateBuffer

public boolean releaseAlternateBuffer()
                               throws IOException

Description copied from interface: InteractionContext

Release control of the alternate buffer. When the normal buffer is already used nothing happens. The buffer switch should occur when then Flushable.flush() method is invoked.

Specified by:

releaseAlternateBuffer in interface InteractionContext

Returns:

true if the usual buffer is shown

Throws:

IOException

resolve

public CommandInvoker<?,?> resolve(String s)
                            throws ScriptException,
                                   IOException

Description copied from interface: InvocationContext

Resolve a command invoker for the specified command line.

Specified by:

resolve in interface InvocationContext<P>

Parameters:

s - the command line

Returns:

the command invoker

Throws:

ScriptException - any script exception

IOException - any io exception

getConsumedType

public Class<P> getConsumedType()

Description copied from interface: Consumer

Returns the class of the element generic type.

Specified by:

getConsumedType in interface Consumer<P>

Returns:

the consumed type

getProperty

public String getProperty(String propertyName)

Description copied from interface: InteractionContext

Returns a generic property, usually this property is resolved by the shell client.

Specified by:

getProperty in interface InteractionContext

Parameters:

propertyName - the property name

Returns:

the property value

readLine

public String readLine(String msg,
                       boolean echo)
                throws IOException,
                       InterruptedException

Description copied from interface: InteractionContext

Display a message and read a line on the console, this method call can be blocking until the user provides a value. If no line can be read then null is returned.

Specified by:

readLine in interface InteractionContext

Parameters:

msg - the message to display before reading a line

echo - wether or not the line read should be echoed when typing

Returns:

the line read

Throws:

IOException - any io exception

InterruptedException - the thread was interrupted while waiting for the user value

getWidth

public int getWidth()

Description copied from interface: ScreenContext

Returns the screen width in chars. When the value is not positive it means the value could not be determined.

Specified by:

getWidth in interface ScreenContext

Returns:

the term width

getHeight

public int getHeight()

Description copied from interface: ScreenContext

Returns the screen height in chars. When the value is not positive it means the value could not be determined.

Specified by:

getHeight in interface ScreenContext

Returns:

the term height

write

public void write(Chunk chunk)
           throws IOException

Description copied from interface: ScreenContext

Write a chunk to the screen.

Specified by:

write in interface ScreenContext

Parameters:

chunk - the chunk

Throws:

IOException - any io exception

provide

public void provide(P element)
             throws IOException

Description copied from interface: Consumer

Provide an element.

Specified by:

provide in interface Consumer<P>

Parameters:

element - the provided element

Throws:

IOException

flush

public void flush()
           throws IOException

Specified by:

flush in interface Flushable

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Throws:

IOException

getSession

public Map<String,Object> getSession()

Description copied from interface: RuntimeContext

Returns the current session.

Specified by:

getSession in interface RuntimeContext

Returns:

the session map

getAttributes

public Map<String,Object> getAttributes()

Description copied from interface: RuntimeContext

Returns the current attributes.

Specified by:

getAttributes in interface RuntimeContext

Returns:

the attributes map

leftShift

public InvocationContextImpl<P> leftShift(Object o)
                                   throws IOException

Throws:

IOException