org.crsh.shell.impl.command
Class Pipe<C,P>

java.lang.Object
  org.crsh.shell.impl.command.Pipe<C,P>

All Implemented Interfaces:

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

Direct Known Subclasses:

Pipe.Chunkizer, Pipe.Invoker, Pipe.Sink

abstract class Pipe<C,P>
extends Object
implements Filter<C,P,InteractionContext<P>>, InteractionContext<C>

Author:

Julien Viet

Nested Class Summary

(package private) static class	Pipe.Chunkizer
(package private) static class	Pipe.Invoker<C,P> A pipe filter that invokes a command through a CommandInvoker.
(package private) static class	Pipe.Sink<P>

Field Summary

protected InteractionContext<P>

context .

Constructor Summary

Pipe()

Method Summary

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.
int	getWidth() Returns the screen width in chars.
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.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.crsh.io.Producer

close, getProducedType, open, setPiped

Methods inherited from interface org.crsh.io.Consumer

getConsumedType, provide

Methods inherited from interface java.io.Flushable

flush

Field Detail

context

protected InteractionContext<P> context

.

Constructor Detail

Pipe

Pipe()

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<C>

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<C>

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<C>

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<C>

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<C>

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<C>

Returns:

the term height