org.crsh.command.pipeline
Class PipeLineElement<C,P>

java.lang.Object
  org.crsh.command.pipeline.PipeLineElement<C,P>

All Implemented Interfaces:

Closeable, Flushable, CommandContext<C>, RuntimeContext, Consumer<C>, Filter<C,P,CommandContext<P>>, Producer<P,CommandContext<P>>, InteractionContext, ScreenContext

 class PipeLineElement<C,P>
extends Object
implements Filter<C,P,CommandContext<P>>, CommandContext<C>

Author:

Julien Viet

Field Summary

(package private) Filter<C,P,CommandContext<P>>	command .
(package private) Class<C>	consumedType .
protected CommandContext<P>	context .

Constructor Summary

PipeLineElement(Filter<C,P,CommandContext<P>> command)

Method Summary

void	close() Close the producer.
void	flush()
Map<String,Object>	getAttributes() Returns the current attributes.
Class<C>	getConsumedType() Returns the class of the element generic type.
int	getHeight() Returns the screen height in chars.
Class<P>	getProducedType() Returns the class of the produced type.
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.
boolean	isPiped()
void	open(CommandContext<P> consumer) Open the producer with the specified consumer.
void	provide(C element) Provide an element.
String	readLine(String msg, boolean echo) Display a message and read a line on the console.
boolean	releaseAlternateBuffer() Release control of the alternate buffer.
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

context

protected CommandContext<P> context

.

command

final Filter<C,P,CommandContext<P>> command

.

consumedType

final Class<C> consumedType

.

Constructor Detail

PipeLineElement

PipeLineElement(Filter<C,P,CommandContext<P>> command)

Method Detail

takeAlternateBuffer

public final 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 final 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

getProperty

public final 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 final String readLine(String msg,
                             boolean echo)

Description copied from interface: InteractionContext

Display a message and read a line on the console. 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

getWidth

public final 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 final 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

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

isPiped

public boolean isPiped()

Specified by:

isPiped in interface CommandContext<C>

getProducedType

public Class<P> getProducedType()

Description copied from interface: Producer

Returns the class of the produced type.

Specified by:

getProducedType in interface Producer<P,CommandContext<P>>

Returns:

the produced type

getConsumedType

public Class<C> getConsumedType()

Description copied from interface: Consumer

Returns the class of the element generic type.

Specified by:

getConsumedType in interface Consumer<C>

Returns:

the consumed type

open

public void open(CommandContext<P> consumer)

Description copied from interface: Producer

Open the producer with the specified consumer.

Specified by:

open in interface Producer<P,CommandContext<P>>

Parameters:

consumer - the consumer

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(C element)
             throws IOException

Description copied from interface: Consumer

Provide an element.

Specified by:

provide in interface Consumer<C>

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 ScriptException,
                  IOException

Description copied from interface: Producer

Close the producer.

Specified by:

close in interface Closeable

Specified by:

close in interface Producer<P,CommandContext<P>>

Throws:

IOException - any io exception

ScriptException