itextsharp barcode example vb.net The Standard Converters in Java

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TABLE 7-1 The Standard Converters
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Converts Values of Type javamathBigDecimal javamathBigInteger javalangBoolean boolean javalangBytebyte javalangCharacterchar javautilDate javasqlDate javalangDoubledouble javalangFloatfloat javalangIntegerint javalangLonglong javalangNumber (for currencies, percentages, and so on) javalangShortshor
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Converter ID javaxfacesBigDecimal javaxfacesBigInteger javaxfacesBoolean javaxfacesByte javaxfacesCharacter javaxfacesDateTime javaxfacesDouble javaxfacesFloat javaxfacesInteger javaxfacesLong javaxfacesNumber javaxfacesShort
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7:
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C o n v e r t i n g a n d Va l i d a t i n g D a t a
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sections These two converters have several JavaBeans properties that control the conversion process When using Faces with JSP, the setters for these properties are called by the JSP tag that represents the converter in the page
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PART I PART I PART I
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DateTimeConverter
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The getAsObject( ) method parses a String into a javautilDate using an algorithm similar to the following: 1 Examine the argument string If null, return null; otherwise, call trim( ) on the argument If the string ends up being zero length after trimming, return null 2 Use the Locale JavaBeans property of this Converter instance, if non-null Otherwise, if Locale is null, use the one from the UIViewRoot for this view This Locale will inform the rest of the processing for this method call 3 If a pattern JavaBeans property is specified on this converter instance (by virtue of the converter s setPattern( ) method being called), it must conform to the rules of javatextSimpleDateFormat The pattern property takes precedence over the type, dateStyle, and timeStyle JavaBeans properties 4 If pattern is not specified, parsing takes place based on the value of the type property, which must be date, time, or both
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E XPERT GROUP I NSIGHT Parsing is non-lenient! The given string must conform exactly to the
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formatting parameters Failure to conform causes a conversion error The Expert Group decided that the original implementation of lenient parsing in the SimpleDateFormat class of the JDK was incorrect and inconsistently implemented across Java platform vendors In addition, the socalled leniency isn t really lenient in any useful way Thus, the decision was made to disallow the use of lenient parsing in JSF The getAsString( ) method converts the model tier Object to a String for rendering using an algorithm very similar to the one described earlier, except that a null model tier value is converted to a zero length String
NumberConverter
The getAsObject( ) method parses a String into a javalangNumber subclass using an algorithm that is the equivalent of the following: 1 Examine the argument string If null, return null; otherwise, call trim( ) on the argument string If the string ends up being zero length after trimming, return null 2 Use the Locale property of this Converter instance, if non-null Otherwise, if Locale is null, use the one from the UIViewRoot for this view This Locale will inform the rest of the processing for this method call 3 If a pattern JavaBeans property is specified (by virtue of the setPattern( ) being called), it must conform to the rules of javatextDecimalFormat The pattern property takes precedence over the type property 4 If a pattern JavaBeans property is not specified, parsing takes place based on the value of the type property, which must be number, percentage, or currency 5 If the integerOnly property is set to true, only the integer part of the String is parsed
Part I:
The JavaServer Faces Framework
The getAsString( ) method converts the model tier Object to a String for rendering using an algorithm very similar to the one described earlier, except that a null model tier value is converted to a zero length string, and the groupingUsed, maxFractionDigits, maxIntegerDigits, currencyCode, and currencySymbol properties are applied before formatting
Associating a Converter with a UIComponent Instance
As described in the previous section, each UIOutput instance in the view may have zero or one Converter associated with it There are several ways to make that association, and we ll cover each in this section Since Faces was designed with ease of development in mind, most users will not need to manually associate a converter with a component instance due to the comprehensive list of standard converters that automatically are associated with the component depending on its current value We call these implicit converters In addition to the implicit converter association, there are a number of ways a converter can manually be associated with a component instance: by using one of the standard JSP converter tags, by using a custom converter tag, or programmatically in Java code by calling setConverter( ) on the component instance
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