TagData (Java EE 5 SDK)

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Java EE 5 SDK

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摘要: 嵌套 | 字段 | 构造器 | 方法

详细信息: 字段 | 构造器 | 方法

javax.servlet.jsp.tagext Class TagData

java.lang.Object
  javax.servlet.jsp.tagext.TagData

所有已实现的接口:: Cloneable

public class TagData
extends Object
implements Cloneable

The (translation-time only) attribute/value information for a tag instance.

TagData is only used as an argument to the isValid, validate, and getVariableInfo methods of TagExtraInfo, which are invoked at translation time.

字段摘要
`static Object`	`REQUEST_TIME_VALUE` Distinguished value for an attribute to indicate its value is a request-time expression (which is not yet available because TagData instances are used at translation-time).

构造器摘要
`TagData(Hashtable<String,Object> attrs)` Constructor for a TagData.
`TagData(Object[][] atts)` Constructor for TagData.

方法摘要
`Object`	`getAttribute(String attName)` The value of the attribute.
`Enumeration<String>`	`getAttributes()` Enumerates the attributes.
`String`	`getAttributeString(String attName)` Get the value for a given attribute.
`String`	`getId()` The value of the tag's id attribute.
`void`	`setAttribute(String attName, Object value)` Set the value of an attribute.

类方法继承 java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

字段详细信息

REQUEST_TIME_VALUE

public static final Object REQUEST_TIME_VALUE

Distinguished value for an attribute to indicate its value is a request-time expression (which is not yet available because TagData instances are used at translation-time).

构造器详细信息

TagData

public TagData(Object[][] atts)

Constructor for TagData.

A typical constructor may be

 static final Object[][] att = {{"connection", "conn0"}, {"id", "query0"}};
 static final TagData td = new TagData(att);

All values must be Strings except for those holding the distinguished object REQUEST_TIME_VALUE.

参数:: atts - the static attribute and values. May be null.

TagData

public TagData(Hashtable<String,Object> attrs)

Constructor for a TagData. If you already have the attributes in a hashtable, use this constructor.

参数:: attrs - A hashtable to get the values from.

方法详细信息

getId

public String getId()

The value of the tag's id attribute.

返回:: the value of the tag's id attribute, or null if no such attribute was specified.

getAttribute

public Object getAttribute(String attName)

The value of the attribute. If a static value is specified for an attribute that accepts a request-time attribute expression then that static value is returned, even if the value is provided in the body of a <jsp:attribute> action. The distinguished object REQUEST_TIME_VALUE is only returned if the value is specified as a request-time attribute expression or via the <jsp:attribute> action with a body that contains dynamic content (scriptlets, scripting expressions, EL expressions, standard actions, or custom actions). Returns null if the attribute is not set.

参数:: attName - the name of the attribute
返回:: the attribute's value

setAttribute

public void setAttribute(String attName,
                         Object value)

Set the value of an attribute.

参数:: attName - the name of the attribute; value - the value.

getAttributeString

public String getAttributeString(String attName)

Get the value for a given attribute.

参数:: attName - the name of the attribute
返回:: the attribute value string
抛出异常:: ClassCastException - if attribute value is not a String

getAttributes

public Enumeration<String> getAttributes()

Enumerates the attributes.

返回:: An enumeration of the attributes in a TagData

概述