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Java Enterprise Edition (EE)

NumberConverter


javax.faces.convert
Class NumberConverter

java.lang.Object
  javax.faces.convert.NumberConverter
All Implemented Interfaces:
PartialStateHolder, StateHolder, Converter
public class NumberConverter
extends java.lang.Object
implements Converter, PartialStateHolder

Converter implementation for java.lang.Number values.

The getAsObject() method parses a String into an java.lang.Double or java.lang.Long, according to the following algorithm:

  • If the specified String is null, return a null. Otherwise, trim leading and trailing whitespace before proceeding.
  • If the specified String - after trimming - has a zero length, return null.
  • If the locale property is not null, use that Locale for managing parsing. Otherwise, use the Locale from the UIViewRoot.
  • If a pattern has been specified, its syntax must conform the rules specified by java.text.DecimalFormat. Such a pattern will be used to parse, and the type property will be ignored.
  • If a pattern has not been specified, parsing will be based on the type property, which expects a currency, a number, or a percent. The parse pattern for currencies, numbers, and percentages is determined by calling the getCurrencyInstance(), getNumberInstance(), or getPercentInstance() method of the java.text.NumberFormat class, passing in the selected Locale.
  • If the integerOnly property has been set to true, only the integer portion of the String will be parsed. See the JavaDocs for the setParseIntegerOnly() method of the java.text.NumberFormat class for more information.

The getAsString() method expects a value of type java.lang.Number (or a subclass), and creates a formatted String according to the following algorithm:

  • If the specified value is null, return a zero-length String.
  • If the specified value is a String, return it unmodified.
  • If the locale property is not null, use that Locale for managing formatting. Otherwise, use the Locale from the FacesContext.
  • If a pattern has been specified, its syntax must conform the rules specified by java.text.DecimalFormat. Such a pattern will be used to format, and the type property (along with related formatting options described in the next paragraph) will be ignored.
  • If a pattern has not been specified, formatting will be based on the type property, which formats the value as a currency, a number, or a percent. The format pattern for currencies, numbers, and percentages is determined by calling the percentages is determined by calling the getCurrencyInstance(), getNumberInstance(), or getPercentInstance() method of the java.text.NumberFormat class, passing in the selected Locale. In addition, the following properties will be applied to the format pattern, if specified:
    • If the groupingUsed property is true, the setGroupingUsed(true) method on the corresponding NumberFormat instance will be called.
    • The minimum and maximum number of digits in the integer and fractional portions of the result will be configured based on any values set for the maxFractionDigits, maxIntegerDigits, minFractionDigits, and minIntegerDigits properties.
    • If the type is set to currency, it is also possible to configure the currency symbol to be used, using either the currencyCode or currencySymbol properties. If both are set, the value for currencyCode takes precedence on a JDK 1.4 (or later) JVM; otherwise, the value for currencySymbol takes precedence.

Field Summary
static java.lang.String CONVERTER_ID
          The standard converter id for this converter.
static java.lang.String CURRENCY_ID
          The message identifier of the FacesMessage to be created if the conversion to Number fails.
static java.lang.String NUMBER_ID
          The message identifier of the FacesMessage to be created if the conversion to Number fails.
static java.lang.String PATTERN_ID
          The message identifier of the FacesMessage to be created if the conversion to Number fails.
static java.lang.String PERCENT_ID
          The message identifier of the FacesMessage to be created if the conversion to Number fails.
static java.lang.String STRING_ID
          The message identifier of the FacesMessage to be created if the conversion of the Number value to String fails.
 
Constructor Summary
NumberConverter()
           
 
Method Summary
 void clearInitialState()
          

Reset the PartialStateHolder to a non-delta tracking state.

 java.lang.Object getAsObject(FacesContext context, UIComponent component, java.lang.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.
 java.lang.String getAsString(FacesContext context, UIComponent component, java.lang.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.
 java.lang.String getCurrencyCode()
          Return the ISO 4217 currency code used by getAsString() with a type of currency.
 java.lang.String getCurrencySymbol()
          Return the currency symbol used by getAsString() with a type of currency.
 java.util.Locale getLocale()
          Return the Locale to be used when parsing numbers.
 int getMaxFractionDigits()
          Return the maximum number of digits getAsString() should render in the fraction portion of the result.
 int getMaxIntegerDigits()
          Return the maximum number of digits getAsString() should render in the integer portion of the result.
 int getMinFractionDigits()
          Return the minimum number of digits getAsString() should render in the fraction portion of the result.
 int getMinIntegerDigits()
          Return the minimum number of digits getAsString() should render in the integer portion of the result.
 java.lang.String getPattern()
          Return the format pattern to be used when formatting and parsing numbers.
 java.lang.String getType()
          Return the number type to be used when formatting and parsing numbers.
 boolean initialStateMarked()
          

Return true if delta state changes are being tracked, otherwise false

 boolean isGroupingUsed()
          Return true if getAsString should include grouping separators if necessary.
 boolean isIntegerOnly()
          Return true if only the integer portion of the given value should be returned from getAsObject().
 boolean isTransient()
          If true, the Object implementing this interface must not participate in state saving or restoring.
 void markInitialState()
          

