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java.lang.Objectjavax.servlet.jsp.tagext.TagSupport
org.springframework.web.servlet.tags.RequestContextAwareTag
org.springframework.web.servlet.tags.HtmlEscapingAwareTag
org.springframework.web.servlet.tags.form.AbstractFormTag
public abstract class AbstractFormTag
Base class for all JSP form tags. Provides utility methods for
 null-safe EL evaluation and for accessing and working with a TagWriter.
 
Subclasses should implement the writeTagContent(TagWriter) to perform
 actual tag rendering.
 
Subclasses (or test classes) can override the createTagWriter() method to
 redirect output to a Writer other than the JspWriter
 associated with the current PageContext.
| Field Summary | 
|---|
| Fields inherited from class org.springframework.web.servlet.tags.RequestContextAwareTag | 
|---|
| logger, REQUEST_CONTEXT_PAGE_ATTRIBUTE | 
| Fields inherited from class javax.servlet.jsp.tagext.TagSupport | 
|---|
| id, 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 | |
|---|---|
| AbstractFormTag() | |
| Method Summary | |
|---|---|
| protected  TagWriter | createTagWriter()Create the TagWriterwhich all output will be written to. | 
| protected  int | doStartTagInternal()Provide a simple template method that calls createTagWriter()and passes
 the createdTagWriterto thewriteTagContent(TagWriter)method. | 
| protected  Object | evaluate(String attributeName,
         Object value)Evaluate the supplied value for the supplied attribute name. | 
| protected  String | getDisplayString(Object value)Get the display value of the supplied Object, HTML escaped
 as required. | 
| protected  String | getDisplayString(Object value,
                 PropertyEditor propertyEditor)Get the display value of the supplied Object, HTML escaped
 as required. | 
| protected  boolean | isDefaultHtmlEscape()Overridden to default to truein case of no explicit default given. | 
| protected  void | writeOptionalAttribute(TagWriter tagWriter,
                       String attributeName,
                       String value)Optionally writes the supplied value under the supplied attribute name into the supplied TagWriter. | 
| protected abstract  int | writeTagContent(TagWriter tagWriter)Subclasses should implement this method to perform tag content rendering. | 
| Methods inherited from class org.springframework.web.servlet.tags.HtmlEscapingAwareTag | 
|---|
| isHtmlEscape, setHtmlEscape | 
| Methods inherited from class org.springframework.web.servlet.tags.RequestContextAwareTag | 
|---|
| doCatch, doFinally, doStartTag, getRequestContext | 
| Methods inherited from class javax.servlet.jsp.tagext.TagSupport | 
|---|
| doAfterBody, doEndTag, findAncestorWithClass, getId, getParent, getValue, getValues, release, removeValue, setId, setPageContext, setParent, setValue | 
| Methods inherited from class java.lang.Object | 
|---|
| clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait | 
| Constructor Detail | 
|---|
public AbstractFormTag()
| Method Detail | 
|---|
protected Object evaluate(String attributeName,
                          Object value)
                   throws JspException
null then null is returned, otherwise evaluation is
 handled using ExpressionEvaluationUtils.evaluate(String, String, javax.servlet.jsp.PageContext).
JspException
protected final void writeOptionalAttribute(TagWriter tagWriter,
                                            String attributeName,
                                            String value)
                                     throws JspException
TagWriter. In this case, the supplied value is evaluated first
 and then the String representation is written as the
 attribute value. If the resultant String representation is null
 or empty, no attribute is written.
JspExceptionTagWriter.writeOptionalAttributeValue(String, String)protected TagWriter createTagWriter()
TagWriter which all output will be written to. By default,
 the TagWriter writes its output to the JspWriter
 for the current PageContext. Subclasses may choose to
 change the Writer to which output is actually written.
protected final int doStartTagInternal()
                                throws Exception
createTagWriter() and passes
 the created TagWriter to the writeTagContent(TagWriter) method.
doStartTagInternal in class RequestContextAwareTagwriteTagContent(TagWriter)
Exception - any exception, any checked one other than
 a JspException gets wrapped in a JspException by doStartTagTagSupport.doStartTag()protected String getDisplayString(Object value)
Object, HTML escaped
 as required. This version is not PropertyEditor-aware.
protected String getDisplayString(Object value,
                                  PropertyEditor propertyEditor)
Object, HTML escaped
 as required. If the supplied value is not a String and the supplied
 PropertyEditor is not null then the PropertyEditor is used
 to obtain the display value.
protected boolean isDefaultHtmlEscape()
true in case of no explicit default given.
isDefaultHtmlEscape in class HtmlEscapingAwareTagRequestContextAwareTag.getRequestContext()
protected abstract int writeTagContent(TagWriter tagWriter)
                                throws JspException
Tag.doStartTag().
JspException| 
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