org.jdom2
Class Attribute

java.lang.Object
  org.jdom2.Attribute

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, NamespaceAware

public class Attribute
extends java.lang.Object
implements NamespaceAware, java.io.Serializable, java.lang.Cloneable

An XML attribute. Methods allow the user to obtain the value of the attribute as well as namespace and type information.

Author:

Brett McLaughlin, Jason Hunter, Elliotte Rusty Harold, Wesley Biggs, Victor Toni, Rolf Lear

See Also:

Serialized Form

Field Summary

static AttributeType	CDATA_TYPE
static AttributeType	ENTITIES_TYPE
static AttributeType	ENTITY_TYPE
static AttributeType	ENUMERATED_TYPE
static AttributeType	ID_TYPE
static AttributeType	IDREF_TYPE
static AttributeType	IDREFS_TYPE
protected java.lang.String	name The local name of the Attribute
protected Namespace	namespace The Namespace of the Attribute
static AttributeType	NMTOKEN_TYPE
static AttributeType	NMTOKENS_TYPE
static AttributeType	NOTATION_TYPE
protected Element	parent The parent to which this Attribute belongs.
protected AttributeType	type The type of the Attribute
static AttributeType	UNDECLARED_TYPE
protected java.lang.String	value The value of the Attribute

Constructor Summary

protected	Attribute() Default, no-args constructor for implementations to use if needed.
	Attribute(java.lang.String name, java.lang.String value) This will create a new Attribute with the specified (local) name and value, and does not place the attribute in a Namespace.
	Attribute(java.lang.String name, java.lang.String value, AttributeType type) This will create a new Attribute with the specified (local) name, value and type, and does not place the attribute in a Namespace.
	Attribute(java.lang.String name, java.lang.String value, AttributeType type, Namespace namespace) This will create a new Attribute with the specified (local) name, value, and type, and in the provided Namespace.
	Attribute(java.lang.String name, java.lang.String value, int type) Deprecated. Use Attribute(String, String, AttributeType)
	Attribute(java.lang.String name, java.lang.String value, int type, Namespace namespace) Deprecated. Use Constructor with AttributeType type, not int type.
	Attribute(java.lang.String name, java.lang.String value, Namespace namespace) This will create a new Attribute with the specified (local) name and value, and in the provided Namespace.

Method Summary

Attribute	clone() This convenience method simply deals with the irritating CloneNotSupportedException, and wraps it in IllegalStateException.
Attribute	detach() Detach this Attribute from its parent.
AttributeType	getAttributeType() This will return the actual declared type of this Attribute.
boolean	getBooleanValue() This gets the effective boolean value of the attribute, or throws a DataConversionException if a conversion can't be performed.
Document	getDocument() Get this Attribute's Document.
double	getDoubleValue() This gets the value of the attribute, in double form, and if no conversion can occur, throws a DataConversionException
float	getFloatValue() This gets the value of the attribute, in float form, and if no conversion can occur, throws a DataConversionException
int	getIntValue() This gets the value of the attribute, in int form, and if no conversion can occur, throws a DataConversionException
long	getLongValue() This gets the value of the attribute, in long form, and if no conversion can occur, throws a DataConversionException
java.lang.String	getName() This will retrieve the local name of the Attribute.
Namespace	getNamespace() This will return this Attribute's Namespace.
java.lang.String	getNamespacePrefix() This will retrieve the namespace prefix of the Attribute.
java.util.List<Namespace>	getNamespacesInherited() Obtain a list of all namespaces that are in scope for this content, but were not introduced by this content.
java.util.List<Namespace>	getNamespacesInScope() Get the namespaces that are in-scope on this Attribute.
java.util.List<Namespace>	getNamespacesIntroduced() Obtain a list of all namespaces that are introduced to the XML tree by this node.
java.lang.String	getNamespaceURI() This returns the URI mapped to this Attribute's prefix.
Element	getParent() This will return the parent of this Attribute.
java.lang.String	getQualifiedName() This will retrieve the qualified name of the Attribute.
java.lang.String	getValue() This will return the actual textual value of this Attribute.
Attribute	setAttributeType(AttributeType type) This will set the type of the Attribute.
Attribute	setAttributeType(int type) Deprecated. use setAttributeType(AttributeType)
Attribute	setName(java.lang.String name) This sets the local name of the Attribute.
Attribute	setNamespace(Namespace namespace) This sets this Attribute's Namespace.
protected Attribute	setParent(Element parent) Set this Attribute's parent.
Attribute	setValue(java.lang.String value) This will set the value of the Attribute.
java.lang.String	toString() This returns a String representation of the Attribute, suitable for debugging.