The runtime must ensure that the PartialStateHolder.markInitialState() method is called on each instance of this interface in the view at the appropriate time to indicate the component is in its initial state.

 void restoreState(FacesContext context, java.lang.Object state)
           Perform any processing required to restore the state from the entries in the state Object.
 java.lang.Object saveState(FacesContext context)
           Gets the state of the instance as a Serializable Object.
 void setCurrencyCode(java.lang.String currencyCode)
          Set the ISO 4217 currency code used by getAsString() with a type of currency.
 void setCurrencySymbol(java.lang.String currencySymbol)
          Set the currency symbol used by getAsString() with a type of currency.
 void setGroupingUsed(boolean groupingUsed)
          Set the flag indicating whether getAsString() should include grouping separators if necessary.
 void setIntegerOnly(boolean integerOnly)
          Set to true if only the integer portion of the given value should be returned from getAsObject().
 void setLocale(java.util.Locale locale)
          Set the Locale to be used when parsing numbers.
 void setMaxFractionDigits(int maxFractionDigits)
          Set the maximum number of digits getAsString() should render in the fraction portion of the result.
 void setMaxIntegerDigits(int maxIntegerDigits)
          Set the maximum number of digits getAsString() should render in the integer portion of the result.
 void setMinFractionDigits(int minFractionDigits)
          Set the minimum number of digits getAsString() should render in the fraction portion of the result.
 void setMinIntegerDigits(int minIntegerDigits)
          Set the minimum number of digits getAsString() should render in the integer portion of the result.
 void setPattern(java.lang.String pattern)
          Set the format pattern to be used when formatting and parsing numbers.
 void setTransient(boolean transientFlag)
          Denotes whether or not the Object implementing this interface must or must not participate in state saving or restoring.
 void setType(java.lang.String type)
          Set the number type to be used when formatting and parsing numbers.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

CONVERTER_ID

public static final java.lang.String CONVERTER_ID

The standard converter id for this converter.

See Also:
Constant Field Values

CURRENCY_ID

public static final java.lang.String CURRENCY_ID

The message identifier of the FacesMessage to be created if the conversion to Number 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

NUMBER_ID

public static final java.lang.String NUMBER_ID

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

  • {0} replaced by the unconverted value.
  • HA
  • {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

PATTERN_ID

public static final java.lang.String PATTERN_ID

The message identifier of the FacesMessage to be created if the conversion to Number 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

PERCENT_ID

public static final java.lang.String PERCENT_ID

The message identifier of the FacesMessage to be created if the conversion to Number 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

STRING_ID

public static final java.lang.String STRING_ID

The message identifier of the FacesMessage to be created if the conversion of the Number 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

NumberConverter

public NumberConverter()
Method Detail

getCurrencyCode

public java.lang.String getCurrencyCode()

Return the ISO 4217 currency code used by getAsString() with a type of currency. If not set, the value used will be based on the formatting Locale.

setCurrencyCode

public void setCurrencyCode(java.lang.String currencyCode)

Set the ISO 4217 currency code used by getAsString() with a type of currency.

Parameters:
currencyCode - The new currency code

getCurrencySymbol

public java.lang.String getCurrencySymbol()

Return the currency symbol used by getAsString() with a type of currency. If not set, the value used will be based on the formatting Locale.

setCurrencySymbol

public void setCurrencySymbol(java.lang.String currencySymbol)

Set the currency symbol used by getAsString() with a type of currency.

Parameters:
currencySymbol - The new currency symbol

isGroupingUsed

public boolean isGroupingUsed()

Return true if getAsString should include grouping separators if necessary. If not modified, the default value is true.

setGroupingUsed

public void setGroupingUsed(boolean groupingUsed)

Set the flag indicating whether getAsString() should include grouping separators if necessary.

Parameters:
groupingUsed - The new grouping used flag

isIntegerOnly

public boolean isIntegerOnly()

Return true if only the integer portion of the given value should be returned from getAsObject(). If not modified, the default value is false.

setIntegerOnly

public void setIntegerOnly(boolean integerOnly)

Set to true if only the integer portion of the given value should be returned from getAsObject().

Parameters:
integerOnly - The new integer-only flag

getMaxFractionDigits

public int getMaxFractionDigits()

Return the maximum number of digits getAsString() should render in the fraction portion of the result.

setMaxFractionDigits

public void setMaxFractionDigits(int maxFractionDigits)

Set the maximum number of digits getAsString() should render in the fraction portion of the result. If not set, the number of digits depends on the value being converted.

Parameters:
maxFractionDigits - The new limit

getMaxIntegerDigits

public int getMaxIntegerDigits()

Return the maximum number of digits getAsString() should render in the integer portion of the result.

setMaxIntegerDigits

public void setMaxIntegerDigits(int maxIntegerDigits)

Set the maximum number of digits getAsString() should render in the integer portion of the result. If not set, the number of digits depends on the value being converted.

