viper.descriptors.attributes
Class Attributes

java.lang.Object
  viper.descriptors.attributes.Attributes

public class Attributes

extends java.lang.Object

Some static methods for dealing with Viper Attributes.

Field Summary

static java.lang.String	DEFAULT_NAMESPACE_QUALIFIER The default namespace qualifier to use with viper data.
static java.lang.String	DEFAULT_NAMESPACE_URI The viper data URI

Constructor Summary

Attributes()

Method Summary

static void	addAttributeType(java.lang.String name, java.lang.Class type)
static java.lang.Class	getClassForAttribute(java.lang.String type)
static boolean	isComposable(java.lang.String type) Tests to see if the given attribute type is composible.
static boolean	isGoodValue(Attribute type, java.lang.String value) Tests to see if the string represents a possible value of the given attribute type.
static boolean	isType(java.lang.String type) Determines if the specified string is a possible Attribute data type.
static java.lang.Object	parseValue(Attribute type, java.lang.Object value) Converts from a String into the internal data type used by the attribute.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DEFAULT_NAMESPACE_URI

public static final java.lang.String DEFAULT_NAMESPACE_URI

The viper data URI

See Also:

Constant Field Values

DEFAULT_NAMESPACE_QUALIFIER

public static final java.lang.String DEFAULT_NAMESPACE_QUALIFIER

The default namespace qualifier to use with viper data. This is important, as xml parsers that don't understand namespaces may be looking for this as part of the element name.

See Also:

Constant Field Values

Constructor Detail

Attributes

public Attributes()

Method Detail

addAttributeType

public static void addAttributeType(java.lang.String name,
                                    java.lang.Class type)

Parameters:

name -

type -

getClassForAttribute

public static java.lang.Class getClassForAttribute(java.lang.String type)

Parameters:

type -

Returns:

Throws:

java.lang.IllegalArgumentException - If the given type isn't registered.

isComposable

public static boolean isComposable(java.lang.String type)

Tests to see if the given attribute type is composible.

Parameters:

type - the type of attribute to check

Returns:

false if it is not composable.

Throws:

java.lang.UnsupportedOperationException - if the type is improperly defined

java.lang.IllegalStateException - if the isComposable method of the type throws an exception.

isType

public static boolean isType(java.lang.String type)

Determines if the specified string is a possible Attribute data type.

Parameters:

type - The string to be tested.

Returns:

true if the string is a proper data type

isGoodValue

public static boolean isGoodValue(Attribute type,
                                  java.lang.String value)

Tests to see if the string represents a possible value of the given attribute type. Depends on the Attribute.possibleValueOf(String) method.

Parameters:

type - the attribute to check

value - the value to check

Returns:

false if it is a bad value or an unknown type.

Throws:

java.lang.UnsupportedOperationException - if possibleValueOf is not defined for the given type

java.lang.IllegalStateException - if the possibleValueOf method of the type throws an exception.

parseValue

public static java.lang.Object parseValue(Attribute type,
                                          java.lang.Object value)

Converts from a String into the internal data type used by the attribute. This works by invoking the appropriate Attribute class's "parseValue" command.

Parameters:

type - The attribute to test against.

value - The data to test. A String in the old format, or a org.w3c.dom.Element in the new format.

Returns:

a internal object

Throws:

java.lang.UnsupportedOperationException - if parseValue is not defined for the given attribute or value type

java.lang.IllegalStateException - if the parseValue method of the type throws an exception.