Methods inherited from class java.lang.Object

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

Field Detail

UNDECLARED_TYPE

public static final AttributeType UNDECLARED_TYPE

See Also:

AttributeType.UNDECLARED

CDATA_TYPE

public static final AttributeType CDATA_TYPE

See Also:

AttributeType.CDATA

ID_TYPE

public static final AttributeType ID_TYPE

See Also:

AttributeType.ID

IDREF_TYPE

public static final AttributeType IDREF_TYPE

See Also:

AttributeType.IDREF

IDREFS_TYPE

public static final AttributeType IDREFS_TYPE

See Also:

AttributeType.IDREFS

ENTITY_TYPE

public static final AttributeType ENTITY_TYPE

See Also:

AttributeType.ENTITY

ENTITIES_TYPE

public static final AttributeType ENTITIES_TYPE

See Also:

AttributeType.ENTITIES

NMTOKEN_TYPE

public static final AttributeType NMTOKEN_TYPE

See Also:

AttributeType.NMTOKEN

NMTOKENS_TYPE

public static final AttributeType NMTOKENS_TYPE

See Also:

AttributeType.NMTOKENS

NOTATION_TYPE

public static final AttributeType NOTATION_TYPE

See Also:

AttributeType.NOTATION

ENUMERATED_TYPE

public static final AttributeType ENUMERATED_TYPE

See Also:

AttributeType.ENUMERATION

name

protected java.lang.String name

The local name of the Attribute

namespace

protected Namespace namespace

The Namespace of the Attribute

value

protected java.lang.String value

The value of the Attribute

type

protected AttributeType type

The type of the Attribute

parent

protected transient Element parent

The parent to which this Attribute belongs. Change it with setParent(Element)

Constructor Detail

Attribute

protected Attribute()

Default, no-args constructor for implementations to use if needed.

Attribute

public Attribute(java.lang.String name,
                 java.lang.String value,
                 Namespace namespace)

This will create a new Attribute with the specified (local) name and value, and in the provided Namespace.

Parameters:

name - String name of Attribute.

value - String value for new attribute.

namespace - Namespace namespace for new attribute.

Throws:

IllegalNameException - if the given name is illegal as an attribute name or if if the new namespace is the default namespace. Attributes cannot be in a default namespace.

IllegalDataException - if the given attribute value is illegal character data (as determined by Verifier.checkCharacterData(java.lang.String)).

Attribute

@Deprecated
public Attribute(java.lang.String name,
                            java.lang.String value,
                            int type,
                            Namespace namespace)

Deprecated. Use Constructor with AttributeType type, not int type.

This will create a new Attribute with the specified (local) name, value, and type, and in the provided Namespace.

Parameters:

name - String name of Attribute.

value - String value for new attribute.

type - int type for new attribute.

namespace - Namespace namespace for new attribute.

Throws:

IllegalNameException - if the given name is illegal as an attribute name or if if the new namespace is the default namespace. Attributes cannot be in a default namespace.

IllegalDataException - if the given attribute value is illegal character data (as determined by Verifier.checkCharacterData(java.lang.String)) or if the given attribute type is not one of the supported types.

Attribute

public Attribute(java.lang.String name,
                 java.lang.String value,
                 AttributeType type,
                 Namespace namespace)

This will create a new Attribute with the specified (local) name, value, and type, and in the provided Namespace.

Parameters:

name - String name of Attribute.

value - String value for new attribute.

type - int type for new attribute.

namespace - Namespace namespace for new attribute.

Throws:

IllegalNameException - if the given name is illegal as an attribute name or if if the new namespace is the default namespace. Attributes cannot be in a default namespace.

IllegalDataException - if the given attribute value is illegal character data (as determined by Verifier.checkCharacterData(java.lang.String)) or if the given attribute type is not one of the supported types.

Attribute

public Attribute(java.lang.String name,
                 java.lang.String value)

This will create a new Attribute with the specified (local) name and value, and does not place the attribute in a Namespace.

Note: This actually explicitly puts the Attribute in the "empty" Namespace (Namespace.NO_NAMESPACE).

Parameters:

name - String name of Attribute.

value - String value for new attribute.

Throws:

IllegalNameException - if the given name is illegal as an attribute name.

IllegalDataException - if the given attribute value is illegal character data (as determined by Verifier.checkCharacterData(java.lang.String)).

Attribute

public Attribute(java.lang.String name,
                 java.lang.String value,
                 AttributeType type)

This will create a new Attribute with the specified (local) name, value and type, and does not place the attribute in a Namespace.

Note: This actually explicitly puts the Attribute in the "empty" Namespace (Namespace.NO_NAMESPACE).

Parameters:

name - String name of Attribute.

value - String value for new attribute.

type - int type for new attribute.

Throws:

IllegalNameException - if the given name is illegal as an attribute name.

IllegalDataException - if the given attribute value is illegal character data (as determined by Verifier.checkCharacterData(java.lang.String)) or if the given attribute type is not one of the supported types.

