LongConverter (Java EE 5)

Java EE API

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javax.faces.convert Class LongConverter

java.lang.Object
  extended by javax.faces.convert.LongConverter
All Implemented Interfaces:
Converter
public class LongConverter
extends Object
implements Converter

Implements: Converter

java.lang.Long（以及 long 基本类型）值的 Converter 实现。

英文文档：

Converter implementation for java.lang.Long (and long primitive) values.

Field Summary
static String CONVERTER_ID
          The standard converter id for this converter.
static String LONG_ID
          The message identifier of the FacesMessage to be created if the conversion to Long fails.
static String STRING_ID
          The message identifier of the FacesMessage to be created if the conversion of the Long value to String fails.
 
Constructor Summary
LongConverter()
           
 
Method Summary
 Object getAsObject(FacesContext context, UIComponent component, String value)
          Convert the specified string value, which is associated with the specified UIComponent, into a model data object that is appropriate for being stored during the Apply Request Values phase of the request processing lifecycle.
 String getAsString(FacesContext context, UIComponent component, Object value)
          Convert the specified model object value, which is associated with the specified UIComponent, into a String that is suitable for being included in the response generated during the Render Response phase of the request processing lifeycle.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

英文文档：

CONVERTER_ID 

public static final String CONVERTER_ID

The standard converter id for this converter.

See Also:
Constant Field Values

英文文档：

LONG_ID 

public static final String LONG_ID

The message identifier of the FacesMessage to be created if the conversion to Long fails. The message format string for this message may optionally include the following placeholders:

  • {0} replaced by the unconverted value.
  • {1} replaced by an example value.
  • {2} replaced by a String whose value is the label of the input component that produced this message.

See Also:
Constant Field Values

英文文档：

STRING_ID 

public static final String STRING_ID

The message identifier of the FacesMessage to be created if the conversion of the Long value to String fails. The message format string for this message may optionally include the following placeholders:

  • {0} relaced by the unconverted value.
  • {1} replaced by a String whose value is the label of the input component that produced this message.

See Also:
Constant Field Values

Constructor Detail

public LongConverter()
英文文档：

LongConverter

public LongConverter()
Method Detail

public Object getAsObject(FacesContext context, UIComponent component, String value)
ThrowsConverterException: NullPointerException 如果无法成功执行转换
ThrowsNullPointerException: NullPointerException 如果 context 或 component 为 null
英文文档：

getAsObject

public Object getAsObject(FacesContext context,
                          UIComponent component,
                          String value)
Description copied from interface: Converter

Convert the specified string value, which is associated with the specified UIComponent, into a model data object that is appropriate for being stored during the Apply Request Values phase of the request processing lifecycle.

Specified by:
getAsObject in interface Converter
Parameters:
context - FacesContext for the request being processed
component - UIComponent with which this model object value is associated
value - String value to be converted (may be null)
Returns:
null if the value to convert is null, otherwise the result of the conversion
Throws:
ConverterException - if conversion cannot be successfully performed
NullPointerException - if context or component is null

public String getAsString(FacesContext context, UIComponent component, Object value)
ThrowsConverterException: NullPointerException 如果无法成功执行转换
ThrowsNullPointerException: NullPointerException 如果 context 或 component 为 null
英文文档：

getAsString

public String getAsString(FacesContext context,
                          UIComponent component,
                          Object value)
Description copied from interface: Converter

Convert the specified model object value, which is associated with the specified UIComponent, into a String that is suitable for being included in the response generated during the Render Response phase of the request processing lifeycle.

Specified by:
getAsString in interface Converter
Parameters:
context - FacesContext for the request being processed
component - UIComponent with which this model object value is associated
value - Model object value to be converted (may be null)
Returns:
a zero-length String if value is null, otherwise the result of the conversion
Throws:
ConverterException - if conversion cannot be successfully performed
NullPointerException - if context or component is null
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Copyright 2007 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.

一看就知道只有菜鸟才干这么无知的事啦。

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