javax.servlet.jsp.tagext

Class BodyContent

java.lang.Object

java.io.Writer

javax.servlet.jsp.JspWriter

javax.servlet.jsp.tagext.BodyContent

All Implemented Interfaces:

Closeable, Flushable, Appendable, AutoCloseable

public abstract class BodyContent
extends JspWriter

An encapsulation of the evaluation of the body of an action so it is available to a tag handler. BodyContent is a subclass of JspWriter.

Note that the content of BodyContent is the result of evaluation, so it will not contain actions and the like, but the result of their invocation.

BodyContent has methods to convert its contents into a String, to read its contents, and to clear the contents.

The buffer size of a BodyContent object is unbounded. A BodyContent object cannot be in autoFlush mode. It is not possible to invoke flush on a BodyContent object, as there is no backing stream.

Instances of BodyContent are created by invoking the pushBody and popBody methods of the PageContext class. A BodyContent is enclosed within another JspWriter (maybe another BodyContent object) following the structure of their associated actions.

A BodyContent is made available to a BodyTag through a setBodyContent() call. The tag handler can use the object until after the call to doEndTag().

Field Summary

Fields inherited from class javax.servlet.jsp.JspWriter

autoFlush, bufferSize, DEFAULT_BUFFER, NO_BUFFER, UNBOUNDED_BUFFER

Fields inherited from class java.io.Writer

lock

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	BodyContent(JspWriter e) Protected constructor.

Method Summary

Modifier and Type	Method and Description
void	clearBody() Clear the body without throwing any exceptions.
void	flush() Redefined flush() so it is not legal.
JspWriter	getEnclosingWriter() Get the enclosing JspWriter.
abstract Reader	getReader() Return the value of this BodyContent as a Reader.
abstract String	getString() Return the value of the BodyContent as a String.
abstract void	writeOut(Writer out) Write the contents of this BodyContent into a Writer.

Methods inherited from class javax.servlet.jsp.JspWriter

clear, clearBuffer, close, getBufferSize, getRemaining, isAutoFlush, newLine, print, print, print, print, print, print, print, print, print, println, println, println, println, println, println, println, println, println, println

Methods inherited from class java.io.Writer

append, append, append, write, write, write, write, write

Methods inherited from class java.lang.Object

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

Constructor Detail

BodyContent

protected BodyContent(JspWriter e)

Protected constructor. Unbounded buffer, no autoflushing.

Parameters:

e - the enclosing JspWriter

Method Detail

flush

public void flush()
           throws IOException

Redefined flush() so it is not legal.

It is not valid to flush a BodyContent because there is no backing stream behind it.

Specified by:

flush in interface Flushable

Specified by:

flush in class JspWriter

Throws:

IOException - always thrown

clearBody

public void clearBody()

Clear the body without throwing any exceptions.

getReader

public abstract Reader getReader()

Return the value of this BodyContent as a Reader.

Returns:

the value of this BodyContent as a Reader

getString

public abstract String getString()

Return the value of the BodyContent as a String.

Returns:

the value of the BodyContent as a String

writeOut

public abstract void writeOut(Writer out)
                       throws IOException

Write the contents of this BodyContent into a Writer. Subclasses may optimize common invocation patterns.

Parameters:

out - The writer into which to place the contents of this body evaluation

Throws:

IOException - if an I/O error occurred while writing the contents of this BodyContent to the given Writer

getEnclosingWriter

public JspWriter getEnclosingWriter()

Get the enclosing JspWriter.

Returns:

the enclosing JspWriter passed at construction time