Attribute

@Deprecated
public Attribute(java.lang.String name,
                            java.lang.String value,
                            int type)

Deprecated. Use Attribute(String, String, AttributeType)

This will create a new Attribute with the specified (local) name, value and type, and does not place the attribute in a Namespace.

Note: This actually explicitly puts the Attribute in the "empty" Namespace (Namespace.NO_NAMESPACE).

Parameters:

name - String name of Attribute.

value - String value for new attribute.

type - int type for new attribute.

Throws:

IllegalNameException - if the given name is illegal as an attribute name.

IllegalDataException - if the given attribute value is illegal character data (as determined by Verifier.checkCharacterData(java.lang.String)) or if the given attribute type is not one of the supported types.

Method Detail

getParent

public Element getParent()

This will return the parent of this Attribute. If there is no parent, then this returns null. Use return-type covariance to override Content's getParent() method to return an Element, not just a Parent

Returns:

parent of this Attribute

getDocument

public Document getDocument()

Get this Attribute's Document.

Returns:

The document to which this Attribute is associated, may be null.

getName

public java.lang.String getName()

This will retrieve the local name of the Attribute. For any XML attribute which appears as [namespacePrefix]:[attributeName], the local name of the attribute would be [attributeName]. When the attribute has no namespace, the local name is simply the attribute name.

To obtain the namespace prefix for this attribute, the getNamespacePrefix() method should be used.

Returns:

String - name of this attribute, without any namespace prefix.

setName

public Attribute setName(java.lang.String name)

This sets the local name of the Attribute.

Parameters:

name - the new local name to set

Returns:

Attribute - the attribute modified.

Throws:

IllegalNameException - if the given name is illegal as an attribute name.

getQualifiedName

public java.lang.String getQualifiedName()

This will retrieve the qualified name of the Attribute. For any XML attribute whose name is [namespacePrefix]:[elementName], the qualified name of the attribute would be everything (both namespace prefix and element name). When the attribute has no namespace, the qualified name is simply the attribute's local name.

To obtain the local name of the attribute, the getName() method should be used.

To obtain the namespace prefix for this attribute, the getNamespacePrefix() method should be used.

Returns:

String - full name for this element.

getNamespacePrefix

public java.lang.String getNamespacePrefix()

This will retrieve the namespace prefix of the Attribute. For any XML attribute which appears as [namespacePrefix]:[attributeName], the namespace prefix of the attribute would be [namespacePrefix]. When the attribute has no namespace, an empty String is returned.

Returns:

String - namespace prefix of this attribute.

getNamespaceURI

public java.lang.String getNamespaceURI()

This returns the URI mapped to this Attribute's prefix. If no mapping is found, an empty String is returned.

Returns:

String - namespace URI for this Attribute.

getNamespace

public Namespace getNamespace()

This will return this Attribute's Namespace.

Returns:

Namespace - Namespace object for this Attribute

setNamespace

public Attribute setNamespace(Namespace namespace)

This sets this Attribute's Namespace. If the provided namespace is null, the attribute will have no namespace. The namespace must have a prefix.

Parameters:

namespace - the new namespace

Returns:

Element - the element modified.

Throws:

IllegalNameException - if the new namespace is the default namespace. Attributes cannot be in a default namespace.

getValue

public java.lang.String getValue()

This will return the actual textual value of this Attribute. This will include all text within the quotation marks.

Returns:

String - value for this attribute.

setValue

public Attribute setValue(java.lang.String value)

This will set the value of the Attribute.

Parameters:

value - String value for the attribute.

Returns:

Attribute - this Attribute modified.

Throws:

IllegalDataException - if the given attribute value is illegal character data (as determined by Verifier.checkCharacterData(java.lang.String)).

getAttributeType

public AttributeType getAttributeType()

This will return the actual declared type of this Attribute.

Returns:

int - type for this attribute.

setAttributeType

public Attribute setAttributeType(AttributeType type)

This will set the type of the Attribute.

Parameters:

type - int type for the attribute.

Returns:

Attribute - this Attribute modified.

Throws:

IllegalDataException - if the given attribute type is not one of the supported types.

setAttributeType

@Deprecated
public Attribute setAttributeType(int type)

Deprecated. use setAttributeType(AttributeType)

This will set the type of the Attribute.

Parameters:

type - int type for the attribute.

Returns:

Attribute - this Attribute modified.

Throws:

IllegalDataException - if the given attribute type is not one of the supported types.

toString

public java.lang.String toString()

This returns a String representation of the Attribute, suitable for debugging.

Overrides:

toString in class java.lang.Object

Returns:

String - information about the Attribute

clone

public Attribute clone()

This convenience method simply deals with the irritating CloneNotSupportedException, and wraps it in IllegalStateException. This should never, ever, ever happen. But, it is a pain to deal with ugly clone code in some classes.

