org.springframework.web.servlet.tags.form

Class TagWriter

java.lang.Object

org.springframework.web.servlet.tags.form.TagWriter

public class TagWriter
extends java.lang.Object

Utility class for writing HTML content to a Writer instance.

Intended to support output from JSP tag libraries.

Since:

2.0

Author:

Rob Harrop, Juergen Hoeller

Constructor Summary

Constructors

Constructor and Description
TagWriter(PageContext pageContext) Create a new instance of the TagWriter class that writes to the supplied PageContext.
TagWriter(java.io.Writer writer) Create a new instance of the TagWriter class that writes to the supplied Writer.

Method Summary

Modifier and Type	Method and Description
void	appendValue(java.lang.String value) Close the current opening tag (if necessary) and appends the supplied value as inner text.
void	endTag() Close the current tag.
void	endTag(boolean enforceClosingTag) Close the current tag, allowing to enforce a full closing tag.
void	forceBlock() Indicate that the currently open tag should be closed and marked as a block level element.
void	startTag(java.lang.String tagName) Start a new tag with the supplied name.
void	writeAttribute(java.lang.String attributeName, java.lang.String attributeValue) Write an HTML attribute with the specified name and value.
void	writeOptionalAttributeValue(java.lang.String attributeName, java.lang.String attributeValue) Write an HTML attribute if the supplied value is not null or zero length.

Methods inherited from class java.lang.Object

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

Constructor Detail

TagWriter

public TagWriter(PageContext pageContext)

Create a new instance of the TagWriter class that writes to the supplied PageContext.

Parameters:

pageContext - the JSP PageContext to obtain the Writer from

TagWriter

public TagWriter(java.io.Writer writer)

Create a new instance of the TagWriter class that writes to the supplied Writer.

Parameters:

writer - the Writer to write tag content to

Method Detail

startTag

public void startTag(java.lang.String tagName)
              throws JspException

Start a new tag with the supplied name. Leaves the tag open so that attributes, inner text or nested tags can be written into it.

Throws:

JspException

See Also:

endTag()

writeAttribute

public void writeAttribute(java.lang.String attributeName,
                           java.lang.String attributeValue)
                    throws JspException

Write an HTML attribute with the specified name and value.

Be sure to write all attributes before writing any inner text or nested tags.

Throws:

java.lang.IllegalStateException - if the opening tag is closed

JspException

writeOptionalAttributeValue

public void writeOptionalAttributeValue(java.lang.String attributeName,
                                        java.lang.String attributeValue)
                                 throws JspException

Write an HTML attribute if the supplied value is not null or zero length.

Throws:

JspException

See Also:

writeAttribute(String, String)

appendValue

public void appendValue(java.lang.String value)
                 throws JspException

Close the current opening tag (if necessary) and appends the supplied value as inner text.

Throws:

java.lang.IllegalStateException - if no tag is open

JspException

forceBlock

public void forceBlock()
                throws JspException

Indicate that the currently open tag should be closed and marked as a block level element.

Useful when you plan to write additional content in the body outside the context of the current TagWriter.

Throws:

JspException

endTag

public void endTag()
            throws JspException

Close the current tag.

Correctly writes an empty tag if no inner text or nested tags have been written.

Throws:

JspException

endTag

public void endTag(boolean enforceClosingTag)
            throws JspException

Close the current tag, allowing to enforce a full closing tag.

Correctly writes an empty tag if no inner text or nested tags have been written.

Parameters:

enforceClosingTag - whether a full closing tag should be rendered in any case, even in case of a non-block tag

Throws:

JspException