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, EditorAwareTag

Direct Known Subclasses:

AbstractHtmlElementTag

public abstract class AbstractDataBoundFormElementTag
extends AbstractFormTag
implements EditorAwareTag

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

Fields

Modifier and Type	Field and Description
protected static String	NESTED_PATH_VARIABLE_NAME Name of the exposed path variable within the scope of this tag: "nestedPath".

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

Constructors

Constructor and Description
AbstractDataBoundFormElementTag()

Method Summary

Modifier and Type	Method and Description
protected String	autogenerateId() Autogenerate the 'id' attribute value for this tag.
protected String	convertToDisplayString(Object value) Get a display String for the given value, converted by a PropertyEditor that the BindStatus may have registered for the value's Class.
void	doFinally() Disposes of the BindStatus instance.
protected BindStatus	getBindStatus() Get the BindStatus for this tag.
protected Object	getBoundValue() Get the bound value.
PropertyEditor	getEditor() Exposes the PropertyEditor for EditorAwareTag.
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 form object.
protected PropertyEditor	getPropertyEditor() Get the PropertyEditor, if any, in use for value bound to this tag.
protected String	getPropertyPath() Build the property path for this tag, including the nested path but not prefixed with the name of the form attribute.
protected String	processFieldValue(String name, String value, String type) Process the given form field through a RequestDataValueProcessor instance if one is configured or otherwise returns the same value.
protected String	resolveId() Determine the 'id' attribute value for this tag, autogenerating one if none specified.
void	setId(String id) Set the value of the 'id' attribute.
void	setPath(String path) Set the property path from the form 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, isDefaultHtmlEscape, writeOptionalAttribute, writeTagContent

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

htmlEscape, isHtmlEscape, isResponseEncodedHtmlEscape, 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

NESTED_PATH_VARIABLE_NAME

protected static final String NESTED_PATH_VARIABLE_NAME

Name of the exposed path variable within the scope of this tag: "nestedPath". Same value as NestedPathTag.NESTED_PATH_VARIABLE_NAME.

See Also:

Constant Field Values

Constructor Detail

AbstractDataBoundFormElementTag

public AbstractDataBoundFormElementTag()

Method Detail

setPath

public void setPath(String path)

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

getPath

protected final String getPath()
                        throws JspException

Get the resolved property path for the form object.

Throws:

JspException

setId

public void setId(@Nullable
                  String id)

Set the value of the 'id' attribute.

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

Overrides:

setId in class TagSupport

getId

@Nullable
public String getId()

Get the value of the 'id' attribute.

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

resolveId

@Nullable
protected String resolveId()
                              throws JspException

Determine the 'id' attribute value for this tag, autogenerating one if none specified.

Throws:

JspException

See Also:

getId(), autogenerateId()

autogenerateId

@Nullable
protected String autogenerateId()
                                   throws JspException

Autogenerate the 'id' attribute value for this tag.

The default implementation simply delegates to getName(), deleting invalid characters (such as "[" or "]").

Throws:

JspException

getName

@Nullable
protected String getName()
                            throws JspException

Get the value for the HTML 'name' attribute.

The default implementation simply delegates to getPropertyPath() to use the property path as the name. For the most part this is desirable as it links with the server-side expectation for data binding. 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

getBindStatus

protected BindStatus getBindStatus()
                            throws JspException

Get the BindStatus for this tag.

Throws:

JspException

getNestedPath

@Nullable
protected String getNestedPath()

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

getPropertyPath

protected String getPropertyPath()
                          throws JspException

Build the property path for this tag, including the nested path but not prefixed with the name of the form attribute.

Throws:

JspException

See Also:

getNestedPath(), getPath()

getBoundValue

@Nullable
protected final Object getBoundValue()
                                        throws JspException

Get the bound value.

Throws:

JspException

See Also:

getBindStatus()

getPropertyEditor

@Nullable
protected PropertyEditor getPropertyEditor()
                                              throws JspException

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

Throws:

JspException

getEditor

@Nullable
public final PropertyEditor getEditor()
                                         throws JspException

Exposes the PropertyEditor for EditorAwareTag.

Use getPropertyEditor() for internal rendering purposes.

Specified by:

getEditor in interface EditorAwareTag

Returns:

the current PropertyEditor, or null if none

Throws:

JspException - if resolving the editor failed

convertToDisplayString

protected String convertToDisplayString(@Nullable
                                        Object value)
                                 throws JspException

Get a display String for the given value, converted by a PropertyEditor that the BindStatus may have registered for the value's Class.

Throws:

JspException

processFieldValue

protected final String processFieldValue(@Nullable
                                         String name,
                                         String value,
                                         String type)

Process the given form field through a RequestDataValueProcessor instance if one is configured or otherwise returns the same value.

doFinally

public void doFinally()

Disposes of the BindStatus instance.

Specified by:

doFinally in interface TryCatchFinally

Overrides:

doFinally in class RequestContextAwareTag