Subclasses of this should still call super.clone() in their clone method.

Additionally, when you use the concept of 'co-variant return values' you create 'bridge' methods. By way of example, because we change the return type of clone() from Object to CloneBase, Java is forced to put in a 'bridge' method that has an Object return type, even though we never actually call it.

This has an impact on the code coverage tool Cobertura, which reports that there is missed code (and there is, the bridge method). It reports it as being '0' calls to the 'class' line (the class line is marked red).

By making this CloneBase code do the first level of co-variant return, it is this class which is victim of the Cobertura reporting, not the multiple subclasses (like Attribute, Document, Content, etc.).

detach

public Attribute detach()

Detach this Attribute from its parent.

Returns:

this Attribute (detached).

setParent

protected Attribute setParent(Element parent)

Set this Attribute's parent. This is not public!

Parameters:

parent - The parent to set

Returns:

this Attribute (state may be indeterminate depending on whether this has been included in the Element's list yet).

getIntValue

public int getIntValue()
                throws DataConversionException

This gets the value of the attribute, in int form, and if no conversion can occur, throws a DataConversionException

Returns:

int value of attribute.

Throws:

DataConversionException - when conversion fails.

getLongValue

public long getLongValue()
                  throws DataConversionException

This gets the value of the attribute, in long form, and if no conversion can occur, throws a DataConversionException

Returns:

long value of attribute.

Throws:

DataConversionException - when conversion fails.

getFloatValue

public float getFloatValue()
                    throws DataConversionException

This gets the value of the attribute, in float form, and if no conversion can occur, throws a DataConversionException

Returns:

float value of attribute.

Throws:

DataConversionException - when conversion fails.

getDoubleValue

public double getDoubleValue()
                      throws DataConversionException

This gets the value of the attribute, in double form, and if no conversion can occur, throws a DataConversionException

Returns:

double value of attribute.

Throws:

DataConversionException - when conversion fails.

getBooleanValue

public boolean getBooleanValue()
                        throws DataConversionException

This gets the effective boolean value of the attribute, or throws a DataConversionException if a conversion can't be performed. True values are: "true", "on", "1", and "yes". False values are: "false", "off", "0", and "no". Values are trimmed before comparison. Values other than those listed here throw the exception.

Returns:

boolean value of attribute.

Throws:

DataConversionException - when conversion fails.

getNamespacesInScope

public java.util.List<Namespace> getNamespacesInScope()

Get the namespaces that are in-scope on this Attribute.

Attribute has peculiarities that affect the in-scope Namespaces because there are conditions in which the Attribute's scope is different to its parent Element's scope. Specifically, if the parent Element is in a 'default' Namespace that is not the empty Namespace (e.g. xmlns="someurl") and this Attribute is also in the default Namespace (has no prefix - but for Attributes that means the Namespace URL is ""), then this Attribute has a different namespace scope from it's parent Element because it does not include the 'someurl' Namespace.

In the above conditions (no-prefix Attribute in an Element with a non-empty no-prefix Namespace) this Attribute effectively re-binds the "" prefix to the "" URL, thus the Attribute 'introduces' the Namespace. It follows then that the getNamespacesIntroduced() will return a list with the single member Namespace.NO_NAMESPACE.

Note that the Attribute's Namespace will always be reported first.

Description copied from NamespaceAware.getNamespacesInScope():

Obtain a list of all namespaces that are in scope for the current content.

The contents of this list will always be the combination of getNamespacesIntroduced() and getNamespacesInherited().

See NamespaceAware documentation for details on what the order of the Namespaces will be in the returned list.

Specified by:

getNamespacesInScope in interface NamespaceAware

Returns:

a read-only list of Namespaces.

getNamespacesIntroduced

public java.util.List<Namespace> getNamespacesIntroduced()

Description copied from interface: NamespaceAware

Obtain a list of all namespaces that are introduced to the XML tree by this node. Only Elements and Attributes can introduce namespaces, so all other Content types will return an empty list.

The contents of this list will always be a subset (but in the same order) of getNamespacesInScope(), and will never intersect getNamspacesInherited()

Specified by:

getNamespacesIntroduced in interface NamespaceAware

Returns:

a read-only list of Namespaces.

getNamespacesInherited

public java.util.List<Namespace> getNamespacesInherited()

Description copied from interface: NamespaceAware

Obtain a list of all namespaces that are in scope for this content, but were not introduced by this content.

The contents of this list will always be a subset (but in the same order) of getNamespacesInScope(), and will never intersect getNamspacesIntroduced()

Specified by:

getNamespacesInherited in interface NamespaceAware

Returns:

a read-only list of Namespaces.