Parameters:
maxIntegerDigits - The new limit

getMinFractionDigits

public int getMinFractionDigits()

Return the minimum number of digits getAsString() should render in the fraction portion of the result.

setMinFractionDigits

public void setMinFractionDigits(int minFractionDigits)

Set the minimum number of digits getAsString() should render in the fraction portion of the result. If not set, the number of digits depends on the value being converted.

Parameters:
minFractionDigits - The new limit

getMinIntegerDigits

public int getMinIntegerDigits()

Return the minimum number of digits getAsString() should render in the integer portion of the result.

setMinIntegerDigits

public void setMinIntegerDigits(int minIntegerDigits)

Set the minimum number of digits getAsString() should render in the integer portion of the result. If not set, the number of digits depends on the value being converted.

Parameters:
minIntegerDigits - The new limit

getLocale

public java.util.Locale getLocale()

Return the Locale to be used when parsing numbers. If this value is null, the Locale stored in the UIViewRoot for the current request will be utilized.

setLocale

public void setLocale(java.util.Locale locale)

Set the Locale to be used when parsing numbers. If set to null, the Locale stored in the UIViewRoot for the current request will be utilized.

Parameters:
locale - The new Locale (or null)

getPattern

public java.lang.String getPattern()

Return the format pattern to be used when formatting and parsing numbers.

setPattern

public void setPattern(java.lang.String pattern)

Set the format pattern to be used when formatting and parsing numbers. Valid values are those supported by java.text.DecimalFormat. An invalid value will cause a ConverterException when getAsObject() or getAsString() is called.

Parameters:
pattern - The new format pattern

getType

public java.lang.String getType()

Return the number type to be used when formatting and parsing numbers. If not modified, the default type is number.

setType

public void setType(java.lang.String type)

Set the number type to be used when formatting and parsing numbers. Valid values are currency, number, or percent. An invalid value will cause a ConverterException when getAsObject() or getAsString() is called.

Parameters:
type - The new number style

getAsObject

public java.lang.Object getAsObject(FacesContext context,
                                    UIComponent component,
                                    java.lang.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
java.lang.NullPointerException - if context or component is null

getAsString

public java.lang.String getAsString(FacesContext context,
                                    UIComponent component,
                                    java.lang.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
java.lang.NullPointerException - if context or component is null

saveState

public java.lang.Object saveState(FacesContext context)
Description copied from interface: StateHolder

Gets the state of the instance as a Serializable Object.

If the class that implements this interface has references to instances that implement StateHolder (such as a UIComponent with event handlers, validators, etc.) this method must call the StateHolder.saveState(javax.faces.context.FacesContext) method on all those instances as well. This method must not save the state of children and facets. That is done via the StateManager

This method must not alter the state of the implementing object. In other words, after executing this code:

 Object state = component.saveState(facesContext);
 

component should be the same as before executing it.

The return from this method must be Serializable

Specified by:
saveState in interface StateHolder

restoreState

public void restoreState(FacesContext context,
                         java.lang.Object state)
Description copied from interface: StateHolder

Perform any processing required to restore the state from the entries in the state Object.

If the class that implements this interface has references to instances that also implement StateHolder (such as a UIComponent with event handlers, validators, etc.) this method must call the StateHolder.restoreState(javax.faces.context.FacesContext, java.lang.Object) method on all those instances as well.

Specified by:
restoreState in interface StateHolder

isTransient

public boolean isTransient()
Description copied from interface: StateHolder

If true, the Object implementing this interface must not participate in state saving or restoring.

Specified by:
isTransient in interface StateHolder

setTransient

public void setTransient(boolean transientFlag)
Description copied from interface: StateHolder

Denotes whether or not the Object implementing this interface must or must not participate in state saving or restoring.

Specified by:
setTransient in interface StateHolder
Parameters:
transientFlag - boolean pass true if this Object will participate in state saving or restoring, otherwise pass false.

markInitialState

public void markInitialState()
Description copied from interface: PartialStateHolder

The runtime must ensure that the PartialStateHolder.markInitialState() method is called on each instance of this interface in the view at the appropriate time to indicate the component is in its initial state. The implementor of the interface must ensure that PartialStateHolder.initialStateMarked() returns true from the time markInitialState() is called until PartialStateHolder.clearInitialState() is called, after which time initialStateMarked() must return false. Also, during the time that the instance returns true from initialStateMarked(), the implementation must return only the state that has changed in its implementation of StateHolder#saveState.

Specified by:
markInitialState in interface PartialStateHolder

initialStateMarked

public boolean initialStateMarked()
Description copied from interface: PartialStateHolder

Return true if delta state changes are being tracked, otherwise false

Specified by:
initialStateMarked in interface PartialStateHolder

clearInitialState

public void clearInitialState()
Description copied from interface: PartialStateHolder

Reset the PartialStateHolder to a non-delta tracking state.

Specified by:
clearInitialState in interface PartialStateHolder


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