org.springframework.web.servlet.tags.form
Class AbstractDataBoundFormElementTag

java.lang.Object
  javax.servlet.jsp.tagext.TagSupport
      org.springframework.web.servlet.tags.RequestContextAwareTag
          org.springframework.web.servlet.tags.HtmlEscapingAwareTag
              org.springframework.web.servlet.tags.form.AbstractFormTag
                  org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag

All Implemented Interfaces:

Serializable, IterationTag, JspTag, Tag, TryCatchFinally

Direct Known Subclasses:

AbstractHtmlElementTag, HiddenInputTag

public abstract class AbstractDataBoundFormElementTag
extends AbstractFormTag

Base tag for all data-binding aware JSP form tags.

Provides the common path and id properties. Provides sub-classes with utility methods for accessing the BindStatus of their bound value and also for interacting with the TagWriter.

Since:

2.0

Author:

Rob Harrop, Juergen Hoeller

See Also:

Serialized Form

Field Summary

static String	COMMAND_NAME_ATTRIBUTE The name of the 'commandName' attribute.
static String	COMMAND_NAME_VARIABLE_NAME The name of the PageContext attribute under which the command object name is exposed.
static String	ID_ATTRIBUTE The 'id' attribute of the rendered HTML tag.

Fields inherited from class org.springframework.web.servlet.tags.RequestContextAwareTag

logger, REQUEST_CONTEXT_PAGE_ATTRIBUTE

Fields inherited from class javax.servlet.jsp.tagext.TagSupport

pageContext

Fields inherited from interface javax.servlet.jsp.tagext.IterationTag

EVAL_BODY_AGAIN

Fields inherited from interface javax.servlet.jsp.tagext.Tag

EVAL_BODY_INCLUDE, EVAL_PAGE, SKIP_BODY, SKIP_PAGE

Constructor Summary

AbstractDataBoundFormElementTag()

Method Summary

protected String	autogenerateId() Autogenerate the 'id' attribute value for this tag.
void	doFinally() Disposes of the BindStatus instance.
protected BindStatus	getBindStatus() Get the BindStatus for this tag.
protected Object	getBoundValue() Get the bound value.
protected String	getCompletePath() Build the complete path for this tag, including the nested path.
String	getId() Get the value of the 'id' attribute.
protected String	getName() Get the value for the HTML 'name' attribute.
protected String	getNestedPath() Get the value of the nested path that may have been exposed by the NestedPathTag.
protected String	getPath() Get the resolved property path for the command object.
protected PropertyEditor	getPropertyEditor() Get the PropertyEditor, if any, in use for value bound to this tag.
void	setId(String id) Set the value of the 'id' attribute.
void	setPath(String path) Set the property path from the command object.
protected void	writeDefaultAttributes(TagWriter tagWriter) Writes the default set of attributes to the supplied TagWriter.

Methods inherited from class org.springframework.web.servlet.tags.form.AbstractFormTag

createTagWriter, doStartTagInternal, evaluate, getDisplayString, getDisplayString, writeOptionalAttribute, writeTagContent

Methods inherited from class org.springframework.web.servlet.tags.HtmlEscapingAwareTag

isHtmlEscape, setHtmlEscape

Methods inherited from class org.springframework.web.servlet.tags.RequestContextAwareTag

doCatch, doStartTag, getRequestContext

Methods inherited from class javax.servlet.jsp.tagext.TagSupport

doAfterBody, doEndTag, findAncestorWithClass, getParent, getValue, getValues, release, removeValue, setPageContext, setParent, setValue

Methods inherited from class java.lang.Object

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

Field Detail

ID_ATTRIBUTE

public static final String ID_ATTRIBUTE

The 'id' attribute of the rendered HTML tag.

See Also:

Constant Field Values

COMMAND_NAME_ATTRIBUTE

public static final String COMMAND_NAME_ATTRIBUTE

The name of the 'commandName' attribute.

See Also:

Constant Field Values

COMMAND_NAME_VARIABLE_NAME

public static final String COMMAND_NAME_VARIABLE_NAME

The name of the PageContext attribute under which the command object name is exposed.

Constructor Detail

AbstractDataBoundFormElementTag

public AbstractDataBoundFormElementTag()

Method Detail

setPath

public void setPath(String path)

Set the property path from the command object. May be a runtime expression. Required.

getPath

protected final String getPath()
                        throws JspException

Get the resolved property path for the command object.

Throws:

JspException

setId

public void setId(String id)

Set the value of the 'id' attribute.

Defaults to the value of getName(); may be a runtime expression. Note that the default value may not be valid for certain tags.

Overrides:

setId in class TagSupport

getId

public String getId()

Get the value of the 'id' attribute.

May be a runtime expression.

Overrides:

getId in class TagSupport

writeDefaultAttributes

protected void writeDefaultAttributes(TagWriter tagWriter)
                               throws JspException

Writes the default set of attributes to the supplied TagWriter. Further abstract sub-classes should override this method to add in any additional default attributes but must remember to call the super method.

Concrete sub-classes should call this method when/if they want to render default attributes.

Parameters:

tagWriter - the TagWriter to which any attributes are to be written

Throws:

JspException

autogenerateId

protected String autogenerateId()
                         throws JspException

Autogenerate the 'id' attribute value for this tag.

The default implementation simply delegates to getName().

Throws:

JspException

getName

protected String getName()
                  throws JspException

Get the value for the HTML 'name' attribute.

The default implementation simply delegates to getCompletePath() to use the property path as the name. For the most part this is desirable as it links with the server-side expectation for databinding. However, some subclasses may wish to change the value of the 'name' attribute without changing the bind path.

Returns:

the value for the HTML 'name' attribute

Throws:

JspException

getBoundValue

protected final Object getBoundValue()
                              throws JspException

Get the bound value.

Throws:

JspException

See Also:

getBindStatus()

getPropertyEditor

protected PropertyEditor getPropertyEditor()
                                    throws JspException

Get the PropertyEditor, if any, in use for value bound to this tag.

Throws:

JspException

getBindStatus

protected BindStatus getBindStatus()
                            throws JspException

Get the BindStatus for this tag.

Throws:

JspException

getNestedPath

protected String getNestedPath()

Get the value of the nested path that may have been exposed by the NestedPathTag.

getCompletePath

protected String getCompletePath()
                          throws JspException

Build the complete path for this tag, including the nested path.

Throws:

JspException

See Also:

getNestedPath(), getPath()

doFinally

public void doFinally()

Disposes of the BindStatus instance.

Specified by:

doFinally in interface TryCatchFinally

Overrides:

doFinally in class RequestContextAwareTag